水田に放飼した合鴨の成長と行動

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タイトル別名
  • Growth and Behaviour of Aigamo Ducks(Crossbred of Wild and Domestic Ducks) in Paddy Fields.
  • スイデン ニ ハナシガイシタ アイガモ ノ セイチョウ ト コウドウ

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説明

This study was conducted to elucidate the growth and behaviour of Aigamo ducks in paddy fields. Thirty Aigamo ducks were introduced to the paddy field (10 a) on 4 weeks of age at the second week after rice-planting. Twenty-two Aigamo ducks were housed with formula feed for the late stage of broiler as control experiment. The body weight, tibia length, beak length and body length were measured once every week. The patterns of behaviour of 5 Aigamo ducks in paddy field were observed for 24 hours.<br>Final body weight and daily gain of Aigamo ducks kept in paddy field were 976g and 8.3g, respectively, and those of Aigamo ducks housed in pen were 970g and 8.2g, respectively. Consequently, the body weight gains were not different between two treatments. Moreover final body length, tibia length and beak length were not different between two treatments.<br>Feed intake behaviour showed three peak for 24 hours, namely at 2∼3p.m., 9∼11p.m. and 2∼7a.m., and that at 2∼7a.m. showed the highest among the three peaks. Resting behaviour showed two peaks for 24 hours, namely 8∼10p.m. and 5a.m.∼2p.m., and that at 5a.m.∼2p.m. showed higher. These results indicated that Aigamo ducks were nocturnal in their habits as wild ducks.

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