Monte Carlo Simulation to Assess the Impact of Adult MOET Schemes in Somba Cattle

Revue d’Elevage et de Médecine Vétérinaire des Pays Tropicaux

L. Dempfle¹  M. Senou² 

[1] Department of Animal Science, T.U.-München, Weihenstephan, Alte Akademie 12, 85350 Freising, Germany.;Faculté des Sciences agronomiques, Université d’Abomey-Calavi, 01BP526, Cotonou, Bénin.;

关键词: Bovin Somba;    Superovulation;    Transfert embryonnaire;    Gain génétique;    Consanguinité;    Bénin;    Togo;   

DOI  :  10.19182/remvt.9997

来源: DOAJ

【 摘 要 】

Monte Carlo simulations were carried out in order to assess the impact of multiple ovulation and embryo transfer (MOET) on the dairy performance of Somba cattle. Adult MOET-nucleus schemes were simulated over 20 generations of selection, assuming a fixed test capacity of 512 milk recorded females, a success rate of transfer of 70%, a survival rate of 70% and various sibship sizes (nD = 4, 8, 16). Selection criteria were the BLUP estimates of the true additive genetic values of candidates using the reduced animal model. For different combinations of number of donors (D = 64, 128, 256) and number of sires (S = 4, 8, 16) to be selected, the simulated genetic response in milk yield ranged from 0.088 to 0.127 phenotypic standard deviation units (SU) per year. These figures corresponded to a genetic progress of 2.2 to 3.2% of the population mean per year (coefficient of variation in milk yield is 25% for Somba cattle). For all alternatives with regard to population structure, the simulated rate of inbreeding ranged from 1.32 to 2.93% per year, while the expected one ranged from 0.83 to 3.32%. Compared to the rate of inbreeding commonly admitted in a conventional progeny-testing scheme (0.1 to 0.2% per year), the rates of inbreeding expected from the simulated adult MOET schemes were quite high and could be a cause of concern. Strategies to reduce inbreeding in short or medium terms were examined.

【 授权许可】

Unknown