شناسايي كيفيت و ارزش غذايي گياهان به دليل اهميت آنها در تغذيه دام كمك مؤثري در توصيف جيره غذايي دام مي نمايد. همچنين، تعيين كيفيت علوفه يكي از مهمترين عواملي است كه در جهت مديريت صحيح مراتع لازم است. در اين تحقيق كيفيت دو گونه علوفه از خانواده شپه كندميان، بوني ( Aeluropus lagopoides) و لولبوم ( Loulium perenne) در مراتع سيستان در سه مرحله فنولوژيكي مورد بررسي قرار گرفت. ابتدا نمونه هاي گياهي در سه مرحله رويشي، گلدهي و بذر دهي جمع آوري و سپس نمونه ها بلافاصله به آزمايشگاه منتقل و پس از آسياب آنها، تركيبات شيميايي، گوارش پذيري ماده آلي و انرژي قابل متابوليسم به روش توليد گاز (in vitro) تعيين شد. نتايج نشان دهنده تغييرات قابل ملاحظه اي در تركيب شيميايي گياهان مورد بررسي در مراحل مختلف فنولوژيكي بود ( 0/05>P). با پيشرفت مرحله رشد، از مقدار پروتئين خام، گوارش پذيري ماده آلي كاسته و بر ميزان فيبر افزوده شد ( 0/05>P). بيشترين ميزان حجم گاز توليدي در 96 ساعت، گوارش پذيري ماده آلي و انرژي قابل متابوليسم مربوط به مرحله رويشي بوني بود ( 0/05
چكيده لاتين :
Identification of the quality and nutritive value of plants due to its importance in animal
nutrition can effectively help describe of animal feed diet. Also, determination of forage
quality is one important factor that is necessary for the proper management of
rangeland. In this study, quality of forage two species, like grasses family, Bonnie
(Aeluropus lagopoides) and Lulium (Loulium perenne) of Sistan pastures in
phenological stages were examined. Plant samples in the vegetative stage, flowering
and seeding were collected and then immediately transferred to the laboratory and after
the grinding, chemical compounds by standard method, organic matter digestibility and
metabolizable energy by gas production technique (in vitro) method were determined.
Results indicated significant changes in the chemical composition of the plants in
different phenological stages (P<0.05). With developing of growth stage, the amount of
crude protein, organic matter digestibility and metabolizable energy decreased and the
rate of cell fibers were increased (P<0.05). The maximum amount of gas volume
produced in 96 hours, organic matter digestibility and metabolizable energy was related
to vegetative stage of Aeluropus lagopoides (P>0.05). Aeluropus lagopoides forage
quality in the vegetative stage, the best nutritive value compared to other phases of
Aeluropus lagopoides and different phenological stages of Loulium perenne. The results
showed that the development of growth stage and thus increasing the proportion of cell
wall components caused a significant decrease in the nutritive value. Therefore
recommended the vegetative stage of the plants used by domestic animals that are more
favorable nutritive value.