In order to assess the impact of partially substituting yellow maize with mango seed kernel (MSK) at concentrate feed mixtures at the levels of 0, 25, 50, and 75% for T1, T2, T3 and T4, respectively on in vitro gas production, and energy content. In comparison to yellow corn grain, MS has lower CP and NFE levels and greater CF and EE contents. Additionally, when the MS level increased, the content of CP tended to decrease and the content of ash tended to increase. Conversely, as the MS level increase, the contents of CF and EE rose while the content of NFE decreases.
In vitro methane (CH4) and gas production, gas production for soluble and insoluble fractions, and gas productiion rate (c) data showed that T1 recorded significantly (P<0.05) higher gas production than T4 at various incubation times, with non-noticeable differences from T2 and T3. When comparing T1 to T4, the DMI, IVDMD, OMD, ME, NE, and MP were significantly (P<0.05) greater, while T2 and T3 showed negligible differences. Also, comparing T1 to T4, gas production for gas production from soluble fraction (GPSF), gas production from insoluble fraction (GPNSF), and short chain fatty acids is significantly higher (P<0.05), but it does not differ significantly from T2 or T3. According to the results of the current investigation, the kinetics and in vitro gas and methane generations were not adversely affected by partially substituting mango seed kernel MSK at levels of 25 and 50% for yellow corn in the concentrate feed mixtures.