Progesterone levels in fat-eree milk of cows during post partum period and early pregnancy diagnosis

Authors

  • José Lázaro da Rocha Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP
  • Valquiria Hyppolito Barnabe Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP
  • Renato Campanarut Barnabe Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP
  • Ed Hoffman Madureira Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP
  • Claudio Alvarenga de Oliveira Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP
  • José Antonio Visintin Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP

DOI:

https://doi.org/10.11606/issn.1678-4456.bjvras.1993.52039

Keywords:

Progesterone (milk), Post partum, Pregnancy (diagnosis), Cattle

Abstract

Progesterone concentrations were measured by radioimmunoassay in fat-free milk samples obtained weekly from 26 primiparous, suckling cows, raised in range conditions. Samples were collected in post partum period up to observation of first signs of estrus. Profiles of progesterone concentrations for early pregnancy diagnosis were also examined on milk samples taken 21 days after artificial insemination. Results showed ovarian ciclicity starting 9.89 weeks post partum in crossed Gir x Caracu cows, with 0.28 nmol/1 progesterone on the day of estrus anti 7.62 nmol/1 21 days post Al. In crossed Nelore x Caracu cows, these results were 12.08 weeks, 0.46 nmol/1 and 9.23 nmol/1, respectively. Ten pregnancies out of 12 diagnosed were confirmed by rectal palpation. There was one case of embryo mortality and three AI were practiced during luteal phase. Estrus observation efficiency was 52.94%, since out of 34 heats identified through hormonal determinations, 18 were detected visually. Variations between crossings did not significantly alter progesterone profiles on day of estrus, nor on 21th day after AI or as for ovarian activity post partum.

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Published

1993-12-03

Issue

Section

ANIMAL REPRODUCTION

How to Cite

1.
Rocha JL da, Barnabe VH, Barnabe RC, Madureira EH, Oliveira CA de, Visintin JA. Progesterone levels in fat-eree milk of cows during post partum period and early pregnancy diagnosis. Braz. J. Vet. Res. Anim. Sci. [Internet]. 1993 Dec. 3 [cited 2024 Jul. 20];30(supl.):243-7. Available from: https://www.revistas.usp.br/bjvras/article/view/52039