Boling S D, Firman J D
Department of Animal Science, University of Missouri-Columbia, 65211, USA.
Poult Sci. 1998 Apr;77(4):547-51. doi: 10.1093/ps/77.4.547.
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% CP, 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.
进行了三项试验，以确定雌性小火鸡育雏期可消化赖氨酸的需要量。在每项试验开始前，给雏鸡饲喂标准玉米-豆粕日粮，然后将其随机分配到不同处理组，每组饲喂2周。日粮处理包括在基础玉米-豆粕日粮中添加不同水平的可消化赖氨酸（1.18%至1.72%），基础日粮的粗蛋白含量分别为21%（试验1）或18.4%（试验2和3）。所有日粮的代谢能含量均为3100至3200千卡/千克。根据用盲肠切除火鸡对玉米和豆粕进行的消化率测定，基础日粮的真可消化赖氨酸含量分别为1.42%（试验1）和1.18%（试验2和3）。处理组中还包括一种阳性对照日粮（粗蛋白含量28%，代谢能3175千卡/千克）用于比较。根据先前的研究和伊利诺伊理想雏鸡蛋白质模式，其他氨基酸与赖氨酸的比例保持在相应水平。折线分析表明，在这些研究中所采用的能量水平下，最佳体重增加所需的可消化赖氨酸需要量为1.32%，最佳料重比所需的可消化赖氨酸需要量为1.34%。
