Abstract
Genetic gains and inbreeding coefficients in a Holstein MOET breeding population were predicted under different conditions relating to the distribution of the number of transferable embryos collected per flush using MonteCarlo simulation. The numbers of transferable embryos collected per flush were determined using five distributions (distributions 1, 3, 5, 7 and 9) with different aspects and similar means. Distributions 1, 3, 5, 7 and 9 were assumed to have gamma distribution's parameters (a and β) of (1 and 4.4), (3 and 1.47), (5 and 0.88), (7 and 0.63) and (9 and 0.49), respectively. Inbreeding rates were statistically significantly different among distributions but genetic gains were not. Relationships between inbreeding rates and variances of family size could be were clearly distinguished. The highest inbreeding coefficients were predicted in distribution 1 with the largest variance of family size, while distributions 5, 7 and 9 with smaller variance of family size had lower inbreeding coefficients.
Highlights
Many works have examined the effects of number of transferable embryos collected per flush on genetic gain and inbreeding coefficient in the MOET cattle population (Nicholas and Smith, 1983; Keller and Teepker, 1990; Leich et al, 1995)
There are few studies about the relationship between the models for determining the number of transferable embryos collected per flush and genetic gain in the MOET beef or dairy cattle population
These results indicate that the aspect of distributions of the number of transferable embryos collected per flush, rather than genetic gains, Table 2
Summary
Many works have examined the effects of number of transferable embryos collected per flush on genetic gain and inbreeding coefficient in the MOET cattle population (Nicholas and Smith, 1983; Keller and Teepker, 1990; Leich et al, 1995). These studies indicate the significant effects of number of transferable embryos collected per flush on the genetic character of the population. Models were used to determine the number of transferable embryos collected per flush in the simulation experiments. There are few studies about the relationship between the models for determining the number of transferable embryos collected per flush and genetic gain in the MOET beef or dairy cattle population.
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