Acta Veterinaria et Zootechnica Sinica ›› 2019, Vol. 50 ›› Issue (12): 2545-2553.doi: 10.11843/j.issn.0366-6964.2019.12.019

• CLINICAL VETERINARY MEDICINE • Previous Articles     Next Articles

Effects of Different Beak-Trimming Methods on Growth Performance and Immune Function in Chicks

JIANG Sha*, WU Xiaoling, QIU Yan, LU Ju, FU Jinbao   

  1. College of Animal Science and Technology, Southwest University, Chongqing 400715, China
  • Received:2019-08-12 Online:2019-12-23 Published:2019-12-20

Abstract: To study the effects of different beak-trimming methods on chicks' growth performance and immune function, 720 1-day-old Jingfen-1 chicks were randomly divided into 3 treatments:non-treated group (control group, CG), 1-day-old infrared beak trimming group (infrared beak trimming group, IBT) and 8-day-old hot-blade beak trimming group (hot-blade beak trimming group, HBT). The beak length, body weight, feed intake and feed wasted of birds in each cage were measured. Heterophils and lymphocytes were counted from one chick per cage. Protein and cytokine levels in plasma were detected by biochemical analysis and ELISA. After humanely sacrifice chicks, the spleen and cloacal bursa of each sampled chick were weighted, the spleen samples were collected for histological examination and Real-time PCR. The results indicated that the treatments of beak trimming could significantly reduce beak length, and the method of infrared beak trimming was better than hot-blade. The food waste of birds was reduced by different beak-trimming methods; however, the feed intake of chicks was not affected. Compared with CG group, the weight of birds in the IBT group decreased significantly on the day 4 of experiment. IBDV Ab titer of 29-day-old chicks in the IBT group was lower than other two treatments. Heterophils and lymphocytes in blood, protein, sCD and cell cytokine in plasma, organ index of spleen and cloacal bursa, and microstructure of spleen, the gene expression of inflammatory and apoptosis factors in spleen were not affected by different beak-trimming methods. Our results indicate that beak-trimming treatments can significantly reduce the rate of feed wasted, which are beneficial to reduce production cost, and 1-day-old infrared beak trimming is more convenient and effective than hot-blade trimming. 1-day infrared beak trimming temporarily be not conducive weight gain of chicks, but this effect gradually disappears with age. The protection time of vaccine may be shortened for combination of infrared beak trimming and vaccination at the age of 1-day chicks.

Key words: infrared beak trimming, hot-blade beak trimming, chicks, performance, immune function

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