Use of cutin for determining apparent digestibility of diets in horses / Uso da cutina na estimativa da digestibilidade aparente de dietas para eqüinos

AUTOR(ES)

Renata Farinelli de Siqueira

DATA DE PUBLICAÇÃO

2008

RESUMO

This research aimed to compare organic matter digestibility coefficient (OMDC) of diets composed of alfalfa cubes, alfalfa cubes with soybean oil, alfalfa hay and alfalfa hay with soybean oil by total feces collection and use the internal markers cutin and acid detergent lignin (ADL) and the external marker chromic oxide. Four male weanling horses (approximately 10-months old, 197.25 kg BW average) were used in a 4 x4 Latin Square design. Evaluation of OMDC estimated by markers was performed by a model considering the bias, i.e., the difference between OMDC estimated by marker and by total feces collection. It was evaluated accuracy, precision and robustness of those three markers. The cutin overestimated the OMDC and showed to be the less accurate and precise. The chromic oxide underestimated the OMDC and its recovery was low, but it was the most precise. The ADL recovery did not differ from 100% and it was the most accurate, therefore the most appropriated marker for this kind of diet.

ASSUNTO(S)

digestibility horses indicadores acurácia cutin eqüinos precision cutina markers accuracy precisão

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