屋外放飼したセイヨウガチョウならびにシナガチョウの産卵能力の比較

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  • Comparison of Egg Production between Anser anser domesticus and A. cygnoides domesticus under the Free-ranging Condition
  • オクガイ ホウシ シタ セイヨウ ガチョウ ナラビニ シナ ガチョウ ノ サンラン ノウリョク ノ ヒカク

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To obtain fundamental information on the effective use of geese for sustainable vegetation management on agricultural lands, an experiment comparing the egg productivity between Anser anser domesticus (♀5, ♂2: WT) and A. cygnoides domesticus (♀5, ♂2: CN) from January to June in 2009 was conducted. The two kinds of geese were free-ranged separately in each outdoor corral (1 a), and they were provided with formula feed (CP:16.0%, ME:2,850 kcal/kg) ad libitum. Egg production rate, egg quality, hatchability and rate of raising were compared between WT and CN geese. The egg production rate (hen day's average) of CN geese during the experimental period was 30.1 %, which was significantly higher than that (23.3%) of WT geese (P<0.01). The average egg weight of WTgeese was larger than that of CN geese (P<0.01). As for egg quality, percentages of the yolk, albumen and shell weight to total egg weight, color fan scores of egg yolks, shell thickness and eggshell strength were not significantly different between WT and CN geese. The CN geese had a tendency of higher fertility of eggs comparing WT geese (89.5 vs. 78.0%) (P<0.10), however there was no significance in the hatchability of fertilized eggs between WT (65.9%) and CN (72.0%) geese. Although no significant differences were found in the rate of raising between WT and CN geese, feather-peckingw as frequently observed in both geese. These results indicated that CN geese had higher gosling productivity compared with WT geese.

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