| Eighty replacement gilts which average weight was 50+ 1.2kg were used in this test, and they had better body condition and were second hybridization sows. They were grouped AN Ek C\ D by using random grouping test method. Corn, soybean and fish meal were mainly utilized to compound basic diet. All testing sows were fed basic diet which other nutrition elements wre identical, and energy concentration were different, they were grouped 3400kcal/kg(A), 3200kcal/kg(B)^ 3000kcal/kg(C)> 2800kcal/kg(D) DE, and gradient difference was 200kcal/kg. Contrasted group were not designed, and all groups were testing group in this test and used the contrasts among groups in testing group. This test were divided two times to apply(test One and test Two). There were eighty testing sows in test One. Time of test One was one hundred days, and time of preparing test was ten days and time of formal test was ninety days. Initial weight was applied to empty body weight in the early days of formal test. Final weight was applied to empty body weight in the end of test One. Feed consumption was 17784kg in the whole test stage. Feed intake was calculated empty body weight for each group, and obtained efficiency of feed utilization, and the whole reproductive organs, which were gained by dissecting were weighted. The results of development for organs were obtained by liveweight gain. The testing sows were forty in test Two. The time of test Two was twenty-eight days. Sows entered delivery room in one week before farrowing. The weight of parturition of sows was applied to weight in one day before farrowing. The first day of parturition was thebeginning of the formal test. The weight of postpartum of sows was applied to weight in the end of parurition. The placeta were collected to weight in the postpartum. Birth litter weight of piglets were calculated after their birth. Sows were secondly weighted in the end of suckling period, and weightlessness was observed. The amount of lactaion was determined in the suckling period by using the method of "weight-suckle-weight". The piglets were weighted before eating milk and after eating milk. The amount of lactation and energy digestibility were obtained by the value of live weight gain. The formula 110 # BW0.75 was utilized to calculate energy requirement.1. The different energy concentration influenced efficiency of feed utilization of replacement giltsThe efficiency of feed utilization of group AI were not obviously different with group B!(P>0.05),and were obviously defferent with group C\ (P<0.05),and extremely different with group D| (P<0.01).This result showed that the effect of group B] was best, and group A] % Q % D^ had a rised trend contrasted to group B\. This result also showed that high energy couldn't rise the utilization efficiency, but lower energy could reduce it, and they were positive correlation.2. The different energy concentration influence the development of reproductive organs.The replacement gilts were fed diffenent energy concentration before breeding. The growth and development of their reproductive organs were not obviously different (P>0.05), but the results showed that lower energy could reduce growth and development of reproductive organs.3. The different energy concentration influence weightlessness of sows.The weightlessness of sows among groups were obviously different (P>0.05) in the suckling period. The weightlessness of every group was distinguishly 6.5kg (A2), 9.2kg(B2), 12.6kg(C2)and 18.3kg(D2). The results proved that lower energy concentration could rise the weightlessness of nursing sows.4. The different energy concentration influence the amount of lactationThe group A2 were obviously different with group B2 (P<0.05),and extremely different with groupC2 and groupD2(P<0.01). The amount of lactation of every group were distinguishly 333.90kg(A2)> 314.58kg(B2)>281.26kg(C2)and 245.7kg(D2). The results proved that higher energy concentration could rise the amount of lactation, and they were positive correlation. |
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