高丹草与紫花苜蓿的混合青贮效果分析

Analysis to Mixed Silage Effect of Sorghum-sudangrass Hybrid and Alfalfa

以高丹草和紫花苜蓿为原料,按不同的质量比例(5∶5,6∶4,7∶3,8∶2)混合青贮,并在此基础上设置添加5%CaCO3和不添加5%CaCO3的试验处理,共8个处理,分别对应A,B,C,D,E,F,G,H表示;青贮30 d后,对发酵品质和营养成分进行了分析。试验结果:青贮30 d后,青贮饲料的酸度以C处理(7∶3)最低,pH值为4.43,且不同处理组之间差异极显著(P<0.01);B组(6∶4)酸性洗涤纤维含量最高,为40.02%,不同处理之间差异不显著(P>0.05);中性洗涤纤维含量以D处理(8∶2)含量最高,为44.64%,其次为C处理(7∶3),A处理(5∶5)含量最低,不同处理组之间差异极显著(P<0.01);粗蛋白含量以A处理(5∶5)最高达20.54%,显著高于其他各处理组(P<0.05);粗灰分、矿物质测定结果表明,G处理(7∶3+5%CaCO3)灰分、矿物质(钙、磷)含量最高,极显著地高于未添加CaCO3组(P<0.01);粗脂肪以G处理(7∶3+5%CaCO3)含量最高,且不同处理组之间差异不显著(P>0.05)。结果表明:高丹草与紫花苜蓿混合青贮的最适宜比例为C处理(7∶3),添加5%CaCO3后不仅对青贮品质无不良影响,而且显著提高了青贮饲料的营养价值、干物质、酸性洗涤纤维、中性洗涤纤维、粗灰分、矿物质。

Sorghumsudangrass hybrids and Alfalfa were ensiled to make mixed silage, according to different quality ratio （5： 5, 6： 4, 7： 3, 8： 2） , then compared by whether adding 5% CaCO3 or not during the mixed process, in all eight treatments and corresponding to A, B, C, D, E, F, G, H; the changes between fermentation quality and nutrition composition were observed after the 30days. The re suits showed that C treatment （7：3 ） group had minimum acidity, and each group was significantly dif ferent （ P 〈 0. 01 ）. B group （6 ： 4 ） had the highest content of acid detergent fiber, other treatment groups were not significantly （ P 〉 0. 05 ）. The content of neutral detergent fiber in D treatment （ 8： 2 ） group achieved at 44. 64% , followed by 7：3 treated group, A group （5： 5） was the lowest, there wasextremely significant difference between other treatment groups （ P 〈 0.01 ）. A treatment （5 ： 5 ） had the highest content of crude protein, which was significantly higher than other groups （P 〈 0. 05 ）. Re sults of crude ash and mineral showed that, the content of ash and mineral （calcium, phosphorus） in G treatment （7：3 ＋ 5% CaCO3 ） was the highest, which was extremely higher than other groups with out adding calcium carbonate. G treatment （7：3 ＋ 5% CaCO3 ） had the maximum content of crude fat and there was no significant difference between other treatment groups （P 〉 0. 05 ）. The results showed that the optimum ratio of mixed silage was C treatment （7：3 ）, and there was no adverse effects on si lage while adding 5% calcium carbonate, nutritional values, dry matter, acid detergent fiber, neutral detergent fiber, crude ash, mineral were significantly improved.