The present study involves dwarf pullets carrying sex- linked recessive dw gene having diversified polygenic status obtained from similar genetic background. The performance of these dw pullets were compared with non-dwarf sibs. The polygenic inheritance of both broiler populations was 87.5 broiler and 12.5 dwarf Leghorn, which was obtained by successive back crossing of heterozygous dwdw+ cockrels with non-dwarf dw+ pullets.
Dwarf egg layer was synthesized from the same gene pool as that of two broiler populations except that 75..0 Broiler : 25 dwarf Leghorn, males were mated with females of White Leghorn control line to arrive at a polygenic combination of 37.5 broiler J 50 White Leghorn : 12.5 dwarf Leghorn. This seggregating population was further developed in to true breeding dwarf egg population and named Narmada-XI which has a broad genetic base.Apart from broiler it inherits gene pool of six White Leghorn strains which were utilized to synthesized the control line.
A total number of 281 survived pullets of three genotypes from a single hatch i.e. Narmada-Xl (130), dwarf broiler (103) and normal broiler (43) wees utilized in the presentation of the data. Pullets at 17 weeks of age were housed in individual cages and were fed mash containing 18 per cent crude protein and 2850 Kcal/metabolizable energy per kg feed. Fourteen hours light was provided. Data on egg production was recorded on individual bird basis from 21st to 40th week of age. Body weights were also recorded at 20, 30 and 40-week of age.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 853-856, 1982
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