Effects Of Inorganic Sulfur On Rumen Fermentation And Fiber Degradation In White Cashmere Goat Of Northern Shaanxi

The study aimed to explore the appropriate adding amount of inorganic sulfur in non-cashmere goat of northern Shaanxi. Four white cashmere goats healthy, similar weight and fixed rumen fistulas were used. Basic diet as the main raw materials corn, wheat bran, soybean meal, rapeseed meal, silage, was prepared according to 1.2 times of NRC (1981) goat raising standard. Then the basic diet respectively added sodium sulfate 2.0 g/kg, 4.8 g/kg, 6.4 g/kg (dry matter basis) into three experimental diets. The study used 4×4 Latin square test design to research different inorganic sulfur ( sodium sulfate ) additives on rumen fermentation parameters, rumen Kp and turnover, rumen fiber degradation and rumen cellulose enzyme activity in non-cashmere goats of northern Shaanxi. The results showed as follows:⑴Adding sodium sulfate did not significantly impact rumen pH, and rumen pH had the increase trend with sodium sulfate increasing. After adding sodium sulfate, rumen NH3-N concentration was significantly lower(P<0.05). Moreover the lower NH3-N concentration was, the higher the level of sodium sulfate.⑵Adding sodium sulfate increased rumen dry matter flux, and did not significantly affect the rumen outflow rate (Kp). Compared with the control group, the rumen total nitrogen flux of adding 2.0 g/kg,4.8 g/kg,6.4 g/kg test groups were respectively markedly increased 0.45 g/d(P<0.05), 0.66 g/d(P<0.05), 0.96 g/d(P<0.05), and the rumen total sulfur flux of adding 4.8 g/kg,6.4 g/kg test groups were improved observably 0.55 g/d(P<0.05), 0.40 g/d(P<0.05).⑶Adding sodium sulfate improved dynamic degradation rate and effective degradation rate of rumen dry matter (DM), neutral detergent fiber (NDF) and acid detergent fiber (ADF), and effect degradation rate added with sodium sulfur increasing. Compared with the control group, when the levels of sodium sulfate were 4.8 g/kg and 6.4 g/kg, the effect degradation rate of rumen DM, NDF and ADF significantly increased(P<0.05). ⑷Adding different doses of sodium sulfate had different effects on rumen major cellulose enzymes activity. When the level of sodium sulfate was 4.8g/kg, rumen carboxymethyl cellulose, pectinase, xylanase activity were highest 16.33μmol/(min·ml), 9.34μmol/(min·ml), 3.51μmol/(min·ml), and the three enzymes activity were significantly higher than the control group(P<0.05), and also filter paper enzyme activity was higher than the control group(P>0.05). While adding sodium sulfate 6.4 g/kg, the 4 kinds of celluloses enzyme activity were lower than the control group.Comprehensive above test results, when diet sulfur was 0.21%, rumen fermentation environment was relatively stable, rumen major cellulose enzymes activity were higher, and the rate of cellulose degradation was bigger.