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Strategies to improve pregnancy per insemination using sex-sorted semen in dairy heifers detected in estrus

Manoel Francisco de Sá Filho H Ayres; R. M Ferreira; Marcilio Nichi; M Fosado; E. P Campos Filho; Pietro Sampaio Baruselli

Theriogenology New York v. 74, n. 9, p. 1636-1642, 2010

New York 2010

Localização: FMVZ - Fac. Med. Vet. e Zootecnia    (BAP - 411 )(Acessar)

  • Título:
    Strategies to improve pregnancy per insemination using sex-sorted semen in dairy heifers detected in estrus
  • Autor: Manoel Francisco de Sá Filho
  • H Ayres; R. M Ferreira; Marcilio Nichi; M Fosado; E. P Campos Filho; Pietro Sampaio Baruselli
  • Assuntos: INSEMINAÇÃO ARTIFICIAL ANIMAL; REPRODUÇÃO ANIMAL; SÊMEN ANIMAL; ESTRO ANIMAL
  • É parte de: Theriogenology New York v. 74, n. 9, p. 1636-1642, 2010
  • Notas: Disponível em: <http://dx.doi.org/10.1016/j.theriogenology.2010.06.036>. Acesso em: 21 jan. 2011
  • Notas Locais: Na FMVZ, ver acervo: BAP-411 Documento Digital;Na FMVZ, ver acervo: Theriogenology, v. 74, n. 9, p. 1636-1642, 2010
  • Descrição: The objective was to improve pregnancy per artificial insemination (P/AI; 35–42 d after AI) in virgin Jersey heifers bred by AI of sex-sorted semen after being detected in estrus. Giving 100 μg of GnRH at first detection of estrus, with AI 12 h later, did not affect P/AI in Experiment I [GnRH = 47.2% (100/212) vs. No GnRH = 51.7% (104/201); P = 0.38] or Experiment II [GnRH = 53.1% (137/258) vs. No GnRH = 48.6% (122/251); P = 0.43]. In these two experiments, estrus detection was done with tail-head chalk or a HeatWatch® system, respectively. In Experiment III, a single insemination dose (2.1 × 106 sperm) 12 h after estrus detection (n = 193), a double dose at 12 h (n = 193), or a double dose involving insemination 12 and 24 h after estrus detection (n = 190) did not affect P/AI (87/193 = 45.1%, 85/193 = 44.0%, and 94/190 = 49.5%, respectively; P = 0.51). However, P/AI was influenced by the number of AI service (First, 115/208 = 55.3%a; Second, 94/204 = 46.1%a; and Third, 57/165 = 34.8%b; P = 0.004). In Experiment IV, the P/AI of heifers inseminated from 12 to 16 h after the onset of estrus (40/106 = 37.7%) was less (P = 0.03) than those inseminated from 16.1 to 20 h (85/164 = 51.8%), and 20.1 to 24 h (130/234 = 55.6%). However, the P/AI for heifers inseminated from 24.1 to 30 h (61/134 = 45.5%) did not differ from that of any other interval. In conclusion, in Jersey heifers inseminated with sex-sorted semen, P/AI was not significantly affected by giving GnRH at detection of estrus or a double insemination dose, but it was higher with AI 16.1 to 24 h vs. 12 to 16 h after the onset of estrus
  • Editor: New York
  • Data de criação/publicação: 2010
  • Formato: p. 1636-1642.
  • Idioma: Inglês
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