Levels of digestible isoleucine on performance, carcass traits and organs weight of gilts (15 - 30 KG)

Ciência e Agrotecnologia

Leandro Dalcin Castilha²  Paulo Cesar Pozza¹  Ricardo Vianna Nunes¹  Doglas Batista Lazzeri¹  Marcelo Luiz Somensi¹  Magali Soares Dos Santos Pozza¹ 

[1] ,Universidade Estadual de MaringáMaringá PR ,Brasil

关键词: Swine nutrition;    branched chain amino acids;    nutritional requirements;    carcass composition;    Nutrição de suínos;    aminoácidos de cadeia ramificada;    exigências nutricionais;    composição de carcaça;   

DOI  :  10.1590/S1413-70542012000400009

来源: SciELO

【 摘 要 】

The ideal protein concept for pigs has allowed reducing levels of crude protein in the diet, since synthetic amino acids are included because the branched chain amino acids may be limiting. In order to determine the digestible isoleucine requirement for gilts from 15 to 30 kg, a performance assay was accomplished, using 40 crossbreed gilts of high genetic potential, averaging 15.00 ± 0.52 kg of body weight, alloted in a randomized blocks design, consisting of five treatments (0.45, 0.52, 0.59, 0.66, 0.73% of digestible isoleucine), four replicates and two animals per experimental unit. Performance traits were determined and at the end of the experiment one animal per experimental unit was slaughtered to determine carcass composition and organs weight. Levels from 0.45 to 0.73% of digestible isoleucine did not affect the carcass traits and organs weight of gilts from 15 to 30 kg. A quadratic effect (P<0.05) of digestible isoleucine levels on isoleucine efficiency for weight gain was observed, that increased up to 0.506% digestible isoleucine, which ratio of digestible isoleucine: lysine was 0.51.

【 授权许可】

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