Effect of amount and degradability of dietary starch on animal performance and meat quality in beef bulls

Autor: L. O. Fiems, S. De Campeneere, B. G. Cottyn, J. M. Vanacker, B. G. J. D, 'Heer, C.H. V. Boucque
Rok vydání: 1999
Předmět:
Zdroj: Journal of Animal Physiology and Animal Nutrition. 82:217-226
ISSN: 1439-0396
0931-2439
Popis: Introduction Even at a similar energy concentration of the diet, energy source may affect animal performance. O wens et al. (1997) reported that daily dry matter (DM) intake tended to be lowest for wheat-based diets and highest for milo and oat-based diets. O’M ara et al. (1997) found a lower pH and less ammonia in the rumen of lactating cows, when unmolassed beet pulp was replaced with ground wheat. Contrary to the results of O’M ara et al. (1997), M alestein et al. (1984) found a greater risk for lactic acidosis for citrus and beet pulp than for maize meal and tapioca. For years it has been known that rapidly degradable carbohydrates may provoke acidosis (H untington and B ritton 1979; F iems et al. 1993). Furthermore, low ruminal pH may inhibit cellulose digestion (M ould et al. 1983) and decrease efficiency of microbial protein synthesis (R ussell et al. 1979). As energy concentration of the diet is important for finishing cattle (B oucqu& eacute; et al. 1980), the amount of roughage is rather limited. This may result in sub-clinical acidosis with a negative impact on animal performance (O wens et al. 1998), especially when the diet is rich in rapidly fermentable carbohydrates. Therefore an experiment was conducted to investigate the impact of energy source in the finishing diet on voluntary daily feed intake, daily liveweight gain, feed efficiency, blood metabolites and carcass quality. Energy source may also affect meat quality. C asteels et al. (1969) found differences in meat colour when concentrates were based on cereals or sugarbeet pulp. W ood (1984) reported that the concentrate : forage ratio in the diet affects the fatty acid composition of body fat through an increase in propionate production in the rumen. Therefore the effect on meat quality was also studied.
Databáze: OpenAIRE
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