Effect of adding castor oil in the production of total gas and methane production and some fermentation characteristics in laboratory

Abstract

This experiment was carried on in animal nutrition laboratories in the Animal Production Department of the Faculty of Agriculture, University of Baghdad/ Jadriya for the period from 1/12/2016 to 1/5/2017, where adding different percentages of castor oil, 0, 70, 140 and 280 Micrometer/ kg dry matter to a mixture of concentrated 20% and alfalfa hay 80% to study the effect on in vitro and methane total gas production and some fermentation characteristics (pH, ammonia nitrogen concentration). Results: Using the gas production technology in the laboratory, a significant reduction (P˂0.01) was found in the total production of gas and methane in T2, T3 and T4, containing 70, 140 and 280 μl/ kg dry matter of CO oil after 12, 24, 48 and 72 hours of incubation period with T1 control (0% CO). For methane production in T2, T3 and T4, a significant decreased (P˂0.01) was recorded in methane production with increase incubation periods from 12 to 72 hour. T1, T2 and T3 showed a significant decreased (P˂0.01) in the pH values after 12 hours of laboratory incubation compared to the treatment T4 and T1 were recorded a significant decreased (P˂0.01) in the pH values after 24 and 48 hours of laboratory incubation compared to the T4 treatment containing 280 μl/ kg dry matter of CO oil. In the same context, T1 and T3 decrease (P˂0.01) in pH values after 72 hours of laboratory incubation compared with T2 and T4 treatments containing 70 and 140 of CO oil respectively. The results showed T3, T4 of the CO oil was recorded with a significant decrease (p˂0.01) in ammonia nitrogen concentration after 12 hours of incubation compared to T1. The results also showed a significant decrease(P ˂0.01) in the ammonia nitrogen concentration of T2 and T4 after 24 hours of laboratory incubation compared to T1 (control) treatment. There were no significant (P˂0.01) in the concentration of nitrogen ammonia after 48, 72 hours from incubation laboratory