Friesen K G, Nelssen J L, Unruh J A, Goodband R D, Tokach M D
Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506-0201.
J Anim Sci. 1994 Apr;72(4):946-54. doi: 10.2527/1994.724946x.
One hundred twenty pigs (initially 44 kg BW) were used to determine effects of the interrelationship between genotype, sex, and dietary lysine on growth performance and carcass composition in a 2 x 2 x 2 factorial arrangement. Genetic comparisons were made between pigs characterized with either a high or medium potential for lean tissue gain. Within genotype, barrows and gilts were separately fed either a .90 or .70% lysine diet until the mean weight of pigs in each pen of three reached 104 kg. One pig per pen was slaughtered to determine carcass characteristics and chemical composition. From 104 to 127 kg, dietary lysine was lowered to .75 or .55% for pigs fed .90 or .70% dietary lysine, respectively. When the pigs' mean weight met or exceeded 127 kg, both pigs were slaughtered to determine carcass characteristics and chemical composition. Carcass length, longissimus muscle area, average backfat thickness, and 10th rib fat depth were measured 24 h postmortem on the chilled carcasses. The right side of each carcass was then ground and chemically analyzed to determine protein and lipid accretion rates. No interactions were detected from 44 to 104 kg; therefore, main effect means will be discussed. At 104 kg, high-lean pigs had increased ADG (P < .01) and gain:feed ratio (G/F; P < .05) compared with medium-lean pigs. Barrows had increased (P < .05) ADG and ADFI but exhibited a poorer (P < .01) G/F than gilts. Pigs fed .90% lysine had improved (P < .01) ADG compared with pigs fed .70% lysine.(ABSTRACT TRUNCATED AT 250 WORDS)
120头猪（初始体重44千克）被用于通过2×2×2析因设计来确定基因型、性别和日粮赖氨酸之间的相互关系对生长性能和胴体组成的影响。对具有高或中等瘦肉组织生长潜力的猪进行了遗传比较。在每个基因型内，将公猪和母猪分别饲喂含0.90%或0.70%赖氨酸的日粮，直至每栏三头猪的平均体重达到104千克。每栏宰杀一头猪以确定胴体特征和化学成分。从104千克到127千克，分别将饲喂0.90%和0.70%日粮赖氨酸的猪的日粮赖氨酸降低至0.75%和0.55%。当猪的平均体重达到或超过127千克时，将两头猪都宰杀以确定胴体特征和化学成分。在冷却的胴体宰后24小时测量胴体长度、背最长肌面积、平均背膘厚度和第10肋处脂肪深度。然后将每个胴体的右侧进行研磨并进行化学分析，以确定蛋白质和脂肪的沉积率。在44千克至104千克阶段未检测到交互作用；因此，将讨论主效应均值。在104千克时，与中等瘦肉型猪相比，高瘦肉型猪的平均日增重（ADG）增加（P<0.01），料重比（G/F；P<0.05）提高。公猪的ADG和日均采食量（ADFI）增加（P<0.05），但G/F比母猪差（P<0.01）。与饲喂0.70%赖氨酸的猪相比，饲喂0.90%赖氨酸的猪的ADG有所改善（P<0.01）。（摘要截断于250字）
