TAILIEUCHUNG - Báo cáo sinh học: "Selection on testis size as an indicator of maturity in growing animals. II Correlated responses in reproductive rate"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Selection on testis size as an indicator of maturity in growing animals. II Correlated responses in reproductive rate | Genet Sei Evol 1990 22 247-255 Elsevier INRA 247 Original article Selection on testis size as an indicator of maturity in growing animals. II Correlated responses in reproductive rate WG Hill1 PJ Marks2 JC Jenkins1 RB Land2 t 1 Institute of Animal Genetics University of Edinburgh West Mains Road Edinburgh EH9 3JN 2AFRO Institute of Animal Physiology and Genetics Research Edinburgh Research Station Roslin Midlothian EH25 9PS UK Received 2 October 1989 accepted 15 February 1990 Summary - Selection was undertaken in replicated lines of mice for 11 generations high and low on 5 wk body weight HX LX on 5 wk testis weight XH XL and on indices in which body and testis weight were selected in the same HH LL and in opposite directions HL LH . There were correlated responses in number born in the 1st litter with differences between pairs of lines averaged over replicates and the last 5 generations of HX-LX XH-XL HH-LL HL-LH each with standard error of . The control mean litter size was . Differences were only partly removed by phenotypic correction for body weight and limited data indicated that ovulation rate responded little more than litter size Previous experiments suggesting that litter size can be changed by selecting on testis size are confirmed but some of this response is associated with body weight change. reproduction growth testis selection mouse Résumé Selection sur la taille des testicules considérée comme un indicateur de la maturỉté des animaux en croissance. II Réponses corrélées sur les performances de reproduction. Une experience de sélection chez la souris a été conduite pendant 11 générations vers le haut H et vers le bas L selon plusieurs critères masse corporelle chez le male à 5 semaines íignées HX LX masse testicúlaire à 5 semaines XH XL indices combinant ces deux caractères dans le même sens HH LL OU en sens opposes HL LH . Chaque expérience a été répétée 2 fois. Des corrélations entre le nombre d animaux nés en premiere .

• Báo cáo khoa học
• Báo cáo sinh học hay
• cách trình bày báo cáo
• báo cáo sinh học
• công trình nghiên cứu sinh học
• tài liệu về sinh học