| Jilin golden corn belt is one of the three golden corn belts in the world, whose corn yield ranks forefront in our country. The large corn yield also brings great straw resources. However, the "resource" cannot be used reasonably and becomes "pollution" to both atmosphere and environment due to traditional way of life. At the same time, although the straw plays a very important role feeding animals, It is a kind of typical fodder with low protein and high fiber. It also has poor palatability and contains the cellulose, especially lignin hard to digest and absorb by ruminants. The utilization of straw is not ideal, Therefore. the corn straw for feeding in Jilin province is not reasonable and causes a serious waste of resource.After scientific treatment, straw can be applied into rearing ruminants to increase feed intake, nutrient value and digestibility, which provides great help to increase the growth and remuneration of feeding ruminants using fattening sheep as the object, through the integrated comparison of the different sheep fattening performance and economic benefits after feeding the sheep with different proportion of puffed straw, this study aimed to identify the optimum proportion of puffing strain.which provides theoretical reference and technical basis1. Determination of puffed corn straw nutrient componentsAccording to nutrition experiment, puffed corn straw, normal corn straw and L.chinensis are divided as three groups. After nutritional components,rumen disappearance rate, volatile fatty acids, and cellulase activity were compared respectively, it indicated that dry matter, neutral detergent fiber, acid detergent fiber of puffed corn stover was significantly lower than normal maize straw and chinensis(P<0.05); no significant differences in crude protein and crude ash(P>0.05) appeared. Dry matter, neutral detergent fiber, acid detergent fiber of puffed corn stalk rumen disappearance rate was significantly higher than normal corn straw(P<0.05); however, no significant difference showed in comparison with L.chinensis(P>0.05). Volatile fatty acids, cellulase activity of puffed corn stover was significantly higher than normal maize straw(P<0.05); but no significant differences are detected in comparison with L.chinensis(P>0.05).2 Feeding experiment of fattening sheepIn order to compare growth performance and economic benefits and select the optimal forage ratio with high economic benefits and good feeding effect, we set up experiment cycle of 90 days, and divided 100 one-year-old healthy fattening sheep into 5 groups with 20 sheep in each group. With the comparison of the experiments, we concluded that the feeding value of puffed corn straw was higher than the one in normal corn straw; moreover, the production data of puffed corn straw were higher than normal corn straw. Meanwhile, when concentrated feed containing in puffed corn stalks was in 50% reduction to feed ruminants, similar breeding results can be obtained with feeding L.chinensis. Further, with comparing the feeding costs, we found that the required puffed corn stalks were less than L.chinensis, when the amount of concentrated feed was the same. The results showed that low investment and high return of puffed corn stalks are realized and the practical advantages of puffed corn stalks cannot be compared by normal corn straw and L.chinensis.In conclusion, corn straw with expanding treatment will destroy part of the lignin, improve the utilization of fiber material in fattening sheep, provide suitable environment for fattening sheep rumen microorganisms and enzymes, and perform its value better. Moreover, it can reduce the required amount of concentrated feed, decrease the feeding costs, and increase the economic benefits. |
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