Abstract
Two experiments were conducted to study the effect of 20% brewers dried grains (BDG), 10 to 20% distillers dried grains (DDGS), and 10% distillers dried solubles (DDS) in equicaloric-equifat and isonitrogenous corn-soy diets on hepatic lipid accumulation in caged layers. To assess the effect of dietary fat on liver fat, a low fat (3.3%) diet was compared to the high-fat basal.Experiment 1 was conducted in a controlled environment house for 8 weeks. Inclusion of fermentation by-products reduced (P<.05) relative liver weight (g/kg body weight) and liver lipid. Plasma lipid and cholesterol and performance were not altered by the diets (P>.05). Experiment 2 was conducted in summer in an open-sided house for 9 weeks with the same treatments. The results were similar to the first experiment except that liver hemorrhages were observed in the hens not fed fermentation by-products. Birds fed 20% BDG or DDGS had lower (P≤.05) liver fat than those fed 10% DDGS or DDS. In both experiments dietary fat had no significant effect on liver fat content or performance.The results of the study demonstrate the effectiveness of brewers and distillers fermentation by-products in controlling liver lipid accumulation in caged layers fed equicaloric-equifat and isonitrogenous corn-soy diets. This response is not related to the level of dietary fat and appears to be induced by an intrinsic nutritional property of these by-products.
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