Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| evaluation of interspecific hybrids of the chicken, guinea fowl, and japanese quail for innate resistance to coccidia. | experimental chicken/guinea fowl hybrids, guinea fowl, and chickens were orally inoculated with eimeria acervulina or e. tenella, which are specific for chickens, or with e. grenieri, which is specific for guinea fowl. no intact oocysts were found in feces within 24 hr of inoculation, suggesting that excystation occurred in the normal and abnormal hosts. no oocysts were found in the feces of hybrids during a 9-day postinoculation period. the guinea fowl passed oocysts of guinea fowl coccidia (e. ... | 1987 | 3442527 |
| evaluation of the efficacy of maduramacin ammonium in combination with roxarsone and avoparcin in caged broiler chickens. | 1. the anticoccidial activity of maduramicin ammonium (5 mg/kg food) administered alone or with roxarsone (50 mg/kg food) and/or avoparcin (10 mg/kg food) was evaluated in battery-reared broilers artificially challenged with recent field culture mixtures containing eimeria acervulina, e. maxima and e. tenella or e. mivati, e. necatrix and e. brunetti. 2. maduramicin ammonium exhibited a high degree of anticoccidial activity and the addition of roxarsone and/or avoparcin in food at recommended co ... | 1988 | 3409087 |
| role of compensatory gain in eimeria acervulina-induced liver copper accumulation in chicks. | an investigation was conducted to determine whether the eimeria acervulina-induced increase in liver cu accumulation in chicks is the result of compensatory gain that accompanies the recovery phase of infection. in experiment 1, chicks inoculated one time with 1 x 10(6) sporulated e. acervulina oocysts had a faster rate of compensatory gain than chicks inoculated serially on three occasions with 4 x 10(5) oocysts. however, liver cu accumulation was nearly identical for the two infection regimes. ... | 1988 | 3392597 |
| eimeria acervulina: evaluation of the cellular and antibody responses to the recombinant coccidial antigens in b-congenic chickens. | the roles of major histocompatibility complex (mhc) and non-mhc-linked genes in the genetic control of disease susceptibility and the development of protective immunity to eimeria acervulina infection were investigated in six 15i5-b congenic and four different strains of chickens characterized for the mhc. when oocyst production was assessed, wide variations were noted following initial and challenge infections among the strains of chickens tested. in general, 15.n-21, 15.p-13, b21, b19, sc, and ... | 1988 | 3263928 |
| influence of coccidiosis on growth rate and feed conversion in broilers after experimental infections with eimeria acervulina and eimeria maxima. | under experimental conditions, the effects of subclinical eimeria (e.) acervulina and e. maxima infections on growth and feed conversion in broilers of different ages were analysed. it was concluded that infection with e. acervulina and e. maxima led to a process which was independent of the age at which the birds were infected. the infection adversely affected growth and feed conversion for 2 to 3 weeks, followed by a recovery period of 2 to 3 weeks when compensatory growth took place. from thi ... | 1988 | 3218068 |
| the effect of eimeria acervulina infection on plasma lipids and lipoproteins in young broiler chicks. | in young broiler chicks inoculated with 2 x 10(6) sporulated oocysts of eimeria acervulina per bird, total plasma lipids were significantly depressed compared with controls in the first week after inoculation. the lowest level observed was at 5 days post-inoculation (d.p.i.), at which time the chick host is known to experience malabsorption in the chick host (ruff and wilkins, 1980). analysis of plasma components of infected chicks at 4 and 7 d.p.i. showed that triglycerides, total cholesterol, ... | 1988 | 3212927 |
| [analysis of losses due to subclinical small intestinal coccidiosis caused by eimeria acervulina and eimeria maxima under field conditions]. | subclinical coccidiosis of broiler chickens caused by eimeria (e.) acervulina and e. maxima results in a negative effect on feed conversion and retardation of growth. in the present report investigations in 80 broiler flocks are described in which the relationship between age of infection and economic effects were analysed under field conditions. under these conditions, infections with e. acervulina and e. maxima were found to have a negative effect on growth and feed conversion, that this negat ... | 1988 | 3176009 |
