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The frequency of cows served twice which remain pregnant to first service: a study of results from parentage tests

Published online by Cambridge University Press:  01 October 1962

J. Rendel ,
J. Bouw  and
D. O. Schmid
J. Rendel
Affiliation:
Institute of Animal Breeding, Royal Agricultural College, Uppsala, Sweden
J. Bouw
Affiliation:
Stichting Bloedgroepen Onderzoek, Wageningen, The Netherlands
D. O. Schmid
Affiliation:
Institut für Blutgruppenforschmg der Tierzuchtforschung e.V. München, Germany
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Extract

In 1,347 parentage cases in cattle it was determined whether conception resulted from the first or second service. Among cows served twice within short intervals (1–11 days) about 20% remained pregnant from the previous service. At an interval of one day this proportion amounted to 37%.

About three-quarters of the cows had service intervals of 18–24 days. In most of these the calving took place between the expected dates according to the two services. In 6% of the cases with intervals of 18–24 days pregnancy resulted from the first service. It was estimated that about 1% of all cows mated twice within these intervals had become pregnant from the first service.

Rules are suggested for when blood grouping should be required for registration of pedigrees in the herd book.

Type
Research Article
Information
Animal Production , Volume 4 , Issue 3 , October 1962 , pp. 359 - 367
Copyright
Copyright © British Society of Animal Science 1962

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References

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