关键词: 仔猪, 能量, 蛋白质, 赖氨酸, 赖能比, 生产性能

Abstract: 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.

Key words: PIGLETS, DIGESTIBLE ENERGY, PROTEIN, LYSINE, Lys:DE, PERFORMANCE