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Effectiveness of Model for Cow Evaluation Intraherd

Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1

ABSTRACT

Cow evaluations for production derived from an intraherd model for six dairy breeds were studied. Cow evaluations calculated within each of two herds were correlated and agreed closely with correlations expected from selection index. Another study compared genetic trends from sires, dams, and cows and found that trends from sire usage were more than twice as large as trends from dams. Comparison of sire evaluations with average evaluations of mates showed that nonrandom mating of sires with dams occurred infrequently and likely had no influence on sire evaluations. Other possible uses of cow evaluations were for differences between herds, genetic trends within herds, pedigree indexes for future offspring, and relation of pedigree indexes to Estimated Transmitting Abilities.