| lysine and sulfur amino acid utilization in eimeria acervulina-infected chicks as affected by narasin. | the effects of supplemental narasin (80 mg/kg) on several dietary factors were investigated in chicks infected with eimeria acervulina. in trial 1, chicks were fed a lysine-deficient corn-corn gluten meal diet containing graded increments of crystalline l-lysine.hcl with or without narasin. supplemental narasin increased weight gain and feed efficiency at all lysine levels fed. based upon slope-ratio methodology, efficiency of l-lysine utilization was virtually the same in both narasin-fed and c ... | 1987 | 3124089 |
| concurrent infections with reoviruses and coccidia in broilers. | these experiments investigated the interaction among two species of coccidia (eimeria acervulina and e. mitis) and three strains of reovirus (virus 2035, a weak to moderate pathogen; and viruses 2408 and 1733, severe pathogens). when reoviruses were not present, high inoculation dosages (10(6) sporulated oocysts/bird) of both e. acervulina and e. mitis depressed weight gain, plasma pigment, and plasma protein. low doses of coccidia (10(4) oocysts) in the absence of virus had no such effect on we ... | 1985 | 2992439 |
| cdna encoding an immunogenic region of a 22 kilodalton surface protein of eimeria acervulina sporozoites. | cdna encoding an immunogenic region of a 22 kda surface protein of eimeria acervulina sporozoites was cloned and expressed in the bacteriophage lambda gt11 vector. the recombinant beta-galactosidase fusion protein, designated ma1, has an apparent molecular size of 125 kda. immunofluorescence staining of intact e. acervulina sporozoites and merozoites and immunoblotting of 125i-surface labeled protein from both stages revealed exclusive expression of the cloned cdna in the sporozoite stage. the g ... | 1989 | 2927444 |
| etiology and pathogenesis of necrotic enteritis. | sporulated oocysts of eimeria acervulina were administered orally to cage-housed broilers at a dose of 3.5 x 10(5) resulted in mild subclinical coccidiosis. clostridium perfringens incorporated in feed at a level of 2.5 x 10(8) organisms/g. produced lesions characteristic of necrotic enteritis. mortality of 8% (7/80) occurred in birds fed a ration inoculated with cl. perfringens alone. mortality of 35% (28/80) was observed in birds which received an oral dose of e. acervulina and which were fed ... | 1985 | 2869608 |
| eimeria acervulina: dna cloning and characterization of recombinant sporozoite and merozoite antigens. | genes encoding antigens of eimeria acervulina were cloned from cdna expression libraries prepared from the sporozoite and merozoite stages in order to examine humoral and cellular immune responses to this protozoan parasite. two clones expressing surface antigens were characterized by dna hybridization studies to identify homologous genomic dna fragments. the proteins they encode were identified by 125i-labeling, immunoblotting, immunofluorescence, and t-cell activation experiments. one, designa ... | 1988 | 2835259 |
| response of 21 canadian field isolates of chicken coccidia to commercial anticoccidial drugs. | coccidia were isolated from 30 broiler farms in major poultry-producing provinces of canada; 21 mixed-species isolates were tested for sensitivity to anticoccidial drugs. eimeria acervulina was identified in 20 samples, e. maxima in 15, and e. tenella in 10 of the mixed-species isolates. on the basis of weight gain after infection, 3 isolates were judged sensitive to amprolium, 5 to monensin, 9 to salinomycin, 14 to lasalocid, 19 to halofuginone, and 20 to nicarbazin. similar trends in sensitivi ... | 1989 | 2751568 |
| multiple concurrent stressors in chicks. 1. effect on weight gain, feed intake, and behavior. | effects of multiple concurrent stressors on hubbard x hubbard chicks (days 10 to 17 posthatch) were studied in a 2(6)-factorial experiment that employed as treatments aerial ammonia (a, 0 or 125 ppm), beak trimming (b, sham handled or beak trimmed/cauterized), coccidiosis (x, gavage with 0 or 6x10(5) sporulated eimeria acervulina oocysts), intermittent electric shock (e, 0 or between 2.9 and 8.7 ma), heat stress (h, 30.4 or 34.8 c) and continuous noise (n, 80 or 95 db). all stressors, except noi ... | 1989 | 2748498 |
