Publisher : Asian Australasian Association of Animal Production Societies
DOI : 10.5713/ajas.2002.944
Title & Authors
Heritability and Repeatability of Superovulatory Responses in Holstein Population in Hokkaido, Japan Asada, Y.; Terawaki, Y.;
The aim of this study was to estimate heritability and repeatability for the number of embryos and transferable embryos collected per flush in Holstein population in Hokkaido, Japan. Data consisted of 306 MOET (Multiple Ovulation and Embryo Transfer) treatments on 224 Holstein cows from 1997 to 2000. Variance components for these traits were estimated using the REML procedure. The model included only non-genetic factors that were significant at the 0.05 level, through using generalized linear models, maximum likelihood methods, and stepwise regression procedure as fixed effects and sire and residual for heritabilities, donor and residual for repeatabilities as random effects. The factor identified as important in determining the results was the donor''s estrous condition after superovulation. Heritabilities for the number of embryos and transferable embryos collected per flush were 0.14 and 0.09, respectively. The corresponding repeatabilities were 0.43 and 0.32, respectively. These results show that it was difficult to genetically improve these traits, thus, environmental and physical factors affecting the donor must be improved. These results also show that it is necessary to take the donor''s estrous condition after superovulation and repeatabilities for the number of embryos and transferable embryos collected per flush into account when the genetic gains and inbreeding rates for MOET breeding schemes are predicted by a computer simulation.
Relationships between Distribution of Number of Transferable Embryos and Inbreeding Coefficient in a MOET Dairy Cattle Population,;;
아세아태평양축산학회지, 2002. vol.15. 12, pp.1686-1689
Asada, Y. and Y. Terawaki. 2000. Adaptation of distribution on number of transferable embryos per treatment. Anim. Sci. and Agric. Hokkaido. 42:418-426.
Bastidas, P. R. and R. D. Randel. 1987. Effects on repeated superovulation and flushing on reproductive performance of Bos indicus cows. Theriogenology, 28:827-835.
Dematawewa, C. M. B. and P. J. Berger. 1998. Genetic and phenotypic parameters for 305-day yield, fertility, and survival in Holsteins. J. Dairy Sci. 81:2700-2709.
Donaldson, L. E. 1984. Effect of age of donor cows on embryo donor production. Theriogenology. 21:963-967.
Hasler, J. F., A. D. McCauley, E. C. Schermerhorn and R. H. Foote. 1983. Superovulatory responses of Holstein cows. Theriogenology. 19:83-99.
Genstat 5 committee. 2000. Genstat 5 Release 4.2 The Guide to Genstat. VSN International Ltd. Oxford. UK.
Isogai, T. 1992. Effects of season, age at calving, time after calving and interval of treatment the embryo production in superovulated Holstein donors. J. Reproduction and Development. 38:j1-j6.
Keller, D. S. and G. Teepker. 1990. Effect of variability in response to superovulation on donor cow selection differentials in nucleus breeding schemes. J. Dairy Sci. 73:549-554.
Lamberson, W. R. and V. A. Lamberth. 1986. Repeatability of response to superovulation in Brangus cows. Theriogenology, 26:643-648.
Land, R. B. and W. G. Hill. 1975. The possible use of superovulation and embryo transfer in cattle to increase response to selection. Anim. Prod. 21:1-12.
Lohuis, M. M., C. Smith and J. C. M Dekkers. 1993. MOET results from a dispersed hybrid nucleus programme in dairy cattle. Anim. Prod., 57:369-378.
McCullagh, P. and J. A. Nelder. 1983. Generalized Linear Models. Chapman and Hall. New York. 1st. ed.
Nicholas, F. W. and C. Smith. 1983.Increased rates of genetic change in dairy cattle by embryo transfer and splitting. Anim. Prod.. 36:341-353.
Ruane, J. and R. Thompson. 1991. Comparison of simulated and theoretical results in adult MOET nucleus schemes for dairy cattle. Livest. Prod. Sci. 28:1-20.
Smith, C. 1984. Rates of genetic change in farm livestock. Research and Development in Agriculture. 1:79-85.
Terawaki, Y. and Y. Asada. 2001. Effects of different methods for determining the number of transferable embryos on genetic gain and inbreeding coefficient in a Japanese Holstein MOET breeding population. Asian-Aust. J. Anim. Sci. 14(5):597-602.
Tonhati, H., R. B. Lobo and H. N. Oliveira. 1999. Repeatability and heritability of response to superovulation in Holstein cows. Theriogenology 51:1151-1156.
Veerkamp, R. F., E. P. C. Koenen and G. De Jong. 2001. Genetic correlations among body condition score, yield, and fertility in first- parity cows estimated by random regression models. J. Dairy Sci. 84:2327-2335.
Villanueva, B. and G. Simm. 1994. The use and value of embryo manipulation techniques in animal breeding. Proceedings of the 5th World Congress on Genetics Applied to Livestock Prod. Guelph. Vol.20: 200-207.
Villanueva, B., J. A. Woolliams and G. Smith. 1995. The effect of improved reproductive performance on genetic gain and inbreeding in MOET breeding schemes for beef cattle. Genetique Selection Evolution 27:347-363.
Woolliams, J. A., Z. W. Luo, B. Villanueva, D. Waddington, P. J. Broadbent, W. A. C. McCauley and J. J. Robinson. 1995. Analysis of factors affecting superovulatory responses in ruminants. J. Agric. Sci. 124:61-70.