Efeito do flushing e de cruzamentos sobre a produção de cordeiros e desempenho de ovelhas Santa Inês

• Ano de defesa: 2006
• Autor(a) principal: Fernando Henrique Melo Andrade Rodrigues de Albuquerque
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; Brasil; VET - DEPARTAMENTO DE ZOOTECNIA; Programa de Pós-Graduação em Zootecnia; UFMG
• Palavras-chave em Português: Cordeiro; Reprodução; Alimentação e rações; Peso ao nascer; Produção animal
• Link de acesso: http://hdl.handle.net/1843/31917

The effects of flushing over Santa Inês ewes submitted to different periods of supplementation were evaluated in the present study. Hundred eighty adult ewes were divided into three groups of 60 dams each. Each group was given the flushing for a different period: Group F0sem- no supplementation; Group F3sem- supplementation during the three weeks before the breeding season; Group F6sem- supplementation during the three weeks before and during the first three weeks of the breeding season. Beyond flushing, the effect of crossbreeding over Santa Inês productivity were evaluated: Santa Inês x Santa Inês, Dorper x Santa Inês, and Pitangui x Santa Inês. Three breeding season groups were formed with 60 ewes each, being 20 ewes by each flushing group previously established. The parameters evaluated were fertility, litter size, total lamb weight per ewe, total lamb weight per ewe on 35 and 70 days of age, total lamb weight per ewe weight on 35 and 70 days of age, lamb weight at birth, at 35, and at 70 days of age, and lamb survival from birth until 70 days of age. The flushing management did not affect the parameters evaluated, only the dams from F6sem group showed lowest productivity (lamb weight at birth) (P<0,05). The litter size influenced ewes body condition at lambing, what reflected on the lambs weight at birth, their survival, and performance until weaning. Considering the three ram genotypes, the ewes bred with the Pitangui ram showed lowest lamb weight production. The Pitangui crossbred lambs were lighter than the other genotypes evaluated at 70 days of age. The pure Santa Inês lambs showed lowest survival (p<0,05).