混合酸处理全株玉米青贮品质及其对绵羊生长性能的影响

Whole-plant Corn Silage Quality Treated with Mixed Acids and its Effect on Sheep Growth Performance

试验旨在研究添加不同浓度混合酸对全株玉米青贮品质的影响,以及饲喂后对杜寒杂交(杜泊羊×小尾寒羊)F1代绵羊生长性能的影响。试验混合酸比例组成为甲酸45%、丙酸45%、丙酸钠10%,以蜡熟期全株玉米为青贮原料,分为4组,混合酸添加浓度分别为0(对照组)、0.3%、0.6%、1%。结果表明,与对照组相比,各试验组均显著降低了青贮中乙酸/丙酸的比值(P<0.05),且0.3%及0.6%组对全株玉米青贮品质改善效果较好。CNCPS结果显示,0.6%组显著提高了青贮中的慢速降解蛋白(PB3)组分(P<0.05),同时降低了不可利用纤维(CC)组分(P>0.05),改善了青贮品质。与对照组相比,各试验组均有效地抑制了霉菌酵母菌的繁殖,改善了青贮的有氧稳定性。饲养试验结果发现,试验组绵羊平均日增重及料重比均优于对照组,其中0.6%及1%组绵羊的料重比显著优于对照组(P<0.05)。综上所述,混合酸处理能改善全株玉米青贮品质;0.6%浓度混合酸处理青贮饲喂绵羊后可显著提高杜寒杂交F1代绵羊的生长性能。

In order to explore different concentrations of mixed acids in improving quality of whole-plant corn silage and their effects on growth performance of Dorper×Han F1 sheep.4levels of 45%formic acid,45% propionic acid and 10% sodium propionate were mixed,and 0（control）,0.3%,0.6% and 1% were added to 4groups of ripening period whole-plant corn.The results showed that compared with control group,the experimental groups could significantly decrease the proportion of AA/PA in silage（P〈0.05）;0.3% and 0.6% groups had the better effects.Based on the result of CNCPS,0.6% group significantly improved the PB3 component（P〈0.05）,reduced the CC component（P〉0.05）,and improved the quality of silage.Compared with control group,the experimental groups effectively inhibited the mold and yeast reproduction,improved the aerobic stability of silage.The feeding trial results showed that ADG and F/G of sheep in experimental groups were better than control group,and F/G of both 0.6% and 1%groups were significantly better than that in control group（P〈0.05）.In conclusion,treatment of mixed acids could improve the quality of whole-plant corn silage,and silage treated with 0.6%levels of mixedacids could significantly improve the growth performance of Dorper×Han F1 sheep.