Effect of Scavenging and Supplementation of Lysine and Methionine on the Feed Intake, Performance and Carcase Quality of Improved Dual-Purpose Growing Chickens
Effect of Scavenging and Supplementation of Lysine and Methionine on the Feed Intake, Performance and Carcase Quality of Improved Dual-Purpose Growing Chickens
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DOI：
10.1007/s11250-005-4305-0
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发表时间：
2005-10
影响因子：
1.7
通讯作者：
D. V. Minh;B. Ogle
中科院分区：
文献类型：
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作者：
D. V. Minh;B. Ogle
采用192只4～12周龄改良两用鸡进行试验，评价低蛋白日粮管理制度（圈养和清粪）和氨基酸补充（添加或不添加赖氨酸和蛋氨酸）对改良鸡饲料和营养摄入、生产性能和胴体质量的影响。被限制的鸡的平均每日干物质（DM）、粗蛋白和代谢能摄入量（分别为 65 g、13.3 g 和 966 kJ）高于食腐鸡（分别为 58 g、12.0 g 和 868 kJ）（p < 0.001），未补充补充剂的鸡（分别为 63.3 g、13.0 g 和 945 kJ）高于食腐鸡（分别为 63.3 g、13.0 g 和 945 kJ）补充的鸟类（分别为 59.5 g、12.2 g 和 889 kJ）（p < 0.001）。男性和女性的平均 DM 摄入量分别为 68.0 克/天和 54.9 克/天 (p<0.001)。平均日增重 (ADG) 采食组 (26.9 g) 高于圈养组 (23.9 g) (p < 0.001)，补充组 (27.6 g) 高于未补充组 (23.2 g) (p < 0.001)，雄性 (27.5 g) 高于雌性 (23.3 g) (p < 0.001)。补充补充剂的家禽的胴体、胸部和大腿的百分比高于未补充的家禽（p < 0.001），而食腐的家禽则高于封闭的家禽（p < 0.001）。与相应的限制治疗相比，清除治疗的腹部脂肪百分比显着降低（p<0.001）。食腐处理的饲料转化率（千克饲料/千克增重）和饲料成本/千克增重低于圈养处理，并且补充的禽类低于未补充的禽类（p < 0.001）。在蛋白质和必需氨基酸含量不理想的日粮中补充赖氨酸和蛋氨酸可以提高生产性能和胴体质量，并降低饲料成本，特别是对于封闭式种植者而言。
An experiment was conducted with 192 improved dual-purpose chickens from 4 to 12 weeks of age to evaluate the effects of management system (confinement and scavenging) and amino acid supplementation (with and without lysine and methionine) of a low-protein diet on the feed and nutrient intake, performance and carcase quality of improved chickens. Mean daily dry matter (DM), crude protein and metabolizable energy intakes were higher for the confined birds (65 g, 13.3 g and 966 kJ, respectively) than for the scavenging birds (58 g, 12.0 g and 868 kJ, respectively) (p< 0.001) and higher for the unsupplemented (63.3 g, 13.0 g and 945 kJ, respectively) than for the supplemented birds (59.5 g, 12.2 g and 889 kJ, respectively) (p< 0.001). Mean DM intake was 68.0 and 54.9 g/day for the males and females (p< 0.001), respectively. Average daily weight gains (ADG) were higher for scavenging (26.9 g) than for confined birds (23.9 g) (p< 0.001), higher for supplemented (27.6 g) than for unsupplemented birds (23.2 g) (p< 0.001) and higher for males (27.5 g) than for females (23.3 g) (p< 0.001). Carcase, breast and thigh percentages were higher for supplemented than for unsupplemented birds (p< 0.001) and higher for scavenging than for confined birds (p< 0.001). Abdominal fat percentage was significantly lower for the scavenging treatments compared to the corresponding confined treatments (p< 0.001). Feed conversion ratios (kg feed/kg gain) and feed costs/kg gain were lower for the scavenging than for the confinement treatments, and lower for the supplemented than for the unsupplemented birds (p< 0.001). Supplementation of lysine and methionine in diets that were suboptimal in terms of protein and essential amino acids improved performance and carcase quality and reduced feed costs, in particular of the confined growers.