Dozier W A, Corzo A, Kidd M T, Schilling M W
USDA, Agriculture Research Service, Poultry Research Unit, Mississippi 39762, USA.
Poult Sci. 2008 Jul;87(7):1385-91. doi: 10.3382/ps.2007-00529.
Experiments were conducted to evaluate digestible (dig) Lys requirements of male and female broiler chickens from 49 to 63 d of age. A dose-response diet consisting of corn, soybean meal, and corn gluten meal was formulated to be adequate in dig amino acid concentrations with the exception of Lys. L-Lysine . HCl was added to the dose-response diet to create 7 experimental diets. Concentrations of dig Lys of experimental diets ranged from 0.50 to 1.04% in increments of 0.09%. Variables measured consisted of standardized dietary Lys digestibility, feed intake, dig Lys intake, BW gain, feed conversion, mortality, abdominal fat weight and percentage, carcass weight and yield, and total breast meat weight and yield. In experiment 1, dig Lys of the dose-response diet was determined as 0.51% with cecectomized roosters. In experiment 2, dig Lys requirements of male broilers for BW gain, feed conversion, breast meat weight, and breast meat yield were 0.86, 0.88, 0.90, and 0.90%, respectively, based on 95% of the responses. From 49 to 63 d of age, male broilers optimized growth and meat yield measurements with approximately 3.0 g of dig Lys intake. In experiment 3, dig Lys requirements of female broilers were estimated as 0.79 and 0.83%, respectively, for BW gain and feed conversion. Digestible Lys intake necessary to optimize growth performance was 2.8 g/bird during 49 to 63 d of age. These results indicate that dig Lys requirements for male broilers were 0.87 and 0.90% of the diet, respectively, for growth performance and breast meat yield. Conversely, the dig dietary Lys requirement for females was 0.81% based only on growth performance.
开展试验以评估49至63日龄雄性和雌性肉鸡的可消化赖氨酸（dig Lys）需要量。配制了一种由玉米、豆粕和玉米蛋白粉组成的剂量反应日粮，使其除赖氨酸外的可消化氨基酸浓度充足。向该剂量反应日粮中添加L-赖氨酸·盐酸盐以制备7种试验日粮。试验日粮的可消化赖氨酸浓度范围为0.50%至1.04%，增量为0.09%。所测量的变量包括标准化日粮赖氨酸消化率、采食量、可消化赖氨酸摄入量、体重增加、饲料转化率、死亡率、腹脂重量和百分比、胴体重量和产率，以及胸肉总重量和产率。在试验1中，用盲肠切除公鸡测定剂量反应日粮的可消化赖氨酸为0.51%。在试验2中，基于95%的反应，雄性肉鸡体重增加、饲料转化率、胸肉重量和胸肉产率的可消化赖氨酸需要量分别为0.86%、0.88%、0.90%和0.90%。在49至63日龄期间，雄性肉鸡摄入约3.0克可消化赖氨酸可优化生长和肉产量指标。在试验3中，雌性肉鸡体重增加和饲料转化率的可消化赖氨酸需要量分别估计为0.79%和0.83%。在49至63日龄期间，优化生长性能所需的可消化赖氨酸摄入量为每只鸡2.8克。这些结果表明，雄性肉鸡生长性能和胸肉产率的日粮可消化赖氨酸需要量分别为日粮的0.87%和0.90%。相反，仅基于生长性能，雌性肉鸡日粮可消化赖氨酸需要量为0.81%。
