Soliman, M. A., Gendy, H. E. and Hanbally, S. E. (2020) “Effects of calf thymus extract and L-carnitine on immunity and growth performance of broiler chickens”, International Journal of Scientific Reports, 6(2), pp. 45–52. doi: 10.18203/issn.2454-2156.IntJSciRep20200194.