عنوان مقاله :
بررسي اثرات شدت هاي چرا بر ميزان مصرف علوفه و عملكرد بز در مراتع استپي منطقه نير استان يزد
عنوان به زبان ديگر :
Study of grazing intensities on goatʹs intake and performance in the Nir steppic rangelands of Yazd province
پديد آورندگان :
باغستاني ميبدي ، ناصر نويسنده , , حسين ارزاني ف علي نيكخواه، مترجم ,
كليدواژه :
عملكرد , استان يزد , دامپروري , استپ , Animal performance , goat , Steppe , Animal live weight , چرا , علوفه , بز , Grazing intensity
چكيده لاتين :
One of the major concerns in rangeland is employing a grazing intensity that leads to high animal production as well as sustainable use of the ecosystem. For this aim, different grazing intensities, by Yazdian goat, were tested on steppic rangelands of Yazd province. Experiment was conducted in Nir Research Station and lasted for two years(2000-2001). It was designed as the randomized complete blocks with three replications. In each block high, low and moderate grazing intensities were compared with control (intact) treatment. Grazing was started at the time of range readiness, in a rotational grazing system in which animals were remained for 15 days within each block. Animal performance was determined by measuring weights, breeding percent, fleece and hair production. The research was also aimed to compare goat diet in the field with proposed by NRC (1981) tables. During two years of study, no significant difference (p<0.05) was found in animal live weight, breeding performance, and fleece and hair production between grazing intensity treatments. Although high grazing intensity treatment led to more efficient use of available forage and was economically more important, but the optimum animal performance and sustainable utilization from rangelands were obtained only in moderate grazing intensity. Low forage quality influenced grazing behavior of goats; though they had a choice in selecting available forage, utilization were limited on about the maintenance diet level. Therefore animal obtained their maintenance diet at lower phosphorus, protein and metabolic energy, as compared with the NRC tables.
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