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The Repeatability of Performance of Several Hereford Sires as Measured by Progeny Records

U. S. Department of Agriculture

Abstract

There was no significant difference in birth weights between calves sired at Miles City and calves sired at Havre, but there was a barely significant difference between sire groups.

Calves at the Havre station averaged significantly faster gains from birth to weaning than did the calves at the Miles City Station. There was also a significant difference in average daily gains from birth to weaning between sire groups. Sires producing fast gaining calves at one station tended to do the same at the other station.

There was no significant difference between stations in average daily gams in the feed lot. There was a significant difference between sire groups and a sire x station interaction. Hence, some of the sire groups made fast gains at Bozeman and slow gains at Miles City. With other sire groups the reverse was true.

An analysis of the efficiency of gains in the feed lot showed that the steers fed at Bozeman averaged significantly more efficient gains than did the steers fed at Miles City. The remainder of the analysis showed results similar to those obtained from the study of rate of gain in the feed lot. There was a significant difference between sire groups and a sire x station interaction.

It was evident from these studies, that, in a broad program of record of performance testing of beef cattle, procedures should be standardized and refined as much as possible to eliminate certain variables that may affect comparative sire ratings.