Abstract
In a study of 900 chicks, both male and female "broiler carcass compositions were altered by dietary amino acid and energy levels at 21 and 56 days of age. Amino acid levels of 80, 100 and 120% of NRC requirements were fed at 3000, 3300, and 36OO kcal ME/kg of diet energy levels, respectively. Carcass moisture levels increased and carcass fat levels decreased with increasing dietary amino acid levels. Carcass protein levels were 15*96 and 18.13% of the carcass (wet weight "basis), carcass ash levels were 2.10 and 2.61%, carcass fat levels were 1*1-.26 and 13.00%, and carcass moisture levels were 6U.9 and 63.60% at 21 and 56 days of age, respectively. Carcass moisture, protein, fat and ash averages were not significantly different (f> .05) between sexes. The average body weight of males was 259 grams heavier than of females at 56 days of age. The palmitic acid content of female carcasses was significantly (P <.05) more (30.65%) than male carcasses (29.56%). Carcasses fed the 120% amino acid level at 36OO kcal ME contained greater percentages of palmitic, stearic, and linoleic acids than the other carcasses. Palmitoleic, oleic and linoleic fatty acid levels were significantly (P £ .05) higher in the neutral lipid fraction than in the polar lipid fraction. The stearic acid level was significantly higher in the polar fraction of both male and female carcasses.
Luther, Lonnie West (1974). Relationships of sex, age, and dietary amino acid to energy levels with carcass composition in Gallus domesticus. Doctoral dissertation, Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -171925.