不同加工处理日粮对绵羊瘤胃挥发性脂肪酸的影响

选用3只健康并安装永久性瘤胃瘘管的杂种羯羊,平均体重为24 kg,采用3×3无重复拉丁方试验设计,用3种不同日粮(全混合颗粒料日粮、粉碎精料+铡短粗料日粮和未粉碎精料+铡短粗料日粮)来研究对绵羊瘤胃挥发性脂肪酸(VFA)浓度的影响。结果表明,采食未粉碎精料+铡短粗料日粮绵羊的瘤胃总挥发性脂肪酸(TVFA)浓度显著高于采食全混合颗粒料日粮绵羊(P＜0.05),采食未粉碎精料+铡短粗料及粉碎精料+铡短粗料日粮的绵羊瘤胃丙酸摩尔比显著或极显著高于采食全混合颗粒料日粮绵羊(P＜0.05,P＜0.01),而(戊酸+异戊酸)摩尔比极显著低于全混合颗粒料日粮绵羊(P＜0.01),乙酸/丙酸显著或极显著低于采食全混合颗粒料日粮绵羊(P＜0.05,P＜0.01)。因此,用粉碎精料+铡短粗料或未粉碎精料+铡短粗料日粮饲喂绵羊能改善绵羊瘤胃发酵类型。

Effect of Different Processed Diets on the Concentration of Volatile Fatty Acid in Sheep Rumen

Three crossbred wethers fitted with permanent rumen fistula were chosen to measure the effect of different processed diets on parameters of the concentration of volatile fatty acid in sheep rumen.A 3×3 Latin square experiment design was adopted and the sheep were allotted in one of three diet-treatments,which were complete diet pellet,ground concentrate and cut roughage,and unground concentrate and cut roughage.The results showed that the concentration of TVFA of sheep fed unground concentrate and cut roughage was significantly higher than that of sheep fed complete diet pellet(P<0.05).The molar ratio of propionate of sheep fed ground concentrate and cut roughage as well as unground concentrate and cut roughage were higher than that of sheep fed complete diet pellet(P<0.05,P<0.01),but the molar ratio of(valerate and isovalerate) was significantly lower(P<0.01),and acetate/propionate was lower than that of sheep fed complete diet pellet significantly(P<0.05,P<0.01).It suggested that the diets type of ground concentrate and cut roughage or unground concentrate and cut roughage could improve the type of fermenting in sheep.