生长期限食对蛋鸡生长发育及产蛋性能的影响

THE EFFECT OF RESTRICTED FEEDING DURING REARING ON THE GROWTH AND EGG PRODUCTION PERFORMANCE(1)

试验观察限食对蛋鸡生长期的生长发育、体成分及营养物质利用的影响。白来航母鸡(8～20周)采食以米糠为主要饲料的低能饲粮,17％(B)和32％(C)稻壳作能量稀释剂,对照(A)、B和C饲粮的代谢能水平分别为2.17,9.79和7.16千焦/克;粗蛋白质分别为14.6,11.9和11.0％。试验结果表明,B处理组采食量增加18～20％,能量采食量和生长速度均低于对照(P>0.05)。尽管C处理组采食量增加13～50％(P<0.01),能量进食量却比对照低14～29％(P<0.01),导致较慢的生长速度(P<0.01)。B处理组的体成分和营养物质利用受限食的影响较小(P>0.05);C处理组影响较大(P<0.01),体水分增加4％个单位,体脂肪降低4％个单位,限食对能量和蛋白质利用的影响是暂时的,能量效率受波及的时间长于蛋白质效率,高纤维饲粮促进肌胃的生长。

An experiment was conducted to observe the effect of feed restriction of White Hegor on the growth, body composition and nutrient utilization. The chickens ate three deits that contained 12.17(HE), 9.79(ME) and 7.61(LE) KJ metabolizable energy and 14.6, 11.9 and 11.0％ protein restrictively during 8～20 weeks.Though the food consumption in LE chickens was very high compared with that in HE chickens, lower energy intake of LE chickens resulted in slow growth rate (P<0.01), low body fat (P<0.01) and high body water (P<0.01). The growth rate, energy and protein efficiency and body fat of ME chickens were not significantly effected by the low energy diet due to feed intake increase though the those were slightly lower in ME chickens than in HE chickens. The energy efficiency for LE chickens was tempoaryly by feed restricing (12～16 weeks),