Study On The Fattening Effect Of The Combination Of "Zhang Zagu" Millet Straw With Peanut Straw Or Corn Straw On Lamb

Millet straw is rich in forage resources in semi-arid areas of northern China.The development and utilization of“Zhang Zagu”millet straw in sheep production can increase the diversity of diet forage and alleviate the dependence of sheep production on peanut straw,corn straw and other conventional forage grass.The application of millet straw is conducive to opening up the crude feed resources and reducing the waste of millet straw.Therefore,this paper studied the lambs fattening experiment of“Zhan Zagu”millet straw with peanut straw and corn straw combination,and the whole millet silage,and discussed the application effect of millet straw and whole millet silage in lamb fattening.The results were as follows:the crude protein（CP）and Ether extract（EE）of millet straw were higher than that of corn straw,the calcium（Ca）content was higher than that of corn straw and whole corn silage,and the Neutral detergent fiber（NDF）of millet straw was the highest,in which acid detergent fiber（ADF）was lower than that of peanut straw.Experiment 1:54 four-months-old healthy Hanper×Small-Tailed crossbred F1rams were randomly divided into 2 groups:high proportion of millet straw group（HMS group）millet straw granules:peanut straw=2:1 and low proportion of millet straw group（LMS group）millet straw granules:peanut straw=1:2,There were 3replicates in each group and 9 repeats in each group.The experimental period was 3months and the pre-feeding period of 7 days.The experiment of fattening lambs was carried out with different proportion of millet straw and peanut straw combination diet.The results indicated:The total gain and daily gain of HMS group were significantly higher than those of LMS group（P<0.05）;at the end of fattening,HMS group exhibited higher the glucose（GLU）content than LMS group（P<0.05）;the activity of chymotrypsin（CRS）in Jejunum and duodenum of HMS group were significantly higher than those of LMS group（P<0.05）,the activity of trypsin（TRS）in duodenum of HMS group was more than that of LMS group（P<0.05）;the pre-slaughter weight,carcass weight,slaughter rate,eye muscle area,GR value,pH₂₄,shear force,water loss rate,cooked meat rate,meat color and marbling grading in HMS group were no significant differences than those of LMS group（P>0.05）;the net profits in HMS group were distinctly higher than those of LMS group（192.83 RMB VS 128.37RMB）.Experiment 2:60 three-months-old healthy Small-Tailed crossbred rams were randomly divide into 4 groups with 3 replicates in each group and 5 lambs in each replicate.The proportion of millet straw replacing corn straw was 0%（groupⅠ）,50%（groupⅡ）,70%（groupⅢ）and 100%（groupⅣ）.There were 3 replicates in each group and 5 repeats in each group.The experimental period of 4 months and the pre-feeding period of 7 days.The experiment of fattening lambs was carried out with different proportion of millet straw and corn straw combination of total mixed diet pellets.The results indicated:The total weight gain and daily gain of groupⅡwere significantly higher than those of groupⅠand groupⅣ（P<0.05）;at the end of fattening,the serum aspartate transaminase（AST）content of groupⅡwas the lowest（P<0.05）;it shows that diet of groupⅡhad the least effect on liver;the serum lactate dehydrogenase（LDH）content of groupⅡwas the lowest（P<0.05）;it showed that diet of groupⅡhad the best ability to resist stress;there was no significant difference in pre-slaughter weight,carcass weight,slaughter rate,eye muscle area,GR value,pH_1,pH₂₄,shear force,water loss rate,cooked meat rate and marbling grading in the four groups（P>0.05）;the highest net profit of group II was 304.02 yuan.Experiment 3:42 three-months-old healthy Small-Tailed crossbred rams were randomly divided into 2 groups.The whole corn silage group was used as the control group.The experimental period of 75 days and the pre-feeding period of 7 days.The experiment of fattening lambs was carried out with whole millet silage.The results indicated:The total weight gain and daily gain of the whole corn silage group were higher than that of the whole corn silage group（15.15%and 15.21%,P<0.05）;the net profits in whole millet silage group was distinctly lower than that of whole corn silage group（116.22 RMB VS 168.68 RMB）.Conclusion:The ratio of millet straw to peanut straw was 2:1,and the maximum daily gain was248.10g/d.The ratio of millet straw to corn straw was 50:50,and the maximum daily gain was 219.99g/d.The maximum daily weight gain was 184.48g/d in the whole corn silage group.