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In China's northern grassland, winter and spring sheep grazing in the hay on the ground as long as seven to eight months Fanjin Fu, etc. [1] The results show that winter hay of grass cp content than the grass of a significant decline, ndf were significantly increased dry matter digestibility was reduced by approximately 50%. This is due to the livestock feed a large number of fiber content, low content of soluble nutrients as well as energy and nitrogen inappropriate pasture can not provide the rumen microbes to provide sufficient nutrients 更多：https://www.bmcx.com/ , and affect their growth and reproduction of its enzyme activity, result in forage digestibility reduce the final grazing livestock intake of nutritional deficiencies. The large number of experiments show thatSheep in the winter and spring hay season lick molasses urea lick blocks can improve the digestibility of poor quality roughage and sheep daily gain [2,3]. This situation, this study were sheep grazing on the grass in winter and spring lick molasses, urea Tim Brick on ruminal fermentation performance and rumen microbial seeks to clarify the mechanism of molasses urea lick blocks affect forage digestibility.

In the steppe region of northern China, sheep in winter and spring during the 7-8 months of Bacillus subtilis on pasture, Fan Jinfu "1" test results showed that the winter subtilis, forage CP content than the marked decline in the green grass, a significant increase in NDF content, dry matter digestibility is reduced in 50%. This is because the livestock because feed intake plenty of high fiber content, soluble nutrient content is low, as well as providing rumen microbial nitrogen inappropriate pastures are not providing sufficient nutrients 更多：https://www.bmcx.com/ , affecting its growth and propagation and enzyme activity, resulting in lower digestibility of the forage, grazing livestock intake undernutrition eventually. A large number of experiments showed thatSheep in the winter and spring seasons subtilis licking urea lick brick with molasses can improve poor-quality forage digestibility and sheep increasing weight "2, 3". In response to this situation, this experimental study on sheep grazing on the grass in winter and spring, licking sugar honey, add urea brick on rumen fermentation and effects of rumen microorganism, seeks to clarify the effect mechanism of forage digestibility of molasses-urea lick brick.

In China's northern grassland area, and sheep in a season 7 to 8 months of bacillus subtilis grazing the earth breeding, such as FanJinFu 【 1 】 of test results show that winter hay period and the grass CP content than the green grass period down significantly, NDF content increased significantly, dry the digestion rate by about 50%.This is because the livestock feed themselves because of high content of soluble fiber, low in nutrients and can not suitable than the nitrogen grass cannot provide ruminal microbes provide sufficient nutrients, and influence the growth and reproduction of the enzyme activity, leading to the digestibility of forage grass cut 更多：https://www.bmcx.com/ , the final grazing animals intake nutritional deficiencies.A large number of experiments show that, the sheep in the winter season bacillus subtilis, suckle molasses urea TianZhuan can increase the digestibility of inferior CuSiLiao and sheep daily gain 【 2, 3]. In this kind of situation, this test in the winter season on the grass grazing sheep suckle molasses,Urea to add brick rumen fermentation properties and the effect of rumen microbes, intends to TianZhuan effect urea molasses forage the digestion rate mechanism.

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