Feed conversion to body weight gain and egg production in large and small Japanese quail lines selected for 6-week body weight.
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概要
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The study was designed to investigate the feed conversion to body weight gain and egg production in the large and small lines in Japanese quail. A total of 180 chicks from two selected lines and a control line were used. Two selected lines were the large line (LL) and the small line (SS) selected through 48 generations for high or low 6-week body weight and a control line (RR) was a closed population maintained as a randombred control over a 18 year period in our laboratory.All chicks were brooded in electric battery brooder under continuous lighting and transferred at 2 weeks of age to individual cages in the room kept under 14h. light-10h. dark cycle and at a constant temperature 22°C. The 28% crude protein diets prepared by mixing the commercial quail layer feed with white fish meal were fed ad libitum throughout the experiment. Individual body weights and feed intakes from 2 to 10 weeks of age were measured at weekly intervals, and egg production data were daily obtained during 10 days from 14 weeks of age. The results can be summarized as follows.1) The weekly body weight gains of LL and RR were similar growth pattern and the growth rate of SS was remarkably different from that of LL or RR.2) Significant differences between lines were markedly observed in feed intake from 2 to 10 weeks of age and after sexual maturity feed intakes of female were more than those of male in three lines.3) Feed conversion to body weight gain of LL in early growing stage was the best in three lines and cumulative feed conversion of LL was also superior to that of RR. However, cumulative feed conversion of SS was inferior to that of LL or RR.4) Feed conversion to egg production of RR was the best in three lines, but no significant differences between RR and SS lines in group of higher egg production rate were obtained.5) From these results, it is assumed that feed conversion to body weight gain inLL line was improved by long-term selection for high 6-week body weight, but feed conversion to egg production was decreased, while the performance of body weight gain in SS line was decreased by long-term selection for low 6-week body weight, but no significant differences between RR and SS lines were obtained in group of higher egg production rate.
- 日本家禽学会の論文
日本家禽学会 | 論文
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