Histological changes in chick beak caused by debeaking.
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概要
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Debeaking treatments were conducted at 1 (1WD) and 5 (5WD) weeks of ages, respectively. The tips of upper and lower beaks were removed at 3mm (1WD) or 5mm (5WD) by electrically heated debeaker. Regeneration of the upper beak was observed morphologically and histologically on subsequent weeks of age.There were two chicken groups namelly depressed and non-depressed groups in regeneration of the beak in each treatment. The length of the beaks regenerated of the both groups of 1WD was significantly shorter (p<0.01) than that of the non-debeaked control chicks at 11 and 16 weeks of ages. At 11 weeks of age, the length of the depressed group of 5WD was shorter (p<0.01) than that of the control chicks and no difference was observed in the length of beak between the non-depressed group of 5WD and the control chicks. No significant difference was observed in the length between the depressed group of 5WD and the control chicks at 16 weeks of age. But the length of the non-depressed groups of 5WD at the same weeks of age was significantly longer (p<0.01) than that of control chicks. A few number of beaks (2 out of 19 chicks) of 1WD and all beaks (21 chicks) of 5WD were required to debeak again on subsequent weeks of age.The tip of incisive bone including ossification zone of the chicks of 1WD was removed by debeaking. After debeaking, ossification was observed in the bone remained. However, the order of ossification was disturbed by debeaking. It is evident that the disorder of ossification in the incisive bone artribute to depress regeneration of the beak after debeaking. While debeaking at 5 weeks of age (5WD), a part of ossification zone in the bone was not removed or no injury was observed in the tip of the bone. Then, the ossification was occurred normally in the bone after debeaking.
- 日本家禽学会の論文
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