The objective of the paper was to determine the effects of strain and diet on antibody production to 2 vaccines (Newcastle-NC and Inf. Bronchitis-IB) and to sheep red blood cells (SRBC), cell-mediated response to phytohemagglutinin (PHA), and bursa-spleen (BU-SP) weights. A commercial (COM) and a "country"(CTY) strain of poultries were fed a high (HP) and low (LP) crude protein diets. SRBC response 15 days post-inoculation was higher for COM with HP and for CTY with LP, and no difference was found 1.5 days later. No differences were found for NC, IB, PHA and BU-SP. Phenotypic correlations between live weight (LW) and humoral responses were low. These correlations within strain were negative higher for COM and positive higher for CTY. Between LW and PHA the association was medium and positive and, correlations were close to 0 between PHA-humoral responses. Correlations between humoral responses were medium and positive, and with BU-SP were not different from 0 except for IB.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 27: Reproduction; fish breeding; genetics and the environment; genetics in agricultural systems; disease resistance; animal welf, , 361–364, 1998
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