Heterosis for growth in reciprocal crosses of highly inbred lines of Japanese quail.

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Heterosis effect for growth of crossbreds between highly inbred lines of Japanese quail was examined. Materials consisted of two inbred lines (OO and TT), their reciprocal crosses (TO and OT) and a randombred population. Two inbred lines were established by consecutive full-sib mating through 12 generations (F=0.925). Crossbreds were obtained from the reciprocal crosses (TO:TT males×OO females and OT:OO males×TT females). Chicks were hatched and bred according to the usual methods practiced at Okayama University.Individual chicks were weighted at weekly intervals up to 16 weeks of age.Gompertz growth curves were applied to analyze the differences in growth traits among the five quail groups mentioned above.Heterosis effect for growth was observed in the line crosses throughout the growth period. Heterosis effect in the early growth period (1 to 5 weeks of age for males and 2 to 7 weeks for females) was especially remarkable but not found at 0 week (hatching time). A difference in female body weight was observed between the crossbreds, TO and OT. This difference was considered to be partly due to maternal effect. Analysis with the Gompertz growth curve showed that the growth rate of the crossbreds was higher than that of the original inbred lines throughout the growth period.
日本家禽学会の論文