جستجوی مقالات مرتبط با کلیدواژه "انرژی قابل متابولیسم" در نشریات گروه "محیط زیست"

This study, was conducted in one of the rangeland of Lar National Park, Estarkolak and Malek Cheshmeh area (3176 hectares) to estimate the amount of metabolizable energy and daily requirement of animal. In this research, to determine the weight of various classes of Zandi sheep grazing in the Lar National Park rangelands of Estarkolak and Malek Cheshmeh region, three prevalent flocks of Zandi race were selected randomly and from each flock, 60 heads of animals including 20 heads of ewe ageing 3 years old, 20 heads of ewe aging 4 years old, 5 heads of ram aging 3 years old, 5 heads of ram aging 4 years old and 10 heads of lamb aging 3 months were signed and selected in two phases, one at the beginning of the season and the other at the end of season. In the study area, first a topographic map with a scale of 1: 25000 was prepared and the location of the plots was randomly determined on the map and then the rangeland. Inside each plot, all grazable animal plants were identified and according to the size and height, one centimeter of soil surface was harvested. The forage species grazed by sheep at the flowering stage were identified and collected in this rangeland (41 plant species). Having utilized the mean weight of ewes aging 3 and 4 years, the weight of the sheep glazing in the studied region was estimated to be equal to 48.54 ±2.44 kg. The forage species grazed by sheep at the flowering stage were identified and collected in this rangeland. The mean percentage of CP, ADF, DMD and the amount of ME in every kg of dry forage were determined 12.8, 37.54, 57.74 and 7.81 mega joule, respectively. Metabolizable energy and animal daily requirement based on dry matter in maintenance condition for animal unit equivalent of this rangeland were estimated 10.29 mega joule and 1.31 kg respectively. Using the results of this study, new grazing capacity can be determined for this rangeland.

This experiment conducted to investigating the possibility of using in vitro gas production technique using faeces suspension as inocula in place of the rumen liquors for estimation of nutritional value of wheat and barley grains.The chemical compositions of wheat and barley grains were determined by conventional methods. For the in vitro gas production technique, rumen liquor and faeces collected from three cannulated rams. Result indicated that, there were no significant differences between gas production volume of wheat and barley grains with rumen liquor and faeces suspension at different incubation times (except 12 h of incubation in wheat grain). Also, there were no significantly differences between A fraction (gas production volume (ml) of fermentable fraction of feed) and estimated nutritional values in both feeds using rumen liquor and faeces suspension as inocula, but the rate of gas production (c) using faeces suspension was significantly higher than that of rumen liquor. Prediction equations of the amount of gas production using rumen liquor from the gas production volume with faeces suspension is Y=-3.8751+1.0052X for the wheat grain and is Y=-1.7172+1.0367X for barley grain. In addition, there were no significant differences between metabolizable energy (ME), net energy for lactation (NEl), organic matter digestibility (OMD) and short chain fatty acids (SCFA) contents of wheat and barley grains with rumen liquor and faeces suspension. In an overall conclusion, it seems that the sheep faces may be a suitable alternative to rumen liquor in the in vitro gas production method for ruminant feed evaluation.