Periódicos Brasileiros em Medicina Veterinária e Zootecnia

p. 01-05

Efeito do mês de parição na taxa de gestação subsequente e no peso ao desmame dos bezerros de vacas Nelore

Cunha Carneiro, LuísaCristina do Carmo Silva, JosianePacheco Mendes, GabrielaCristina Ferreira, IsabelMaria dos Santos, Ricarda

Background: The concentration of births in the most appropriate time (months) of the year results in uniform lots of calves and allows the adoption of different management practices, aimed at reducing mortality and increasing the weaning weight. The aim of this study was to evaluate the effect of the month of calving on subsequent pregnancy rate and weaning weight of calves from Nelore cows during the birth season.Materials, Methods & Results: Were used 91 Nellore cows between three and ten years, belonging from Experimental Farm Capim Branco, Uberlandia, Minas Gerias, Brazil, from August 2008 to May 2009. The birth season lasted 110 days and occurred from 09/17/2008 to 01/05/2009 (110 days), that period being divided into four months: 1 (9/17 to 16/10), 2 (10/17 to 11/16), 3 (11/17 to 12/16) and 4 (12/17 to 01/05). On the day of birth, calves (males and females) were weighed in analog scale, and then, between the sixth and seventh months of life (months to weaning) were weighed again. The next breeding season was held from 12/05/2008 to 03/05/2009, lasted 90 days. Eleven days before the beginning of the breeding season, the cows that had more than 30 days postpartum (DPP) and body condition score equal to or greater than 2.50 were submitted through a time artificial insemination protocol (TAI). Pregnancy diagnosis was performed in cows with 28 to 32 days of insemination. N

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