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Improvement of metric traits through specific genetic loci

Published online by Cambridge University Press:  02 September 2010

Charles Smith
Charles Smith
Affiliation:
A.R.C. Animal Breeding Research Organisation, Edinburgh 9
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Extract

Known genetic loci that affect metric traits may be useful in livestock improvement. Their value depends on the proportion (R) of the total additive genetic variation due to the known loci relative to the heritability of the trait concerned and on the form of selection practised. When normal selection is effective, further information on known loci can add only a little to the rate of improvement. But if normal selection is not very effective, as for characters of low heritability, or if indirect selection on relatives must be used (as for sex-limited or carcass traits) then known loci may add significantly to the rate of improvement possible.

Sampling errors in the estimated effects and in the proportion (R) may cause selection effort to be misdirected and may even lead to losses rather than gains in improvement. Such errors are most likely to occur when the heritability of the character is low.

Reports on several loci with large effects in the various farm species have been summarised, but the evidence is often inconsistent and contradictory. At present, there appear to be no loci that could be used with confidence in the improvement of economic traits in farm animals.

Type
Research Article
Information
Animal Production , Volume 9 , Issue 3 , August 1967 , pp. 349 - 358
Copyright
Copyright © British Society of Animal Science 1967

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References

REFERENCES

Ashton, G. C., 1960. β-Globulin polymorphism and economic factors in dairy cattle. J. agric. Sci., Camb., 54: 321–328.Google Scholar
Ashton, G. C., 1961. β-Globulin type and fertility in artificially bred dairy cattle. J. Reprod. Fert., 2: 117–129.CrossRefGoogle ScholarPubMed
Baltzer, J., 1964. Untersuchungen über das Bestehen von Beziehungen zwischen Blutgruppenfaktoren und Daten des Schlachtkörperwertes und der Mastleistung des Schweines. Züchtungskunde, 36: 317–326.Google Scholar
Briles, W. E., & Allen, C. P., 1961. The B blood group system of chickens. II. The effects of genotype on livability and egg production in seven commercial inbred lines. Genetics, 46: 1273–1293.Google Scholar
Cockerham, C. C., 1956. Effects of linkage on the covariances between relatives. Genetics, 41: 138–141.Google Scholar
Falconer, D. S., 1960. Introduction to Quantitative Genetics. Oliver and Boyd, Edinburgh. 365 pp.Google Scholar
Latter, B. D. H., 1965. The response to artificial selection due to autosomal genes of large effect. Aust. J. biol. Sci., 18: 585–598.CrossRefGoogle ScholarPubMed
Mitscherlich, E., 1965. Genetische Beziehungen zwischen Eigenschaften des Blutes und Leistungsmerkmalen bei verschiedenen Haustierarten. Züchtungskunde, 37: 375–387.Google Scholar
Mitscherlich, E., Tolle, A., & Walter, E., 1959. Untersuchungen über das Bestehen von Beziehungen zwischen Blutgruppenfaktoren und Milchleistung des Rindes. Z. Tier. ZüchtBiol., 72: 289–301.CrossRefGoogle Scholar
Morton, J. R., Gilmour, D. G., McDermid, E. M., & Ogden, A. L., 1965. Association of blood-group and protein polymorphisms with embryonic mortality in the chicken. Genetics, 51: 97–107.CrossRefGoogle ScholarPubMed
Neimann-Sørensen, A., & Robertson, A., 1961. The association between blood groups and several production characters in three Danish cattle breeds. Acta Agr. Scand., 11: 163–196.CrossRefGoogle Scholar
Searle, R. S., 1966. The value of indirect selection: I. Mass selection. Biometrics, 21: 682–707.CrossRefGoogle Scholar
Spickett, S. G., & Thoday, J. M., 1965. Regular responses to selection. 3. Interaction between located polygenes. Genet. Res., 7: 96–121.CrossRefGoogle Scholar
Stanfield, W. D., Bradford, G. E., Stormont, C., & Blackwell, R. L., 1964. Blood groups and their association with production and reproduction in sheep. Genetics, 50: 1357–1367.CrossRefGoogle Scholar
Wehrhahn, C., & Allard, R. W., 1965. The detection and measurement of the effects of individual genes involved in the inheritance of a quantitative character in wheat. Genetics, 51: 109–119.CrossRefGoogle ScholarPubMed