| eimeria acervulina and eimeria tenella in 15.b-congenic white leghorns. | six ea-b-congenic lines of chickens were used to study the role of the b histocompatibility complex in susceptibility and immunity to eimeria tenella and e. acervulina. the b haplotypes were 2, 2, 5, 12, 13, or 19. parental line 15i5 with the b15 haplotype (15i5-15) and a commercial white leghorn (cwl) line were also used. the b-congenic lines were generally less susceptible to e. tenella than the cwl line based on weight gain, cecal lesion score, plasma pigment, and packed cell volume. within t ... | 1989 | 2704696 |
| immunization of chickens with live escherichia coli expressing eimeria acervulina merozoite recombinant antigen induces partial protection against coccidiosis. | inoculation of chickens with live escherichia coli n6405 transformants containing a plasmid which encodes ampicillin resistance and an immunodominant p250 surface antigen of eimeria acervulina merozoites induced partial protection against challenge with live coccidia. the inoculation with e. coli transformants induced antigen-specific immunoglobulin and cell-mediated immune responses. challenge with infective oocysts of eimeria acervulina enhanced both immune parameters, indicating that administ ... | 1989 | 2663723 |
| characterization and vaccine potential of a novel recombinant coccidial antigen. | a cdna clone derived from sporulated oocysts of eimeria tenella and encoding the expression product gx3262 was identified using a monoclonal antibody raised against eimeria acervulina sporozoites. the cdna fragment containing the coccidial antigen gene was cloned in bacteriophage lambda gt11, transferred to a plasmid, and introduced into escherichia coli for analysis of the gene products. the strain carrying the plasmid produced gx3262 as part of a fusion protein consisting of the first 1,006 am ... | 1989 | 2659532 |
| eimeria tenella, e. acervulina and e. maxima: studies on the development of resistance to diclazuril and other anticoccidial drugs in the chicken. | resistance to diclazuril was induced by 10 passages of the houghton strains of eimeria acervulina and e. tenella in chickens given progressively greater concentrations of the drug. this resistance was, however, not complete since the drug retained some efficacy against the drug-passaged lines. attempts to passage the houghton strain of e. maxima in birds medicated with concentrations of diclazuril greater than 0.016 parts per million (ppm) were unsuccessful and after 10 passages at this concentr ... | 1989 | 2556680 |
| effect of dietary sodium zeolite a and excess calcium on growth and tibia calcium and phosphorus concentration in uninfected and eimeria acervulina-infected chicks. | two identical trials were conducted with 5 to 14-day-old broiler chicks. sodium zeolite a (nza, 0 and .75%) and ca (1.0 and 1.5%) were fed to both uninfected and eimeria acervulina-infected chicks resulting in a 2 x 2 x 2 factorial arrangement of treatments. coccidial infection reduced weight gain and gain:feed (p less than .01), and tibia ash, ca, and ca:p ratio (p less than .05). excess dietary ca reduced (p less than .05) weight gain and tibia ash in uninfected chicks but had no effect (p gre ... | 1989 | 2554269 |
| studies on the stage of action of lasalocid against eimeria tenella and eimeria acervulina in the chicken. | broiler chickens in battery pens were either fed a diet containing 100 ppm lasalocid or no drug for 24 h prior to inoculation with sporulated oocysts of eimeria tenella or eimeria acervulina. different groups of birds remained on medicated feed for 24, 48, 72, 96, 120 or 144 h after inoculation. conversely, other groups started on an unmedicated diet, were given medicated feed at different times after oocyst inoculation. starting lasalocid medication 24 h (e. tenella) or 48 h (e. acervulina) aft ... | 1990 | 2251751 |
| protective immunization against the intestinal parasite eimeria acervulina with recombinant coccidial antigen. | the gene encoding an immunodominant eimeria acervulina merozoite surface antigen (eamz250) was expressed in bacteria as a fusion peptide with the galactose-binding protein (gbp) of escherichia coli. recombinant and control antigens were administered to 1-wk-old chickens by peroral inoculation with live nonpathogenic bacteria that were expressing gbp-eamz250 or gbp protein. the immunization elicited antigen-specific humoral and cellular immune responses as measured by elisa and t-cell blastogenes ... | 1991 | 2047347 |
