mastitis {pedigreemm} | R Documentation |
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.
id
sire
birth
herd
calvingYear
DIM
mastitis
NCM
The pedigree of the sires is given in the companion
pedSires
data set.
Vazquez, A.I. 2007. Analysis of number of episodes of clinical mastitis in Norwegian Red and Holstein cows with Poisson and categorical data mixed models. Master of Science Thesis. University of Wisconsin - Madison. 162 pp.
str(mastitis) summary(mastitis, maxsum = 10)