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Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Genetic parameters of spontaneous spring ovulatory activity in Mérinos d’Arles sheep Hanocq Loys Bodin Jacques Thimonier Jacques Teyssier Benoit Malpaux Philippe Chemineau | Genet. Sei. Evol. 31 1999 77-90 Inra Elsevier Paris 77 Original article Genetic parameters of spontaneous spring ovulatory activity in Merinos d Arles sheep Eric Hanocqa Loys Bodin a Jacques Thimonierb Jacques Teyssierb Benoit Malpauxc Philippe Chemineauc a Departement de génétique animale Station d amelioration génétique des animaux Institut national de la recherche agronomique 31326 Castanet-Tolosan France b Unite de zootechnie méditerranéenne École nationale supérieure agronomique de Montpellier - Institut national de la recherche agronomique 34060 Montpellier France c Neuroendocrinologie sexuelle Physiologie de la reproduction des mammiferes domestiques Institut national de la recherche agronomique 37380 Nouzilly France Received 23 July 1998 accepted 5 November 1998 Abstract - The genetic parameters of spontaneous spring ovulatory activity were investigated in the Merinos d Arles breed under the usual pastoral and transhumant management conditions of this breed in southeastern France. Ovulatory activity was determined by assaying the plasma progesterone concentration in two blood samples taken 8-10 days apart. The data set consisted of 1 887 ovulatory activity performance measurements in 1995 1996 and 1997 on 933 ewes daughters of 176 rams. The effects of the physiological status hoggets adult ewes with or without lambing in the previous autumn age and live weight just before the mating period were found to be highly significant. They were included in the linear animal model and the threshold sire model used to estimate genetic parameters. On average 27.9 of ewes exhibited ovulatory activity in April. Age and live weight just before the mating period had a marked positive effect on ovulatory activity. A difference of about 8-9 was observed between extreme classes for these factors. The heritability and repeatability estimated through the linear model were 0.20 standard error 0.04 and 0.30 0.07 respectively. When using the threshold model the heritability was .
