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Phenotypic and genetic characteristics of growth of Peking ducklings under Egyptian conditions
Published online by Cambridge University Press: 27 March 2009
Summary
Peking ducklings were classified at 6 weeks of age according to their body weights in two categories: R, below the overall mean of the flock which were considered as retarded growth; and L, those of body weight equal to the overall mean and above which were considered as large. From each group, males and females were chosen to be parents of the next generation in a ratio 1:5 at 6 months of age and four systems of matings were conducted: RR, LL, RL and LR.
At all ages studied the large ducklings were significantly heavier than retarded growth ones and had significantly greater body gain, during the two successive generations.
The RL and LR matings were heavier than the RR and LL groups at the different ages studied, indicating an effect of heterosis and that the retarded growth character is controlled by few pairs of genes. The differences due to mating systems were not significant either in body weight or body gain, except in body weight at 18 and 24 weeks and relative gain at 6 weeks of age in which the differences were significant (P <0·05) in the second generation.
The other environmental factors studied were sex, month of hatch and 6-week body weight.
Heritability estimates were 0·489, 0·509, 0·576, 0·346, 0·713, 0·809, 0·651 and 0·386 for body weight at hatch 4, 6, 8, 12, 16, 18 and 24 weeks of age, respectively, using the data which were adjusted for the effects of sex, month of hatch, 6-week body weight and mating system. The same estimates were 0·482, 0·554, 0·578, 0·352, 0·713, 0·808, 0·650 and 0·386, respectively, using the same data but adjusted for month of hatch and sex only.
Phenotypic and genetic correlations between body weights at different ages for the two sets of data were estimated. The phenotypic correlations were negative between body weight at hatch and each of the body weights at 16 and 18 weeks of age for the two corrected sets of data. The genetic correlations were negative between hatch weight and each of the other body weights for the two adjusted sets of data and between body weight at 4 weeks of age and each of the body weights at 16, 18 and 24 weeks only for the first set of data. Phenotypic and genetic correlations between the body weights in older birds were highly positive.
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- Copyright © Cambridge University Press 1988
References
Amer, M. F., El-Ibiary, H. M., Khsin, S. S. & Issawi, H. F. (1964). A comparative study of Egyptian strains of chickens and three standard breeds imported from Holland. 2. Chick body weight at different ages. Alexandria Journal of Agricultural Research 12 (2), 311–321.Google Scholar
Ann, A. H. & James, E. H. (1976). Metabolic responses of white Pekin ducks to ambient temperature. Poultry Science 55, 1899.Google Scholar
Ash, W. J. & Nothers, P. (1964). Sex differences in economic traits of Long Island White Pekin market ducklings. Nature, London 201, 271–272.CrossRefGoogle Scholar
Bazanova, N. S. (1974). Breeding and productive value of Cherry Valley crossbred ducks. Sbornik Nauchnykh Trudov. Moskovskay Veterinarnaya Akademiya 76, 203–204.Google Scholar
Becker, W. A. (1975). Manual of Quantitative Genetics, 3rd edn.Pullman, Washington: Washington State University Press.Google Scholar
Bumgardner, H. L. & Shaffner, C. S. (1954). The heritability of body weight in turkeys. Poultry Science 33, 601–606.Google Scholar
Clayton, G. A. & Robertson, A. (1966). Genetics of changes in economic traits during laying year. British Poultry Science 7, 143–151.CrossRefGoogle Scholar
Elford, F. C. (1926). Duck feeding experiments. Dominion Poultry Husbandman 1925 (Ottawa, Canada), p. 49.Google Scholar
