| acquired resistance of merino sheep against fasciola gigantica. | merino sheep acquired resistance against fasciola gigantica, which is contrary to previous observations of infections with f. hepatica in that breed. the acquired resistance was manifest against young adult parasites. st. croix sheep had previously been shown to have more resistance than european sheep against f. hepatica after primary infection; however, in f. gigantica infections in the present study there was no difference between the resistance levels of the breeds. antigenic analysis of the ... | 1996 | 8897512 |
| evidence for a major gene determining the resistance of indonesian thin tail sheep against fasciola gigantica. | the genetic basis of the high resistance of indonesian thin tail (itt) sheep against fasciola gigantica has been studied by measuring the resistance levels of itt sheep, st. croix sheep and their f2 and f3 crossbreds. all of the sheep were bred and reared in the same environment. approximately half of the f2 and f3 crossbreds were as resistant as the itt parental breed, one-quarter had the low resistance of the st. croix parental breed and the rest had an intermediate level of resistance. it is ... | 1997 | 9106952 |
| resistance of indonesian thin tail sheep against fasciola gigantica and f. hepatica. | high resistance of indonesian thin tail (itt) sheep against fasciola gigantica has been confirmed. naive itt sheep had only 17% of the number of mature parasites collected from control st. croix sheep. in contrast, the level of resistance of itt sheep against f. hepatica was the same as that of the low resistance merino breed after both primary and secondary infections. it is suggested that resistance of itt sheep against f. gigantica was manifested in two phases. the major phase appeared to be ... | 1997 | 9066053 |