马铃薯渣和秸秆混合青贮对奶牛生产性能的影响
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摘要
本试验将马铃薯渣和秸秆混合青贮并测定其常规营养成分,将24头年龄、胎次、产奶量、泌乳天数基本一致的奶牛随机分成4组,其中三个试验组分别用25%、50%、100%的混合青贮料代替全株青贮玉米饲喂奶牛,对照组饲喂全株青贮玉米,测定其产奶量、乳成分,在饲养试验最后10天进行消化试验,从而为马铃薯渣饲料化利用提供依据。试验结果表明:
     混合青贮料的干物质、粗脂肪和粗纤维含量比全株青贮玉米分别低2.64%、1.92%和4.14%,而粗蛋白和磷含量比全株青贮玉米高6.6%和7.6%,钙含量相同。
     在整个试验期内,各处理组总产奶量差异不显著(P>0.05),日均产奶量试验一组和试验二组比对照组产奶量略有上升,而试验三组略有下降。
     试验二组和试验三组与对照组乳脂率差异显著(P<0.05),分别比对照组提高3.8%和5.8%,其余各组差异不显著(P>0.05),试验二组与试验一组乳蛋白差异显著(P<0.05),其余各组差异不显著(P>0.05),试验三组与对照组乳糖差异显著(P<0.05),比对照组提高0.89%,其余各组差异不显著(P>0.05),试验二组与试验三组的乳密度和非脂固形物差异显著(P<0.05),其余各组差异不显著(P>0.05)。
     试验三组DM消化率显著高于对照组(P<0.05),比对照组提高了2.24%,其余各组差异不显著(P>0.05),三个试验组CP消化率极显著的高于对照组(P<0.01),分别提高4.45%、2.94%和4.71%,试验三组显著高于试验二组(P<0.05),其余各组差异不显著(P>0.05)。三个试验组ADF消化率极显著高于对照组(P<0.01),分别提高8.32%、11.29%和9.16%,其余各组差异不显著(P>0.05)。试验三组NDF消化率极显著的高于对照组和试验一组(P<0.01),试验三组NDF消化率显著高于试验二组(P<0.05),试验二组NDF消化率显著高于试验一组(P<0.05)。
This experiment ensiled the mixture of potato residues and straw stalk and determined its conventional nutrition ingredient, 24 cows of same age , parity, milk yield and Lactation days were randomly divided into 4 groups, Three of the test group were fed with 25%, 50%, 100% instead of mixed silage , the control group fed with whole-plant corn silage, Determined the milk yield and composition, digestion trial was carried in the last 10 days of Feeding trial , Finally, evaluated the effect of feeding cow with potato residues to provide the basis of use of Potato starch in feeding.
     The results show that: content of dry matter, crude fat and crude fiber of the mixed silage were 2.64%, 1.92% and 4.14% respectively lower than whole-plant corn silage, but content of Crude protein and phosphorus were 6.6% high 7.6% higher than the whole-plant corn silage, content of calcium is the same.
     Throughout the trial period, total milk production was not significant (P>0.05) ,Test-day milk production of groups one and two were a litter higher than the control group, and groups three declined slightly.
     Milk fat percentage of group two and three was significant difference with control group (P <0.05), raised 3.8% and 5.8% higher compared with the control group, The other groups had no significant difference (P> 0.05). milk protein between group two and group one were significant difference (P <0.05) ,The other groups had no significant difference (P> 0.05). Lactose of group three was 0.89% significant higher than the control group, The other groups had no significant difference (P> 0.05). Density and non-fat solids of group three was significantly different with group two(P <0.05).
     The rate of digestibility of DM of group three was significant difference with control group (P<0.05),raised 2.24%,the other groups had no significant difference (P>0.05). The rate digestibility of CP of the three test groups was very significant higher than the control group(P<0.01), raised 4.45%、2.94% and 4.71% respectively, group three significant than group two (P<0.05) , The other groups had no significant difference (P> 0.05). The rate of digestibility of ADF of the three test groups was very significant higher than the control group (P<0.01) , raised 8.32%、 11.29% and 9.16% respectively , The other groups had no significant difference (P> 0.05). The rate of digestibility of NDF of group three was very significant higher than the control group and group one (P<0.01 ),was significant higher than group two(P<0.05), group two significant than group one (P<0.05).
引文
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