稻草或玉米秸秆替代苜蓿对奶牛氮代谢、血清生理生化指标及肝脏和肾脏组织形态变化的影响

发布时间：2018-03-02 04:08

本文关键词： 奶牛氮代谢肝脏血清　出处：《动物营养学报》2017年06期 　论文类型：期刊论文

【摘要】：本试验旨在研究稻草或玉米秸秆替代苜蓿对奶牛氮代谢、血清生理生化指标及肝脏和肾脏组织形态变化的影响。选择45头泌乳中期的经产健康荷斯坦奶牛,随机分成3组,每组15头牛。各组饲喂含不同粗饲料的饲粮,分别为苜蓿组(23%苜蓿干草+7%羊草,AH组)、玉米秸秆组(30%玉米秸秆,CS组)和稻草组(30%稻草,RS组),饲粮精粗比均为55∶45。试验期12周。结果表明:CS组和RS组奶牛的粪氮排泄量显著高于AH组(P0.05),RS组奶牛的尿氮排泄量显著高于AH组和CS组(P0.05)。RS组奶牛的血清尿素氮和肌酸酐含量显著高于AH组(P0.05)。RS组奶牛的血清总胆固醇含量显著高于AH组和CS组(P0.05)。CS组奶牛的血清谷丙转氨酶活性显著高于AH组(P0.05),而血清谷草转氨酶活性显著高于AH组和RS组(P0.05)。各组奶牛的肝脏、肾脏组织切片结构清晰,未见明显异常。由此可见,饲喂玉米秸秆或稻草粗饲料的奶牛粪氮、尿氮排泄量的增加导致奶牛氮的利用效率降低。各组奶牛肝脏和肾脏的组织形态无显著变化,但饲喂玉米秸秆或稻草饲粮可导致奶牛血清中反映肝脏、肾脏健康功能的指标升高。
[Abstract]:The purpose of this study was to study the effects of straw or corn straw on nitrogen metabolism, serum physiological and biochemical indexes, liver and kidney tissue morphology in dairy cows. 45 healthy Holstein cows were randomly divided into 3 groups. Each group of 15 cattle. Each group was fed with a diet containing different roughage, Alfalfa group (23% alfalfa hay 7% Leymus chinensis AH group, corn straw group 30% corn straw CS group) and straw group 30% straw straw group (RS group) and straw group (30% straw / RS group) respectively. The ratio of feed to feed was 55: 45. The experiment period was 12 weeks. The results showed that the fecal nitrogen excretion of the cows in the CS group and RS group was 55: 45. The results showed that the fecal nitrogen excretion of the cows in the control group was 30%. The excretion amount of urine nitrogen in AH group was significantly higher than that in AH group and CS group (P 0.05). RS group was significantly higher than AH group and CS group in serum urea nitrogen and creatinine content. RS group was significantly higher than AH group and CS group in serum total cholesterol content. The activity of serum alanine aminotransferase in group P0.05 路CS was significantly higher than that in group AH, and the activity of serum alanine aminotransferase in group A was significantly higher than that in group AH and group RS. The structure of kidney tissue section was clear and there was no obvious abnormality. It can be seen that cow dung nitrogen was fed with corn straw or straw forage. The increase of urine nitrogen excretion resulted in the decrease of nitrogen utilization efficiency in dairy cows, but there was no significant change in liver and kidney morphology in all groups. However, feeding corn straw or straw diet could result in liver reflection in serum of cows. Indicators of renal health function increased.
【作者单位】：奶牛营养学北京市重点实验室北京农学院动物科学技术学院;浙江大学动物科学学院奶业科学研究所;
【基金】：基金项目国家奶牛产业技术体系(CARS-37)
【分类号】：S823.5

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