早期限饲对肉鸡肺动脉高压综合征发病率、生产性能和腹脂率的影响

采用低温诱发肉鸡肺动脉高压综合征,对比观察不同的早期限饲方法对于常温和低温条件下PHS的发病率、肉鸡生产性能和腹脂率的影响。在试验1中,限饲处理组肉鸡分别于7￣14日龄或7￣21日龄每天给料8h,对照组肉鸡全程自由采食。在试验2中,限饲组肉鸡分别于7￣14日龄给予对照组肉鸡前1d饲料消耗量的60%或80%。结果表明:早期限饲能够降低肉鸡PHS的发病率,在低温条件下尤其明显;早期限饲改善了饲料效率,同时未对肉鸡的胴体品质产生显著的影响,且适当限饲不影响肉鸡的最终上市体重。这表明早期限饲是一种有效的控制肉鸡PHS的方法,值得在实际生产中推广应用。

Effects of Early Feed Restriction on the Pulmonary Hypertension Syndrome Morbidity,Performance and Abdominal Fat Pad Ratio in Broilers

Broilers were exposed to low ambient temperature to induce pulmonary hypertension syndrome (PHS). Experiments were conducted to investigate the effects of different early feed restriction regimes on the PHS morbidity, performance characteristics and meat quality of commercial broilers under normal or low ambient temperature. In experiment 1, the restricted chicks were fed 8 hours per day either from day 7 to day 14 or from day 7 to day 21, while the controlled chicks were fed ad libitum. In experiment 2, the restricted chicks were fed 80% or 60% of previous 24 hour feed consumption of full-fed controls for 7 days from day 7 to day 14. The results showed that early feed restriction treatments reduced PHS morbidity, which was more significant under low temperature. Feed conversion ratios were lower in fed restricted broilers than in full fed controls. Early feed restriction had no obvious effects on abdominal fat pad ratio, and proper feed restriction did not affect the final body weight of broiler on market age. These results indicated that early feed restriction was an effective method to control the incidence of PHS in broiler.