摘要
Abstract
An experiment was conducted to evaluate the effects of ordinary vitamin A (VA) and nanoVA on growth performance,immunity index,calcium,phosphorus and ash content and VA concentrations in liver,kidney and serum of broilers from 1 to 21 days of age and to research the relative bio-value of nano VA.By using a single factor completely randomized design,300 one-day old AA broilers were randomly divided into 10 groups with 5 replicates in each group and 6 broilers in each replicate.Ordinary VA and nano VA were used to provide 750,1 500,2 250,3 000,3 750 IU/kg activity in a nutritionally completed corn-soybean meal diet.The experiment phase was 1～21 d.The results are as follows:feed conversion (FCR),spleen index,liver vitamin A content,renal vitamin A content and serum vitamin A content were all significantly affected by ordinary vitamin A and nano vitamin A(P＜0.05).However,no significant differences on the average daily gain,average weight and average daily feed intake (P＞0.05) were observed.By comparing the relative biological value of the two with non-linear model,the relative biological value of nano vitamin A was acquired,namely,feed conversion 0.9574,average weight 1.8155,average daily gain 1.8577,liver vitamin A content 0.6786,kidney vitamin A content 0.7793,serum vitamin A content 0.6904,spleen index1.2432,fabricius index 0.8538,and calcium percentage 3.1327.The results showed that in ferms of economic benefits,nano vitamin A is comparatively better in biological values than the ordinary vitamin A.Taking average body weight and daily gain as the assessment indicators,the relative biological value of the productive performance of nano vitamin A is 1.8155 and 1.8577.关键词
纳米/维生素A/肉鸡/生产性能/相对生物学效价Key words
nano/vitamin A/broiler/performance/relative biological value分类
农业科技
