烟酸在肉仔鸡体内的利用

THE UTILIZATION OF NIACIN IN BROILERS

雏鸡嗉囊注射3H-烟酸后,肝脏、血液中的~3H-烟酰胺下降到最大值的1/2的时间分别为19和41h,下降到最大值1/5的时间分别为78和169h。每kg饲料内添加15～60mg烟酸,并不影响肉仔鸡对烟酸的利用率,添加量高者,可以得到较高绝对数量的利用。烟酰胺在鸡体内分布较均匀,无明显贮存器官。

The experiment was conducted to investigate the distribution,storage and utilization of niacin in broilers.125 Arbor Acre broilers were used for two treatments.For Treatment 1,80 chicks was injected with 20μCi of 3H-niacin when they were 15 days old.For treatment 2.45 chicks were subdivided into 3 groups with injections of 15,30 and 60 mg/kg niacin diet labeled with 5μCi 3H-niacin.Feces were collectd 5~7 days after injecton.The results showed that for three-week-old chicks,the contents of 3H-niacin in liver and blood dropping to 1/2 of peak value took 19 and 21 hours,and dropping to 1/5 of peak value took 78 and 169 hours,respectively.The supplementation of niacin at the level of 15~ 60mg/kg diet had no significant effect on niacin availability.The distribution of niacin in chick body was uniform.No true storage organ was found.