Stage of egg production regulates protein turnover and lysine partitioning for broiler breeders

Among the regulators of protein turnover, amino acids play a critical role. Lysine, leucine and isoleucine were found to alter protein synthesis, degradation and its regulation (Yoshizawa, 2004; Nakashima et al., 2005; Tesseraud et al., 2008). Furthermore, Tesseraud et al. (2000) reported that differences in the fractional degradation rates (FDR) between fast-growing and slow-growing birds are observed in young birds but not older ones, suggesting a possible age effect.