abstract             the aim of this study was to evaluate the effect of ajowan essential oils (aeo) on rumen fermentation using in vitro gas production. therefore, different doses of aeo (i.e., 0, 150, 300, 450 or 600 ppm) were added to the syringes of the gas production. a typical diet of growing lambs was used as fermentation substrate.  at the first step, the gas production syringes were in...

the aim this research is the diagnosis of production chains in oil’s regions of iran. for this reason, by using, input-output table for oil’s regions of iran,linkages and production chains are identified. the results of research indicate that although oil and natural gas sectors contain 50 percent of region’s output, but it is not a leading sector. in contrast, manufacturing of species of machi...

the aim of this study was to investigate the effect of steam treatment on nutritive value of date (phoenix dactylifera) leaves. date leaves were chopped and mixed with water or sulfuric acid solution to contain 50% moisture with or without 1% sulfuric acid. steam treatment of the date leaves was carried out using three levels of steam pressure (14, 17 and 20 bar), three reaction times (120, 180...

the nutritive value of pistachio epicarp (pe) was evaluated by in situ and in vitro techniques. chemical analysis indicated that pe was high in crude protein (11.30%) and low in neutral detergent fiber (26.20%). total phenols, total tannins, condensed tannins and hydrolysable tannins contents in pe were 8.29%, 4.48%, 0.49% and 3.79%, respectively. ruminal dry matter and crude protein degradatio...

this study was conducted to determine the chemical composition, metabolizable energy, digestibility and ability of gas production of poa trivialis. samples was collected at three phenological stages including: vegetative growth, flowering and seedling on two different elevations of 1300 to 1500 m and 2000 to 1800 m asl in neor and hir region as the first and second sites, respectively. testing ...

in this expriment, the effect of different levels of ziziphus zizyphus(zz) (0, 30 or 60 mg) on fermentation parameters, total protozoa population  and three sub family of protozoa  entodiniinae, ophryscolecinae, diplodiniinae and family of isotrichdaeandmethane gas production was assessed using in vitro method and a completely randomized design. the rate of gas production for the insoluble frac...

Abstract In this study the wastewater treatment of a gas refinery was investigated by using an aerobic trickle bed filter bioreactor. Using a methanothrophic bacterium was the only difference of this experiment from the common aerobic wastewater treatment processes. In addition to reach the standards of wastewater treatments the other goal of using this special bacterium was the productio...

The present study was conducted to investigate the possibility of using a modified in vitro gas production technique in place of the nylon bag method to estimate protein degradability of alfalfa hay in ruminants. In the in situ experiment dacron bags were filled with 3 g alfalfa hay. This was incubated in the rumen of three ruminally cannulated Ghezel rams for the periods of 0, 2, 4, 8, 12, 16,...

One of the issues concerning the replacement of natural gas by green gas is the seasonal pattern of the gas demand. When constant production is assumed, this may limit the injected quantity of green gas into a gas grid to the level of the minimum gas demand in summer. A procedure was proposed to increase the gas demand coverage in a geographical region, i.e., the extent to which natural gas dem...