裂殖壶菌粉对蛋鸡生产性能、蛋品质、血清生化指标和蛋黄二十二碳六烯酸含量的影响

摘要

This experiment was conducted to investigate the effects of diet supplemented with different levels of Schizochytrium ( SL) powder on performance, egg quality, serum biochemical indices and yolk ducosahexeno-ic acid ( DHA ) content of laying hens. Two hundred and eighty eight Hy-Line brown laying hens aged 29 weeks were randomly divided into 4 groups with 6 replicates per group and 12 hens per replicate. Hens in the four groups were fed the basal diets supplemented with 0 ( control) , 1%, 2% and 3% SL powder, respective-ly . The experiment lasted for 6 weeks. The results showed as follows:1 ) dietary SL powder supplemental lev-el had no significant effects on laying rate, average egg weight and the ratio of feed to egg (P>0. 05). 2) Dietary SL powder supplemental level had no significant effects on egg-shape index, eggshell thickness, egg-shell strength, Haugh unit and albumen height (P>0. 05), the yolk color in 1% SL powder group was signif-icantly higher than that in other groups ( P<0 . 05 ) . 3 ) The contents of total cholesterol, triglyeride and low density lipoprotein-cholesterol in serum in 1% and 2% SL powder groups were significantly lower than those in control group ( P<0 . 05 ) . 4 ) The contents ofω-3 polyunsaturated fatty acid and DHA in egg yolk were linear improved with the dietary SL powder supplemental level increasing, and reduced the ratio ofω-6 toω-3. How-ever, the yolk DHA content did not continue to increase when SL powder supplemental level exceed 2%, and DHA enrichment in eggs could be saturated in 15 days. The results suggest that under this experimental condi-tion, dietary supplementation of 2% SL powder can improve the yolk DHA content of hens, and have no nega-tive effect on performance and egg quality.%本试验旨在研究饲粮添加不同水平裂殖壶菌( SL )粉对蛋鸡生产性能、蛋品质、血清生化指标和蛋黄二十二碳六烯酸( DHA)含量的影响。选用288只29周龄海兰褐商品蛋鸡,随机分为4个组,每组6个重复,每个重复12只。各组分别饲喂基础饲粮中添加0(对照)、1%、2%和3%SL粉的试验饲粮,试验期6周。结果表明：1)饲粮SL粉添加水平对蛋鸡产蛋率、平均蛋重和料蛋比影响不显著(P>0.05)。2)饲粮SL粉添加水平对鸡蛋蛋形指数、蛋壳厚度、蛋壳强度、哈氏单位、蛋白高度影响不显著(P >0.05),1%SL 粉组蛋黄颜色显著高于其他组(P <0.05)。3)1%、2% SL 粉组血清总胆固醇( TC)、甘油三酯( TG)和低密度脂蛋白胆固醇(LDL-C)含量显著低于对照组(P<0.05)。4)饲粮SL粉添加水平线性增加了鸡蛋中ω-3多不饱和脂肪酸和DHA含量,降低了ω-6/ω-3,但SL粉添加水平超过2%时,蛋黄中DHA含量不会继续增加,DHA在鸡蛋中的富集15 d即可饱和。结果提示,本试验条件下在蛋鸡饲粮中添加2%SL粉可提高蛋黄DHA含量,并且对蛋鸡生产性能和蛋品质无不良影响。