优质三黄鸡粤黄882早期生长发育规律观测分析

【目的】观测分析优质三黄鸡粤黄882早期发育过程中体重与体尺的相关性,为后期动态研究三黄鸡的生长发育及制定生长计划提供科学依据。【方法】运用Logistic模型和Gompertz模型分别对0~9周龄三黄鸡粤黄882的体重进行生长曲线拟合,并以SPSS 10.0对其2、4、6和8周龄的体重与5个主要体尺指标(胫长、体斜长、胸骨长、胸深和胸宽)进行相关分析和体型指数计算。【结果】三黄鸡粤黄882的体重和体尺指标均随日龄的增长而逐渐增加,胫长、体斜长和胸骨长呈全期生长趋势,胸宽和胸深呈阶段性生长趋势,以4~6周龄的增长幅度较高;体重与5个主要体尺指标(胫长、体斜长、胸骨长、胸深和胸宽)间均呈极显著正相关(P0.01)。Logistic模型和Gompertz模型均可很好地拟合出三黄鸡粤黄882的生长曲线,拟合度(R2)在0.9980以上,综合极限体重、拐点周龄和体重等参数,发现Gompertz模型的拟合效果略优于Logistic模型。由Gompertz曲线方程拟合得出公鸡的生长曲线拐点为(8.15,1273.78),母鸡的生长曲线拐点为(4.08,419.25)。【结论】三黄鸡粤黄882的生长拐点为公鸡8.15周、母鸡4.08周,公鸡较母鸡发育迟缓。由于公鸡和母鸡的生长速度不一致,其早期生长发育所需营养量也不同,因此三黄鸡粤黄882宜在4周龄前分群饲养,有助于发挥母鸡高水平的产蛋性能。

Early development and growth regulation of high-quality Sanhuang chicken Yuehuang 882

Objective]The correlation between body weight and body measurement during early development of San-huang chicken Yuehuang 882 was analyzed to provide scientific basis for the later dynamic research of its growth and deve-lopment and formulating growth plan. Method]In this experiment, the weight growth curve of 0-9 weeks old Sanhuang chicken Yuehuang 882 was fitted by Logistic model and Gompertz model. Correlation analysis and habitus index calcula-tion for body weight and mian body measurement indicators(shank length, body slanting length, sternum length, chest depth and chest width) of 2, 4, 6 and 8 weeks old chichen were conducted by SPSS 10.0. Result]The weight and body measurement indicators of the chicken increased with the growing of age. Shank length, body slanting length and sternum length was in full-stage growth trend. Chest width and chest depth was in stage growth trend, moreover, the growth rate of 4-6 weeks old chicken was high. Body weight was positively correlated with the five main body measurement indicators (shank length, body slanting length, sternum length, chest depth and chest width), and the correlation coefficients were all extremely significant(P<0.01). Both Gompertz model and Logistic model fit well to the growth curve of the chicken, and the fitting degree(R2) was above 0.9980. Taking indicators like limit weight, body weight at inflection point and weight into consideration, the fitting effect of Gompertz model was slightly better than that of Logistic model. The male in-flection point of growth curve was(8.15, 1273.78) fitted by Gompertz curve equation, female inflection point of growth curve was(4.08, 419.25). Conclusion]The growth curve inflection point for male Sanhuang chicken Yuehuang 882 is 8.15 weeks and female 4.08 weeks. The growth of male is slower than female. Since the growth speeds are different, the nutrition required by male and female at early development and growth are not the same. Therefore, before 4 weeks old, it is better to culture male and female seperately, which can improve the egg laying performance.