饲粮能量、蛋白质水平及赖能比对早期断奶仔猪生产性能的影响

采用三因素二次回归正交组合设计，研究了能量（ＤＥ：３－０ ～３－８Ｍｃａｌ／ｋｇ） ，粗蛋白质水平（ＣＰ：１５％ ～２５％ ） 与赖能比［（Ｌｙｓ∶ＤＥ） ：０－６ ～１－２（ｇ．Ｌｙｓ）／（ ＭＪ．ＤＥ）］ 对２８ 日龄断奶仔猪（ 长白×汉梅） 的日增重（ＡＤＧ） ，饲料转化率（Ｆ／Ｇ） 、日采食量（ＡＤＦＩ） ，血浆尿素氮（ＰＵＮ） 及血浆游离赖氨酸的影响，试验期４２ｄ。结果表明：能量、蛋白质水平及赖能比对仔猪生产性能均有影响（ Ｐ＜ ０－０１ ） ，其中以赖能比的作用最重要。仔猪２８ ～６０ 日龄（５ ～１５ｋｇ） 与６０ ～７０ 日龄（１５～２０ｋｇ）的ＡＤＧ、ＡＤＦＩ、Ｆ／Ｇ 及７０ 日龄的ＰＵＮ 均随能量、蛋白质水平及赖能比的改变呈显著二次曲线变化。２８～６０ 日龄，随能量、蛋白质水平及赖能比增加，ＡＤＧ 和Ｆ／Ｇ 改善；６０～７０ 日龄能量水平为３－４ Ｍｃａｌ／ｋｇ 左右，ＡＤＧ 和Ｆ／Ｇ 达最佳，高于此水平ＡＤＧ 和ＡＤＦＩ下降，Ｆ／Ｇ 增大。在试验条件下，根据影响规律将仔猪营养需要划分为２８～６０ 日龄与６０ ～７０ 日龄两阶段，２８ ～６０ 日龄与６０～７０ 日龄获得最佳生产性能的能量、蛋白质水平及赖能比（ 赖氨酸） 需要量分别为：

The Effect of Dietary Energy, Protein Levels and Lysine: Energy Ratio on Performance of Early-weaned Pigs

Fifty one crossbred pigs weaned on 28 days of age with 5 02±0 24kg of body weight, were used to study the effect of dietary digestible energy (DE: 3 0～3 8Mcal/Kg), crude protein (CP: 15%～25%) and Lysine: energy ratio [(Lys∶DE): 0 6～1 2(g.Lys)/(MJ.DE)] on postweaning performance of pigs with 3 factor quadratic regression right cross design. The results and regression anaLysis are showed as the follows: ①DE, CP levels and Lys∶DE has significant (P<0 01) effect on performance of early weaned pigs, of which Lys∶DE is the most important factor; ②As increased in DE, CP level and Lys∶DE, average daily gain (ADG), average daily feed intake (ADFI), Feed/Gain (F/G) and plasma ures nitrogen (PUN) change quadratically (P<0 01 of P<0 05) of 28～60 days and 60～70 days; ③Before 60 days of age, ADG increases and F/G decreases with an increase in DE, CP level and Lys∶DE. But after 60 days of age, ADG decreases and F/G increases as DE increases up to about 3 4Mcal/kg; ④It is recommended that for pigs weighing 5～20kg be divided into two stages of 5～15kg and 15～20kg. Pigs weighing 5～15kg, 15～20kg can achieve the best performance when the dietary levels of DE, CP and Lys∶DE are 3 80Mcal/kg, 25 0%, 0 96(g.Lys)/(MJ.DE)(1 52%Lys), 3 36Mcal/kg, 25%, 0 96(g.Lys)/(MJ.DE)(1 54%Lys), respectively. ADG and F/G reach 343g/d, 1 261 for pigs weighing 5～15kg and 593 9g/d, 1 480 for those weighing 15～20kg.