| The purpose of the trial was to investigate the suitable requirement of zinc and vitamin A, and interaction between zinc and vitamin A. 216 of REX rabbit with 50 days age were selected, and divided into 12 groups by applying 4 x3(zincx vitamin A) , which was composed with three duplications. REX rabbits were fed on basal dietary supplemented with 0,40,80,120mg/kg zinc and 0,5000, 10000IU/kg vitamin A for 45 days, respectively. Feed Intake, average daily gain(ADG), feed/gain (F/G), contents of total protein(TP) , albumin(ALB) and urea nitrogen(SUN) in serum, activities of alkaline phosphatase(ALP) and CuZn-superoxide dismutase (CuZn-SOD), zinc and vitamin A concentration in serum were acquired at interval of 15 days ; vitamin A concentration in liver, zinc concentration in hair, liver, kidney, pancreas, spleen, tibia, heart and leg muscle were acquired at 45 days. The results were as follows: In zinc treatments, Feed Intake was not different, but 40,80,120mg/kg zinc all improved ADG and decreased F/G, and 80mg/kg was better than others. At 45 days days, level of zinc in dietary had medium positive correlations with serum TP, serum ALB and CuZn-SOD in liver ,and a medium negative correlation with SUN, furthermore, 80,120mg/kg treatments were more obvious, but there was no difference between 80 an 120mg/kg treatment. Moreover, there were strong positive correlations between levels of zinc in dietary and zinc concentration in liver, kidney, pancreas, tibia and hair, but no correlations between it and zinc concentration in heart, spleen, leg muscle. Levels of vitamin A in dietary, which moderately correlated with ADG in 15 and 30 days of trial, had no significant effect on Feed Intake, F/G, contents of TP, ALB,SUN, and activities of ALP and CuZn-SOD, but the better performance was displayed in the treatment supplemented with 10000IU/kg vitamin A. There was a medium positive correlation between content of zinc in dietary and serum vitamin A concentration, and a strong positive correlation between it and vitamin A concentration in liver. Zinc in dietary might help to mobilize vitamin A in liver to blood, so there was a synergistic action between zinc and vitamin A about vitamin A concentration in serum. Zinc-vitamin A interaction had effects on zinc concentration in each tissue, and effect degree was discrepancy. Levels of vitamin A in dietary had medium positive correlations with zinc concentration in liver, kidney, pancreas, tibia and hair. Collecting above-mentioned results, it is suggested that suitable additive level of zinc and vitamin A in dietary were 80mg/kg and 10000IU/kg respectively in Vc- II growing REX rabbit. |
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