TAILIEUCHUNG - báo cáo khoa học: "Direct and correlated responses to selection for and small 6-week body weight in mice"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Direct and correlated responses to selection for and small 6-week body weight in mice | Génét. Sél. Evol. 1987 19 4 445-458 Direct and correlated responses to selection for large and small 6-week body weight in mice Yolanda BAYON . FUENTE and F. SAN PRIMITIVE Departamento de Production Animal Universidad de León León Spain Summary A selection experiment based on individual performance for large w and small W 6-week body weight was conducted for 15 generations in mice. A 3rd line c was maintained as an unselected control. Direct responses measured as deviations from the control line were similar in w g and w - g . Realized heritabilities for 6-week weight were in w in w and for divergence. Correlated responses for 3-week body weight did not show asymmetry the corresponding values being g and g for upward and downward selection respectively. Realized genetic correlations were between 6-week and 3-week weight and between 6-week weight and 3-6 week gain. Litter size at 1st 2nd and 3rd parity was hardly modified in the upward selection W whereas it was considerably reduced in the downward selection W- . Realized genetic correlations estimated from the divergence were between 6-week weight and first litter size and between 6-week weight and the total number of young born in the first 3 births TNY-3 . Key words Mice body weight selection litter size. Resume Réponses directe et corrélée à une selection divergente sur le poids corporel à 1 âge de six semaines chez la souris Une experience de selection divergente sur le poids individuel à l âge de 6 semaines a été conduite pendant 15 generations chez la souris lignée haute w lignée basse w . Une 3e lignée non sélectionnée C a été maintenue comme témoin. Les réponses directes mesurées en déviations par rapport à la lignée témoin sont similaires dans les lignées w 10 63 g et w 9 23 g . Les heritabilites réalisées du poids à 6 semaines sont de 0 27 0 02 dans la lignée w 0 29 0 02 dans la lignée w et 0 28 0 01 pour la .

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