| eimeria spp. of the domestic fowl: resolution of chromosomes by field inversion gel electrophoresis. | the molecular karyotypes of five species of chicken coccidia, viz., eimeria acervulina, e. brunetti, e. maxima, e. necatrix, and e. tenella, were determined using field inversion gel electrophoresis (fige). each species has a distinctive set of resolvable chromosomes which range from about 1 to greater than 5.7 megabases. we were able to resolve at least 8 chromosomes for e. acervulina, 5 for e. brunetti, 10 for e. maxima, 6 for e. necatrix, and 9 for e. tenella. if the value of 67 megabases for ... | 1991 | 2015869 |
| development of resistance to coccidiosis in the absence of merogonic development using x-irradiated eimeria acervulina oocysts. | sporulated oocysts of the protozoan eimeria acervulina were subjected to 0, 10, 15, 20, or 30 krad of x-irradiation and inoculated into susceptible outbred chickens to determine if radioattenuated coccidia could induce protection against parasite challenge. irradiation treatment had an appreciable dose-dependent effect on parasite development. insignificant numbers of oocysts were produced by chickens inoculated with parasites that had been exposed to greater than 10 krad x-irradiation. sporozoi ... | 1991 | 2015867 |
| cross-protection against four species of chicken coccidia with a single recombinant antigen. | a cdna clone, so7', from an eimeria tenella cdna library was inserted into the high-expression vector pjc264 and was expressed in escherichia coli as a fusion protein, chey-so7', with a molecular mass of approximately 36 kda. by using the purified recombinant antigen to immunize young chicks, it was demonstrated that a single dose, without adjuvant, not only protected against severe coccidiosis induced by infection with e. tenella but also protected chicks challenged with the heterologous specie ... | 1991 | 2004809 |
| altered metabolism of carotenoids during pale-bird syndrome in chickens infected with eimeria acervulina. | the progression of changes in carotenoid metabolism during pale-bird syndrome caused by a coccidial infection was investigated. male broiler chickens 15 days of age on a yellow corn and soybean meal-based diet were infected with eimeria acervulina oocysts and their serum, liver, and toe webs were sampled at 0, 4, 6, and 10 days postinfection for hplc analysis of carotenoids. at 4 days postinfection a drastic reduction (71%) in serum lutein, the main body carotenoid, and smaller reductions in liv ... | 1991 | 1956852 |
| benzylated 1,2,3-triazoles as anticoccidiostats. | substituted 5-amino-4-carbamoyl-1,2,3-triazoles 3a-w were prepared by two synthetic schemes and evaluated in vivo for anticoccidial activity. both schemes proceeded by brominating appropriately substituted toluenes 4a-s,v to 5a-s,v. in scheme i, the brominated benzyl analogues 5 were converted to the corresponding benzyl azides 6, which were treated with cyanoacetamide to yield 1-substituted-5-amino-4-carbamoyl-1,2,3-triazoles 3. in scheme ii, the benzyl halides 5 were employed to alkylate the s ... | 1991 | 1895303 |
| increase of intestinal intraepithelial lymphocytes expressing cd8 antigen following challenge infection with eimeria acervulina. | eimerian infection-induced changes in the intestinal intraepithelial lymphocyte (iel) subpopulations expressing cd8 antigen (cytotoxic/suppressor t cells) or antigen-specific t cell receptor (tcr) heterodimer alpha beta (tcr2) or gamma delta (tcr1) were investigated in f2 crosses of 15i5 b-congenic chickens differing for the major histocompatibility complex (mhc). duodenum tcr2+ iel were increased in b2 b2 and b5 b5 chickens 7 days following secondary infection. two-color immunofluorescence reve ... | 1991 | 1830202 |
| comparison of resistance level and circulating igg response in chickens experimentally inoculated with a multiple or single immunizing doses of eimeria acervulina. | two immunizing methods (trickle or single immunizing doses) against e. acervulina were tested in chickens. the effects of immunization and challenge upon growth, oocyst output and circulating antibodies response (igg) were compared. neither immunization method produced pathogenic effects, similar numbers of oocysts were produced, and the levels of igg in serum were similar and low in each case. after the challenge, immunized birds showed a high level of resistance but susceptible controls produc ... | 1991 | 1789677 |
