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The Use of First Records versus the Average of All Records in Dam-Daughter Comparisons when Proving Sires^*

West Virginia Agricultural Experiment Station, Morgantown, W. Va.

ABSTRACT

A comparison was made of first dam-daughter 305-day mature equivalent records, and the averages of all records on a similar basis, in reporting dam-daughter comparisons for dairy sires. A comparison of these data for 169 Ayrshire sires and 3388 dam-daughter pairs shows there is only a very small and insignificant difference in the results obtained by the two methods. The averages of dams' and daughters' records and the averages of sire indices calculated by the use of both types of comparisons show that the first records on a mature equivalent basis average slightly higher than the averages of all records on the same basis. It is suggested that a real saving can be made in the labor required to report dam-daughter comparisons by using first records only in dam-daughter comparisons.

^* Published with the approval of the Director of West Virginia Agricultural Experiment Station as Scientific Paper No. 305.

¹ Department of Dairy Husbandry, West Virginia Agricultural Experiment Station.

² Ayrshire Breeders' Association, Brandon, Vermont.