Effect of <i>Acacia albida</i> Pods Associated to Polyethylene Glycol on the <i>In vitro</i> Digestibility of Rice Straw Treated with Banana Leaves Ashes Extract in Goat

Abstract

In order to satisfy the feed requirements of animals in short periods, the integration of livestock to plant production appears as a promising route. Thus, the aim of this work was to evaluate the effect of Acacia albida pods associated to polyethylene glycol on the in vitro digestibility of rice straw treated with extract of ashes of banana leaves, incubated with ruminal fluid from a goat. The study was carried out from March to June 2018 in the Research Unit of Animal Production and Nutrition (URPRONAN) and in the Laboratory of Soil Sciences of the University of Dschang. The rice straw and the banana leaves were harvested in the Agricultural Research Institute for Development (IRAD) of Santchou and Dschang respectively; whereas the Acacia albida pods were collected in the Region of Koundoul, locality situated at 25km from Ndjamena in Tchad. At the beginning of the experiment, after the preparation of the ash extract, treatment of rice straw and formulation of the rations, samples were taken in order to determine the chemical composition and evaluate the in vitro digestibility. The results showed that the treatment with ash extract led to an increase in sodium (801 to 900 mg/kg), phosphorus (1537.45 mg/kg), calcium (2440 to 11520 mg/kg), magnesium (1243 to 1410 mg/kg) and potassium (5951.75 to 10276.75 mg/kg) content. Contrarily, it induces a decrease in the content of organic matter (from 90.13 to 81.86%DM), lipids (from 1.39 to 0.39) and NDF (from 96.44 to 77.57). However, the reverse effect was observed with contents in ash (from 9.96 to 18.13%DM). The complementation of rice straw with Acacia albida pods associated or not to polyethylene glycol significantly (p<0.05) improved all the parameters of in vitro digestibility of rice straw treated or not, except the partitioning factor (PF) where the values were comparable (p>0.05). The in vitro digestibility of dry matter and the microbial mass (MM) instead observed a slight decrease. Apart from the residual nitrogen, the highest values of the other parameters of in vitro digestibility were obtained with treated rice straw compared to untreated rice straw. Acacia albida pods associated to polyethylene glycol on the in vitro digestibility of rice straw treated with banana leaves ashes extract improves digestibility's parameters in goat.