CALVING INTERVAL OF A BRANGUS HERD IN THE MEXICAN HUMID TROPIC
Data from 2,593 observations recorded between 1971 and 1984 in a herd of 652 commercial Brangus cows located in the humid tropic of México were analyzed to estimate the calving interval (CI) as well as the effect of year of calving (YC), season of calving (SC), age of cow and sex of calf on the CI. The repeatability for CI was also estimated by the intraclass correlation method, including the cow effect in a mixed model as a random effect. The overall mean for CI was 413.1 ± 67.3 days, with YC, SC, and the interaction YC x SC significantly influencing its variation. The effect of YC did not show a consistent pattern, with means ranging from 404 (1974) to 423 (1982 and 1983) days. Concerning SC, the means were 409 days for the dry season (mar-jun), 416 days for the rainy season (jul-oct), whereas the highest mean (437 days) was found in the windy season (nov-feb). When the interaction YC x SC effect was examined, it showed in general, that the lowest means during the years of study were found in the dry season and the highest means of CI in the windy season. The repeatability estimate for CI in this population was 0.11 ± 0.02.
| Principais autores: | , , , , |
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| Formato: | Digital revista |
| Idioma: | spa |
| Publicado em: |
Colegio de Postgraduados
1996
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| Acesso em linha: | https://www.agrociencia-colpos.org/index.php/agrociencia/article/view/1340 |
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