摘要
分析了１６头湖羊种公羊的５４８个女儿共计２６３１胎产羔记录，发现母羊每胎产羔数为１～５只的比例分别为１５．１７％，４５．７６％，３２．１５％，６．０８％及０．８４％。对不同胎次的产羔数作方差分析，结果表明，胎次间存在着显著差异。每胎产羔数与胎次的关系为：ｙ＝１．７６４８＋０．２８６０ｘ－０．０２６７ｘ２，复相关指数为Ｒ２＝０．９９９６。依据该回归方程计算出每胎产羔估计值，并以４，５，６，７胎的校正产羔值的简单平均数为基准，计算了各胎次的校正系数。应用次级样本含量不等的两因子最小二乘方差分析法估计种公羊的产羔效应值，表明种公羊间存在着繁殖性能方面的差异。
A total of 2 631 litter records from 548 daughters of 16 stock rams were analysed. The results showed that the ratio of 1 5 lambs per litter were 15.17%, 45.76%, 32.15%, 6.08% and 0.84% respectively. The significant defferences were existed in each litter by variance analysis. The parabola function was y=1.764 8+ 0.286 0x -0.026 7x 2 between the lambing number and litter, with muitiple correlation index R 2 =0.999 6. The lambing number per litter was estimated by this function and the correction factor each litter was calculated based on the simple mean values of 4th, 5th, 6th and 7th litter. The lambing effect values showed that the significant differences were existed between stock rams by the least square variance analysis.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
1998年第1期77-81,共5页
Journal of Nanjing Agricultural University
