Effect of dietary protein level, amino acid balance and feeding level on growth, gastrointestinal tract, and mucosal structure of the small intestine in broiler chickens Harry Kofi Swatson, Robert Gous, Paul Ade Iji and Reza ZarrinkalamAnim. Res., 51 6 (2002) 501-515DOI: https://doi.org/10.1051/animres:2002038