Abstract: A potential weaning diet prepared from sorghum and African yam bean have been previously reported. The diet blends were prepared in five different ratios: 90:10, 80:20, 70:30, 60:40 and 50:50% of sorghum and African yam bean and fed to weaning rats for a period of 35 days. The biological performance of the developed product was determined and compared with cerelac (a commercial weaning food). The results showed the following ranges: PER 0.26-0.43, NPU 79.8-83.1, BV 0.62 -0.73, TND 59.3-65.3. These calculated attributes of developed products were rated in term of percentage with the control sample and it was observed that SA-2 and SA-3 values were either equal or above the control values for the determined attributes. Also, it was observed that there was no significant difference between SA-2 and SA-3 in terms of overall acceptability, weight gained by the animals, calculated PER, NPU, BV and TND. This suggests that supplementation above 20% African yam protein only causes minimal alteration in the nutritive value of sorghum-african yam bean.