摘要
以 3头平均体重 (6 0 0± 10 0 )kg、装有永久性瘤胃瘘管的 7岁西杂阉牛为研究对象 ,实验采用 3× 3拉丁方设计 ,研究日粮中不同棉籽水平对肉牛瘤胃机能的影响作用 ,为肉牛日粮中适宜的整粒棉籽添加水平提供参考。 3种试验日粮分别表示为 :⑴对照组 :饲喂基础日粮 ;⑵中棉籽组 :添加 13%棉籽 ;⑶高棉籽组 :添加 2 5 %棉籽。研究结果显示 ,与对照组相比 ,中棉籽组、高棉籽组在一个周期内的pH平均值略有降低 (- 0 .11、- 0 .0 9)。各处理组在同一个时间点的pH值变化不显著 (P >0 .0 5 )。中棉籽组的氨氮浓度平均值最高 (7.0 1mmol/L) ;与对照组相比 ,中棉籽组的氨氮浓度平均值上升 0 .2 9mmol/L ,高棉籽组的氨氮浓度平均值下降 0 .0 7mmol/L。与对照组相比 ,中棉籽组、高棉籽组的总挥发性脂肪酸浓度分别提高 7.4 %、3.5 % ,乙酸和丙酸浓度平均值也较对照组有所提高 ;而丁酸浓度和乙酸 /丙酸值比对照组低。 3种日粮间的乙酸 /丙酸的平均值存在着显著性差异 (P <0 .0 5 ) ,其平均值分别为 4 .4 9、4 .35、4 .0 5。
Three 7-year old Simmental crossbred beef cattle (600±100 kg body weight) fitted with ruminal cannulae were used in a feeding experiment with a 3 x 3 Latin square design to investigate the effects of different levels of cottonseed in diets on rumen fermentation and the digestibility of nutrients for beef cattle, and to give a reference to the optimization of cottonseed level in beef cattle diets. Three experimental diets contained (1) control (CT): basal diet; (2) middle level cottonseed (MC): 13% cottonseed and (3) higher level cottonseed (HC): 25% cottonseed. The results showed that: The mean pH of the treatments MC and HC in a feeding period decreased a little (-0.11, (-0.09)), compared with treatment CT. There were no notable differences among the treatments of the same time in pH (P>0.05). The mean NH_3-N of treatment Mc was the highest (7.01 mmol/L). Compared with treatment CT, the mean NH_3-N of treatment MC increased by (0.29 mmol/L), while treatment HC decreased by 0.07 mmol/L. the mean total VFA of treatments MC and HC increased by 7.4% and 3.5% respectively, compared with CT. The mean acetate concentration and propionate concentration of the treatments MC and HC were higher than that of the treatment CT too, while butyrate concentration and the ratio of acetate concentration to propionate were lower than it. There were significant differences among the mean values of A/P in three diets (P>0.05), and the mean values were 4.49, 4.35 and 4.05 respectively.
出处
《粮食与饲料工业》
CAS
2004年第1期39-41,共3页
Cereal & Feed Industry
