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. 2015 Apr 14;11:94. doi: 10.1186/s12917-015-0409-6

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© Zhao et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Urease activity in the rumen after immunization (A) and ammonia concentration variation after urea was infused into the rumen (B). Values are means (n = 4), with error bars representing standard deviation. The asterisks (*) indicate significant (P < 0.05) difference between the control group and the vaccinated group at the time points.