ランオウ ノ チャクショク ニ カンスル ケンキュウ 4 キサントフィルザイ フロラフィル テンカ ノ コウカ

P(論文)Florafil is a preparation of xanthophyll which was made from petals of a species of Calendula in Mexico. To determine the effects of Florafil on the pigmentation and the contents of vitamin A, provitamin A and xanthophyll of egg yolk, a feeding experiment for 10 weeks with laying hens (Rock horn breed) was carried out. Seven lots of the milo (60%) diet with 3% alfalfa meal (A_3), with 0.25% Florafil (F_), with 0.5% Florafil (F_), with 0.25% Florafil plus 3% alfalfa meal (A_3F_), and of the control diet without additive (M), of the yellow corn (60%)(C) and of the yellow corn diet with 0.25% Florafil (CF_) were set up in bateries (cf. Tab. 1). The feeding experiment consisted of 3 periods : in the first period the milo diet was fed, except the CF_ lot ; in the second period the experimental diets were fed respectively ; and in the third period the milo diet was fed except CF_ lot, while hens of the M-lot were fed the milo diet during the total periods. Egg yolk color value was evaluated by Roche 10 blade color fans. Of each sample of the egg yolk in each lot, vitamin A, provitamin and xanthophyll were chemically estimated (cf. Fig. 1). The results obtained were summarized as follows : 1) Feeding of the milo diet lowered the color value from 8 to 3 in 12 days. In comparison with this, egg yolk of corn diet-lot maintained the color values at 8-10. 2) Egg yolk of A_, F_, F_ and A_3F_ lots had considerable or high color values and gave a proper constant color value in 10 to 14 days after the feeding of experimental diet respectively. Order of color value of egg yolk : CF_>C>F_>A_3F_>A_3>F_>M The egg yolk of CF_lot indicated a higher value than 10 of color fan. 3) The vitamin A content was somewhat increased by addition of Florafil. 4) The increase of provitamin A content of egg yolk by application of Florafil or alfalfa meal was observed. 5) In the application of Florafil to the diet, the xanthophyll content of egg yolk was 5 times in A_, 4 times in F_, 8.4 times in F_, 10 times in A_3F_ and 12.4 times in CF_ lot as much as that in the milo diet lot. In the practial formula feed, it may possibly regulate the pigmentation of egg yolk by the application of Florafil lower level than 0.25%. Florafil is regarded as an available pigmenter of egg yolk.departmental bulletin pape