Productive traits of Santa Inês and Morada Nova ewes mated with Dorper rams in Southeastern Brazil
Keywords:
Brazilian naturalized breed, lambing weight, sheepAbstract
Naturalized Brazilian hair breeds are adapted to tropical climate, however produce lambs for slaughter with lower performance and carcass traits. One way to increase productiveness comprises the use of adapted ewes crossed with specialized meat breeds, exploiting the complementarity between breeds and heterosis for sustainable lamb production. Dorper rams can be use to produce crossbred lambs with better performance traits. The aim of this study was to evaluate the weight at birth and at 30 days of Morada Nova lambs (MN) and Santa Inês (SI) straight breed or Dorper crossbred. The study was carried out at Instituto de Zootecnia, city of Nova Odessa, located in São Paulo State, Brazil. Forty-two adult Santa Inês (SI) ewes with 51.8 ± 7.1 Kg of initial body weight, with 21 mated with SI rams and 21 mated with Dorper (DO) rams and 38 Morada Nova (MN) with 33.1 ± 4.98 with 19 mated with MN and 19 mated with DO rams were used. During pregnancy the ewes were reared on intensive grazing systems with rotational grazing on Aruana grass (Panicum maximum cv. Aruana), plus corn silage ad libitum and a concentrate mixture (400 g/day) with 16% crude protein and 80% of total digestible nutrient (TDN) on final third of gestation. After lambing, the ewes were kept in collective pens and kept under the same diet used in late pregnancy. The weight at birth as well as at 30 day old were recorded and calculated the percentage of lamb weight in relation of ewe weights. Statistical analyses were performed using SPSS software version 12. Based on data is possible to observe that the SI X DO lambs had the highest birth weight followed by the straight breed SI and MN. At 30 day, the SI lambs had greater live weight than MN lambs. No difference was found for lamb´s weights in relation to ewe€™s weight. We conclude that SI crossbred or straight breed lambs are heavier than MN ones.Downloads
Downloads
Published
Issue
Section
License
Os autores não serão remunerados pela publicação de trabalhos, pois devem abrir mão de seus direitos autorais em favor deste periódico. Por outro lado, os autores ficam autorizados a publicar seus artigos, simultaneamente, em repositórios da instituição de sua origem, desde que citada a fonte da publicação original seja Boletim de Indústria Animal. A revista se reserva o direito de efetuar, nos originais, alterações de ordem normativa, ortográfica e gramatical, com vistas a manter o padrão culto da língua e a credibilidade do veículo. Respeitará, no entanto, o estilo de escrever dos autores. Alterações, correções ou sugestões de ordem conceitual serão encaminhadas aos autores, quando necessário. Nesses casos, os artigos, depois de adequados, deverão ser submetidos a nova apreciação. As opiniões emitidas pelos autores dos artigos são de sua exclusiva responsabilidade. Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob a Licença Creative Commons Attribution (CC-BY-NC). A condição BY implica que os licenciados podem copiar, distribuir, exibir e executar a obra e fazer trabalhos derivados com base em que só se dão o autor ou licenciante os créditos na forma especificada por estes. A cláusula NC significa que os licenciados podem copiar, distribuir, exibir e executar a obra e fazer trabalhos derivados com base apenas para fins não comerciais.
