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CHENG, H., DILLWORTH, G.A., SINGLETON, P.B., CHEN, Y., MUIR, W.M. EFFECT OF GENETIC SELECTION FOR PRODUCTIVITY AND LONGEVITY ON BLOOD CONCENTRATIONS OF SEROTONIN, CATECHALAMINE AND CORTICOSTERONE OF CHICKENS. JOURNAL OF POULTRY SCIENCE. 2001. V. 80. P. 1278-1285.
CHENG, H., DILLWORTH, G.A., MUIR, W.M. GENETIC SELECTION-INDUCED ALTERATIONS IN EXPRESSION OF CATECHOLAMINE AND SEROTONIN IN CHICKENS. INTERNATIONAL SOCIETY OF APPLIED ETHOLOGY. 2000. P. 15.