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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The spleen and bursa were excised and weighed to determine indices of the immune organs, expressed as the weight of immune organs to live body weight. (A) spleen index; (B) bursa index. *** p < 0.001.