TAILIEUCHUNG - Báo cáo khoa hoc:" Genetic relationship between cyclic ovarian activity in heifers and cows and beef traits in males"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Genetic relationship between cyclic ovarian activity in heifers and cows and beef traits in males | Genet Sei. Evol. 33 2001 273-287 INRA EDP Sciences 2001 273 Original article Genetic relationship between cycIìc ovarian activitY in heifers and cows and beef traits in males Marie-Madeleine Mialona Gilles Renanda Daniel Kraussb Francois Ménissiera a Station de génétique quantitative et appliquée Institut national de la recherche agronomique 78352 Jouy-en-Josas Cedex France b Domaine expérimental de Galle Institut national de la recherche agronomique 18520 Avord France Received 19 July 2000 accepted 3 January 2001 Abstract - Records were collected in an experimental herd over an 11-year period from purebred Charolais heifers n 351 cows n 615 and young entire bulls n 383 . The objective of the study was to estimate the genetic relationship between the components of female ovarian activity age at puberty and postpartum anoestrus length their growth rate and body condition score and beef traits measured on related bulls. Two methods were used to estimate age at puberty and postpartum anoestrus length the detection of oestrous behaviour and a test of cyclicity based on plasmatic progesterone assay. This study shows the existence of significant heritability estimates for the different cyclicity traits h2 between and . Most of the genetic correlation coefficients between ovarian activity and growth rate of females and males are negative and favourable Rg between and . Cyclicity is also favourably related with body condition score in young or adult females Rg between and . The genetic relationship between female ovarian activity and proportion of adipose tissue in the male carcass is however close to zero. These results show that an antagonism between male beef traits measured in this study and female ovarian activity is unlikely to be a cause for concern in the short term. genetic relationships ovarian activity beef-traits cattle 1. introduction The primary objectives in French beef cattle breeding are to improve growth rate and production .

• 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