| The trial selected 50 multiparity sows of breeding date, pedigree, age , weight etc. in approaching and average 3-5 births; It grouped high-energy and high-protein, high-energy and low-protein, low-energy and high-protein, low-energy and low-protein, in the light of single factor design of random experiment. Studies on 5-assembly dietary protein and energy levels and it' s effect on productive performance in impregnating sows and suckling sows. The impregnating sows raised 2.5kg everyday and the suckling sows groomed freely. The results means:(1) Synthetical progenitive index of EXP. group 1 and EXP. group 2 were 133. 24 and 119. 78. But the synthetical progenitive index of Control Group, EXP. group-sow 3, EXP. group 4 were 109.53, 116.87 and 97.29. Dietary high-protein and high-energy levels.of sow, especially appending fat-meal, can improve synthetical fertility. It can improve litter-amount, estrus rate, puerperal rate and litter weight of day 28.(2)The sow' s weight of group were even nearly in hybridization, but the sow' s weight of EXP. group 4 were difference evidently with the other group in childbearing(p<0. 05). The sow' s weight of EXP. Group I and EXP. Group 2 were difference evidently with the other group in postnatal day 28(p<0.05). The worked dietary didn' t affect appetite of sow (p>. 05), but the appetite of high-energy EXP. Group were reduced.(3)Dietary protein and energy levels in gestation didn' t affect litter size and Live pigs born (p>0.05). Reducing dietary protein and energy levels affect live pigs at d 21 and live pigs at d 28. Litter wt at day0 of the EXP. Group 3 and the EXP. Group 4 were lowered than the other' s, which differentia were distinct (p<0.05). Litter wt at day 21 and day 28 of the EXP. Group 4 and the Control Group were lowered than the other' s, which differentia were distinct (p<0. 05). Improving dietary protein and energy levels caught increase Litter wt at day 21 and day 28. Compring the control group and the EXP. Group 4, litter wt at day 21 of the EXP. Group1 enhanced 12. 02% and 29. 76%. Compring the control group and the EXP. Group 4, litter wt at day 28 of the EXP. Group 1 enhanced 21.77% and 27.01%.(4) The experimentation indicated that improving dietary protein and energy levels caught promote lactescence of sow and growth of porket. Dietary protein and energy levels in gestation and lactation affected evidently litter ADG (p<0. 05). At day 0 to 21, litter ADG of the EXP. Group 1 were weightier 30.6% than the control group' s (p<0. 05) and litter ADG of the EXP. Group 1 were weightier evidently 43. 53% than the control group' s (p<0. 01), but litter ADG of the EXP. Group 1 didn' t change comparing the EXP. Group 2 and the EXP. Group 3 (p>0.05). At day 21 to 28, litter ADG of the EXP. Group 1 were weightier 14. 02% and 14. 82% than the control group' s and the EXP. Group 3' s (p<0.05) and litter ADG of the EXP. Group 1 were weightier evidently 21. 02% than the EXP. Group 4' s (p<0. 01), but litter ADG of the EXP. Group 1 didn' t change comparing the EXP. Group 2 (p>0. 05). At day 0 to 28, litter ADG of the EXP. Group 1 were weightier 18.35% and 17. 60% than the control group' s and the EXP. Group 3' s (p<0. 05) and litter ADG of the EXP. Group 1 were weightier evidently 35.58% than the EXP. Group 4' s (p<0.01).(5) Dietary protein and energy levels in gestation and lactation didn' t affect survival rate at ablactation (p>0. 05).The results indicated that nutritional needs in gestation were different with it' s in lactation. The nutritional needs in gestation of sow are low-protein, low- aminophenol and high- energy, but the nutritional needs in lactation of sow are high-protein, high-aminophenol, high-energy and high-nutriment. When dietary protein and energy levels in gestation reach CP 14. 03%-15. 51% and DE 12. 4-14. OMJ/kg and dietary protein and energy levels in lactation reach CP 16. 53%-19. 18% and DE 12. 61-14. 07MJ/kg, the productive performance of sow are all right. The total pigs born is 11.5-12.67, live pigs born is 10.25-10.89 and litter...
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