飼料用米の給与が合鴨の卵肉生産に及ぼす影響

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  • The Effects of Feeding Paddy Rice as Feed to Aigamo Ducks on Their Meat and Egg Production
  • シリョウヨウマイ ノ キュウヨ ガ アイガモ ノ ランニク セイサン ニ オヨボス エイキョウ

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This study was conducted to compare the meat and egg production of Aigamo ducks between formula feed (control) (ME: 2,850 kcal/kg, CP: 18.0%) and experimental feed replaced 60% of formula feed with paddy rice as feed (PRF) on a dry matter basis (ME: 2,877 kcal/kg, CP: 17.4%). The average body weight (BW) of the ducks fed a PRF diet was 1,673 g at 12 weeks of age, being significantly lower than that of control (2,003 g, P<0.05). As for the carcass characteristics, no significant difference was observed in the dressing percentage between the treatments, though the dressed carcass weight of the PRF group was significantly lower than that of control (P<0.05). The sensory test for breast meats was not significantly different between treatments. The egg production rate (hen day's average) of the PRF group was 27.0%, being significantly lower than that of control (53.4%, P<0.05). The average egg weight of the PRF group was also significantly smaller (P<0.05). As for egg quality, percentages of the yolk, albumen and shell weight to total egg weight, and shell thickness were not significantly different between treatments. The color fan scores of egg yolks were 10.8 and 5.0 for control and the PRF, respectively, showing that the latter was significantly lower (P<0.05). The results indicated that paddy rice as feed could be one of the most promising self sufficient feed for Aigamo ducks, though the diet replaced 60% of formula feed with paddy rice as feed (DM basis) caused a lower meat and egg productivity than the formula feed only.

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