Comparative Studies on Growth and Meat Production of Ducks (Mallard, Cherry Valley and Their Crossbred) Free-Ranged in Paddy Fields.
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概要
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The growth and production of meat in 3 breeds of ducks, i.e. Mallard, Cherry valley and their crossbred (F1) were compared in order to select breeds more profitable for paddy rice cultivation using ducks. Three paddy fields were used for this study and 8 ducklings on the 1 st day posthatching were allocated to each paddy field (4.5a) at the 1 st week after rice-planting. The animals were kept until 11 weeks of age in the paddy fields, and then fattened with feed formula for layer in pens until 20 weeks of age. Three control groups (3 breeds) each consisting of 8 ducks were housed and provided with the same feed formula as above. The results obtained were as follows: 1. Final body weight at 20 weeks of age tended to be greater in the order, Mallard, F1, Cherry valley for both free-ranged and housed ducks.2. Free-ranged Cherry valley had a tendency to be slower in overall growth rate than housed animals, however the overall growth rates of free-ranged Mallard and F1 did not differ from those of housed animals.3. There were no significant differences in dressing percentage of ducks among breeds and between free-ranged and housed conditions. Abdominal fat showed a tendency to be more in the order, Mallard, F1, Cherry valley.4. The results of sensory test suggested that F1 meat was most palatable and Cherry valley least.5. The results of the present study suggested that F1 meat was most profitable in the 3 breeds of ducks for paddy rice cultivation using ducks
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