Bone Growth and Development of Broilers with Different Growth Rate
In order to explore the growth and development of the length and weight among metatarsal,tibia and femur of white feather broilers with different growth rates,the broilers of slow growth rate(wod168),medium growth rate(wod178)and fast growth rate(wod188 and AA)were taken as the mate-rials to determine the length and weight of their metatarsal,tibia and femur from 2 weeks to 7 weeks.The results showed that the bone traits increased with age from 2 weeks to 7 weeks among all the broilers.The highest growth intensity of metatarsal length,tibial length were observed in wod188 at 3 weeks,with corre-sponding relative growth coefficients of 36.47％and 25.11％,the greatest growth intensity of femur length,tibial weight and femur weight were in wod178 at 3-week age,and the corresponding relative growth coefficients were 21.49％,71.32％and 74.49％respectively.The greatest growth intensity of metatarsal weight was in wod168 at 4 weeks of age,and the corresponding relative growth coefficients was 81.66％.At 7 weeks of age,the metatarsal weight of wod168 and wod178 were extremely lower than that of wod188 and AA(P＜0.01).The tibial weight of wod178 was remarkably higher than that of wod168,and extremely lower than that of wod188 and AA(P＜0.01).The femoral weight of wod168 was significantly lower than the others(P＜0.01),there was no significant difference in the other three varieties(P＞0.05).The bone growth and development of the four breeds basically reached the maximum at 3 weeks of age,the growth and development rate was the fastest,and broilers with high-er blood ties of laying hens have lighter bone weight.
万方数据
维普
