Gregory N G, Wilkins L J
School of Veterinary Science, University of Bristol, Langford, Bristol BS18 7DY, United Kingdom.
N Z Vet J. 1996 Feb;44(1):31-2. doi: 10.1080/00480169.1996.35928.
This study examined the effect of age on bone breaking strength and the prevalence of broken bones in hens kept in a perchery egg laying system. During the first 6 weeks of lay, bone strength increased by about 25%. The prevalence of broken bones which had repaired increased from 0% at 19 weeks of age to 23% at 72 weeks. Most of this increase occurred during the last half of lay and during this period the humerus became slightly more brittle. The exact reason for the increase in broken bones was not revealed, but because they occurred largely in the keel and furculum they were thought to be due to flight and landing accidents.
本研究考察了年龄对处于栖架式产蛋系统中的母鸡骨骼断裂强度及骨折发生率的影响。在产蛋的前6周，骨骼强度增加了约25%。已修复骨折的发生率从19周龄时的0%增至72周龄时的23%。这种增加大多发生在产蛋后期，在此期间肱骨变得稍脆。骨折增加的确切原因未明，但因其大多发生在龙骨和叉骨，故认为是由飞行和着陆事故所致。
