Effects of Diets with Different Cotton Stalk Levels of Total Mixed Ration on Growth Performance and Rumen Fermentation Parameters in Sheep
[Objective]This experiment aims to conduct investigation of the effects of different cotton stalk of TMR on growth performance and rumen fermentation parameters in sheep, and to determine dietary optimal cotton stalk level of sheep.[Method]Forty-four rams with similar body weight were randomly assigned to four groups with eleven sheep in each by a single factor completely randomized block design which were fed rations with different cotton stalk levels: 0,10％, 20％ ,and 30％, respectively.[Result]The results showed as follows : 1) The effects of diets with different cotton stalk on BW, ADG and Feed to gain ratio (F/G) were not significant difference(P ＞0.05);2) Effect of cotton stalk (levels of 10％ to 20％) on rumen pH were not significant difference (P ＞ 0.05), but rumen pH was significantly increased (P ＜ 0.05) while dietary cotton stalk level was 30％.3) There were no significant difference of rumen NH3-N in groups, and different dietary cotton stalk levels had no obvious effect on rumen acetate, isobutyrate, isovalerate, and TVFA.[Conclusion]In conclusion, under the experimental condition, no significant effect on DMI and ADG and improving rumen fermentation parameters was determined while feeding with cotton stalk by 10, 20 and 30 percent of ration which could replace the corn stalk rationed by 33, 60 and 90 percent.
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