This study investigated the effects of beak trimming on a local broiler breed. A total of 648 one‐day‐old birds were randomly allocated into three treatments: no trimming (NBT), infrared beak trimming (IRBT), and hot‐blade beak trimming (HBBT). The performance, beak length, behavior, carcass traits, organ percentages, and meat quality were inspected. The body weight (BW) from 7 to 35 days in the IRBT group was significantly lower than that in the NBT group, and the BW from 7 to 49 days was lower than that in the HBBT group (p <  .05). Compared with untrimmed birds, birds in the IRBT group had lower average daily feed intake (ADFI) from 15 to 21 days, and higher heart percentage and L* value in the breast muscle. The upper beak length at 28 and 49 days of age were longest in untrimmed birds, intermediate in birds in the HBBT group, and shortest in the IRBT groups (p  <.05). No evidence was found that HBBT caused changes in performance, behavior, carcass traits, organ percentages, and meat quality except for lower change in spleen percentage. Taken together, IRBT had more influence at inhibiting early BW, ADFI, and upper beak length than HBBT in the local broiler breed.

中文翻译：

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断喙对在电池笼中饲养的本地肉鸡品种的性能、喙长、行为和胴体性状的影响。

本研究调查了断喙对当地肉鸡品种的影响。共有 648 只一天大的鸡被随机分配到三个处理组：不修喙 (NBT)、红外修喙 (IRBT) 和热刀片修喙 (HBBT)。检查性能、喙长、行为、胴体性状、器官百分比和肉质。IRBT组7～35日龄体重（BW）显着低于NBT组，7～49日龄BW低于HBBT组（ p < .05). 与未修剪的鸡只相比，IRBT 组的鸡只在 15 至 21 天的平均每日采食量 (ADFI) 较低，胸肌心率和 L* 值较高。28 日龄和 49 日龄的上喙长度在未修剪的鸟类中最长，在 HBBT 组的鸟类中居中，在 IRBT 组的鸟类中最短（p  <.05）。没有证据表明 HBBT 会导致生产性能、行为、胴体性状、器官百分比和肉质发生变化，但脾脏百分比的变化较小。总之，IRBT 在抑制早期 BW、ADFI 和上喙长度方面比 HBBT 在当地肉鸡品种中的影响更大。