Effects of Three Herbs on Methane Emissions from Beef Cattle.

The objectives of the present work were to evaluate the in vivo antimethanogenic effects of (CC), (MC) and (CB) on beef cattle fed a high in concentrate diet (forage-to-concentrate ratio [F:C] of 19.4:80.6), and the effects of increasing levels of CC (0%, 2%, 3%, and 4% of the daily DM intake (DMI)) on enteric CH emissions by beef cattle fed a ration low in concentrate (F:C ratio of 49.

Construction and Operation of a Respiration Chamber of the Head-Box Type for Methane Measurement from Cattle.

This paper aims to describe the construction and operation of a respiration chamber of the head-box type for methane (CH) measurements in bovines. The system consists of (1) a head box with a stainless steel frame and acrylic walls, floor, and ceiling; (2) a stainless steel feeder; (3) an automatic drinking water bowl; (4) a hood made from reinforced canvas; (5) an infrared (IR) CH gas analyzer, a mass flow generator, a data-acquisition system; and (6) a steel metabolic box. Six assays were conducted to determine the pure CH recovery rate of the whole system in order to validate it and comply with standards of chamber operation.