饲粮添加不同水平苜蓿粗多糖对蛋鸡生产性能和蛋品质的影响

本试验旨在研究饲粮添加不同水平苜蓿粗多糖对蛋鸡生产性能和蛋品质的影响。选取540只27周龄的海兰褐壳蛋鸡,随机分为6组,每组6个重复,每个重复15只鸡。对照组饲喂基础饲粮,试验组分别饲喂在基础饲粮中添加250、500、1 000、2 000和4 000 mg/kg苜蓿粗多糖的试验饲粮。试验期24周。结果表明:与对照组相比,1)试验1~8周,500、2 000和4 000 mg/kg苜蓿粗多糖添加组产蛋率均显著提高(P0.05);试验9~16周、17~24周和1~24周,250、500、1 000和2 000 mg/kg苜蓿粗多糖添加组产蛋率显著提高(P0.05),料蛋比显著降低(P0.05),且在试验17~24周和1~24周,总产蛋重量显著提高(P0.05),而平均蛋重和采食量无显著差异(P0.05);2)250、500和1 000 mg/kg苜蓿粗多糖添加组在试验第6、8、12、16、20和24周蛋壳颜色显著加深(P0.05),且在试验第8、12、16周较4 000 mg/kg苜蓿粗多糖添加组蛋壳颜色亦显著加深(P0.05);3)2 000 mg/kg苜蓿粗多糖添加组在试验第6、20、24周蛋壳强度显著提高(P0.05);4)试验第8、12、16、20和24周,250、500、1 000和2 000mg/kg苜蓿粗多糖添加组蛋壳厚度显著增加(P0.05),且4 000 mg/kg苜蓿粗多糖添加组在试验第8、20、24周蛋壳厚度亦显著增加(P0.05);5)2 000 mg/kg苜蓿粗多糖添加组在试验第10、12和24周蛋白高度和哈夫单位显著提高(P0.05),且2 000 mg/kg苜蓿粗多糖添加组在试验第10和12周蛋白高度和哈夫单位显著高于250、1 000和4 000 mg/kg苜蓿粗多糖添加组(P0.05)。试验表明,产蛋期蛋鸡饲粮中添加适宜水平的苜蓿粗多糖可以显著提高蛋鸡生产性能,改善蛋品质,且推荐适宜添加水平为250 mg/kg。

Effects of Different Dietary Supplementation Levels with Crude Polysaccharides Isolated from Alfalfa on Performance and Egg Quality of Laying Hens

This experiment was conducted to study the effects of crude polysaccharides isolated from alfalfa ( ACPS) at different supplementation levels on production performance and egg quality of laying hens. Five hundred and forty aged of 27 weeks Hy?Line Brown hens were randomly allocated to 6 groups with 6 replicates per group and 15 hens per replicate. Hens in the control group were fed a basal diet, and the others in experi?mental groups were fed basal diets supplemented with 250, 500, 1 000, 2 000 and 4 000 mg/kg ACPS, re?spectively. The experiment lasted for 24 weeks. The results showed as follows: compared with the control group, 1) dietary supplementation with ACPS at 500, 2 000 and 4 000 mg/kg significantly increased egg pro?duction of hens during 1 to 8 weeks ( P<0. 05 ) . The groups added with ACPS at 250, 500, 1 000 and 2 000 mg/kg significantly increased egg production and decreased ratio of feed to egg during 9 to 16, 17 to 24 and 1 to 24 weeks (P<0.05), meanwhile significantly enhanced egg total mass during 17 to 24 and 1 to 24 weeks (P<0.05). However there were no obvious effects on the average egg weight and feed intake (P>0.05) . 2) Diets supplemented with 250, 500 and 1 000 mg/kg ACPS significantly improved eggshell color at 6th, 8th, 12th, 16th, 20th and 24th week (P<0.05), while significantly improved eggshell color at 8th, 12th and 16th week compared with 4 000 mg/kg ACPS dietary supplementation ( P<0. 05 ) . 3 ) Diets added with 2 000 mg/kg ACPS significantly increased eggshell strength at 6th, 20th and 24th week (P<0.05). 4) Diets supplemented with 250, 500, 1 000 and 2 000 mg/kg ACPS significantly improved eggshell thickness at 8th, 12th, 16th, 20th and 24th week (P<0.05), as well as 4 000 mg/kg ACPS supplementation group also signifi?cantly increased eggshell thickness at 8th, 20th and 24th week (P<0.05). 5) The group added with ACPS at 2 000 mg/kg significantly increased the albumen height and Haugh unit at 10th, 12th and 24th week (P<0.05), meanwhile significantly increased albumen height and Haugh unit at 10th and 12th week compared with 250, 1 000 and 4 000 mg/kg ACPS supplementation groups ( P<0.05) . These results suggest that the suitable sup?plemental level of ACPS can significantly enhance production performance and improve egg quality of laying hens. It is recommended that dietary supplementation with ACPS is 250 mg/kg.