eficiência bionutricional de animais nelore e seus mestiços com simental e aberdeen angus, em duas dietas bio-nutritional efficiency of nellore and nellore crosses with angus and simmental under two diets

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ID: 192781
2001
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Abstract
Este experimento foi realizado por dois anos com o objetivo de avaliar o desempenho de animais de diferentes potenciais de crescimento,Nelore (N), ½ Angus - ½ Nelore (AN), ½ Simental - ½ Nelore (SN). Este estudo faz parte de um projeto amplo, que tem a finalidade de avaliar a eficiência de produção de carne em sistemas de produção compostos por animais de diferentes tamanhos adultos (Projeto Cruzamento Embrapa 1). A partir de uma análise bivariada envolvendo as variáveis ganho de peso e consumo de matéria seca, determinou-se a primeira função discriminante canônica, que foi utilizada para se estimarem índices de desempenho aqui denominados de eficiência bionutricional. Foram avaliados 72 animais em duas dietas, uma constituída de feno de capim-tanzânia mais 600 g de grão de soja moído fornecido à vontade (dieta A) e outra, constituída de feno adicionado de um concentrado (dieta B). A eficiência bionutricional foi influenciada significativamente pela interação grupo genético (GG) e dieta (D). As comparações entre as médias foram conduzidas pelos contrastes: C1) Nelore versus média dos mestiços e, C2) ½ Angus - ½ Nelore versus ½ Simental - ½ Nelore, na dieta B e; C3) Nelore versus mestiços e C4) ½ Angus - ½ Nelore versus ½ Simental - ½ Nelore na dieta A. Independente da dieta, os animais Nelore apresentaram pior desempenho do que a média verificada para os animais "meio-sangue". As eficiências bionutricionais médias foram 429,74 e 490,46 para Nelore e mestiços, respectivamente, na dieta B e, na mesma seqüência, 299,70 e 376,10, na dieta A. Os desempenhos dos F1s foram dependentes da dieta. Na dieta A, os animais "meio-sangue" Angus-Nelore e Simental-Nelore apresentaram a mesma eficiência bionutricional (376,10), enquanto na dieta B, os ½ Angus - ½ Nelore foram superiores (529,84 versus 451,09).
This experiment was carried out for two years with the objective of evaluating the performance of genetic groups with different genetic potentials for growth, such as Nellore (N), ½ Angus - ½ Nellore (AN) and ½ Simmental - ½ Nellore (SN).This study is part of an ample project, which has as principal goal, to evaluate the efficiency of production of systems composed by animals with different mature sizes (Projeto cruzamento Embrapa 1). Using a bivariate analysis involving the variables average daily gain and dry matter intake, it was determined the first discriminant canonical function which was used for estimating performance indexes that were denominated bio-nutritional efficiency. The data were obtained from 72 animals under two diets, one composed by Tanzânia hay plus 600 g of ground soybean (diet A), provided ad libitum, and other where this hay was combined with a concentrate ration (diet B). The bio-nutritional efficiency was significantly affected by the interaction between genetic group (GG) and diet (D). Thus, the least square means were compared by four different contrasts. These contrasts were, on diet B: C1) Nellore versus average of crossbreds and, C2) ½ Angus - ½ Nellore versus ½ Simmental - ½ Nellore. And on diet A: C3) Nellore versus crossbreds and, C4) ½ Angus - ½ Nellore versus ½ Simmental - ½ Nellore. The analyses of these contrasts revealed that, independently on diet, Nellore animals had a worst performance than the average observed for the F1s. The average of bio-nutritional efficiencies were equal to 429.74 and 490.46 for Nellore and crossbred animals, respectively, on diet B and, in the same sequence, 299.70 and 376.10 on diet A. Relatively to the F1 animals, their performances were dependent on diet. On diet A, the ½ Angus - ½ Nellore and ½ Simmental - ½ Nellore presented the same bio-nutritional efficiency (376.10) while on diet B, the ½ Angus - ½ Nellore were superiors (529.84 versus 451.09).
Reference Key
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Authors ;Kepler Euclides Filho;Valéria Pacheco Batista Euclides;Geraldo Ramos de Figueiredo;Rodrigo Amorim Barbosa
Journal european journal of lipid science and technology
Year 2001
DOI
10.1590/S1516-35982001000100013
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982001000100013
Keywords
beef cattle feeding crossbreeding

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