Effect of various silage additives applied in corn, alfalfa and whole barley on in vitro duodenum utilizable crude protein in dairy cows

摘要

Silages have become the necessary forage component in the ration of dairy cows over the last few decades (Khan et al., 2015). Silages are often a wise choice when selecting forages for providing fiber and energy needed to optimize rumen function (Kolver et al., 2001). Although protein concentration in silages is much lower than concentrates, dry matter intake of silages is high and therefore protein entering into the digestive tract is considerable. Hence, the importance of inclusion of additives insilages to prevent protein proteolysis is indisputable. Protein utilization in silages is poor and is related to proteolytic activity by crop enzymes and further microbial breakdown of protein during ensilage. Thus, we tested urea (nutrient additive forenrich crude protein) , Biomin inoculants (fermentation stimulant) and formic acid (fermentation inhibitor) on in vitro duodenum utilizable crude protein in dairy cows and its effectiveness.