Direct and correlated responses to individual selection for large adult weight in the edible snail Helix aspersa Muller.
A selection experiment for large adult weight based on individual performance was conducted for three generations in Helix aspersa aspersa. A second line was kept as an unselected control line. Direct response measured as deviation from the control line was 3.55 g after three generations of artificial selection, which averaged 13%. Realized heritability was 0.38 +/- 0.04. Correlated responses to selection showed a significant increase in weight after hibernation, mean egg weight and mean weight of newly-hatched snails with selection. For adult age, egg number, and hatching rate, no significant change correlated to selection was found, but this is to be confirmed.
Dupont-Nivet
M
M
Institut National de la Recherche Agronomique, Laboratoire de G¿en¿etique des Poissons, 78352 Jouy en Josas Cedex, France. dnivet@jouy.inra.fr
Mallard
J
J
Bonnet
J C
JC
Blanc
J M
JM
D000818:Animals; D001835:Body Weight / Q000235:genetics*; D001947:Breeding; D005260:Female; D006605:Hibernation / Q000235:genetics; D008297:Male; D010058:Oviposition / Q000235:genetics; D010063:Ovum / Q000502:physiology; D012641:Selection, Genetic; D012908:Snails / Q000235:genetics* / Q000254:growth & development