Friesen K G, Nelssen J L, Goodband R D, Tokach M D, Unruh J A, Kropf D H, Kerr B J
Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506-0201.
J Anim Sci. 1994 Jul;72(7):1761-70. doi: 10.2527/1994.7271761x.
One hundred eight high-lean-growth gilts (34.4 kg BW) were used to determine the dietary lysine requirement to maximize growth, carcass characteristics, and protein accretion from 34 to 72.5 kg BW. The experiment was a randomized complete block design; initial BW served as the blocking factor. Six dietary treatments were included, ranging from .54 to 1.04% (.10% increments) digestible lysine (.69 to 1.25% total lysine). Pigs were housed in pens of three, with six replicate pens per treatment. Pig weights and feed consumption were collected weekly to calculate ADG, ADFI, and gain:feed (G/F). Initially, five pigs were slaughtered to determine baseline carcass composition. When the mean weight for pigs in a pen reached 55 and 72.5 kg, one pig per pen was randomly selected and slaughtered for carcass measurements. The right side of each carcass was ground twice and sampled to determine carcass composition and tissue accretion rates. Average daily gain was increased by dietary lysine from 34 to 55 kg (linear, P < .01), from 55 to 72.5 kg (linear, P < .10), and from 34 to 72.5 kg (linear, P < .01). Although ADFI from 34 to 55 and from 55 to 72.5 kg was not influenced by dietary lysine, ADFI for the entire experiment tended to decrease (quadratic, P < .10) as digestible lysine increased. Increased dietary lysine resulted in improved G/F from 34 to 55 kg (linear, P < .01) and from 55 to 72.5 and 34 to 72.5 kg (quadratic, P < .01). Average backfat thickness was not influenced by dietary lysine at 55 kg but decreased (linear, P < .05) as dietary lysine increased at 72.5 kg. At 55 kg, longissimus muscle area was larger (linear, P < .05) for gilts fed increased digestible lysine. However, longissimus muscle area was similar for all treatments at 72.5 kg. Gilts fed increased digestible lysine had greater CP accretion from 34 to 55 kg (linear, P < .01), 55 to 72.5 kg (linear, P < .05; quadratic, P < .10), and from 34 to 72.5 kg (quadratic, P < .05). Based on the feed intake observed in this study, the high-lean-growth gilt requires at least 22 g/d total lysine intake from 34 to 72.5 kg to maximize CP accretion.
选用108头高瘦肉生长型后备母猪（体重34.4千克）来确定日粮赖氨酸需要量，以实现体重从34千克增长至72.5千克期间生长性能、胴体特性和蛋白质沉积最大化。试验采用随机完全区组设计，初始体重作为区组因素。试验设6种日粮处理，可消化赖氨酸含量从0.54%至1.04%（增量0.10%）（总赖氨酸含量从0.69%至1.25%）。猪每3头饲养在一栏中，每个处理设6个重复栏。每周记录猪的体重和采食量，以计算平均日增重（ADG）、平均日采食量（ADFI）和料重比（G/F）。最初，屠宰5头猪以确定胴体组成基线。当栏内猪的平均体重达到55千克和72.5千克时，每个栏随机选择1头猪进行屠宰以测定胴体指标。每个胴体的右侧进行两次研磨并采样，以确定胴体组成和组织沉积率。日粮赖氨酸可使34至55千克体重阶段的平均日增重提高（线性，P<0.01），55至72.5千克体重阶段提高（线性，P<0.10），34至72.5千克体重阶段提高（线性，P<0.01）。虽然34至55千克和55至72.5千克体重阶段的平均日采食量不受日粮赖氨酸影响，但整个试验期间平均日采食量随可消化赖氨酸增加呈下降趋势（二次曲线，P<0.10）。日粮赖氨酸增加可使34至55千克体重阶段的料重比提高（线性，P<0.01），55至72.5千克和34至72.5千克体重阶段提高（二次曲线，P<0.01）。55千克体重时，日粮赖氨酸对平均背膘厚无影响，但72.5千克体重时，平均背膘厚随日粮赖氨酸增加而降低（线性，P<0.05）。55千克体重时，饲喂较高可消化赖氨酸的后备母猪的背最长肌面积更大（线性，P<0.05）。然而，72.5千克体重时，所有处理的背最长肌面积相似。饲喂较高可消化赖氨酸的后备母猪在34至55千克（线性，P<0.01）、55至72.5千克（线性，P<0.
