Effect Of Dietary Vitamin A Supplement Levels On Growth Performance, Immunology, VA Tissue Retention And Serum Lipid Peroxidation Of Growing Meat Rabbit

The purpose of this trial was to study the effects of different dozes Vitamin A on the production performance, immunity indexes,serum and liver vitamin A concentration, Serum Lipid Peroxidation of weaner to 2 month old New Zealand growing meat rabbits. The was conducted to evaluate the effects of different dietary vitamin A supplement levels (3 000, 6 000, 12 000 and 24 0000 IU/㎏, respectively). Eighty weaned rabbits were allocated in individual cages for five treatments in which they were fed each diet above.Experiment one The dietary Vitamin A supplement levels had no significant influence on feed/gain (F/G) (P<0.05). When VA supplement level increased, the F/G was raised gradually and reached the lowest(3.37:1) when dietary VA supplement level was 6 000 IU/㎏. There were no significant difference of immunity indexes among different treatments (P>0.05). The liver VA concentration increased with the increase of dietary VA supplement levels (P<0.01).The dietary VA supplement could improve serum anti-oxidative activity. The appropriate of dietary VA supplement level of weaner to 2 month old growing meat rabbit was 6 000 IU/㎏.Experiment two Fifty 2 month-old rabbits were allocated in individual cages for five treatments in which they were fed each diet above. The dietary Vitamin A supplement levels had no significant effect on average daily gains (ADG),average daily intake (ADI)( P>0. 05) and had significant effect on feed/gain(F/G) (P<0.05). The ADG and F/G were the best when dietary VA supplement level was 6 000 IU/㎏. There were no significant difference of immunity indexes among different treatments (P>0.05). The liver VA concentration increased with the increase of dietary VA supplement levels. The dietary VA supplement could improve serum anti-oxidative activity. The appropriate of dietary VA supplement level of 2-3 month-old month growing meat rabbit was 12 000 IU/㎏.Experiment three The trial was conducted to evaluate the effects of different dietary vitamin A levels (1×104,2.39×105,5.64×105,7.93×105 IU/kg, respectively) on the production performance, immunity indexes,serum vitamin A concentration, serum biochemical indexes, mortality of weaning to 2 month old New Zealand growing meat rabbits. Eighty weaned rabbits were allocated in individual cages for four treatments in which they were fed each diet above. The results showed as follows: Vitamin A levels had no significantly influence serum vitamin A concentration (P>0.05) and the mortality increased (P<0.01).