Adeola O, Lawrence B V, Cline T R
Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.
J Anim Sci. 1994 Aug;72(8):2061-7. doi: 10.2527/1994.7282061x.
The availabilities of lysine and threonine in soybean meal for 10- to 20-kg pigs were determined in two experiments using slope-ratio methodology. In the first experiment, a basal diet formulated to contain 6 g of lysine/kg, but adequate in all other amino acids, was supplemented with 1, 2, or 3 g of lysine/kg from either soybean meal or L-lysine-HCl. Each of the seven diets was available on an ad libitum basis to six individually penned pigs (barrows:gilts, 1:1) from an initial weight of 9.9 kg until they reached a live weight of 20.8 kg. Daily feed intake was similar among diets. Common-intercept multiple linear regression of daily live weight gain and gain:feed ratio on dietary lysine level indicate slope ratios (soybean meal:lysine.HCl) of .85 and .88, respectively. In Exp. 2, a basal diet formulated to contain 4 g of threonine/kg was supplemented with .65, 1.30, 1.95, or 2.60 g of threonine/kg from either soybean meal or L-threonine. Each of the nine diets was available on an ad libitum basis to six individually penned pigs (barrows:gilts, 1:1) from 9.9 to 21.0 kg live weight. As in Exp. 1, daily feed intake was similar among the nine diets. The slope ratios (soybean meal:L-threonine) from common-intercept multiple regression analyses were .73 and .78 for daily weight gain and gain:feed ratio, respectively. Thus, the availabilities of lysine and threonine in soybean meal for young pigs were estimated to be 85 to 88% and 73 to 78%, respectively.
采用斜率比法在两项试验中测定了豆粕中赖氨酸和苏氨酸对10至20千克猪的可利用性。在第一个试验中，配制一种基础日粮，使其含赖氨酸6克/千克，而其他所有氨基酸含量充足，再分别从豆粕或L-赖氨酸盐酸盐中添加1、2或3克赖氨酸/千克。七种日粮中的每一种都随意提供给6头单栏饲养的猪（公猪：母猪，1:1），初始体重9.9千克，直至达到活重20.8千克。各日粮之间的日采食量相似。日增重和增重：饲料比相对于日粮赖氨酸水平的共同截距多元线性回归表明，斜率比（豆粕：赖氨酸盐酸盐）分别为0.85和0.88。在试验2中，配制一种基础日粮，使其含苏氨酸4克/千克，再分别从豆粕或L-苏氨酸中添加0.65、1.30、1.95或2.60克苏氨酸/千克。九种日粮中的每一种都随意提供给6头单栏饲养的猪（公猪：母猪，1:1），活重从9.9千克增至21.0千克。与试验1一样，九种日粮之间的日采食量相似。共同截距多元回归分析得出的日增重和增重：饲料比的斜率比（豆粕：L-苏氨酸）分别为0.73和0.78。因此，估计豆粕中赖氨酸和苏氨酸对幼猪的可利用性分别为85%至88%和73%至78%。
