不同饲养方案对猪生产性能及猪肉品质的影响

研究了不同饲养方案对猪生产性能和猪肉品质的影响。试验共分 4个处理 :处理 1,对照 ,按常规饲养标准饲养 ;处理 2 ,按组装新方案饲养 (生长期添加 2 0 0 μg/kg的酵母铬 ,肥育期添加 2 0 0mg/kgVE ,且肥育期饲粮能量浓度在对照组基础上降低 0 4Mcal/kg、蛋白质降低 2 % ) ;处理 3,90 %对照饲粮 +10 % (按风干基础计 )青饲料 ;处理 4 ,90 %新方案饲粮 +10 % (按风干基础计 )青饲料。每个处理 5个重复 ,每个重复 1头猪。 2 0头 2 0kg左右的长白×约克杂交生长猪 ,按体重大小随机分配到各个处理组中。试验至 10 0kg左右体重结束。猪自由饮水和采食。结果表明 :①饲喂适量青饲料能显著降低猪的背膘厚和提高瘦肉率 (P <0 0 5 )。按风干基础计 ,用青饲料替代 10 %基础饲粮 ,使背膘厚降低 2 0 0 %～ 2 3 0 %、瘦肉率提高 4 0 %～ 4 5 % ;②饲喂适量青饲料有降低猪肉滴水损失和提高肉品风味的作用 ,背最长肌中次黄嘌呤核苷含量提高 6 0 %～ 8 0 % ;③生长期补充 2 0 0 μg/kg的酵母铬对生产性能无影响 ,有改善眼肌面积和瘦肉率的趋势 ,对其它屠宰性能指标和肉质参数无影响 ;④肥育期添加 2 0 0mg/kg的VE对肉色、pH值及滴水损失等肉质指标无影响 ;⑤肥育期适当降低饲粮能量和蛋白质水平对提高瘦肉率和降低

Effects of Different Feeding Regimens on Growth Performance and Meat Quality of Growing-Finishing Pigs

This study was intended to investigate the effect of different feeding regimens on growth performance and meat quality of growing finishing pigs. 20 Landrace×Yorkshire crossbred pigs averaging 20 0?kg of bodyweight were randomly allocated into four dietary treatments with five replicates per treatment and one pig per replicate. The control pigs (group 1) were fed with basal diets containing salinomycin 50?mg/kg from growing (20～50, 50～70?kg) through finishing periods (70～100?kg). Group 2 was a new feeding regime. Pigs from 20～70?kg were fed with the same diets as Group 1 with 0 2?mg chromium /kg from chromium yeast replacing salinomycin. From 70～100?kg, the diet contained lower DE and CP than that in Group 1 and was added with 200?mg VE/kg. In Group 3 and Group 4, the rations consisted of 90% Group 1 diet+10% green vegetables (on air dry basis) and 90% Group 2 diet + 10% green vegetables respectively. Feed and water were available ad libitum. The results showed: ①Supplementation with 10% green vegetables in the rations reduced average back fat thickness by 20 0%～23 0% and enhanced carcass lean percentage by 4～5 percentage (P<0 05); ② Drip loss was reduced by the supplementation with 10% green vegetables. The content of IMP in longissimus muscle was enhanced by 6 0%～8 0%; ③ Average daily gain, feed utilization and carcass characteristics were not affected by 200?μg/kg Cr supplementation in growing period; ④The color score, pH and drip loss were not influenced by supplementation with 200?mg/kg VE in finishing period; ⑤ The decrease of dietary DE and protein concentration tended to improve carcass lean percentage and reduced the average back fat thickness.