Taxa de concepção de vacas leiteiras submetidas à inseminação artificial em tempo fixo em diferentes épocas do ano
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Data
2014-08
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Resumo
The objective of the present study was to assess the influence of season of the year on conception
rate of different categories of milking cows submitted to fixed time artificial insemination (FTAI). The cows were divided
into the following categories: high production multiparous (MA), low production multiparous (MB) and high production
primiparous cows (PA). The conception rate was compared between the cows inseminated in the period with mild
temperatures (TA) and in the period with higher temperatures (TE), within each animal category. The following FTAI
protocol was used for all the animals: D0 – progesterone implant, 2 mg of estradiol benzoate, D8 – progesterone implant
removal, 0.15 mg of cloprostenol sodium, 300 UI of equine chorionic gonadotropin, 1 mg of estradiol cypionate; D10 –
0.004 mg of buserelin acetate and artificial insemination 48 hours after removing the implant. Pregnancy was diagnosed at
30 and 60 days after FTAI and the data was analyzed by the Exact Fisher test. There was no statistical difference in the
conception rate of the cows inseminated at different seasons of the year in any categories analyzed. The season of the year
did not interfere in the conception rate of high production multiparous cows, low production multiparous cows and high
production primiparous cows.
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Palavras-chave
Estação do ano, Lactação, Prenhez, Lactation, Pregnancy, Season of the year
Citação
SILVA, Natalia do Carmo et al. Taxa de concepção de vacas leiteiras submetidas à inseminação artificial em tempo ixo em diferentes épocas do ano. Bioscience Journal, Uberlândia, v. 30, n. 4, p. 1177-1182, jul./ago. 2014.