FR 13. Effect of ninety six-hour calf removal on estrus induction and fertility in crossbred aciclic cows

• Eleazar Soto-Belloso ^[1] ; German Portillo ^[1] ; Lilido Ramirez ^[2] ; Gustavo Soto ^[1] ; Nidia Rojas ^[1] ; Roberto Cruz-Arambulo ^[1]
  1. [1] La Universidad del Zulia

     La Universidad del Zulia

     Venezuela

     
  2. [2] Universidad de Los Andes (Venezuela)

     Universidad de Los Andes (Venezuela)

     Venezuela

     
• Localización: Archivos Latinoamericanos de Producción Animal, ISSN 1022-1301, ISSN-e 1022-1301, Vol. 5, Nº. Extra 3, 1997 (Ejemplar dedicado a: Proceedings XV ALPA meeting 2)
• Idioma: inglés
• Enlaces
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• Resumen

  • A study was conducted to determine the effect of 96 h calf removal on estrus induction and fertility in crossbred cebu aciclic cows suckled twice a day. Cows in moderate (3) to good (4) body condition and over 120 days postpartum were alloted to two groups, CD, with calf removal (n=34) and SD, without calf removal (n=30). Aciclic condition was determined by RIA progesterone measure in milk samples twice a week from day 90 to 120 postpartum. Only cows with progesterone values below 0.5 ng/mL were considered for the study. The percentage of cows showing estrus were CD = 67.6 % (n=23) and SD = 26.6 % (n=8) (P .001) indicating a good level of fertility in cows bred during the first estrus after calf removal. The mean interval between calf removal and estrus was 12.9 ± 8.19 and 19.1 ± 11.4 days for groups CD and SD respectively. The result of this study indicated that 96 h calf removal could be considered an effective way to shorten the calving interval in crossbred cebu cows in the tropics.