CAJ | 학술논문

As a result of agriculture practices, mil ion tons of agriculture are produced as a secondary or by-products;however, with low nutritive values. Many methods are applied to improve the nutritive value and increase its utilization in ruminant’s nutrition. The biological treatments are the most common with more safe-treated products. In most cases, the biological treatments are paral eled with decreased crude ifber and ifber fractions content with increased crude protein content. Direct-fed micro-bial and exogenous enzymes to animal are other ways of biological methods for improving nutritive value of feeds. Here in this review, we wil try to cover the biological treatments of by-products from different sides view with different types of animals and different animal end-products.