Ministry of Agriculture Feed Industry Centre, State Key Laboratory of Animal Nutrition, China Agricultural University, Beijing 100193, China.
J Anim Sci Biotechnol. 2012 Mar 1;3(1):9. doi: 10.1186/2049-1891-3-9.
A total of 2,121 growing-finishing pigs (Duroc × Landrace × Large White) were utilized in six experiments conducted to determine the effects of different ratios of standardized ileal digestible lysine (SID-Lys) to metabolizable energy (ME) on the performance and carcass characteristics of growing-finishing pigs. Exps. 1 (30 to 50 kg), 2 (52 to 70 kg) and 3 (81 to 104 kg) were conducted to find an optimum ME level and then this level was used in Exps. 4 (29 to 47 kg), 5 (54 to 76 kg) and 6 (84 to 109 kg) to test the response of pigs to different ratios of SID-Lys:ME. In Exps.1 to 3, four treatments were used consisting of diets with a formulated ME content of 3.1, 3.2, 3.3 or 3.4 in Exps. 1 and 2 while Exp. 3 used 3.05, 3.15, 3.25 or 3.35 Mcal/kg. A constant SID-Lys:ME ratio of 2.6, 2.3 or 2.0 g/Mcal was used in Exps. 1, 2 and 3, respectively. Weight gain was significantly increased with increasing energy level in Exp.1 while weight gain was unaltered in Exps. 2 and 3. For all three experiments, feed intake was decreased (P < 0.05) and feed efficiency was improved (P < 0.05) with increasing energy level. Tenth rib back fat thickness linearly increased (P < 0.05) with increasing energy level. In Exps. 4 to 6, five treatments were used consisting of diets with a SID-Lys:ME ratio of 2.4, 2.6, 2.8, 3.0 or 3.2 in Exp. 1, 2.1, 2.3, 2.5, 2.7, 2.9 or 3.2 in Exp. 2 and 1.8, 2.0, 2.2, 2.4, or 2.6 in Exp. 3. A constant ME level 3.2, 3.2 and 3.05 Mcal/kg was used in Exps. 1, 2 and 3, respectively (selected based on the results of weight gain). For all three experiments, weight gain increased (P < 0.05) and feed efficiency improved linearly (P < 0.05) as the SID-Lys:ME ratio increased. Tenth rib back fat thickness linearly decreased (P < 0.05) as the SID-Lys:ME ratio increased. Based on a straight broken-line model, the estimated SID-Lys:ME ratio to maximize weight gain was 3.0, 2.43 and 2.2 for 29 to 47, 54 to76 and 84 to 109 kg of pigs, respectively.
共有 2121 头生长育肥猪（杜洛克×长白×大白）用于 6 项实验，以确定不同标准化回肠可消化赖氨酸（SID-Lys）与代谢能（ME）比例对生长育肥猪生产性能和胴体特性的影响。实验 1（30 至 50 公斤）、2（52 至 70 公斤）和 3（81 至 104 公斤）旨在找到最佳 ME 水平，然后在实验 4（29 至 47 公斤）、5（54 至 76 公斤）和 6（84 至 109 公斤）中检验猪对不同 SID-Lys：ME 比例的反应。在实验 1 至 3 中，使用了四种处理方法，包括实验 1 和 2 中 ME 含量分别为 3.1、3.2、3.3 或 3.4 的配方日粮，而实验 3 使用了 3.05、3.15、3.25 或 3.35 Mcal/kg 的 ME。在实验 1、2 和 3 中，分别使用了恒定的 SID-Lys：ME 比例为 2.6、2.3 或 2.0 g/Mcal。在实验 1 中，随着能量水平的增加，增重显著增加，而在实验 2 和 3 中，增重未发生变化。随着能量水平的增加，所有三个实验的采食量均减少（P < 0.05），饲料效率提高（P < 0.05）。第十肋骨背膘厚度随能量水平线性增加（P < 0.05）。在实验 4 至 6 中，使用了五种处理方法，包括实验 1 中 SID-Lys：ME 比例为 2.4、2.6、2.8、3.0 或 3.2 的日粮，实验 2 中 SID-Lys：ME 比例为 2.1、2.3、2.5、2.7、2.9 或 3.2 的日粮，实验 3 中 SID-Lys：ME 比例为 1.8、2.0、2.2、2.4 或 2.6 的日粮。在实验 1、2 和 3 中，分别使用了 3.2、3.2 和 3.05 Mcal/kg 的恒定 ME 水平（根据增重结果选择）。在所有三个实验中，随着 SID-Lys：ME 比例的增加，增重增加（P < 0.05），饲料效率线性提高（P < 0.05）。第十肋骨背膘厚度随 SID-Lys：ME 比例的增加而线性下降（P < 0.05）。根据直线折线模型，29 至 47、54 至 76 和 84 至 109 公斤猪的最大增重 SID-Lys：ME 比估计分别为 3.0、2.43 和 2.2。
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