Redução de proteínas com suplementação de aminoácidos em dietas para leitões desmamados aos 21 dias de idade

• Autor(a) principal: Girôtto Júnior, Celso José
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5644
• topic: Aminoácidos essenciais; Pós-desmame; Proteína ideal; Essential amino acids; Postweaning; Ideal protein; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL::AVALIACAO DE ALIMENTOS PARA ANIMAIS

A 21-d experiment with 126 pigs was conducted to evaluate growth performance, weight of liver, pancreas and spleen, morph-physiological conditions of the small intestine, and, and diarrhea occurrence of nursery pigs fed different levels of crude protein. Pigs (6.05 ± 0.35 kg of initial weight) were allotted in pens with three pigs each on day 21 after weaning, with six treatments, and seven blocks on a randomized blocks experimental design. The treatments were six corn-soybean meal based diets with decreased levels of crude protein (24%; 23%; 22%; 21%; 20%; and 19%). Increased levels of synthetic amino acid were added to the diets in order to keep the ratio between lysine and each one of the following amino acids constant (methionine + cystine, threonine, tryptophan, valine, and isoleucine). Lactose levels were the same in all diets. Decreasing levels of crude protein from 24% to 19% did not influence daily gain (P>0.05), average daily feed intake (P>0.05), feed:gain (P>0.05) and carcass weight (P>0.05).. At the end of experimental period, one animal of each treatment was slaughtered for pH measurement of the content in the stomach and duodenum, relative weight of the liver, pancreas and spleen, villi height and crypt depth of the duodenum, jejunum and ileum. Effects (P<0.05) on duodenum pH were observed, but not in the stomach pH. The treatments did not influence the villi height and crypt depth (P>0.05), the weight of liver and spleen (P>0.05) but (P>0.05). No diarrhea occurrence was observed. In conclusion, decreasing levels of crude protein in nursery diets from 24% to 19% does not affect the performance of the piglets, the weight of organs, and the morph- physiological parameters of the gastrointestinal tract of piglets weaned at 21 days of age through 42 days of age.