Abstract
Two experiments were conducted to examine the effect of graded levels of dietary chromium and leucine, and different fat sources on performance and body composition of broiler chickens. The results showed that chromium picolinate at 0.5 ppm significantly (p<0.05) lowered the carcass fat level. Gut weight and carcass water content were increased as a result of chromium treatment. Body weight, plucked weight, carcass weight, abdominal fat pad weight, breast yield and feed efficiency were unaffected by chromium treatment. Leucine did not interact with chromium to effect lean growth. Dietary leucine above the recommended maintenance level (1.2% of diet) markedly (p<0.001) reduced the breast muscle yield. The addition of fish oil to broiler diets reduced (p<0.05) the abdominal fat pad weights compared to birds on linseed diets. Fish oil is believed to improve lean growth through the effects of long chain polyunsaturated fatty acids in lowering the very low-density lipoprotein levels and triglyceride in the blood, in the meantime increasing glucose uptake into the muscle tissue in blood and by minimizing the negative impact of the immune system on protein breakdown. The amount of fat in the diet (2% or 4%) did not affect body composition. (Asian-Aust. J. Anim. Sci. 2005. Vol 18, No. 5 : 692-698)
Highlights
MATERIALS AND METHODSReducing fatness in chicken meat is a current industry goal
Dietary manipulations that may be of practical implications in the poultry industry include using a) chromium as a supplement (Wenk, 1995), b) branched chain fatty acids such as leucine, isoleucine and valine to change muscle protein synthesis (Chua et al, 1979; Morgan et al, 1981), and c) fat sources enriched in n-3 fatty acids and conjugated linoleic acid (Farrell, 1995; Chen and Hsu, 2004)
Two experiments were conducted to examine the potential of manipulating lean tissue deposition of broiler chickens by including different levels of chromium and leucine, and using different types of fats in broiler diets
Summary
ABSTRACT : Two experiments were conducted to examine the effect of graded levels of dietary chromium and leucine, and different fat sources on performance and body composition of broiler chickens. Body weight, plucked weight, carcass weight, abdominal fat pad weight, breast yield and feed efficiency were unaffected by chromium treatment. The addition of fish oil to broiler diets reduced (p
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