The effects of fermented cotton stalks on the growth performance,rumen fermentation parameters,and economic benefits of Tan sheep
The aim of this study is to investigate the effects of fermented cotton stalks on the growth performance,rumen fermentation parameters,and economic benefits of Tan sheep.120 Tan sheep with a weight of(23.72±0.67 kg)were randomly divided into 4 groups,Each group consists of 5 repetitions,with 6 repetitions per group.Four groups of Tan sheep were fed with experimental feed supplemented with 0%,5%,10%,and 15% fermented cotton stalks instead of whole plant corn silage on the basis of basic feed.The experiment lasted for 100 days,with 5 days of pre feeding and 95 days of regular feeding.The results showed that compared with the control group,the FBW of Tan sheep fed with 10% and 15% fermented cotton stalks significantly decreased by 4.57% and 5.99%,respectively(P＜0.05);The addition of 10% and 15% fermented cotton stalks to the diet significantly reduced the ADG of Tan sheep by 10.46% and 13.25% (P＜0.05),respectively;The addition of 10% and 15% fermented cotton stalks to the diet significantly increased the F/G of Tan sheep by 11.29% and 15.29%,respectively(P＜0.05);In addition,gradient fermentation of cotton stalks instead of silage corn had no significant effect on the ADMI of Tan sheep(P＜0.05).The NH3-N content in the rumen of Tan sheep fed with 10% and 15% fermented cotton stalks significantly decreased compared to the control group(P＜0.05),the AA and TVFA content in the rumen of Tan sheep fed with 10% fermented cotton stalks significantly decreased compared to the control group(P＜0.05),and the PA content in the rumen of Tan sheep fed with 10% and 15% fermented cotton stalks significantly decreased compared to the control group(P＜0.05);In addition,fermented cotton stalks had no significant effect on the rumen BA,VA,IBA,IVA content,and the proportion of volatile fatty acids in Tan sheep(P＞0.05).After using fermented cotton stalks gradient to replace whole plant corn silage,the feed cost was reduced by 0.07,0.14,and 0.21 yuan,respectively.On the premise of consistent market prices,the economic income from aquaculture is 231.45,217.21,198.14 and 192.16 yuan,respectively.In summary,excessive use of fermented cotton stalks instead of whole plant corn silage has a certain negative impact on the rumen fermentation and growth of Tan sheep.Despite a significant reduction in feed costs,the economic benefits of the whole plant silage corn group are still the highest.
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