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Population structure of the Sahiwal breed in Pakistan

Published online by Cambridge University Press:  02 September 2010

A. Dahlin ,
U. N. Khan ,
A. H. Zafar ,
M. Saleem ,
M. A. Chaudhry  and
J. Philipsson
A. Dahlin
Affiliation:
Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden
U. N. Khan
Affiliation:
Animal Sciences Institute, National Agricultural Research Centre, Islamabad 45500, Pakistan
A. H. Zafar
Affiliation:
Livestock Production Research Institute, Bahadurnagar, Okara, Pakistan
M. Saleem
Affiliation:
Livestock Production Research Institute, Bahadurnagar, Okara, Pakistan
M. A. Chaudhry
Affiliation:
Livestock Production Research Institute, Bahadurnagar, Okara, Pakistan
J. Philipsson
Affiliation:
Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden
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Abstract

The present study was undertaken to assist conservation and improvement schemes in the Sahiwal breed of cattle in Pakistan. A data set, consisting of records of 244 pure Sahiwal breeding bulls and 5247 cows, the latter representing about 80% of all recorded Sahiwal cows in Pakistan born during a period covering about 20 years, was analysed with regard to inbreeding, additive relationships, effective population size and generation intervals. Average inbreeding coefficients of 1224 cows and 49 bulls, for which at least the grandparents and great-grandsires were known, were 0·043 and 0·046, respectively. About two-thirds of the inbreeding was due to matings between animals with parents or grandparents in common. The mean additive relationship among the cows was 0·062, with within-herd averages ranging from 0·087 to 0·358. The average population size in a subdata set of recorded Sahiwal cattle from 1980 to 1984 was 1612, whereas the most likely estimate of the effective population size was about 30 animals for the same active breeding population. The study indicated the immediate need for an active conservation programme whereby the Sahiwal subpopulations of India and Kenya also should be involved.

Keywords

generation intervalinbreedingpopulation structurerelationshipsSahiwal
Type
Research Article
Information
Animal Science , Volume 60 , Issue 2 , April 1995 , pp. 163 - 168
Copyright
Copyright © British Society of Animal Science 1995

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References

Ahmad, Z., Ahmad, M. D. and Qureshi, A. W. 1974. Influence of inbreeding on performance traits of Sahiwal cattle. Journal of Dairy Science 57: 1225–1227.CrossRefGoogle Scholar
Ahmad, Z., Ahmad, M. D., Qureshi, A. W., Gill, R. A. and Fahmy, S. K. 1978. Genetic progress through selection in performance traits of Sahiwal cattle. Agricultural Research Review, Egypt 56: 1–6.Google Scholar
Aslam, M. and Ahmad, M. D. 1969. Effect of inbreeding on milk yield in Sahiwal cows. Journal of the College of Animal Husbandry, Lahore, Pakistan 1: 21–24.Google Scholar
Chaudhry, M. Z. 1988. Progeny testing of Sahiwal bulls. Journal of Animal Health and Production, Pakistan 8: 64–71.Google Scholar
Crow, J. F. and Denniston, C. 1988. Inbreeding and variance effective population numbers. Evolution 42: 482–495.CrossRefGoogle ScholarPubMed
Directorate of Livestock Production Research Institute. 1985. Sixth annual report 1984-85. Directorate of Livestock Production Research Institute Bahadurnagar, Okara, Pakistan.Google Scholar
Falconer, D. S. 1981. Introduction to quantitative genetics. 2nd ed. Longman, Harlow.Google Scholar
Food and Agriculture Organization. 1980. Animal genetic resources conservation and management. Report of the FAO/UNEP Technical Consultation held in Rome, 1980. Food and Agriculture Organization of the United Nations, Rome.Google Scholar
Food and Agriculture Organization. 1992. Expert consultation on the management of global animal genetic resources. Food and Agriculture Organization of the United Nations, Rome.Google Scholar
Gandini, G. C., Bagnato, A., Miglior, F. and Pagnacco, G. 1992. Inbreeding in the Italian Haflinger horse. Journal of Animal Breeding and Genetics 109: 433–443.CrossRefGoogle Scholar
Henson, E. L. 1992. In situ conservation of livestock and poultry. FAO animal production and health paper no. 99. Food and Agriculture Organization of the United Nations, Rome.Google Scholar
Hodges, J. 1987. Sahiwal in Kenya and Pakistan. In FAO animal production and health paper no. 66. Food and Agriculture Organization of the United Nations, Rome.Google Scholar
Joshi, N. R. and Phillips, R. W. 1953. Zebu cattle of India and Pakistan. FAO agricultural studies no. 19. Food and Agriculture Organization of the United Nations, Rome.Google Scholar
Livestock Census. 1989. Pakistan livestock census 1986. Agricultural Census Organization, Government of Pakistan, Lahore, Pakistan.Google Scholar
Maule, J. P. 1990. The cattle of the tropics. University of Edinburgh Centre for Tropical Veterinary Medicine, Edinburgh.Google Scholar
Pirchner, F. 1985. Genetic structure of populations. 1. Closed populations or matings among related individuals. In World Animal Science, A4 General and quantitative genetics (ed. Chapman, A. B.), pp. 227–250. Elsevier, Amsterdam.Google Scholar
Quaas, R. L. 1976. Computing the diagonal elements and inverse of a large numerator relationship matrix. Biometrics 32: 949–953.CrossRefGoogle Scholar
Reddy, K. M. and Nagarcenkar, R. 1989. Incidence of inbreeding among Sahiwal cattle. Indian journal of Dairy Science 42: 289–294.Google Scholar
Rege, J. E. O. and Wakhungu, J. W. 1992. An evaluation of a long-term breeding programme in a closed Sahiwal herd in Kenya. II. Genetic and phenotypic trends and levels of inbreeding. Journal of Animal Breeding and Genetics 109: 374–384.CrossRefGoogle Scholar
Wright, S. 1922. Coefficients of inbreeding and relationship. American Naturalist 56: 330–338.CrossRefGoogle Scholar