鄂通两头乌猪生长育肥期能量需要的研究OA

This experiment was conducted to investigate the dietary digestible energy(DE)requirements of Etong two-end balck pigs dur-ing growth(30-65 kg)and fattening(65-90 kg)stages.Twenty-four 120-day-old healthy Etong two-end black pigs with body weight of(35.63±3.43)kg were selected and randomly divided into 3 groups with 8 pigs in each group.The feed digestible energy levels of each group in the growth stage and fattening stage were 13.81 and 13.45 MJ/kg in the control group,13.12 and 12.78 MJ/kg in the experimental group Ⅰ,and 12.43 and 12.10 MJ/kg in the experimental group Ⅱ.The formal test period was 53 and 35 d,respectively.Finally,the pro-duction performance,nutrient apparent digestibility,serum biochemical indexes,carcass traits and meat quality traits were measured,and the appropriate energy level was determined by economic benefit analysis.The results were that,during the growth stage,the average daily gain(ADG)of the Low-Energy Group was significantly higher than that of the Control Group(P＜0.05);that the feed cost per unit weight gain in this group was reduced by 6.30%and 22.40%,compared with the Very-Low-Energy Group and the Control Group,respectively;and that no significant differences were observed among the groups for nutrient apparent digestibility or serum biochemical indices(P＞0.05).During the fattening stage,compared with the Control Group,the Low-Energy and Very-Low-Energy Groups showed no significant differ-ences in growth performance(P＞0.05),but their feed cost per unit weight gain was reduced by 2.93%and 6.36%,respectively.The ap-parent digestibility of crude ash,gross energy,and crude protein in the Low-Energy Group showed no significant difference,compared with the Control Group(P＞0.05);but it was significantly higher than in that the Very-Low-Energy Group(P＜0.05).However,no significant differences were observed among the groups for serum biochemical indices,carcass traits,or meat quality traits(P＞0.05).Based on the comprehensive measurement results and economic benefit analysis,the appropriate levels of digestible energy for Etong two-end black pigs at 30-65 kg and 65-90 kg were 13.12 and 12.78 MJ/kg respectively,which were 5%lower than the energy levels in the national standard.