Desired-gain selection indices for improving performance of two Tanzania local chicken ecotypes under intensive management.
作者： J. Lwelamira , G. C. Kifaro
DOI: 10.5897/AJAR09.103
关键词:
摘要: A study was carried out to evaluate various desired-gain selection indices (Yamada index) in improving performance of two chicken ecotypes Tanzania viz. Kuchi and Medium (Medium). The for ecotype were geared at body weight 16 (Bwt16) weeks age while those egg production related traits. These traits included first (AFE), the 90 days after sexual maturity (EN-90) (EW). Apart from traits, antibody responses (Ab) against Newcastle disease virus vaccine also some both ecotypes. Furthermore, correlated quality namely shape index (ESI) eggshell thickness (STH) studied. Results indicated that it would take between 5 6 generations improve Bwt16 either singly or together with Ab their current levels 1394 g (HIlog2) desired averages 1800 (HIlog2), respectively. On other hand results 8 11 AFE EN-90 EW them 168 days, 49 eggs, 42 154 68 50 g, Based on number required achieve gains responses, recommended. Key words: Breeding, gain, local chicken, indices.
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