This study examined the effects of anaerobic bio-digestion of cage layer manure and pig manure on the digestates’ proximate and mineral composition, microbial status, and the performance of growing cockerels fed graded levels of the digestates. Cage layer manure and pig manure were bio-digested for six weeks, after which the digestates were oven-dried, analysed for proximate and mineral composition, and incorporated into the diets of growing cockerels. The birds were randomly allotted to six dietary groups in a 2×3 factorial arrangement comprising two types of bio-digested manure (cage layer and pig manure) and three inclusion levels (0, 10 and 20%), with each treatment replicated thrice using ten birds per replicate. Proximate analysis showed that bio-digested pig manure had significantly higher crude protein content, whereas potassium, sodium, phosphorus and calcium were significantly higher in bio-digested cage layer manure. For the main effect of manure type, bio-digested pig manure supported higher weight gain than cage layer manure, and among inclusion levels, birds fed 10% bio-digested pig manure recorded the highest weight gain. These findings indicate that bio-digested pig manure can be included in the diet of growing cockerels at up to 10% without adversely affecting performance.