不同日粮类型对杜泊羊瘤胃pH、氨态氮和挥发性脂肪酸浓度的影响  

Effects of Different Diet Types on Ruminal pH, NH_3-N and VFA Concentration of Dorper Sheep

作　　者：李洪涛[1] 杨在宾[1] 杨维仁[1] 姜淑贞[1] 张桂国[1] 张庆[1] 张崇玉[1] 

机构地区：[1]山东农业大学动物科技学院,山东泰安271018

出　　处：《中国畜牧杂志》2017年第3期67-72,共6页Chinese Journal of Animal Science

基　　金：山东省肉羊良种工程项目

摘　　要：本试验旨在研究玉米-羊草型(MLC)、小麦-羊草型(WLC)、玉米-地瓜秧型(MSP)和小麦-地瓜秧型(WSP)4种类型日粮对杜泊羊瘤胃发酵的影响。选用4头体重相近(55.10±1.24)kg、安装有永久性瘤胃瘘管的健康杜泊羊为试验动物,采用2×2析因设计,4×4拉丁方饲喂方式,连续进行4期动物试验,每期试验18 d,预试期12 d,正试期6 d。结果表明:适应性试验表明,突然更换日粮后,玉米组pH在第6天恢复到日粮更换前水平,而小麦组在第7天恢复到日粮更换前水平;玉米羊草组氨态氮(NH_3-N)浓度在第7天回升到日粮更换前水平,其余三组均在第8天回升到更换前水平。各处理间pH差异显著(P<0.05),杜泊羊采食后8 h内,羊草组pH显著高于地瓜秧组(P<0.05);各处理间瘤胃液NH_3-N浓度差异显著(P<0.05),杜泊羊采食后6 h内,小麦组显著高于玉米组(P<0.05);各组间总挥发性脂肪酸(TVFA)浓度差异显著(P<0.05),且有交互作用;小麦组的乙酸浓度显著高于玉米组(P<0.05),4组的丙酸、丁酸、戊酸浓度存在显著差异,地瓜秧组显著高于羊草组(P<0.05);而玉米组的异戊酸浓度显著高于小麦组(P<0.05);羊草组乙酸/丙酸比值显著高于地瓜秧组(P<0.05)。由此可见,小麦型日粮可获得较高的NH_3-N浓度,而玉米型日粮可获得较高的乙酸和异戊酸浓度;羊草型日粮可获得较高的瘤胃pH和乙酸/丙酸比值,而地瓜秧型日粮可获得较高的丙酸、丁酸、戊酸的浓度,TVFA浓度受精料和粗饲料的共同影响。This experiment was conducted to study the effects of four types of diets： MLC（Maize- Leymus chinensis）, WLC（wheat- Leymus chinensis）, MSP（maize-sweet potato vine） and WSP（wheat-sweet potato vine） in Dorper sheep rumen fermentation. 4 head similar weight（ 55.10 ± 1.24 kg）, installed permanent rumen fistula health Dorper rams weve selected as experimental animals, Continuous phase 4 animal experiments, each experiment lasted for 18 days, the pre phase 12 d, test period d 6, The results show that adaptability test showed that after a sudden change of diet, the pH of maize groups recovered to the prior diet level at d 6, and the wheat recovered to the prior diet level in the d 7; The NH_3-N concentration of the MLC group recovered to prior dietary replacement level in the 7 d, and the remaining three groups recovered at d 8. within 8 hours after Dorper sheep feeding, the pH value of the LC（ Leymus chinensis） groups was significantly higher than that of the SP（ sweet potato vine） groups（P0.05）. From the rumen NH_3-N concentration, the mean of the wheat groups was significantly higher than that of the maize groups（P0.05）, the wheat groups were significantly higher than that of the maize groups within 6 hours after Dorper sheep feeding（P0.05）. From the TVFA concentration, the difference between the groups was significant（P 0.05）, and there was interaction. The acetic acid concentrations of the wheat groups was significantly higher than that of the maize groups（P 0.05）, four groups of propionic acid, butyric acid and valeric acid concentrations, the SP groups were significantly higher than that of LC groups（P 0.05）; and isovaleric acid concentration of maize groups was significantly higher than that of wheat（P 0.05）. And from the ratio of acetic acid / propionate（A/P）, the LC groups were significantly higher than that of the SP groups（P 0.05）. It can be concluded that the wheat diets could obtain high concentration of NH_3-N, but the maize diets could ob

关 键 词：日粮类型 杜泊羊 瘤胃 PH 氨态氮 挥发性脂肪酸 

分 类 号：S827.5[农业科学—畜牧学]