Falconer, D. S. (1960). Introduction to QuantitativeGenetics. London: Oliver and Boyd.Google Scholar
Funk, E. M. (1930). Rate of growth in Bronze and White Holland Turkeys. Poultry Science 9, 343–355.Google Scholar
Gupta, N. D. & Johar, K. S. (1975). Early body weight of five strains of White Leghorn. British Poultry Science 16, 593–598.Google Scholar
Harvey, W. R. (1964). Least Squares Analysis of Data with Unequal Subclass Numbers. Agricultural Research Service, United States Department of Agriculture.Google Scholar
Hataba, N. A. (1980). Heterosis within Fayoumi chickens. M.Sc. thesis, Faculty of Agriculture, Ain-Shams University, Cairo, Egypt.Google Scholar
Hetzel, D. J. A. (1982). A note on the differences in growth and tissue deposition of crosses between pekin and Muscovy drakes and Alabio ducks. In Proceedings of the Third Conference, Australian Association of Animal Breeding and Genetics, Brisbane, Australia, pp. 201–.Google Scholar
Kadry, A. E. (1971). Heritability and repeatability of some physical wool characteristics of Barki. M.Sc. thesis, Faculty of Agriculture, Al-Azhar University, Egypt.Google Scholar
Kamar, G. A. R. (1962). Growth of various breeds of ducks under Egyptian conditions. Poultry Science 41, 1344–1346.CrossRefGoogle Scholar
Kamar, G. A. R., Mostageer, A. & Gohar, N. E. (1969). Effect of crossing on the productivity of duck. 1. Growth. Journal of Animal Production, United Arab Republic 9, 251–261.Google Scholar
Kamar, G. A. R. & Yamani, K. A. O. (1980). Differential growth in the different organs of ducks. Egyptian Journal of Animal Production 20 (1), 41–53.Google Scholar
Kiss, I. (1969). Investigation into the growth of domestic duck and its race hybrids. Budapest. Akademiai Kiado, pp. 171–175. Department of Animal Husbandry, University of Agricultural Science, Godollo.Google Scholar
Kogan, M. M. (1974). Growth and development of ducklings at different stocking rates. Nauchnge Osnovy Razvitiya Zhivotnovodstva V BSSR 4, 117–119.Google Scholar
Konovalov, V. I. (1975). Relation of production and reproduction in ducks to plane of feeding. Zhivotnovodstvo 6, 61–63.Google Scholar
Kozlowski, M. (1976). Potato silage and rapeseed oilmeal for fattening broiler ducks. 1. Growth and carcass quality. Roczniki Nauk Rolniczych, B 98 (1), 67–81.Google Scholar
McCartney, M. G. (1961). Heritability and genetic correlations of body weights of White Holland turkeys. Poultry Science 34, 617–621.Google Scholar
Mahmoud, R. M. (1985). Effect of using rations differing in energy and protein levels on the performance of Pekin ducks. M.Sc. thesis, Faculty of Agriculture, Zagazig University, Zagazig, Egypt.Google Scholar
Nestor, K. E., McCartney, M. G. & Harvey, W. R. (1967). Genetics of growth and reproduction in the turkey. 1. Genetic and nongenetic variation in body weight and body measurements. Poultry Science 46, 1374–1384.Google Scholar
Oplt, J., Petkovova, R., Jindrich, V. & Fiedler, J. (1974). The effect of egg weight on fattening performance of ducks. Náš chov 34 (2), 55–56.Google Scholar
Pilla, A. M. (1974). Possibility of genetic improvement in the Muscovy duck. Zootecnia 7, 165–174.Google Scholar
Steklen'ov, E. P., Kromin, V. S. & Gavrish, A. P. (1976). Meat production of Muscovy × Pekin hybrid ducks. Visnik sil's Kogospodars Koi Nauki 59 (2), 103–121.Google Scholar
Wilson, B. J. (1972). Growth of ducklings fed on diets containing field beans (Vicia faba). British Poultry Science 13, 405–409.Google Scholar
Wilson, B. J. (1975). The performance of male ducklings given starter diets with different concentrations of energy and protein. British Poultry Science 16 (6), 617–625.CrossRefGoogle Scholar
Yamani, K. A. O. (1963). Developmental changes in body organs, glands and tissues of ducks. M.Sc. thesis, Faculty of Agriculture, Cairo University, Egypt.Google Scholar