本试验旨在研究日粮消化能（DE）和真可消化赖氨酸（true digestible Lys）含量对初产母猪妊娠前期（配种～妊娠第84天）生产性能、妊娠物组成和血液激素水平的影响，得出初产母猪妊娠前期能量和赖氨酸的适宜需要量。试验采取二因子（DE和true digestible Lys）4水平饱和D-最优回归设计，选取7-8月龄、体重为（123.26±5.69）kg的渝荣Ⅰ号CB系后备母猪36头，随机分为6组，每组6个重复，每个重复1头猪。单栏限喂饲养，分别饲以6种不同DE和真可消化赖氨酸水平的日粮，试验期84 d。试验结果显示：母猪妊娠前期，随着DE水平和真可消化赖氨酸水平的提高，母体增重有增加的趋势；提高DE水平显著降低母猪妊娠第84天时的活仔数（P<0.05），极显著地提高了死胎和木乃伊数（P<0.01）；DE和真可消化赖氨酸水平不会影响妊娠物总重以及胎儿、胎盘和子宫的粗蛋白质、粗脂肪和氨基酸的含量（P>0.05）；妊娠前期母猪血清中孕酮含量随DE水平的提高而降低，胰岛素含量随DE水平的提高而增加，DE和真可消化赖氨酸水平不会对血清中促黄体素的浓度产生影响（P>0.05）。研究结果提示：为提高初产母猪的窝重，妊娠前期日粮中DE和真可消化赖氨酸的推荐含量为12.50 MJ/kg和0.69%。

The experiment was conducted to study the effects of digestible energy (DE) and true digestible lysine (Lys) on performance, composition of gestation tissue and hormone levels of primiparous sows during early gestation (mating-on day 84 of gestation), and to find out optimal requirement for energy and Lys content of primiparous sows during early gestation. The best saturate-D regressive design of 2 factors (DE and true digestible Lys) and 4 levels was employed, and thirty-six at 7-8-month-old CB line sows of Yurong Ⅰ multiple cross system with average weight of (123.26±5.69) kg were allocated to 6 groups with 6 replicates of 1 sow. The sows were penned individually with restricted feeding, and the experiment lasted for 84 days. The results showed that maternal body gain tend to be increased with DE and true digestible Lys increasing during early gestation. Ascending DE levels significantly decreased the number of live litter (P<0.05) and increased the number of dead fetus and mummy foetus on day 84 of gestation (P<0.01). There were no significant effects of DE and true digestible Lys on gross weight of gestation tissue, and content of crude protein, ether extract and amino acides (P>0.05). During early gestation, concentration of progesterone in serum of sows declined, while concentration of insulin rised with DE increasing; both of DE and true digestible Lys content had no effects on the concentration of luteinizing hormone in serum (P>0.05). In conclusion, the proper content of DE and the true digestible Lys during early gestation was 12.50 MJ/kg and 0.69% for litter weight of primiparous sows.［Chinese Journal of Animal Nutrition, ２００9，２1（5）:625-633］