Document Type : Research Paper
Authors
1 Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran
2 Assistant Professor, Faculty of Natural Resources, University of Urmia, Urmia, Iran
3 Professor, Faculty of Agriculture, University of Tehran, Karaj, Iran
4 Assistant Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran
Abstract
Information on animal requirements is essential to calculate rangeland grazing capacity. Therefore, animal weight and animal unit equivalent (AUE) of each breed should be determined independently. In this research, live weight of Kabodeh sheep was determined based on average live weight of 3 and 4 years old ewes. For this purpose, two herds of Kabodeh breed were selected. In each herd, 15 three–year-old ewes, 15 four-year-old ewes, 5 three-year-old rams, 5 four year-old-rams, 10 three-month-old lambs and 10 six-month--old lambs were selected. They were weighed two times including at the time of grazing season in lowland and highland rangelands. For determination of dry matter requirement, forage quality was taken into consideration. According to the results, animal weight for herds (three and four years old ewe) was 52.66±0.86 kg. Therefore, animal unit equivalent (AUE) for rams, ewes, 3 and 6-month-old lambs were 1.07, 1.66, 0.38 and 0.51, respectively. According to MAFF equation (1984), daily metabolizable energy requirement for maintenance condition was calculated 9.89 and 10.60 Mj (including that multiplied by 1.4 and 1.5) by considering condition of rangelands and distances from watering points and plant density in lowland and highland rangelands. Dry matter requirement was calculated 1.98 and1.80 kgbased on forage quality in lowland and highland rangelands.
Keywords
)