Digestibilidade total e parcial e fluxo de nutrientes em cabras leiteiras alimentadas com diferentes fontes protéicas / Total and partial digestibility and fluxes of nutrients in dairy goats fed with different sources of proteins

AUTOR(ES)

Nivea Regina de Oliveira Felisberto

DATA DE PUBLICAÇÃO

2007

RESUMO

Diets formulated with protein sources presenting different resistance to ruminal degradation were compared by evaluating intake, total and partial digestibility, nitrogen balance, fluxes of nutrients to omasum, production and microbial efficiency and ruminal parameters in goats. Eight rumen cannulated non-lactating, non- pregnant goats were distributed in a 4 x 4 Latin square design with two repeats. Treatments consisted of four diets where different source of plant protein account for the major protein source named soybean meal (SM), roasted soybean (RS), corn gluten meal (CGM), and cottonseed cake (CC). No difference was found as both intake and apparent digestibility of dry matter and nutrients were compared among diets. Reduction of ruminal digestibility for dry matter, crude protein and non fiber carbohydrates by using ration with RS, CGM and CC. Biological values and true digestibility for diets were similar. Amount of rumen protein were similar among rations, however fluxes of dry matter, protein and non fiber carbohydrate to omasum were higher for rations using roasted soybean, corn gluten meal and cottonseed cake. Ammonia nitrogen concentration was higher for ration with soybean meal as major protein source. Values of pH higher values were obtained for rations with RS and CC. Regarding kinetic of transit similar values were found among rations. Rations containing RS, CGM and CC as major protein source presented degradability smaller than diet using soybean meal as the major source of protein, but no difference among rations were found as availability and use by animals were compared. Diets with protein sources presenting reduced ruminal degradation do not compromised the bacterial growth, increasing flux of nutrients to omasum. Although pH and rumen ammonia are altered no compromise is observed in both production and microbial efficiency as those sources are used for dairy goats, which grant their use with similar efficiency to rations using source of more degradable protein.

ASSUNTO(S)

produção microbiana caprinos ph microbial production ph nutricao e alimentacao animal valor biológico goat biological values taxa de passagem ruminal degradation degradação ruminal

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