Yearly production trends and genetic and environmental influences in a genetically closed Brahman herd. 4. Percentages of pregnancy, calving, weaning, availability at 18 months and production per cow

  • Dieter Plasse Facultad de Ciencias Veterinarias, Universidad Central de Venezuela, Maracay
  • Omar Verde Sandoval Universidad Central de Venezuela, Maracay, Venezuela
  • Jorge Beltran Facultad de Ciencias Veterinarias, Universidad Central de Venezuela, Maracay
  • Abraham Hernandez Facultad de Ciencias Veterinarias, Universidad Central de Venezuela, Maracay
  • Nelson Marquez Facultad de Ciencias Veterinarias, Universidad Central de Venezuela, Maracay
  • Ali Capriles Facultad de Ciencias Veterinarias, Universidad Central de Venezuela, Maracay
  • Luis Arriojas Facultad de Ciencias Veterinarias, Universidad Central de Venezuela, Maracay
  • Thomas Shultz Facultad de Ciencias Veterinarias, Universidad Central de Venezuela, Maracay
  • Nelson Braschi Facultad de Ciencias Veterinarias, Universidad Central de Venezuela, Maracay
  • Ali Benavides Facultad de Ciencias Veterinarias, Universidad Central de Venezuela, Maracay
Keywords: Brahman, cows, reproductive efficiency, productive efficiency, elimination

Abstract

In a Brahman herd, non-genetic effects were evaluated on the procreation percentage when diagnosing pregnancy (P), at calving (N), at weaning (D) and when the calf was 18 months old (X); also on live weight production per cow in herd at weaning (PDVR) and at 18 months (P18VR). The analyzes of variance used Models I and II, which included: year of service (A, 1965-1975); bull in service (T, N=45); lactation status (L, only Model I); age in TS (E, 2-13 years); and weight at the beginning of TS (PS). Significant effects (P<.01) had A, T and E on all four procreative characters in both models; L (Model I) also had them; PS had effects (P<.05) on P and N (Model I) and on D and X (Model II). The adjusted mean percentages of P, N, D (n=2092) and X (n=1877) were: Model I, 72.9±2.1, 67.7±2.2, 62.2±2.3 and 58.3±2.4; Model II, 69.1±1.6, 65.0±1.7, 59.7±1.8, 56.8±1.9. The constants of the bull with the highest value exceeded those of the lower bull in P, N, D and X by 192, 233, 191 and 225%. At 2 years of age, the constants were lower (-28.5, -25.8, -25.3 and -22.7%), while the maximum values ​​corresponded to E = 5 and 6 years. The average BW was 399±1.3kg and for each increase of 10kg the percentages of P and N each rose 0.6. The cumulative mortality of children, from P to N, D and X was 5.5, 11.7 and 13.8%, having a marked tendency to decrease over time. The PDVR and P18VR averages were 93.3 and 167.6kg, with increases between 1965 and 1974 of 221 and 264%. The annual elimination rate of heifers and cows showed averages of 19 and 20%, respectively.

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Published
1995-12-30
How to Cite
Plasse, Dieter, Omar Verde Sandoval, Jorge Beltran, Abraham Hernandez, Nelson Marquez, Ali Capriles, Luis Arriojas, Thomas Shultz, Nelson Braschi, and Ali Benavides. 1995. “Yearly Production Trends and Genetic and Environmental Influences in a Genetically Closed Brahman Herd. 4. Percentages of Pregnancy, Calving, Weaning, Availability at 18 Months and Production Per Cow”. Archivos Latinoamericanos De Producción Animal 3 (2), 113-30. https://ojs.alpa.uy/index.php/ojs_files/article/view/2923.
Section
Original paper