Efecto de la sustitución de parte de la proteína de la dieta por urea, y de parte de la dieta por orujo de oliva, sobre la fermentación ruminal de terneros en cebo intensivo

Abstract:

Eight rumen-fistulated Friesian steers (480±9.3 kg and 324±8.5 days old) were used in a cross-over design with four treatments: a control compound feed based on barley as majority cereal (C), the same control with 20% crude protein (on a dry matter (DM) basis) substituted by urea (U), control with 10% DM substituted by second-extraction pitted and dehydrated olive cake (O10), and control with 20% DM substituted by the same olive cake (O20). Compound feeds were formulated to contribute 14.5-15% crude protein (CP), and were offered ad libitum. Barley straw was used as forage. Samples of rumen liquid were taken, after 15 days of adaptation to the diets, at 0 (just before), 4 and 8 hours after feeding. The pH, and concentrations of ammonia (NH3) and volatile fatty acids (VFA) were determined. No significant differences (P> 0.05) between treatments appeared at any time. However, diet C produced lower proportions of acetic and isovaleric acids, and higher proportions of propionic and valeric acids (P< 0.05), at eight hours post feeding, than diet U. This suggests the possible role of urea as modulator of the acidosis syndrome.

Año de publicación:

2013

Keywords:

Fuente:

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