| electrophoretic and immunologic characterization of proteins of merozoites of eimeria acervulina, e. maxima, e. necatrix, and e. tenella. | merozoites of eimeria acervulina, eimeria maxima, eimeria necatrix, and eimeria tenella were compared by gel electrophoresis, western-blotting with chicken antiserum, indirect fluorescent antibody reactions, and antiserum neutralization. merozoites from the 4 species had dissimilar patterns of proteins and antigens in soluble and membrane fractions. coomassie blue staining of sds-page gels revealed 16-22 protein bands depending on the species of merozoite but only 3 bands per species in the memb ... | 1992 | 1738074 |
| characterization of a recombinant eimeria acervulina antigen expressed in sporozoite and merozoite developmental stages. | a cdna from eimeria acervulina encoding an immunogenic region of antigens shared between sporozoites and merozoites was cloned and expressed in escherichia coli. immunofluorescence staining of sporozoites, merozoites, and coccidial-infected intestinal tissue with monoclonal antibody used to detect the recombinant clone indicated that the epitope was present on internal parasite proteins. immunostaining of nitrocellulose paper containing protein from both asexual stages revealed numerous sporozoi ... | 1991 | 1710269 |
| effects of major histocompatibility genes and antigen delivery on induction of protective mucosal immunity to e. acervulina following immunization with a recombinant merozoite antigen. | intramuscular immunization with the recombinant p250 surface antigen of eimeria acervulina merozoite (reamzp250) or oral inoculation with live recombinant escherichia coli expressing the reamzp250 protein resulted in antigen-specific t-cell and humoral responses and conferred a significant reduction in mucosal parasitism compared to immunization with the negative control antigen preparation. among the major histocompatibility complex (mhc) (b)-congenic chickens receiving intramuscular immunizati ... | 1990 | 1698712 |
| eimeria acervulina: cloning of a cdna encoding an immunogenic region of several related merozoite surface and rhoptry proteins. | a cdna encoding a recombinant eimeria acervulina antigen, designated eamzp30-47, that contains an epitope shared among several surface and rhoptry proteins of merozoites was characterized. the respective parasite proteins are between 30 and 47 kda as revealed by immunostaining of nitrocellulose membrane containing extracts of 125i-labeled merozoites. as indicated by immunofluorescence and immunoelectron microscopic staining, the reactive epitope was localized to both the surface membrane and the ... | 1990 | 1690144 |
| potential of a recombinant antigen as a prophylactic vaccine for day-old broiler chickens against eimeria acervulina and eimeria tenella infections. | a genetically engineered eimeria tenella antigen (gx3262), produced as a fusion protein with beta-galactosidase and identified with a monoclonal antibody, induced partial but significant protection in young broiler chickens against experimental e. tenella and eimeria acervulina infections. the antigen appears to share a t-helper cell epitope with the parasite as evidenced by (a) booster inoculation with either the recombinant antigen or with a small number of live oocysts enhanced the protective ... | 1992 | 1589958 |
| influence of coccidiosis on salmonella colonization in broiler chickens under floor-pen conditions. | the influence of coccidiosis on colonization of salmonella typhimurium in broiler chickens under floor pen conditions was studied by semiquantitative methods. chickens of two groups, unmedicated and medicated with nicarbazin (125 ppm via the feed), were exposed to three species of eimeria (eimeria tenella, eimeria maxima, and eimeria acervulina) at 2, 3, and 4 wk of age and given s. typhimurium in the feed 2 days later. salmonella typhimurium was isolated most often (100%) from ceca of chickens ... | 1992 | 1539023 |
| colostrum from cows immunized with eimeria acervulina antigens reduces parasite development in vivo and in vitro. | experiments were undertaken to determine whether passive immunization utilizing hyperimmune bovine colostrum (hbc) specific for eimeria acervulina (ea) antigens conferred protection against coccidiosis in chickens. the hbc was produced by immunizing three pregnant, nonmilking jersey cows with ea antigens administered via one intramuscular injection followed by three intramammary infusions at approximately 10, 8, 6, and 4 wk before parturition. one cow was immunized with sporozoites (sz), the sec ... | 1992 | 1454682 |
| eimeria acervulina, e. brunetti, and e. maxima: pathogenic effects of single or mixed infections with low doses of oocysts in chickens. | 1976 | 1269585 | |
