Department of Animal Breeding and Production, Poultry Breeding Division, Warsaw University of Life Sciences, 02-786 Warsaw, Poland.
Department of Emergency Medicine, Faculty of Natural Science, Siedlce University of Natural Sciences and Humanities, 08-110 Siedlce, Poland.
Poult Sci. 2019 Dec 1;98(12):7063-7075. doi: 10.3382/ps/pez445.
We studied the changes in morphological, geometric, densitometric, and mechanical parameters of the femur and tibia during 56 D of rearing chickens with different growth rates. Ten femur and tibia were collected from fast-growing chickens (FG) and 2 types of medium-growing chickens (MGH and MGGP) immediately after hatching (0 D) and on 7, 14, 21, 35, 42, 49, and 56 D of life. The bone parameters of chickens across all genetic groups were found to be similar on 0 D, with exceptions of lower percentage contribution of bone weight (BW) in FG chickens (P < 0.05), lower total bone volume in MGGP chickens (P < 0.05), and lower maximum elastic strength in MGH chickens (P < 0.05). The bones developed in FG chickens were longer and wider; however, an increase in bone mineral density (BMD) between 42 and 49 D was not observed. The BMD value in FG chickens on 56 D was comparable to that in MGH chickens (P = 0.089) and significantly lower than that in MGGP chickens (P = 0.021). Mean relative wall thickness, despite longer and thicker bones in FG chickens, was comparable and often lower than that of MGH and MGGP chickens. In conclusion, the results showed that medium-growing chickens could be reared for up to 56 D without the risk of any growth impairment due to problems associated with deterioration of pelvic limb bone quality.
我们研究了在不同生长速度的鸡饲养 56 天期间股骨和胫骨的形态、几何、密度和机械参数的变化。在孵化后立即（0 天）和第 7、14、21、35、42、49 和 56 天，从快速生长的鸡（FG）和 2 种中速生长的鸡（MGH 和 MGGP）中收集了 10 个股骨和胫骨。在 0 天，所有遗传群体的鸡的骨骼参数相似，但 FG 鸡的骨重（BW）百分比贡献较低（P < 0.05），MGGP 鸡的总骨量较低（P < 0.05），MGH 鸡的最大弹性强度较低（P < 0.05）。FG 鸡的骨骼更长更宽；然而，42 至 49 天之间没有观察到骨密度（BMD）增加。56 天 FG 鸡的 BMD 值与 MGH 鸡相当（P = 0.089），显著低于 MGGP 鸡（P = 0.021）。尽管 FG 鸡的骨骼更长更厚，但平均相对壁厚与 MGH 和 MGGP 鸡相当，并且通常较低。总之，结果表明，中速生长的鸡可以饲养 56 天而不会因与骨盆肢骨质量恶化相关的问题而导致生长受损的风险。
