Effects of environmental factors on multiple ovulation of zebu donors

• Published in: Arquivo brasileiro de medicina veterinária e zootecnia 2006-08, Vol.58 (4), p.567-574
• Main Authors: Peixoto, M.G.C.D.(Embrapa - Gado de leite), Bergmann, J.A.G.(UFMG Escola de Veterinária), Fonseca, C.G.(UFMG Instituto de Ciências Biológicas), Penna, V.M.(UFMG Escola de Veterinária), Pereira, C.S.(UFMG Escola de Veterinária)
• Format: Article
• Language: eng ; por
• Subjects: bovino; cattle; efeitos de meio; environmental effects; MOET nucleus; núcleo MOET; superovulation; superovulação; VETERINARY SCIENCES; Zebu
• ISSN: 0102-0935; 1678-4162; 1678-4162; 0102-0935
• DOI: 10.1590/S0102-09352006000400019

Data on 1,294 superovulations of Brahman, Gyr, Guzerat and Nellore females were used to evaluate the effects of: breed; herd; year of birth; inbreeding coefficient and age at superovulation of the donor; month, season and year of superovulation; hormone source and dose; and the number of previous treatments on the superovulation results. Four data sets were considered to study the influence of donors elimination effect after each consecutive superovulation. Each one contained only records of the first, or of the two firsts, or three firsts or all superovulations. The average number of palpated corpora lutea per superovulation varied from 8.6 to 12.6. The total number of recovered structures and viable embryos ranged from 4.1 to 7.3 and from 7.3 to 13.8, respectively. Least squares means of the number of viable embryos at first superovulation were 7.8 ± 6.6 (Brahman), 3.7 ± 4.5 (Gyr), 6.1 ± 5.9 (Guzerat) and 5.2 ± 5.9 (Nellore). The numbers of viable embryos of the second and the third superovulations were not different from those of the first superovulation. The mean intervals between first and second superovulations were 91.8 days for Brahman, 101.8 days for Gyr, 93.1 days for Guzerat and 111.3 days for Nellore donors. Intervals between the second and the third superovulations were 134.3, 110.3, 116.4 and 108.5 days for Brahman, Gyr, Guzerat and Nellore donors, respectively. Effects of herd nested within breed and dose nested within hormone affected all traits. For some data sets, the effects of month and order of superovulation on three traits were importants. The maximum number of viable embryos was observed for 7-8 year-old donors. The best responses for corpora lutea and recovered structures were observed for 4-5 year-old donors. Inbreeding coefficient was positively associated to the number of recovered structures when data set on all superovulations was considered. Informações de 1.294 superovulações de fêmeas das raças Brahman, Gir, Guzerá e Nelore foram estudados para avaliar a influência de: raça; rebanho; ano de nascimento, coeficiente de endogamia e idade da doadora; mês, estação e ano da superovulação; e dose do hormônio utilizado; e número de tratamentos prévios sobre o desempenho reprodutivo na Ovulação Múltipla e Transferência de Embriões (MOET). Quatro arquivos de dados foram usados para estudar o efeito de eliminação das doadoras após cada superovulação consecutiva, cada um contendo apenas registros da primeira, ou duas primeiras, ou três