Digestible lysine requirement of female turkeys during the starter period
1998
Boling, S.D. | Firman, J.D.
Three experiments were conducted to determine the digestible lysine requirement of female turkey poults during the starter period. Birds were fed a standard corn-soybean meal diet until the onset of each trial and were then randomly assigned to treatments that were fed for 2 wk. Dietary treatments included titrated levels of digestible lysine (1.18 to 1.72%) added to a basal corn-soybean meal diet with an intact crude protein content of either 21% (Experiment 1) or 18.4% (Experiments 2 and 3). All diets contained 3,100 to 3,200 kcal MEn/kg. True digestible lysine contents of the basal diets were 1.42% (Experiment 1) and 1.18% (Experiments 2 and 3), based on digestibility assays of corn and soybean meal with cecectomized turkeys. A positive control diet (28% CF, 3,175 kcal MEn/kg) was also included in the treatments for comparison. Other amino acids were maintained at levels in relation to lysine based on previous research and the Illinois Ideal Chick Protein. Broken-line analysis suggests that the digestible lysine requirement is 1.32% for optimum body weight gain and 1.34% for optimal feed:gain at the energy levels used in these studies.
显示更多 [+] 显示较少 [-]