用于体重超过 100kg 的育肥猪的生长和胴体性能的最佳日粮可消化回肠标准赖氨酸和粗蛋白浓度 1,2。
Optimal dietary standardized ileal digestible lysine and crude protein concentration for growth and carcass performance in finishing pigs weighing greater than 100 kg1,2.
机构信息
Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, Manhattan, KS.
Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS.
出版信息
J Anim Sci. 2019 Apr 3;97(4):1701-1711. doi: 10.1093/jas/skz052.
Three experiments were conducted to determine the optimal dietary standardized ileal digestible (SID) lysine and CP concentrations for finishing pigs over 100 kg BW. In Exp. 1, 253 pigs (DNA 600 × 241, initially 102.0 kg) were used in a 23-d trial with 7 to 8 pigs per pen and 8 pens per treatment. Dietary treatments contained 4 SID lysine concentrations (0.45, 0.55, 0.65, or 0.75%). To formulate the experimental diets, a corn-soybean meal diet with 0.45% SID lysine was formulated without L-lysine HCl. Then, a corn-soybean meal diet containing 0.75% SID lysine was formulated including 0.23% L-lysine HCl. The 0.45 and 0.75% SID lysine diets were blended to provide the 0.55 and 0.65% SID lysine diets. Increasing SID lysine increased (quadratic, P < 0.05) ADG and ADFI with pigs fed 0.55% SID lysine having the greatest final BW. Marginal improvements in gain:feed (G:F; quadratic, P = 0.058) and carcass yield (linear, P = 0.051) and reduction in backfat (quadratic, P = 0.074) were also observed with increasing SID lysine. The quadratic polynomial models predicted maximum ADG and G:F at 0.62 and 0.63% SID lysine, respectively. The broken-line linear model predicted no further improvement in G:F over 0.55% SID lysine. In Exp. 2, 224 pigs (PIC 327 × 1050, initially 109.4 kg) were used in a 20-d trial with 7 pigs per pen and 7 to 8 pens per treatment. Dietary treatments included 4 concentrations of CP (10, 11, 12, or 13%) that were formed by reducing the amount of L-lysine HCl in a corn-soybean meal diet. Increasing CP increased (linear, P < 0.05) ADG and ADFI with the greatest responses observed in pigs fed the diet with 12% CP. Increasing dietary CP also improved (linear, P < 0.05) G:F, final BW, and hot carcass weight (HCW). In Exp. 3, 238 pigs (DNA 600 × 241, initially 111.8 kg) were used in a 26-d trial with 7 to 8 pigs and 6 pens per treatment. Dietary treatments included 5 concentrations of CP (9, 10, 11, 12, or 13%). Increasing CP improved (quadratic, P < 0.05) ADG and G:F with the greatest response observed in pigs fed 13% CP. Increasing CP marginally increased (quadratic, P < 0.074) HCW, with the greatest response observed in pigs fed 12% CP. In conclusion, the SID lysine requirement for pigs from 100 to 122 kg was 0.55 to 0.63% depending on the response criteria with performance maximized with diets containing 12 to 13% CP.
三个实验旨在确定 100 公斤以上育肥猪的最佳饲粮标准回肠可消化赖氨酸和粗蛋白浓度。在实验 1 中，253 头猪（DNA 600×241，初始体重 102.0 公斤）进行了 23 天的试验，每栏 7-8 头猪，每处理 8 个栏。饲粮处理包含 4 种标准回肠可消化赖氨酸浓度（0.45%、0.55%、0.65%或 0.75%）。为了配制实验饲粮，用含有 0.45%标准回肠可消化赖氨酸的玉米-豆粕饲粮配制不含 L-赖氨酸盐酸盐的饲粮。然后，用含有 0.75%标准回肠可消化赖氨酸的玉米-豆粕饲粮配制含有 0.23% L-赖氨酸盐酸盐的饲粮。0.45%和 0.75%标准回肠可消化赖氨酸饲粮混合提供 0.55%和 0.65%标准回肠可消化赖氨酸饲粮。随着标准回肠可消化赖氨酸的增加（二次，P<0.05），ADG 和 ADFI 增加，饲粮 0.55%标准回肠可消化赖氨酸组的猪最终体重最大。采食量（G:F；二次，P=0.058）和胴体产率（线性，P=0.051）的改善和背膘的减少（二次，P=0.074）也随着标准回肠可消化赖氨酸的增加而增加。二次多项式模型预测 ADG 和 G:F 的最大点分别为 0.62%和 0.63%标准回肠可消化赖氨酸。折线线性模型预测在 0.55%标准回肠可消化赖氨酸以上，G:F 不再进一步改善。在实验 2 中，224 头猪（PIC 327×1050，初始体重 109.4 公斤）进行了 20 天的试验，每栏 7 头猪，每处理 7-8 个栏。饲粮处理包括 4 种粗蛋白浓度（10%、11%、12%或 13%），通过减少玉米-豆粕饲粮中 L-赖氨酸盐酸盐的用量来形成。粗蛋白的增加（线性，P<0.05）增加了 ADG 和 ADFI，饲粮 12%粗蛋白组的反应最大。增加饲粮粗蛋白也改善了（线性，P<0.05）G:F、最终体重和热胴体重。在实验 3 中，238 头猪（DNA 600×241，初始体重 111.8 公斤）进行了 26 天的试验，每栏 7-8 头猪，每处理 6 个栏。饲粮处理包括 5 种粗蛋白浓度（9%、10%、11%、12%或 13%）。粗蛋白的增加（二次，P<0.05）提高了 ADG 和 G:F，饲粮 13%粗蛋白组的反应最大。粗蛋白的增加略微增加了（二次，P<0.074）热胴体重，饲粮 12%粗蛋白组的反应最大。总之，100-122 公斤猪的标准回肠可消化赖氨酸需要量为 0.55%-0.63%，具体取决于反应标准，饲粮中含有 12%-13%的粗蛋白可使性能最大化。
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