Effects Of Chestnut Tannin On Rumen Fermentation,Production Performance And Meat Quality Of Fattening Tan Sheep

The purpose of this experiment was to study the effects of chestnut tannin on rumen fermentation,blood biochemical indexes,antioxidant capacity,immune performance,meat quality,slaughter performance,muscle fatty acid composition,digestion and metabolism and production performance of fattening Tan sheep,so as to provide a theoretical basis for the rational utilization of chestnut tannin.Twenty-seven 3 month old male Tan sheep lambs with similar body weight and good health were selected and randomly divided into 3 groups with 9 sheep in each group,and every 3 sheep was a repeat.Each group was fed the basal diet with a concentrate-roughage ratio of 55:45 and added with 0 mg/kg DM(control group),2000 mg/kg DM(trial group Ⅰ),and 4000 mg/kg DM(trial group Ⅱ)of chestnut tannins.The pretrial period was 10 days,and the trial period was 60 days.Results:Ⅰ)On the 60th day of the experiment,the content of globulin(GLB)in trial group Ⅰ and trial group Ⅱ was significantly higher than that in the control group(P<0.05),and the content of total protein(TP)increased with the increase of chestnut tannin content(P>0.05).The content of GSH-Px in group Ⅱ was extremely significantly higher than that in control group and group Ⅰ(P<0.01),and the content of total superoxide dismutase(T-SOD)in group Ⅰ and group Ⅱ was extremely significantly higher than that in control group(P<0.01),there was no significant difference in malondialdehyde(MDA)content among the groups(P>0.05),but with the increase of chestnut tannin addition,MDA showed a downward trend.On the 60th day,the content of IgA in test group Ⅱ was significantly higher than that in the control group(P<0.05),and the contents of IgM and IgG were slightly higher than that in the control group(P>0.05).2)The contents of acetic acid and total volatile fatty acids in the rumen fluid of sheep in trial groupⅠ and trial group Ⅱ were significantly increased(P<0.01),butyric acid content was significantly increased(P<0.05),ammonia nitrogen,pH,propionic acid,isobutyric acid,isovaleric acid,valeric acid content and acetic acid/propionic acid had no significant effect(P>0.05).The nitrogen intake significantly increased with the increase of tannin content(P<0.01).The nitrogen deposition in trial group Ⅰ and trial group Ⅱ was significantly higher than that in the control group(P<0.01),and the nitrogen deposition rate and DM apparent digestibility were significantly higher than those in the control group(P<0.05).The total ingestible energy,digestible energy and total energy digestibility of each group increased with the increase of tannin content.Under the condition of similar initial body weight,the total weight gain and average daily weight gain of Tan sheep in trial group Ⅱ were significantly higher than those in the control group(P<0.05),and the dry matter intake increased significantly with the increase of tannin addition(P<0.01),the feed-to-weight ratio showed a downward trend(P>0.05),and the addition of tannins had no significant effect on the body size of Tan sheep in each group(P>0.05).3)The live weight,carcass weight,net meat weight and eye muscle area before slaughter in trial group Ⅰ and trial group Ⅱ were significantly higher than those in the control group(P<0.05),muscle moisture,crude protein,crude fat and crude ash were not found in each group Significant difference(P>0.05),the content of α-linolenic acid in muscle fatty acid increased significantly with the addition of chestnut tannin(P<0.01),and the content of eicosapentaenoic acid in trial group Ⅰ and trial group II was significantly higher than that in the control group Although there was no significant difference in the content of polyunsaturated fatty acids(PUFA)among the groups(P<0.05),it showed an increasing trend with the increase of Chestnut tannin addition(P>0.05),and the content of other fatty acids had no significant effect(P>0.05).To sum up,adding an appropriate amount of chestnut tannin can improve the production performance and slaughter performance of fattening Tan sheep,and improve the immunity and antioxidant capacity of Tan sheep.Under the experimental conditions,adding 4000 mg/kg DM chestnut tannin trial group Ⅱ had the best effect.