Abdolhamid Hajebi; Mohammad amin Soltanipoor; mohammad fayaz
Abstract
In order to investigate the preference value of plants, this study was conducted in Sirik rangeland in Hormozgan province. To determine the preferred value in this region, two methods of timing and production and consumption of plant species were used. The results of analysis of variance of the preferred ...
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In order to investigate the preference value of plants, this study was conducted in Sirik rangeland in Hormozgan province. To determine the preferred value in this region, two methods of timing and production and consumption of plant species were used. The results of analysis of variance of the preferred value in both timing methods (using a video camera) and the operating percentage yielded the same results. Because in both methods, there was no statistically significant difference at the level of 5% between the years and months of the study and only a significant difference between species. In the chronological method, Sphaerocoma aucheri with statistically assigned the highest mean (29.8%) along with annuals with an average (28.9%) were placed in a class statistically, followed by Moltkiopsis ciliata and Cenchrus pennisetoformis 9.3 and 7.8, respectively. In the method of exploitation percentage, the highest exploitation percentage was Cenchrus pennisetoformis with 52.9%, although with Heliotropium bacciferum with 49.6%, Moltkiopsis ciliata with 45.8%, Sphaerocoma aucheri with 44.6% and Cyprus conglomeratus with 44.5% were in a group. In the Sirik region, Sphaerocoma aucheri was one of the high density and high consumption species and Cenchrus pennisetoformis was the low density and high consumption species. Sphaerocoma aucheri was in the first place in terms of preference value, but it should be noted that livestock tends to graze more than annuals at the beginning of the growing season and at the end of the growing season with drying or seeding of grasses, annuals are received less attention.
ّFarhad Azhir
Abstract
Knowledge of livestock grazing behavior is one of factors of optimal and sustainable rangeland management. For optimal management of mountain rangelands, a study was conducted in the rangelands of Lavash. This is located in the Central Alborz Protected Area, and grazed by native hybrid cows. Measuring ...
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Knowledge of livestock grazing behavior is one of factors of optimal and sustainable rangeland management. For optimal management of mountain rangelands, a study was conducted in the rangelands of Lavash. This is located in the Central Alborz Protected Area, and grazed by native hybrid cows. Measuring the vegetation characteristics of the rangelands those areas with 30 plots of 1 × 1 square meter, in three survey strips parallel transects with a distance of 50 meters from each other's, and a length of 100 meters in 2018 and 2019. According to the obtained results, the amount of forage consumption was almost twice of what was range capacity. The preference value of most of the studied species was estimated between 32 and 35% by weighing usage forage method. Palatability category and grazed time percent of each plant species was determined by using camera recording. Plant distribution on rangeland and plant cover percent effected on grazed time percent in the last month during grazing season. Hybrid cattle had unique desire to breed most of the species except for three species belong to Poaceae, Bromus tomentellus, Alopecurus textilis and Hordeum brevisubulantum which were considered more palatable. To calculate the weighted average percentage of preference value of each plant type, rangeland manager could be choose a range of decisions about each of the plant species indices include: range production, plant coverage percentage, and plant density, according to the type of vegetation type, the importance of the role of each plant species and other environmental conditions.
Morteza Khodagholi; Razieh Saboohi; mina bayat; Javad Motamedi
Abstract
For the experiment, at the beginning of each growing season, an adult Naiini sheep (3-4 years old) was used as representative of the herd and used in annual censuses. Grazing time measurement continued at the beginning of the growing season and during the four growth stages. Census time at each growth ...
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For the experiment, at the beginning of each growing season, an adult Naiini sheep (3-4 years old) was used as representative of the herd and used in annual censuses. Grazing time measurement continued at the beginning of the growing season and during the four growth stages. Census time at each growth stage was performed one hour after daily grazing, and in three continuous 20-min periods (repeat experiment). Considering the time of concentration of the animal and the tendency of the animal to different species, the palatability class of each plant species was determined. The results showed that during all the years under study, grazing concentration of Naiini sheep on annual species (Grass and Forbes), litter, Stachys inflata, Artemisia sieberi, Stipa arabica, Noaea mucronata and Hertia angustifolia was observed. Based on the results, annual and litter species were classified as Class І species, Stachys inflata as Class II plant and Artemisia sieberi, Stipa arabica, Noaea mucronata and Hertia angustifolia as Class Ш species. The results showed that the palatability of the species was not the same as the change in plant composition during the growing season. Therefore, it is incorrect to consider the same palatability class for each species at different stages of development, and it is necessary to pay more attention to the description of pasture design services when calculating grazing capacity.
Sedigheh Zarekia; Mohammad Fayyaz; Niloofar Zare
Abstract
Defining the preference value of plant species is necessary for planning and management of livestock and rangeland. The purpose of this study was to investigate the preference value of plant species grazed by sheep during the grazing period in Khoshkeh rood Saveh Rangeland of Markazi Province using species ...
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Defining the preference value of plant species is necessary for planning and management of livestock and rangeland. The purpose of this study was to investigate the preference value of plant species grazed by sheep during the grazing period in Khoshkeh rood Saveh Rangeland of Markazi Province using species selection index.
Production and consumption data of species in and out of the enclosure was collected over six months of grazing season for three years to calculate the species selection index. Maximum preference values for Poasinaica (in whole grazing season) and Salsolalaricina (especially November and December) and minimum preference values for Cousiniacylindracea (in whole grazing season and especially in dry years) was recorded. Reduction in rainfall in 2008 increased the percentage of utilization and preference index of species. As in April 2008, Artemisia sieberi with preference index 2 was a relatively palatable species and Noaeamucronata and Stachysinflata with preference index over 2.1 were considered quite palatable species. Salsolalaricina in November and December in all the years with preference index over 1.4 was considered as relatively palatable species.
Salsolalaricina is a critical resource for livestock of steppe rangelands throughout the year, especially from mid-November to mid-March. So that in this time, this species has higher palatability than other species accompanied and with proper grazing management should be prevented from excessive utilization.
M. Fayaz
Abstract
More than half of the area of the country are rangelands. Implementing the principles of proper rangeland management and optimal use of rangeland requires proper stock grazing management. Considering the quality and quantity of forage plants, palatability and preference value of species and rates of ...
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More than half of the area of the country are rangelands. Implementing the principles of proper rangeland management and optimal use of rangeland requires proper stock grazing management. Considering the quality and quantity of forage plants, palatability and preference value of species and rates of species utilization are information needed for proper management of livestock grazing in rangelands. In this study, preference value of three plant species of steppic rangelands including of Iran includingArtemisia sieberi, Stipa arabica and Scariola orientaliswere considere. The studied sites are located in Kerman, Yazd and Isfahan provinces. At first, the vegetation type of each site was determined and and its floristic list was prepared over spring and summer. The selection criteria were used in order to determine the value of preferred species. Random sampling with the plot of one square meter was done in different months and factorial experiment in randomized complete block design was usedto compare preference values and their comparison in different times and places. The results showed that preference value between plant species and studied sites at five percent are significant but there was no significant difference among different months.The interaction of species and stage of grazing was not significant in this research. Moreover, the preference value of Stipa arabica andArtemisia sieberi for sheep grazing were different over different months. The results also reveald that Artemisia sieberi in Nadooshan site has the highest preference value.
