Records of the milk production of 3397 lactations from first through fifty parity Holsteins. These were 1,359 cows, daughters of 38 sires in 57 herds. The data was downloaded from the USDA internet site. All lactation records represent cows with at least 100 days in milk, with an average of 347 days. Milk yield ranged from 4,065 to 19,345 kg estimated for 305 days, averaging 11,636 kg. There were 1,314, 1,006, 640, 334 and 103 records were from first thorough fifth lactation animals.
A data frame with 3397 observations on the following 9 variables.
numeric identifier of cow
number of lactation for which production is measured
a factor indicating the herd
a factor indicating the sire
number of days in milk for that lactation
milk production estimated at 305 days
fat production estimated at 305 days
protein production estimated at 305 days
the somatic cell score
USDA web site. http://www.aipl.arsusda.gov/
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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