Genetic implications of a simulation model of litter size in swine based on ovulation rate, potential embryonic viability and uterine capacity: II. Simulated selection.

摘要: Direct selection for ovulation rate, uterine capacity, litter size and embryo survival indexes of rate with each the remaining traits were simulated a swine population. The relationships among these determined from simulation model that assumed was always less than or equal to both capacity. Heritabilities capacity be .25 .20, respectively, uncorrelated genetically phenotypically. No additional genetic variation assumed. Responses weak pressure by recurrent updating phenotypic variances covariances combined heritabilities Two resulted in 37% greater increase direct size. Indexes either increased 21% more Selection 6, 35 79%, effective intense genotypes phenotypes individuals. two exceeded 39 27%. 19 13%, respectively. Intense decreased response 26 67%, relative slightly.