Institute of Animal Science, Guangdong Academy of Agricultural Sciences, State Key Laboratory of Livestock and Poultry Breeding, Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural Affairs, Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou, China.
CJ International Trading Co., LTD, Shanghai, China.
J Anim Sci. 2020 Sep 1;98(9). doi: 10.1093/jas/skaa261.
The present study investigated the effect of optimizing the total dietary arginine (Arg)-to-lysine (Lys) ratios on the metabolism of lactating sows and piglet performance by supplementation with l- Arg during lactation. A total of 200 multiparous sows (three to six parities, Yorkshire × Landrace) were selected and randomly and equally assigned to five groups in lactation, and finally, 36, 34, 35, 36, and 33 dams completed the study in the dietary treatments, respectively, where the diets consisted of five step-up Arg-to-Lys ratios (0.9, 1.0, 1.1, 1.2, and 1.3) by the addition of 0%, 0.10%, 0.20%, 0.30%, and 0.40% Arg. The diets contained 3.37 to 3.38 Mcal of digestible energy/kg energy, 17.73% to 17.75% crude protein, and 0.98% to 1.01% Lys and were fed ad libitum during lactation. The performance of sows and suckling piglets was measured, and plasma and milk samples were collected for analysis. The feed intake of sows as well as litter weight gain during lactation increased linearly (P ≤ 0.05), while maternal backfat and milk composition were not affected (P > 0.05) as the dietary Arg-to-Lys ratios increased. Analyzed plasma biochemical indices, including concentrations of free Arg, Orn, and Glu, and prolactin, insulin, and follicle-stimulating hormone, responded linearly (P ≤ 0.05) to increases in dietary Arg-to-Lys ratios. The dietary Arg-to-Lys ratios of 1.01 and 1.02 were optimal for maternal feed intake and litter weight gain, based on broken-line models. Collectively, the results of this study indicate that increasing total dietary Arg-to-Lys ratios in lactation was beneficial for the performance of lactating sows and suckling piglets, and dietary Arg-to-Lys ratios of 1.01 and 1.02 were optimal, from regression analyses, for the practical feeding of lactating sows.
本研究通过在哺乳期补充 l-精氨酸，探讨了优化总日粮精氨酸（Arg）与赖氨酸（Lys）比值对泌乳母猪代谢和仔猪性能的影响。选择了 200 头经产母猪（三至六胎次，约克夏 × 长白），并在哺乳期随机均分为五组，最终，在日粮处理中，分别有 36、34、35、36 和 33 头母猪完成了研究，其中日粮由添加 0%、0.10%、0.20%、0.30%和 0.40%Arg 的 5 种逐步升高的 Arg 与 Lys 比值组成。日粮含有 3.37 至 3.38 Mcal 的可消化能量/千克能量，17.73%至 17.75%粗蛋白和 0.98%至 1.01%Lys，哺乳期自由采食。测量母猪和哺乳仔猪的性能，并收集血浆和乳样进行分析。随着日粮 Arg 与 Lys 比值的增加，母猪的采食量以及哺乳期窝重呈线性增加（P ≤ 0.05），而母体背膘和乳成分不受影响（P > 0.05）。分析血浆生化指标，包括游离 Arg、Orn 和 Glu 浓度以及催乳素、胰岛素和促卵泡激素，均呈线性增加（P ≤ 0.05），这与日粮 Arg 与 Lys 比值的增加有关。基于折线模型，日粮 Arg 与 Lys 比值为 1.01 和 1.02 时，母猪采食量和窝重增加最佳。综上所述，本研究结果表明，哺乳期增加总日粮 Arg 与 Lys 比值有利于泌乳母猪和哺乳仔猪的性能，从回归分析来看，日粮 Arg 与 Lys 比值为 1.01 和 1.02 时，最适合泌乳母猪的实际饲养。
