Estimation of Some Variance Components of Bovine Semen Criteria and Their Use in the Design of Experiments

摘要: Summary Semen production records of 68 bulls from Ave dairy breeds in four studs were used to estimate the bull, ejaculate, breed, season, and interaction variance components five criteria measure semen production. The means standard deviations individual observations for were: ml. per 8.0±2.4; cent motile sperm, 66±9.0; billions sperm semen, 1.71±0.62; 8.9±3.9, total 13.6±6.0. Component analyses showed that bull ejaculate accounted more than 90% all except sperm. Consequently, these two variances taken into account estimating power test by Tang's method. This there was little increase sensitivity be gained taking ten ejaculates bull. It calculated have a 75% chance detecting treatment difference 50% mean at 5% level significance would require about