By William J. A. Payne, R. Trevor Wilson
The 5th version of this publication has been thoroughly revised and taken up to date, with a brand new co-author. it's nonetheless the main authoritative and finished e-book at the improvement and creation of household farm animals within the tropics.
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Extra info for An Introduction to Animal Husbandry in the Tropics
The recessive gene for silky (h), which affects the barbules on the feathers, may improve the ability to dissipate heat. The dominant gene for peacomb (P) reduced feather tract width, reduced comb size and changed skin structure. These may improve the ability to dissipate heat. The recessive, sex-linked, multiple-allelic locus for dermal melanin (id) may improve radiation from the skin. However, to date no serious investigations have been reported on the use of these genes to develop heat tolerance in commercial-type birds.
Several crosses were made to produce comparable Na na and na na progeny. These progeny were tested under Israel spring and summer conditions, where the temperature ranged between 31 and 22°C. All five flocks tested showed that the 7-week broiler weight of the Na na birds was higher than that of the na na birds. Samples that were tested under a controlled, constant high temperature (32°C) showed the same results. These studies are important as they show that the wide range of benefits of the Na gene demonstrated previously for various relatively slow-growing stocks (see Merat, 1986, 1990) are applicable to stocks that grow in the range of the modern commercial broiler.
386–388. , Horst, P. V. (1992) Genetic and economic relevance of the autosomal incompletely dominant Frizzle gene (F). Proceedings of the 19th World’s Poultry Congress, Amsterdam, the Netherlands, Vol. 2, p. 66. Hartmann, W. (1990) Implications of genotype–environment interactions in animal breeding: genotype–location interactions in poultry. World’s Poultry Science Journal 46, 197–210. Hartmann, W. (1992) Evaluations of the potentials of new scientific developments for commercial poultry breeding.