| eimeria acervulina, e. brunetti, and e. maxima: immunity in chickens with low multiple doses of mixed oocysts. | 1975 | 1204712 | |
| immune responses to infections with coccidia in chickens: gut hypersensitivity. | sporulated oocysts or oocyst hulls of eimeria acervulina given via the crop, and oocyst juice or sporozoites inoculated directly into the intestinal lumen, were tested for their effects on the hypersensitivity of the intestines of immunized and susceptible birds. only viable sporozoites consistently caused an increase in the permeability of the immunized intestine to macromolecules, shown by the leakage of intravenously injected dye. repulsion of epithelium and disruption of the villi were seen ... | 1975 | 1202410 |
| scanning electron microscopy of the duodenal mucosa of chickens infected with eimeria acervulina. | the morphology of the duodenal mucosal surface of chickens infected with eimeria acervulina has been studied on days 5, 6, 8 and 11 post-infection and compared with that of the normal duodenal mucosa using the scanning electron microscope. the normal duodenum possessed tall, spatulate villi with horizontally-arranged surface clefts upon which a regular pattern of hexagonal absorptive cells and goblet cell mouths was superimposed. a maximum degree of villous atrophy was shown on day 5 post-infec ... | 1975 | 1187183 |
| infections with eimeria maxima and eimeria acervulina in the fowl: effect of previous infection with the heterologous organism on oocyst production. | judged by oocyst production, infections with eimeria acervulina in birds immunized with e. maxima were consistently higher than in birds which had not been immunized. oocyst production of e. maxima in birds previously infected with e. acervulina was greater, in three out of four experiments, than in control chickens, but some of the differences were slight. the findings are discussed but no satisfactory explanation can be offered. in general there was little or no difference between the oocys ... | 1975 | 1168890 |
| anticoccidial activity of lasalocid in control of moderate and severe coccidiosis. | the fermentation product lasalocid ("antibiotic x-537a," hoffmann-laroche) showed good anticoccidial activity when administered via feed at 50 or 75 ppm in a replicated floor-pen experiment. lasalocid was compared with monensin (121 ppm) ("positive control") and also with unmedicated ("negative") controls in pens heavily seeded or indirectly seeded with eight species of coccidia (eimeria acervulina, e. brunetti, e. hagani, e. maxima, e. mitati, e. necatrix, e. praecox, and e. tenella). under sev ... | 1975 | 1120028 |
| structure and mode of function of the organelles associated with nutrition of the macrogametes of eimeria acervulina. | the macrogamete of eimeria acervulina, lay and developed within the host cell in a parasitophorous vacuole. the cytoplasmic membrane of the host cell bordering the vacuole was not smooth, but it had numerous folds extending into the vacuole. these "intravacuolar folds" varied in depth and number in different sections. in some, the majority of the folds were disconnected from the host cell. once disconnected, they evidently disintegrated forming the amorphous, particulate material present in the ... | 1975 | 1114870 |
| [resistance of eimeria acervulina to statil, 3,5-dinitrobenzamide and acylinidrazone]. | 1975 | 1114676 | |
| reproduction of the cycle of coccidia eimeria acervulina (tyzzer, 1929) in cell cultures of chicken kidneys. | the cycle of eimeria acervulina was grown in primary culture of cells of three-week-old-chicken kidneys. eht medium (eagle, hydrolysate of lactalbumine, bacto-tryptose phosphate) allowed the development of this coccidium. 44 hours after infestation of the cells with sporozoites, the first schizonts appeared. the merozoites of first generation were released after 54 hours. they invaded the neighbouring cells and developed in them into schizonts of second generation mature after 68 hours. after 72 ... | 1976 | 1027365 |
| studies on site finding and site specificity of eimeria praecox, eimeria maxima and eimeria acervulina in chickens. | sporozoites of 3 species of eimeria were introduced into the caecum of young chickens. e. praecox and e. maxima failed to develop in this site, but light infections of e. acervulina were detected. infection of the small intestine with all 3 species occurred when sporozoites were introduced via the caecum. infections were produced when mucosal scrapings of small intestine from birds, inoculated via the caecum 1-4 h previously, were inoculated orally to susceptible chickens. experiments with 51cr- ... | 1976 | 1012749 |
