[犊牛和绵羊的瘤胃氮代谢。3. 犊牛中干草与精饲料比例的影响]

[Ruminal nitrogen metabolism in calves and sheep. 3. Effect of hay-concentrate ratio in calves].

作者信息

Boldt E, Steinhöfel O, Koffmane H J, Hoffmann M

机构信息

Institut für Fütterung und Ernährungsschäden, Universität Leipzig, Germany.

出版信息

Arch Tierernahr. 1993;43(1):79-90. doi: 10.1080/17450399309386025.

DOI:10.1080/17450399309386025

PMID:8512452

Abstract

During the milk feeding period (ca. 55th day of life) and 2 weeks after the milk feeding period (ca. 80th day of life) the influence of a hay quota in the ration (on DM basis) of 6, 10, 14 and 18% in the milk feeding period and of 16, 23, 31 and 37% in the period after milk feeding was tested as to ruminal N metabolization with calves supplied with duodenal re-entrant cannulae. The increase of the hay quota in the ration for ruminating calves reduced as a tendency duodenal NAN passage, its bacterial N-quota, post-ruminal NAN digestibility and, due to a worse utilization of available N for bacterial N-synthesis, bacterial N-synthesis rate. The apparent fermentation of organic matter was, as a tendency, increased with the growing hay quota in the ration.

摘要

在哺乳期（约出生后第55天）以及哺乳期后2周（约出生后第80天），对安装了十二指肠回流插管的犊牛，测试了日粮中干草配额（以干物质计）在哺乳期分别为6%、10%、14%和18%以及哺乳期后分别为16%、23%、31%和37%时对瘤胃氮代谢的影响。日粮中干草配额的增加，呈下降趋势的有十二指肠非氨氮（NAN）流量、细菌氮配额、瘤胃后NAN消化率，并且由于可利用氮用于细菌氮合成的利用率降低，细菌氮合成率也下降。随着日粮中干草配额的增加，有机物的表观发酵呈上升趋势。