２回強制換羽した採卵鶏の換羽飼料が換羽後の産卵性能に及ぼす影響の比較

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  • Comparison of Effects of Molt Diets on Postmolt Egg Production Performance of Two Times Molted Laying Hens.
  • 2カイ キョウセイ カンウシタ サイランケイ ノ カンウ シリョウ ガ カンウ

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A comparison was made of the effects of layer and corn with 2% fish meal diets as molt diets on egg production performance of laying hens. Four lines of commercial White Leghorn laying hens hatched at summer or autumn were induced to molt at 73 and 118 weeks of age by fasting. Feed consumption, body weight, laying performance and egg quality after fasting were studied.<br>Hens fed a layer diet as a molting diet consumed more feed, recovered body weight and began to lay sooner, and egg production rate in the first molting was higher, compared to corn with fish meal diet hens. In the second molting, hens fed the corn with fish meal diet laid more eggs, although hen day egg production was less than 60% in both treatments. Egg weight was the same for both diets. Hen fed the corn with fish meal diet had stronger egg shells, lower cracked egg production and a higher Haugh unit value.<br>The layer diet was thus shown satisfactory as a molt diet for egg production after molting in the case of the first induced molt at 73 weeks of age. The corn with fish meal diet led to superior results in high egg shell quality. This diet was also superior as a molt diet when hens were induced to the second molting at 118 weeks of age, although no economical advantage could be expected.

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