Reproductive efficiency related traits evaluation in beef genotypes under humid tropical conditions

• Eduardo Casas ^[1] ; Assefaw Tewolde ^[2]
  1. [1] USDA, ARS, U.S. Meat Animal Research Center, P.O. Box 166, Clay Center, NE 68933
  2. [2] UAT, México
• Localización: Archivos Latinoamericanos de Producción Animal, ISSN 1022-1301, ISSN-e 1022-1301, Vol. 9, Nº. 2, 2001
• Idioma: inglés
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• Resumen

  • The objective of the study was to quantify genetic and nongenetic effects, and to estimate genetic variance, on reproductive efficiency traits in a herd with Romosinuano inheritance managed under tropical conditions. Records collected from 1959 to 1989 at the Tropical Agronomic Center for Research and Education, Costa Rica (CATIE), were used to calculate age at first calving (AFC; days) and calving interval (CI; days). Animals with 50% or less Romosinuano inheritance (BG1; n= 496) and with more than 50% Romosinuano inheritance (BG2; n= 1045) were classified as different breed groups. Age of dam influenced AFC and CI (P