The effects of different roughage on growth performance,nutrient apparent digestibility,and intestinal tissue morphology of meat sheep
This experiment aims to investigate the effects of different roughage on the growth performance,nutrient apparent digestibility,and intestinal tissue morphology of meat sheep.96 healthy Du Han hybrid sheep with similar weight and age(33.48±0.62 kg)were selected and randomly divided into 4 groups,with 3 replicates in each group and 8 sheep in each replicate.Meat sheep were fed with equal nitrogen feed,and the composition of alfalfa hay,silage corn,and oat hay in each group's roughage was 5∶0∶0(alfalfa hay group),4∶1∶0(silage corn replacement group),4∶0∶1(oat hay replacement group),and 3∶1∶1(mixed replacement group),respectively.The pre trial period is 10 days,and the main trial period is 60 days.The results showed that:(1)The average daily weight gain of meat sheep in the alfalfa hay group and mixed substitution group was significantly higher than that in the silage corn substitution group and oat hay substitution group(P＜0.05),and the feed to weight ratio was significantly lower than that in the silage corn substitution group and oat hay substitution group(P＜0.05).(2)The apparent digestibility of dry matter and crude fat in the alfalfa hay group and mixed substitution group was significantly higher than that in the silage corn substitution group and oat hay substitution group(P＜0.05).(3)Compared with the silage corn replacement group and oat hay replacement group,the alfalfa hay group and mixed replacement group significantly increased the jejunal villus height and villus to crypt ratio(P＜0.05).Compared with the silage corn replacement group and oat hay replacement group,the alfalfa hay group and mixed replacement group significantly reduced the depth of ileal crypt(P＜0.05),and the velvet to crypt ratio significantly increased(P＜0.05).Conclusion:When the composition of alfalfa hay,silage corn,and oat hay in roughage is 3∶1∶1,it can improve the growth performance of meat sheep and has no negative effects on the apparent digestibility of nutrients and intestinal tissue morphology.Therefore,the mixed roughage of silage corn and oat hay has a good substitution effect on alfalfa hay.
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