研究断喙后喙形对蛋鸡产蛋性能和经济效益的影响.选用135只20周龄海兰褐商品蛋鸡,分为3个处理,每个处理3次重复.第1组上下喙长相同,第2组上下喙都短,第3组上喙长与第1组相当,上喙短于下喙3 mm.3个处理组的饲养管理一致,试验期36周.结果表明:在20周龄时,第2组蛋鸡体质量和胫长低于第1和3组；第25、30、35和40周龄时,第1组蛋鸡体质量显著高于第2组蛋鸡体质量(P＜0.05).在产蛋中期(25～42周),第3组蛋鸡产蛋率分别比第1和2组高7.04％和8.28％ (P＜0.05)；在产蛋中期(25 ～42周)和产蛋后期(43～55周)第1组蛋质量显著高于第2和3组(P＜0.05).整个试验期间,第3组的产蛋率分别比第1和2组高4.46％和4.78％ (P ＞0.05),经济效益分析表明,第3组每只鸡比第1和2组每只鸡多收入3.06元和2.95元.上述结果表明,第3种喙形对蛋鸡生产最为有利.%Effects of beak morphology after beak trimming on the laying performance and economic benefit in laying hens were studied.135 commercial layers of Hy-Line brown at the age of twenty weeks were divided into three groups with 3 replicates.The beak lengths of upper and lower mandibles of the layers in group 1 were the same and those of group 2 were similar but whose upper mandible was 3 mm shorter than that of group 1 (P ＜ 0.05),the lower mandible was 3 mm longer than that of the upper mandible of the layers in group 3.The three groups were under the same feeding management and the experiment lasted 36 weeks.The results showed that,the body weight and shank length of group 2 were significantly lower than that of group 1 and 3 (P ＜0.05),and the body weight of group 1 at 25th,30th,35th and 40th week were significandy higher than that of group 2 (P ＜ 0.05).During the period of laying (25 to 42 weeks),the laying rate of group 3 was 7.04％ and 8.28％ higher than that of group 1 and 2 (P ＜ 0.05),respectively.The average egg weight of group 1 was significantly higher than that of group 2 and 3 during the laying period (25 to 42 weeks) and late period of laying (43 to 55 weeks) (P ＜0.05),respectively.From 20 to 55 weeks,the laying rate of group 3 was 4.46％ and 4.78％ higher than that of group 1 and 2 (P ＞ 0.05),respectively.The economic benefit was analyzed and the income of one hen of group 3 was 3.06 and 2.95 yuan (RMB) higher than that of group 1 and 2.In a word,the beak morphology of layers in group 3 was in favor of production of laying hens.
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