%0 Journal Article
%T Fontes prot¨¦icas e energ¨¦ticas com diferentes degradabilidades ruminais para vacas em lacta  o = Protein (raw or rosted soybeans) and energy (coursely ground or steamflaked corn) sources with varying ruminal degradabilities for lactating cows
%A ¨¦berson de Castilho Barnab¨¦
%A Fl¨¢vio Augusto Portela Santos
%A Carla Maris Machado Bittar
%A Alexandre Vaz Pires
%J Acta Scientiarum : Animal Sciences
%D 2007
%I 
%X O objetivo deste trabalho foi avaliar a combina  o de fontes de energia e prote¨ªna com diferentes degradabilidades ruminais. Foram utilizadas quatro vacas mult¨ªparas (23 kg leite dia-1) em Quadrado Latino 4 x 4 com arranjo fatorial 2 x 2: duas fontes de prote¨ªna (soja crua ou tostada) e duas de energia (milho mo¨ªdo, grosso oufloculado). O tratamento com milho mo¨ªdo grosso e soja tostada resultou em maior consumo de mat¨¦ria seca (p < 0,11). O fornecimento de milho floculado apresentou tend¨ºncia (p = 0,12) de aumento da produ  o e diminui  o do teor de gordura no leite. A tostagem do gr o de soja n o melhorou (p > 0,05) o desempenho lactacional. A tostagem da soja e a flocula  o do milho diminu¨ªram (p < 0,01) as concentra  es ruminais de Namoniacal. Animais que receberam milho floculado apresentaram maiores concentra  es totais de AGV (p = 0,10), mas n o houve efeito no pH ruminal. Observou-se maiordigestibilidade ruminal (p = 0,06) quando se forneceu soja crua. The objective of this trial was the evaluation of ruminal degradation synchrony of protein and energy sources. Four Holstein cows (23 kg day-1) were used in a 4 x 4 Latin Square design and 2 x 2 factorial arrangement: two protein (raw vs. roasted soybeans) with two energy sources (coarsely ground vs. steam-flaked corn). Dry matter intake was higher for cows fed coarsely ground corn with roasted soybean (p < 0.11). Flaking of corn tended (p = 0.12) to increase milk yield and to decrease milk fat content. Roasted soybean did not improve lactational performance of mid lactating cows (p > 0.05). Rumen pH was not affected by treatments (p > 0.05). Both roasted soybeans and flaking of corn decreased rumen ammonia nitrogen (p < 0.01). Animal fed steamflaked corn tended showed higher total VFA molar concentrations (p = 0.10), but there were no treatments effect on ruminal pH. A higher (p = 0.06) ruminal starch digestibility was observed for raw soybean treatment.
%K prote¨ªna
%K amido
%K sincroniza  o
%K produ  o de leite
%K protein
%K starch
%K synchronization
%K milk yield
%U http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/238/183