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Xylanase--complex efficacy in high-energy diet for bulls finished in feedlot/Eficiencia do complexo xilanase em dietas de alta energia para touros terminados em confinamento

Enzymes can be an interesting additive in high energy diets for feedlot cattle. However, literature is inconsistent on this subject. Thus, this study was conducted to evaluate animal performance of feedlot bulls receiving high energy diet, composed of a mixture of 85% whole corn grain and 15% protei...

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Published in:Acta scientiarum. Animal sciences 2018-01, Vol.40 (1)
Main Authors: Neumann, Mikael, Leao, Guilherme Fernando Mattos, Vigne, Gabriela Leticia Dalai, Santos, Leslei Caroline dos, Venancio, Bruno Jose, Dochwat, Andre
Format: Article
Language:English
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Summary:Enzymes can be an interesting additive in high energy diets for feedlot cattle. However, literature is inconsistent on this subject. Thus, this study was conducted to evaluate animal performance of feedlot bulls receiving high energy diet, composed of a mixture of 85% whole corn grain and 15% proteinmineral-vitamin nucleus, without or with xylanase included in the diets. Diets consisted of: CON--diet without enzymes (Control) and ENZ--diet with enzymes (5 g animal [day.sup.-1]). Thirty-two bulls were used, with an average age of 11 [+ or -] 2 months, average initial weight of 365 [+ or -] 5 kg, and finished for 119 days in feedlot. The experimental design was completely randomized, consisting of two treatments and eight replications, where each replication was represented by a stall with two animals. ENZ increased the weight gain (1.69 vs. 1.33 kg [day.sup.-1]) and improved the feed conversion (4.60 vs. 6.03 [kg.sup.-1]) in the adaptation period of the animals. Animals receiving ENZ increased 1.65% of carcass yield and were 7.57% more efficient in the conversion of dry matter consumed into carcass gain in relation to CON. Carcass traits of feedlot-finished bulls were not altered by inclusion of enzymes. Xylanase-complex could increase efficiency in feedlot bulls. Keywords: beef cattle, feed additive, ruminant nutrition. As enzimas podem ser aditivos interessantes em dietas de alta energia para gado em confinamento. No entanto, a literatura e inconsistente para este assunto. Assim, este trabalho foi realizado para avaliar o desempenho de touros em confinamento com dietas de alta densidade energetica, composto apenas de uma mistura de 85% de graos de milho inteiros e 15% de nucleo proteico-vitaminico-mineral, com ou sem inclusao de enzimas a base de xilanase. Os tratamentos foram CON--dieta sem enzimas (controle) e ENZ--dieta com enzimas (5 g animal [dia.sup.-1]). Foram utilizados 32 touros, com idade media de 11 [+ or -] 2, peso inicial medio de 365 kg [+ or -] 5 e terminados por 119 dias. O delineamento experimental foi inteiramente casualizado, consistindo em dois tratamentos e oito repeticoes, em que cada repeticao foi representada por uma baia com dois animais. ENZ aumentou o ganho de peso (1,69 vs. 1,33 kg [dia.sup.-1]) e melhorou a conversao alimentar (4,60 vs. 6,03 [kg.sup.-1]) na fase de adaptacao dos animais em confinamento. Os animais que receberam ENZ aumentaram 1,65% do rendimento de carcaca e foram 7,57% mais eficientes na transformacao da mate
ISSN:1806-2636
DOI:10.4025/actascianimsci.v40i1.37321