J. Anim Sci.
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J. Anim Sci. 1979. 49:374-377.
© 1979 American Society of Animal Science
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Repeatability of Calving Intervals in Brahman Cows

Nelia Peña de Borsotti, O. Verde and D. Plasse1

Universidad Central, Facultad de Ciencias Veterinarias, Maracay, Venezuela

Abstract

Variability in 5,564 calving intervals of 1,958 Brahman cows from 10 private herds with year-round breeding, located in different regions of Venezuela, was analyzed within each herd to estimate repeatability. The basic least-squares model included effects of year and month of the calving which initiated the interval, cow and age of cow at calving. Least-square means for calving intervals varied among herds from 412.86 ± 4.19 to 565.61 ± 11.30 days. Individual herd repeatabilities were .05, .08, .09, .13, .25, .29, .29, .32, .36 and .50.

Footnotes

1 Collaboration of the following ranches, which supplied the basic data, is appreciated: Central Matilde, Coquito, Copra, Los Embalses, Gonzalero, La Herrereña, La Marroquina, Piñero, Santa Clara and La Vaca.






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Copyright © 1979 by the American Society of Animal Science.