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Genetic and clonal responses in closed dairy cattle nucleus schemes

Published online by Cambridge University Press:  02 September 2010

I. J. M. de Boer  and
J. A. M. van Arendonk
I. J. M. de Boer
Affiliation:
Department of Animal Breeding, Wageningen Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands
J. A. M. van Arendonk
Affiliation:
Department of Animal Breeding, Wageningen Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands
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Abstract

The additive genetic response per generation and the genetic superiority of female genotype(s) selected for commercial cloning (clonal response) were maximized for a closed adult nucleus scheme, with 256 or 1024 test places, by varying the mating design (number of clones, full-sibs and half-sibs). Responses were corrected for effects of finite sample size and correlated index values on the selection intensity, and variance reduction due to selection. Additive genetic responses, which varied from 0·153 to 0·514 phenotypic standard deviations per generation, were 0·68 to 0·89 of corresponding uncorrected predictions. Reductions were largest when the intensity and accuracy of male selection were high. Clonal responses varied from 0·460 to 2·506 phenotypic standard deviations, increasing with the intra-clone correlation, the intensity of clonal selection and the test capacity. Reductions in clonal responses, which varied from proportionally 0·04 to 0·27, were smallest when dominance variance was high. Increasing the test capacity resulted in a proportionally 0·21 to 1·55 increase in genetic responses, while proportional increases in clonal responses varied from 0·09 to 0·36. With selection of only one male per full-sib family, designs which maximized genetic and clonal responses were different in all cases. Differences were largest when the heritability and the intra-clone correlation were low and the intensity of clonal selection was high. Without the restriction on male selection, optimal mating designs were different, unless dominance variance and intensity of clonal selection were both low.

Keywords

breeding programmescloningdairy cattle
Type
Research Article
Information
Animal Production , Volume 53 , Issue 1 , August 1991 , pp. 1 - 9
Copyright
Copyright © British Society of Animal Science 1991

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References

Bondioli, K. R., Westhusin, M. E. and Looney, C. R. 1990. Production of identical bovine offspring by nuclear transfer. Theriogenology 33: 165–174.CrossRefGoogle Scholar
Bulmer, M. G. 1980. The mathematical theory of quantitative genetics. Clarendon Press, Oxford.Google Scholar
Burrows, P. M. 1972. Expected selection differentials for directional selection. Biometrics 28: 1091–1100.CrossRefGoogle ScholarPubMed
Cochran, W. G. 1951. Improvement by means of selection. In Proceedings of the 2nd Berkeley symposium on mathematics, statistics and probability (ed. Neyman, J.), pp. 449–470. University of California Press, Berkeley.Google Scholar
Juga, J. and Maki-Tanila, A. 1987. Genetic change in a nucleus breeding dairy herd using embryo transfer. Ada Agriculturae Scandinavia 37: 511–519.CrossRefGoogle Scholar
Keller, D. S., Gearheart, W. W. and Smith, C. 1990. A comparison of factors reducing selection response in closed nucleus breeding schemes. Journal of Animal Science 68: 1553–1561.Google Scholar
Leibfried-Rutledge, M. L., Critser, E. S., Parrish, J. J. and First, N. L. 1989. In vitro maturation and fertilization of bovine oocytes. Theriogenology 31: 61–74.CrossRefGoogle Scholar
Meuwissen, T. H. E. 1989. A deterministic model for the optimization of dairy cattle breeding based on BLUP breeding value estimates. Animal Production 49: 193–202.Google Scholar
Meuwissen, T. H. E. 1990. Optimization of dairy cattle breeding plans with increased female reproductive rates. Doctoral thesis, Department of Animal Breeding, Wageningen Agricultural University.Google Scholar
Meuwissen, T. H. E. 1991. Reduction of selection differentials in finite populations with a nested full-half sib family structure. Biometrics 46: 1–13.Google Scholar
Rawlings, J. O. 1976. Order statistics for a special class of unequally correlated multinormal variates. Biometrics 32: 875–887.CrossRefGoogle Scholar
Ruane, J. and Thompson, R. 1989. Simulation of an adult multiple ovulation and embryo transfer (MOET) nucleus breeding scheme in dairy cattle. In New selection schemes in cattle: nucleus programmes (ed. Kalm, E. and Liboriussen, T.), pp. 72–80. Pudoc, Wageningen.Google Scholar
Smith, C. 1989. Cloning and genetic improvement of beef cattle. Animal Production 49: 49–62.Google Scholar
Teepker, G. and Smith, C. 1989. Combining clonal response and genetic response in dairy cattle improvement. Animal Production 49: 163–169.Google Scholar
Woolliams, J. A. 1989a. The value of cloning in MOET nucleus breeding schemes for dairy cattle. Animal Production 48: 31–35.CrossRefGoogle Scholar
Woolliams, J. A. 1989b. Modifications to MOET nucleus breeding schemes to improve rates of genetic progress and decrease rates of inbreeding in dairy cattle. Animal Production 49: 1–14.Google Scholar