1. Identification of breeding situation and selection parameter

The production efficiency of poultry in the tropics is still comparitively low. Apart from the widely practised low standard of management the most important inhibiting fac- tor is still the hot and humid climate. This results in a permanent reduction in metabolic heat production and in a depression of feed energy intake as well as performance.
On the other hand it has been shown that certain breeds or genotypes differ considerably in their capacity to adapt to high temperatures (WILSON, 1948; FOX, 1951; XHEI- RELDIN and SHAFFNER, 1957; ROMIJIN and LOKHORST, 1966; CLARK and AMIN, 1965; PETERSEN et al., 1976). Furthermore distinct "between" and "within" population differences in maintaining the level of performance and in survival rates under longterm heat stress have been demonstrated by HORST and PETERSEN, 1975; 1976; PETERSEN and HORST, 1978.

P. Horst

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 887-892, 1982
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