EFFECTS OF SUPPLEMENTATION WITH MONENSIN AND VEGETABLE OILS ON IN VITRO ENTERIC METHANE PRODUCTION AND RUMEN FERMENTABILITY OF GOATS

摘要

Seven combinations of monensin (33 mg/kg of the dietary DM) and vegetable oils (coconut oil, palm oil, soybean oil, sunflower oil, canola oil and linseed oil) (33 g/kg of the dietary DM) supplementations were tested to reduce in vitro enteric methane production in goats. Data showed that all treatments from supplementation of monensin and vegetable oils significantly reduced in vitro enteric methane production compared to control from 40.55-48.58%. In addition, total gas production also decreased from7.37-29.47% and number of protozoa decreased from 64.15-75.47% compared with the control. Supplementation of monensin and vegetable oils had no effect on rumen pH, microbial protein, in vitro dry matter digestibility (IVDMD) and in vitro organic matter digestibility (IVOMD), but had effect on ammonia concentration. Supplementation of monensin and vegetable oils effectively lowered total gas production, enteric methane production and number of protozoa in the rumen. However, the best supplementation was monensin-sunflower oil (MSf) which can reduce total gas production up to 29.47%, enteric methane production up to 48.58%, number of protozoa up to 75.47% compared to control (CD), without affecting the process of fermentation in the rumen.