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Effect of Sire of Fetus on Subsequent 90-Day Production of the Holstein Dam

Department of Animal Science, Macdonald College of McGill University, 21,111 Lakeshore Road, Ste. Anne de Bellevue, Québec, Canada H9X 1C0

ABSTRACT

Data on calving ease and 90-day milk, fat, protein, fat percent, and protein percent were available on 8,817 Holstein cows enrolled in the Quebec Dairy Herd Analysis Service. These observations were distributed in 802 herds, and they represented 124 service sires. Estimates of the variance components associated with the service sire (sire of fetus) were obtained by Minimum Norm Quadratic Unbiased Estimation procedures. Two models were fitted; one model included herd, month of calving, age of cow, and sire of cow as fixed effects and service sire and residual as random effects, whereas a second model included calving ease as an additional fixed effect. Variance components and percentages of variance accounted for by service sire were similar under both models. Proportions of variance accounted for by service sire were 1.1, .3, .5, .2, and .3% for 90-day milk, fat, protein, fat percent, and protein percent.

¹ The Bharatiya Agro-Industries Foundation, Uruli-Kanchan, District Puna, India 412202.