Iji, P.A., R.M. Gous, K. Khumalo, and C. Zamxaka. 2002. “Digestive Enzyme Activities of Broiler Breeder Pullets Suffering from Stunting Syndrome”. International Journal of Poultry Science 1 (4): 78–81. https://doi.org/10.3923/ijps.2002.78.81.