性腺刺激抑制剤による産卵抑制の効果

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  • Forced Molting in Pullets and Its Effect on Subsequent Egg Production in Layers
  • セイセン シゲキ ヨクセイザイ ニ ヨル サンラン ヨクセイ ノ コウカ

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Effects of forced molting induced by methalibure administered either at 3 months or 7 months after the age of 50% egg production upon subsequent egg production were investigated.<br>In the group treated at earlier age the level of egg production after the recovery from temporal cessation of egg laying was more or less similar to that of non-treated control, while the group treated at older age showed a marked rebounding of egg production and continued higher production level throughout the testing period (Fig. 2).<br>Approximately 10% increase in the income through egg marketing can be expected by the use of forced molting conducted at 7 months after the age of 50% production, when the price of eggs is lowest.<br>The degree of molting by methalibure administration seems to be dependent on the age of pullets or the stage of egg production, since the molting appeared in the primary feather was less severe in the group treated at the earlier age and the recovery to 50% production was hastened in this group in comparison with the group treated 4 months later.

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