Description Format Details Source References See Also Examples
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
Identifier of the animal.
sire
Identifier of the animal's sire.
birth
year of birth of the animal (as a factor).
herd
herd id number (as a factor).
calvingYear
year of calving for this lactation.
DIM
total number of days in milk for the lactation.
mastitis
a factor indicating if the cow had any incidents of clinical mastitis during the lactation.
NCM
An 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.
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.
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.
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.
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Loading required package: lme4
Loading required package: Matrix
'data.frame': 1675 obs. of 8 variables:
$ id : Factor w/ 1675 levels "62","105","671",..: 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 ...
$ sire : Factor w/ 352 levels "1","2","3","4",..: 2 2 2 2 2 2 2 2 2 2 ...
$ birth : Ord.factor w/ 10 levels "1989"<"1990"<..: 1 1 2 2 2 2 2 2 1 1 ...
$ herd : Factor w/ 41 levels "1","2","4","5",..: 40 40 40 40 40 40 40 40 40 40 ...
$ calvingYear: Ord.factor w/ 6 levels "2000"<"2001"<..: 5 5 5 5 5 5 5 5 5 5 ...
$ DIM : int 286 281 305 281 305 305 305 330 305 273 ...
$ mastitis : Factor w/ 2 levels "N","Y": 1 1 1 1 1 1 1 1 1 1 ...
$ NCM : num 0 0 0 0 0 0 0 0 0 0 ...
id sire birth herd calvingYear
62 : 1 343 : 68 1989: 33 89 : 106 2000: 17
105 : 1 327 : 62 1990: 16 14 : 104 2001:106
671 : 1 348 : 58 1996: 3 2 : 91 2002:333
692 : 1 329 : 53 1997: 17 23 : 75 2003:561
726 : 1 3 : 51 1998: 68 69 : 72 2004:594
894 : 1 2 : 49 1999:149 59 : 61 2005: 64
896 : 1 319 : 49 2000:353 90 : 57
897 : 1 326 : 49 2001:532 45 : 52
899 : 1 328 : 49 2002:454 68 : 50
(Other):1666 (Other):1187 2003: 50 (Other):1007
DIM mastitis NCM
Min. : 15.0 N:1491 Min. :0.0000
1st Qu.:303.0 Y: 184 1st Qu.:0.0000
Median :330.0 Median :0.0000
Mean :346.3 Mean :0.1552
3rd Qu.:374.0 3rd Qu.:0.0000
Max. :989.0 Max. :6.0000
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