Protein and energy relations in the broiler. 3. Growth and in vitro lipid metabolism in male and female chickens used as parent stock.
Growth and in vitro metabolism were assessed in 4 wk-old Ross male and Vedette dwarf female chickens and the offspring of this mating. Chicks were fed diets formulated to contain the same carbohydrate energy level (56% of total metabolizable energy) but different levels of protein (12, 18, 23 and 30%) for 21 days beginning when they were 7 days of age. Dietary regimes were devised to study the role of protein per se in the regulation of growth and in vitro lipogenesis. Dietary protein had little effect on dwarf female growth. Males receiving the diet containing 30% protein and fed ad libitum grew at a slower (P less than .05) rate than did males receiving the 18 or 23% protein diets. A 3-day rotational feeding regime that consisted of three different levels of dietary protein (12, 23 and 30%) did not adversely affect the growth of either males or females when compared to the effect of feeding a 23% protein diet ad libitum. Intermittent feeding decreased (P less than .05) feed consumption and weight gain of both sexes. In vitro hepatic lipogenesis in both males and females was inversely related to the level of protein in the diet being fed; however, the overall lipogenic rate for males was greater (P less than .05) than that for females. Certain liver enzyme activities were also inversely related to the level of dietary protein and the analysis of data suggested that both reducing equivalent (NADPH) production and the malate-alpha ketoglutorate shuttle were also related to dietary protein status.
D000822:Animal Husbandry; D000818:Animals; D001219:Aspartate Aminotransferases / Q000032:analysis; D001823:Body Composition; D001835:Body Weight; D002645:Chickens / Q000254:growth & development* / Q000378:metabolism; D004044:Dietary Proteins / Q000008:administration & dosage*; D004734:Energy Metabolism; D005260:Female; D050356:Lipid Metabolism; D008099:Liver / Q000378:metabolism; D008297:Male; D012737:Sex Factors
D004044:Dietary Proteins; D001219:Aspartate Aminotransferases