دانلود گزارش کارورزی و کار آموزی

چکیده : 

Previous studies indicate that increasing plant diversity in pastures may prevent mineral

deficiencies or excesses in grazing animals. We tested the hypothesis by comparing

traditional Mongolian nomadic pastoral grazing through which we expected livestock to

consume more plant species, with grazing in a settled area with less plant diversity. We

recorded the number and types of plant species present and the species consumed by a subsample

of grazing sheep. We measured the mineral composition of dominant plant species,

sheep wool and cattle hair. Plant species diversity in vegetation and rumen contents was

greater in the nomadically grazed area than in the settled area. Animals restricted to grazing

in the settled area predominantly consumed a single plant species with poor mineral

balance. In contrast, the concentration of potentially toxic elements of sheep wool was

lower in the nomadically grazed area. These findings suggest that nomadically grazing may

improve the mineral balance of livestock through the intake of diverse plant species.