ヒナの成長におけるビタミンB_6の要求性について : (I)ヒナの成長にたいするビタミンB_6・抗生物質併用投与の影響

抄録

The diets added with the single or combined supplementation of 4〜6 mg of pyridoxine hydrochloride and 20 mg of antibiotic "Achromycin" per kg were given for 3〜6 weeks to male White Leghorn chicks of seven days old, and the influences of these substances on the growth of chicks were examined. The basal diet consisted of ground corn, soybean oil meal, fish meal, minerals, liver oil and vitamin B mixture devoid of pyridoxine. During 3〜6 weeks trials, the single supplementation of 4,8,16 mg of pyridoxine hydrochloride or 20 mg of Achromycin and the combined supplementation of 4〜6 mg of pyridoxine hydrochloride with 20 mg of Achromycin improved the growth of chicks. The increase of their body weight showed 5〜10%, 5〜10% and 10% in the group which was given pyridoxine hydrochloride only, and in the group of the combined supplementation of pyridoxine hydrochloride with Achromycin, each group showed 10% over the control. The increase of body weight of chicks given the single doses of 20 mg of Achromycin is almost the same as that of 4 mg of pyridoxine hydrochloride. Vitamin B_6 contents of this basal diet were determined as 5.2 mg/kg by the microbiological method using Saccharomyces carlsbergensis. As the results, authors concluded that White Leghorn chicks require 8.5 mg of pyridoxine per kg of ration for their good growth.