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Journal of Dairy Science Vol. 65 No. 8 1588-1595
© 1982 by American Dairy Science Association ®
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Differences in Semen Values Between Summarized and Sampling Sires1

R. B. Thornton,, G. L. Hargrove, and L. W. Specht

Department of Dairy and Animal Science, The Pennsylvania State University, University Park 16802

ABSTRACT

Holstein cows in 19 Pennsylvania state-owned herds were used to estimate the additional value (premium) of semen from sires with progeny summaries versus the value of semen from pedigree-selected sampling sires available through artificial insemination. Within each herd, original cows were divided into two breeding groups; one group was bred to summarized sires and the other to sampling sires.

An average of 8.4 inseminations was used to produce each milking daughter, based on an average of 5.39 services per live heifer calf and 64.3% survival of heifers from birth to enrollment on production testing. There were 457 first lactations of daughters of summarized bulls and 407 first lactations of daughters of sampling bulls. Differences of milk yield favored the summarized group in each of the first three lactations. Survival rates of cows from first to second and third lactations were 71.6 and 50.8%.

Milk was priced at $30.65 with a $.35/.l% fat differential per 100 kg with 50% of gross returns assigned to cover costs of production. The premium for semen from summarized versus sampling sires should be at least $3.75. This premium is a minimum because investment in semen plus interest compounded at 5% per annum was required to be recovered in three lactations and no value was given for type, pedigree, or contribution to future generations.

FOOTNOTES

1 Journal No. 6260, Pennsylvania Agricultural Experiment Station, The Pennsylvania State University, University Park 16802.






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Copyright © 1982 by the American Dairy Science Association ®.