Records of the number of cases of clinical mastitis during the first lactation of 1,675 cows, primarily Holsteins. Cows belonged to 41 herds and were daughters of 38 sires. There were 1,491 healthy cows, 134 had only one case of mastitis, 36 had 2 cases, and 14 had between 4 and cases. Overall, mastitis incidence was 0.11. Calving years for these records were from 2000 through 2005. The sire, herd and days in milk are also recorded for each cow.
A data frame with 1675 observations on the following 8 variables.
idIdentifier of the animal.
sireIdentifier of the animal's sire.
birthyear of birth of the animal (as a factor).
herdherd id number (as a factor).
calvingYearyear of calving for this lactation.
DIMtotal number of days in milk for the lactation.
mastitisa factor indicating if the cow had any incidents of clinical mastitis during the lactation.
NCMAn ordered factor giving the number of clinical mastitis cases for the cow during this lactation.
The pedigree of the sires is given in the companion
pedSires data set.
2010. A.I. Vazquez, D.M. Bates, G.J.M. Rosa, D. Gianola and K.A. Weigel. Technical Note: An R package for fitting generalized linear mixed models in animal breeding. Journal of Animal Science, 88:497-504.
pedSires, pedigree
str(mastitis)
summary(mastitis, maxsum = 10)
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