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Evaluation of Sires Available through Planned Mating

Cornell University, Ithaca, New York

Abstract

A comparison was made between records of daughters of three Holstein sires used in planned mating programs and records of their dams in order to determine the influence of selectivity of mating on sire evaluation. The number of daughter-dam sets ranged from 33 to 44. The results showed that all three sires were mated to cows in above average herds.

One sire was mated to cows which averaged above their herd mates by 599 lb. of milk and 31.6 lb. of fat. The other sires were mated to cows averaging nearer to their herd mates: –285 lb. of milk and –1.7 lb. of fat, and 334 lb. of milk, 0.5 lb. of fat respectively. Selection index estimates of daughter superiority were only slightly changed when dam records were considered in addition to daughter records even for the sire mated to cows averaging considerably above their herd mates.