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Báo cáo sinh học: "Egg production albino hens to high and low light intensities during brooding-rearing"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Egg production albino hens to high and low light intensities during brooding-rearing | Genet Sei Evol 1992 24 171-177 Elsevier INRA 171 Original article Egg production response of sex-linked albino sal and colored S hens to high and low light intensities during brooding-rearing A Bordas p Mérat Institut National de la Recherche Agronomique Laboratoire de Génétique Factorielle 78352 Jouy-en-Josas cedex France Received 6 September 1991 accepted 22 January 1992 Summary - In order to study the response of albino genotype to different light intensities sex-linked albino or silver female chicks hatched from heterozygous sires were distributed in 2 windowless chick rooms one with a light intensity of about 1 lux the other receiving 170 lux on average. At the age of 17 weeks all the pullets were submitted to a high level of light intensity of 210 to 480 lux. All the females were given 10 h light per 24 h till 17 weeks then 14 h. Age at first egg of birds receiving high light intensity as chicks was 14 d earlier their hen-day production was slightly superior and their mean egg weight 1.5 g lower as compared to females receiving dim light. On an average the albino gene depressed initial growth retarded age at first egg by 5 d lowered egg weight by 2 g increased hen-day production by 5 and lowered the frequency of pause days. With low light intensity during brooding-rearing hen-day production of the albino hens was 7.5 higher than that of colored females and they gave 12.8 eggs more similarly to a previous experiment. These advantages of albinos were attenuated with high light intensity in the juvenile period. However there were no significant genotype X treatment interactions. hen sex-linked albino egg production I light intensity Résumé Réponse de la production d oeufs de poules albinos sal et colorées S à 1 intensité lumineuse en poussinière. En vue d etudier la réponse du genotype albinos à differentes intensités d eclairement des poussins femelles albinos OU argentés gène lié au sexe issus de pères hétérozygotes ont été répartis dans 2 poussinières sans .