ランオウ ノ チャクショク ニ カンスル ケンキュウ 2 クロレラ テンカ ノ コウカ

P(論文)To determine the effect of addition of chlorella, a feeding experiment with laying hens (White Leghorn breed) was carried out. Three lots of the control of the milo (60%) diet without any additive, of the milo diet with 5% chlorlla and of the milo diet with 20 ppm carophyll orange (CO ; a preparation of 5% β-apo-8'-carotenoic aicd ethyl ester plus 5% canthaxanthin) were set up in batteries. The feeding experiment for 70 days in total consisted of 3 periods ; in the first period the milo diet was fed, in the second the experimental diet and in the third the milo diet (c. f. Fix. 1). Egg yolk pigmentation was evaluated by Roche 15 blade color fans and also the contents of vitamin A, carotene and xanthophyll were etimated. The results obtained are summarized as follws : 1) Feeding of the milo diet caused a decrease of the Roche color fan value of egg yolk. 2) The color value of the yolk in the egg laid by birds fed the chlorella diet increased to 12-13,while that of the CO-diet birds increased to 11-12. A remarkable effect of pigmentation was shown. 3) The vitamin A content of the chlorella diet lot was somewhat higher than that of the CO-diet lot. It was suggested that the application of chlorella to laying diet might be useful for the improvement of vitamin A content. 4) The increase of carotene content of egg yolk was observed when chlorella was applied. The carotene content of egg yolk of the chlorella diet lot was about 3 times as much as that of the milo diet lot. 5) A remarkable increase of xantnophyll content of egg yolk was observed when cnlorella was applied. 6) It was observed that the application of 5% chlorella did not influene egg production, feed consumption and other egg qualities.departmental bulletin pape