| eimeria acervulina, e. brunetti, e. maxima, and e. necatrix: low doses of oocysts to immunize young chickens. | 1976 | 971728 | |
| studies on the growth, chemotherapy and enzyme variation of eimeria acervulina var. diminuta and e. acervulina var. mivati. | eimeria acervulina var. diminuta was serially passaged 12 times in chicken embryos, but growth in cultured chick kidney cells was limited to 2 generations of schizonts. after 7 embryo passages the sensitivities of e. acervulina var. diminuta and an embryo-adapted strain of e. acervulina var. mivati to the anticoccidial drugs amprolium, methyl benzyquate, robenidine and sulphaquinoxaline were compared. both parasites were sensitive to all the anticoccidials but e. acervulina var. diminuta was mor ... | 1977 | 927885 |
| changes in the generation cycle of duodenal crypt cells in chickens infected with eimeria acervulina. | changes in the duration of the progenitor cycle and its four phases were determined for duodenal crypt cells in chickens infected with eimeria acervulina. metaphase curves were constructed using percent labelled metaphase nuclei in duodenal crypt cells at short intervals after the injection of [3h]thymidine. the duration of the progenitor cycle and its four phases were calculated using the synthetic index and data obtained from the metaphase curves. the cycle time was reduced from 14 h in contro ... | 1977 | 906627 |
| influence of dietary aflatoxin on the severity of eimeria acervulina infection in broiler chickens. | broiler chicks (hubbard x hubbard) receiving 2.5 microgram of aflatoxin/g of diet and inoculated with sporulated oocysts of eimeria acervulina gained significantly less weight than chicks receiving either aflatoxin or coccidia alone. aflatoxin alone affected body weight more in females than males. blood parameters, however, showed no sex-related differences to e. acervulina or aflatoxin. e. acervulina had no effect on packed cell volume, red cell number, or hemoglobin levels. gross lesions in th ... | 1978 | 697658 |
| anticoccidial activity of salinomycin in battery raised broiler chickens. | infections with single species of eimeria acervulina, e. mivati, e. maxima, e. tenella, e. necatrix, and e. brunetti, and the six species mixed, were utilized in three separate battery experiments to evaluate the anticoccidial efficacy of various levels of salinomycin (ahr-3096), a fermentation product of a strain of streptomyces albus. at the 60 to 100 p.p.m. treatment levels, this compound showed significant anticoccidial activity for all parameters studied (mortality, weight gain, feed conver ... | 1977 | 605065 |
| anticoccidial activity of narasin in battery raised broiler chickens. | the anticoccidial activity of the ionophorus antibiotic narasin was tested against six species of coccidia (eimeria acervulina, eimeria mivati, eimeria maxima, eimeria necatrix, eimeria brunetti, and eimeria tenella) in battery-raised broilers. feeding ration medicated with 60, 80, or 100 ppm narasin significantly improved weight gains during the periods of d 0 to d7 and d 0 to d 14 (d 0 = day of inoculation with sporulated oocysts), compared with the weight gains in corresponding inoculated gro ... | 1979 | 530901 |
| incidence of chicken coccidia from broiler houses in japan, 1973-1977. | a survey was made on the incidence of coccidial oocysts in 11,365 fecal samples from japanese broiler houses during five years from 1973 to 1977. the eimerian species were identified by a combination of two methods, examination of oocyst morphology and chicken passage test. oocysts were detected from 7,526 (66.2%) of the samples tested during five years. annual variation was statistically significant at the 5% level. coccidial incidence during july to september (corresponding to summer season) w ... | 1979 | 506554 |
| a reappraisal of the taxonomic status of eimeria mivati edgar and seibold 1964, by enzyme electrophoresis and cross-immunity tests. | an examination of 2 strains of eimeria acervulina var. mivati (since 1973 e. mivati has been regarded as a variant of e. acervulina) showed that previous confusion over the taxonomic status of e. mivati arose because the investigations were done using laboratory cultures of e. mivati which were contaiminated with e. acervulina. electrophoretic analyses of enzymes, host specificity and cross-immunity tests have revealed that: (1) the 1971 houghton strain of e. acervulina var. mivati was a mixture ... | 1979 | 471536 |
