Study On Nutrition Function Of Boron In Sheep

Three 6-month-old male lambs with an average live weight of 41.1±3.5kg, in a 3×3 Latin square design, fitted with rumen cannulas were used to evaluate the effect of boron levels in diets on nutrient availability, blood biochemistry index and nutrient degradability in rumen in sheep. The three rations were a base diet, 113mg boron/kg diet and 226mg boron/kg diet. A 10-day adapting period and 5-day experiment period were used.The result of the metabolic trial indicated that the availability of crude protein(CP)and energy in sheep was not significantly different with increasing boron content in diets(P>0.05). The availability of CP and energy was the highest in 226mg boron/kg diet and was 0.86% and 11.14% higher than in the control group. The effect of 226mg/kg diet on the availability of energy was greater than on that of CP. For the availability of minerals, there was not significantly different between boron groups and control group. The availability of Ca, P, Zn and Mg increased with increasing boron content in diets. The availability of Cu was the highest in 113mg boron/kg diet and the lowerst in 226mg/kg diet. The availability of Fe decreased with increasing Boron content in diets. The availability of Ca, P, Zn and Mg was 5.12%, 4.96%, 22.30% and 6.81% higher in 226mg boron/kg than in the control.The result of blood trial showed serum Glocuse of sheep for addition of boron was lower than that for the control, but no difference. The contents of TG, total cholesterol(TC), high density lipoprotein(HDL), serum total protein(TP), albumin and globulin were not significantly different among each groups. The content of serum urea nitrogen (UN) was decreased by addition of boron in diets(P<0.05). The effect of 226mg boron/kg diet on serum creatinine was significantly different(P<0.05). Serum GPT between 226mg boron/kg diet and other groups was significantly different(P<0.05), but GOT activity, the ratio of GOT activity to glutamyltranspeptidase among each groups were not different. Serum Ca was significantly influenced by boron(P<0.05). Serum P between 113mg boron/kg diet and other diets was different(P<0.05). The effect of boron on serum T3 and T4 was not significantly different among each groups(P>0.05).　　The result indicanted the degradation of DM and CP in rumen increased with incubation time and was not influenced by boron during 6~48h. For incubating 24h, degradation of DM was significantly different among experiment groups, boron didn't alter the degradation of ADF and NDF. For incubating 6h, the degradation of ADF in 226m-g boron /kg diet was significantly higher than that in the control(P<0.05). During 6~24h, boron could increase degradation of NDF(P>0.05). For incubating 24h, degradation of NDF was significantly different among each experiment groups(P<0.05).Master Candidate: Sun JinyanSupervisor: Asso Prof. Liu DasenMajor: Animal Nutrition and Feed Science...