FR 29. Reproductive response of crossbred heifers (Bos indicus x Bos taurus) used as bovine embryo recipient in Venezuelan tropic. I. Racial type

• Noris Roa ^[2] ; Tiburcio Linares ^[1] ; Diego Barrios ^[2] ; Rita Tamasaukas ^[3] ; Morella de Rolo ^[2]
  1. [1] Universidad Central de Venezuela

     Universidad Central de Venezuela

     Venezuela

     
  2. [2] INIA, Ceniap, Venezuela
  3. [3] UNERG, San Juan de los Morros, Venezuela

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• 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
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• Resumen

  • To evaluate reproductive response and early diagnosis of pregnancy in venezuelan tropic, plasma Progesterone (P4) concentrations were determined by Enzyme Linked Immunosorbent Assay (ELISA) in 47 crossbred (Bos indicus x Bos taurus) recipient heifers in a commercial embryo transfer (ET) program in savanna area of Monagas state, Venezuela. Pregnancy status was confirmed by rectal palpation 60 days after oestrus. Pregnancy rates were 38.3% (18/47) while a 61.7 % stayed open. Simple linear regression and one way analysis of variance indicated that there were not significant differences (P>.05) between plasma P4 concentrations of females which remained pregnant and those which did not on either days 0 (estrus) or 7 (ET). On day 21, the mean ± SD concentrations of P4 in pregnant females was 12.2 ± 2.2 ng/mL being significantly higher (P