| energy and nitrogen metabolism of chickens subjected to infection and reinfection with eimeria acervulina. | 1. the effects of e. acervulina on energy and nitrogen metabolism were studied in respiration chambers on four groups of four broilers aged 16 d: group c was infected with 1.1 x 10(6) oocysts/bird on day 1 and fed ad libitum, while groups a, b and d were pair-fed to group c to day 16 of the experiment. on day 17, groups a and c were given 5.0 x 10(6) oocysts/bird and fed ad libitum, while group b was pair-fed to group a and group d was pair-fed to group c to the end of experiment on day 32. 2. d ... | 1979 | 466524 |
| energy and nitrogen metabolism of chickens infected with either eimeria acervulina or eimeria tenella. | 1. the effects of sublethal infections of e. acervulina and e. tenella on the energy and nitrogen metabolism of groups of five broilers aged 16 d were studied for 16 d in respiration chambers. 2. the metabolisable energy content of the diet for chickens infected with e. acervulina was 0.689 of its gross energy content and n retention was 42.5 g/100 g n intake compared with 0.738 and 47.1 g respectively, in uninfected pair-fed controls. chickens infected with e. tenella were similarly affected. 3 ... | 1979 | 466523 |
| the site of action of the anticoccidial salinomycin (coxistac). | the anticoccidial salinomycin has a cidal effect against chicken coccidia. restricted and unrestricted medication studies and histopathological examinations of chicks infected with eimeria acervulina, e. maxima, or e. tenella showed that parasites were destroyed within host cells during asexual development. most sporozoites failed to become trophozoites and were destroyed 30--72 hr after ingestion of oocysts. the drug also affected schizonts during initial nuclear replication by either destroyin ... | 1979 | 448588 |
| disaccharidase activity in the intestinal tissue of broilers infected with coccidia. | maltase and sucrase activities were measured in the intestine of broilers inoculated with sporulated coccidial oocysts. infection with eimeria acervulina, e. maxima, e. necatrix, and e. brunetti decreased disaccharidase activity in the intestinal region in which maximum infection was found compared with the activity in uninoculated controls. the maximum reduction occurred on the first or second day of patency followed by a rapid recovery in activity. disaccharidase activity was inversely proport ... | 1978 | 355614 |
| speciation studies with eimeria acervulina and eimeria mivati. | eimeria mivati was described as a new species of chicken coccidia in 1964 by edgar and seibold, but recently some british workers have relegated its status to that of a variety of eimeria acervulina. using strains supplied by dr. edgar, we have prepared lines of e. acervulina resistant to methyl benzoquate, sulfaquinoxaline and robenidine and a line of e. mivati resistant to methyl benzoquate. genetic transfer of resistance between the various lines of e. acervulina to produce doubly-resistant c ... | 1978 | 281483 |
| effect of eimeria acervulina infection on nutrient retention with special reference to fat malabsorption in chickens. | nutritional balance studies were conducted to determine the effect of eimeria acervulina infection on the retention of nutrients and the efficiency of utilization of protein and energy in the diet during the course of intestinal coccidiosis in chickens. both light and electronmicroscopic studies were conducted to elucidate the pathogenesis of fat malabsorption in the infected chickens. the infection with e. acervulina during the acute phase of the disease (day 4 to day 8 postinfection) caused a ... | 1975 | 164990 |
| some mechanisms of reduction of carotenoid levels in chickens infected with eimeria acervulina or e. tenella. | the levels of plasma carotenoids were markedly reduced in broiler cockerels infected with eimeria acervulina or e. tenella. the mechanisms of this depigmentation differed between the two species, being primarily associated with interference of absorption of xanthophyll (carotenoids) from the intestinal lumen with e. acervulina infection and with leakage through the damaged wall of the cecum with e. tenella infection. chicks reared on an essentially carotenoid-free diet and inoculated with e. ace ... | 1975 | 476 |