The effect of gamma was investigated by studying plant germination and growth of feed cowpea seeds criteria. Dry seeds were exposed to gamma sources at different doses ranging from 10 to 30 krad. Results were summarized as follows: all growth parameters lengths, thicknesses and fresh weight of stem and root of irradiated samples increased in comparison with the control sample during the germination period. Developed equations showed that, high relation between stem and root lengths exposed to different Gamma radiation doses (10, 20 and 30 krad) after different days of sowing (5, 10, 15 and 20 days), because of R² was ranged between (0.73 – 0.99), (0.85 – 1.00) and (0.96 – 0.99) for lengths, thicknesses and fresh mass of stem, respectively. There significant differences between the growth parameters and irradiation doses were used. So, it was found that, an increasing length; thickness and fresh mass of stem and root for cowpea plant by increasing irradiation doses compared with control or treatments. Meanwhile, by increasing germination period, it was noticed that, there is a decreasing percentages increase in germination parameters of cowpea seeds by increasing irradiation doses. So, we can reduce the gap of decreases the fodders.