全株玉米青贮在母羊日粮中的应用

Using Corn Silage in Sheep Diet Formulations

全株玉米青贮在绵羊日粮中的应用

Written collaboratively by Jeff Held and Amanda Peterson

由杰夫.赫德与阿曼达.彼得逊合作Many Midwest producers have limited options for their primary forage source this year and, must utilize ear-less corn stalks as silage for their in livestock feeding systems. Despite the lack of ears on stalks in some areas the resultant corn stover silage is still expected to contain 80% of expected level of energy under normal growing conditions.

今年，中西部的生产者在基础粗饲料的选择上捉襟见肘，他们必须利用抽穗很少的玉米茎秆做成青贮，作为家畜的当家饲料。尽管在某些地区玉米茎秆上缺少果穗，但这种青贮残留的营养物质，与通常的全株玉米青贮相比，预计依然能保留80%的能量水平。

Corn silage is a fermented feedstuff providing great flexibility in ewe diet formulations during gestation and lactation. It is generally considered a very economical forage source for ruminant diets. Corn silage has been used in sheep diet formulations for many decades with great success. It is best suited to contribute energy (TDN or Calories) to a diet for a ewe. Large flocks, 200 head or more, often use corn silage in TMR rations fed in fence line feeding systems. In these feeding systems the corn silage is targeted to contribute 50% of the forage (as-fed basis) and blended with other types of forage, supplemental energy or protein feed sources to meet recommended animal nutrient needs. Sheep research studies have demonstrated that corn silage can contribute 100% of the dietary forage in a ewe’s diet.

全株玉米青贮是一种发酵的饲料原料，可以在奶牛妊娠期和哺乳期的日粮中灵活使用。一般认为，对于反刍动物而言，它是一种非常经济的饲料原料。在绵羊的日粮配方中，全株玉米青贮已经使用了几十年了，并且获得了极大的成功。它特别适合在母羊日粮中提供能量（TDN 或卡路里）。大群，200只羊甚至更多，常常把全株玉米青贮用在TMR日粮中，使用围栏饲喂系统饲喂。在这种饲喂方法中，全株玉米青贮的目标是提供50%的粗饲料（饲喂状态），再混合其他粗饲料、能量和蛋白补充饲料，以满足动物的建议营养需求。近期，绵羊生产研究表明，全株玉米青贮可以代替母羊日粮中100%的粗饲料。

DM1CP2ADF NDF TDN NeM

(Mcal/kg)NeL

(Mcal/kg)

NeG

(Mcal/kg)

Ca P Mg

35% 8.4% 25% 47% 70% 1.53 1.51 .95 .2% .22% .19

1Dry Matter 2Crude Protien

Source:OMFRA Sheep Fact Sheet

When compared to high quality forages, such as alfalfa, corn silage is found to have lower levels of protein, minerals, and vitamins. Due to the limitations in the overall nutrient composition, corn silage is often blended with higher quality forages to meet nutritional requirements. Using corn silage as the entire source of forage or as a blend expects high palatability and to serve as the foundation of ewe diets formulated to achieve targeted levels of animal performance. Generally in sheep diets with high levels of corn silage supplemental sources of protein are needed, SBM or DDGS are the typical protein sources used to compliment corn silage based diets. Other imbalances found with corn silage based rations include level of minerals especially calcium, it is most practical to offer a commercial sheep mineral salt ad lib to compliment the diet formulation.