Capsaicin (CAP), a pungent principle of hot pepper, enhanced the energy metabolism of rats through the beta-adrenergic action of CAP itself. The present study was done to clarify the effects of dietary red pepper on feeding behavior, abdominal fat content and laying performance in laying hens. Single Comb White Leghorn laying hens were given diets containing varying levels of red pepper (0, 2 and 10g/kg diet) ad libitum for 10 weeks. The red pepper contains 0.22% CAP. There were no significant differences in feeding behavior in any treatments. This suggests that the receptor for the pungent stimuli might be deficient in chickens. The abdominal fat content and liver color were not altered by dietary red pepper, being implied that the beta-adrenergic action of CAP might be smaller in chickens than in mammals. Laying performances were hardly influenced by dietary red pepper. Roche color fan score and the redness of egg yolk color significantly increased as the dietary red pepper content increased, but the reverse was true for the yellowness and lightness of egg yolk color. In conclusion, it is difficult to depress the excess fat deposition of laying hens by dietary red pepper through the action of CAP. Dietary red pepper is only available for the egg yolk pigmentation, particularly in redness.
Male and female broilers were given diets (6 males and 6 females per diet) containing varying percentages of sorbose (0, 3, 6, and 9%) and fed for ad libitum access from 28 to 56 days of age. Body weight gain and feed intake were decreased with increasing dietary sorbose, particularly in male birds fed diets containing 9% sorbose, although feed efficiency and N retention rate were not influenced by dietary treatments. Absolute and relative abdominal fat weights were higher in females than in males and decreased with the increasing levels of dietary sorbose in both sexes. Fat content in the pectoral muscle also decreased as dietary sorbose increased. Dietary sorbose did not have significant effects on serum glucose, triglyceride, total cholesterol, low density lipoprotein, very low density lipoprotein, and chylomicron levels in either male or female birds. The ME values of diets decreased as dietary sorbose increased. Palmitic acid content of abdominal fat was significantly lower in birds fed the 9% sorbose diet than in birds fed the control diet. The reverse was true for linoleic acid content. It was concluded that dietary sorbose can be used as a potential regulator of lipid deposition in broilers.
1. The effect of dietary sorbitol on the performance of broilers was investigated. Male and female broilers were given a control diet or a sorbitol diet (100 g/kg diet) ad libitum from 29 to 57 d of age. 2. Body weight gain, food intake, food efficiency and the ME values of the diets were not significantly different. Absolute and relative weights of abdominal fat were significantly reduced in birds given the sorbitol diet. 3. Compared to the control diet, the diet containing sorbitol lowered the serum glucose, total cholesterol and very low density lipoprotein concentrations.
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