| effect of pathogen-specific clinical mastitis on herd life in two new york state dairy herds. | the objective of this study was to estimate the effects of clinical mastitis (cm) (both with and without specific pathogen identification) occurring in different stages of lactation on length of herd life in two new york state dairy farms. the 2,697 cows in the study were followed for one lactation (the first-occurring one on or after 1 october 1999), until it ended because of a new lactation, culling, or end of study (31 march 2001 in one farm; 31 july 2001 in the other). a cox proportional haz ... | 2005 | 16111778 |
| the effect of recurrent episodes of clinical mastitis caused by gram-positive and gram-negative bacteria and other organisms on mortality and culling in holstein dairy cows. | the objective of this study was to estimate the effects of recurrent episodes of different types of clinical mastitis (cm) caused by gram-positive (streptococcus spp., staphylococcus aureus, staphylococcus spp.) and gram-negative (escherichia coli, klebsiella, citrobacter, enterobacter, pseudomonas) bacteria, and other organisms (arcanobacterium pyogenes, mycoplasma, corynebacterium bovis, yeast, miscellaneous) on the probability of mortality and culling in holstein dairy cows. data from 30,233 ... | 2011 | 21943738 |
| effects of pathogen-specific clinical mastitis on probability of conception in holstein dairy cows. | the objective of this study was to estimate the effects of pathogen-specific clinical mastitis (cm), occurring in different weekly intervals before or after artificial insemination (ai), on the probability of conception in holstein cows. clinical mastitis occurring in weekly intervals from 6 wk before until 6 wk after ai was modeled. the first 4 ai in a cow's lactation were included. the following categories of pathogens were studied: streptococcus spp. (comprising streptococcus dysgalactiae, st ... | 2014 | 25173468 |
| pathogen-specific effects on milk yield in repeated clinical mastitis episodes in holstein dairy cows. | the objective of this study was to estimate the effects of clinical mastitis (cm) cases due to different pathogens on milk yield in holstein cows. the first 3 cm cases in a cow's lactation were modeled. eight categories of pathogens were included: streptococcus spp.; staphylococcus aureus; coagulase-negative staphylococci (cns); escherichia coli; klebsiella spp.; cases with cm signs but no bacterial growth (above the level detectable by our microbiological procedures) observed in the culture sam ... | 2014 | 24418269 |