Showing 3 results for Minerals
Engineer Samira Keramati Jobedar, Dr Farzad Mirzaee Aghcheh, Dr Ardavan Ghorbani, Engineer Bahram Fathi Achachelooee, Engineer Bahman Navid Shad,
Volume 7, Issue 4 (3-2014)
Abstract
The aim of this study was to determine and compare the mineral concentration in the milk of grazing ewes in rangelands of northern and southeastern Sabalan. For this purpose, three range sites in 1800-2100, 2300-2700 and 3200-3700 meter from sea level in the rangeland of south-eastern Sabalan and 1300-1800, 1800-25800 and 2500-3200 m elevations in northern Sabalan were selected as the study site. Soil samples were collected and plant biomass in a 1 m2 were measured and grazed sheep milk grazed in these sites were collected for the measurement of mineral concentrations. The minerals concentrations of Calcium, Phosphorus, Potassium, Magnesium, Sodium, Zinc, Copper, Manganese and Iron in collected samples were measured by atomic absorption spectrophotometer and flame photometer. Data was analyzed in a completely randomized design using SAS9.1 software and the General Linear Model procedure was used for statistical analysis. The results showed that Ca (619.49 mg/kg), P (607.41 mg/kg), K (1399.29 mg/kg), Mg (165.01 mg/kg), Cu (1312.9 µg/kg), Zn (10920 µg/kg) and Mn (732.6 µg/kg) in grazing sheep milk in the site of 1300-1800 m of south-eastern Sabalan were significantly higher (P<0.05). Ca (937.57 mg/kg), P (320.55 mg/kg), Na (924.75 mg/kg), Mg (100.05 mg/kg), Fe (24041 µg/kg), Cu (2384.7 µg/kg) and Mn (1355.79 µg/kg) in grazing sheep milk at 2500-3200m elevation of northern Sabalan were significantly higher (P<0.05). According to the results, of most elements except calcium, copper and manganese in milk of grazed sheep in rangelands of south-eastern Sabalan were significantly higher (P<0.05) than the sheep grazed on northern slopes. . In general, the results showed that the ecological conditions such as altitude and aspect of rangelands has great influence on mineral concentration of sheep milk in Sabalan through their effets on the soil and plant minerals.
Amirarsalan Kamali, Mahmood Dashtizadeh, Abdlomahdi Kabiri Fard, Hossein Khaj, Seyed Abootaleb Sadeghi, Mohammadhadi Sadeghi,
Volume 14, Issue 3 (10-2020)
Abstract
This research was carried out to determine nutritive value of Medicago polymorpha and Malva parviflora in various growth stages. The study was conducted at three rangelands during December 2013 to May 2014. The samples of plants were randomly taken in three stages including vegetative growth, flowering and maturity (seed production). Samples of each stage and place were analyzed for DM, CP, EE, NDF, ADF, ADL, GE, Ca, P, K, Mg, Na, Fe, Mn, Zn, Cu, DMD, OMD and DOMD determination. Randomized Completely Blocks design was used with three treatments (growth stages) and three blocks (studied rangelands). Results showed that NDF and ADF content of plants increased with the growth but their CP, Ash, P, K, Cu, DMD, OMD, DOMD content and Ca content of M. parviflora decreased. Ca, K, Mg, Na, Fe and Mn content of studied plants at different growth stages were higher than those critical limits for Dashtestani sheep with average weight of 50 kg and native goat with average weight of 35 kg, but P content of M. polymorpha at flowering and maturity stages, P content of M. parviflora at maturity stage, Cu content of plants at maturity stage and Cu content of M. polymorpha at maturity stage were less than those critical limits. Totally, these plants are good enough for grazing ruminants specially at vegetative and flowering stages and if possible, it should be increased in the same ranges.
Ardavan Ghorbani, Lida Andalibi, Farid Dadjoo, Kobra Mohammadzadeh Ni, Farzad Mirzaie Aghche Gheshlagh, Kazem Hashemi Majd, Mehdi Moameri, Farzaneh Azimi Motem,
Volume 16, Issue 2 (8-2022)
Abstract
Background and objectives: The role of rangelands in the production of livestock products is important in terms of animal feed production. The value is two-thirds of the total cost of production in different livestock farming units. Rangeland managers consider livestock performance to be the ultimate result of the quality of the rangelands forage. Forage quality is defined as the ability to produce optimal level of livestock yields (meat, milk and wool production). The nutritional value of forage indicates the amount of energy and nutrients available to the animal. The purpose of this study was to determine the minerals and nutritional value of Tanacetum chiliophyllum Sch.Bip. and Potentilla reptans L. (dominant species of region) during three phenological stages (vegetative, flowering, seeding) and in two geographical directions of rangelands in Shoghal Darreh rangelands, Namin County of Ardabil province.
Methodology: Two sites in the Shoghal-dareh area of Namin county in Ardebil province were selected for sampling. The area is in the vicinity of Caspian Sea. Humadity of the area links to the Sea, the West Alborz Mountain. Samples were randomly collected from 50 species. Dried specimens were taken into laboratory for the following, detemination of macro minerals (nitrate, calcium, phosphorus, nitrogen, sodium and potassium), micro minerals (iron, copper, zinc and manganese) and chemical properties (ADF, NDF, dry matter, crude fat, crude ash, and crude protein) using standard laboratory methods at different vegetative stages.
Results: The results were compared using compare mean for statistical analysis and showed that the differences between T. chiliophyllum and P. reptans in potassium, calcium, nitrate, phosphorus, zinc, copper and manganese were significant (P<0.01) and in iron and ash they were significant (P<0.05). Phenological stages made a significant difference (P<0.01) in iron, zinc, manganese and fat. Aspect made a significant difference (P<0.05) in crude protein, dry matter, NDF, iron, calcium and nitrate. According to the results, the amount of macro elements, micro and crude protein levels in different stages of growth were lower than critical and the amount of dry matter was higher than the critical. These results indicate the importance of the role of intrinsic characteristics, growth stage and environmental conditions in determining forage quality characteristics.
Conclusion: The results of this study confirm that plant performance in ecosystems is affected by various factors such as species, aspect and growth stage. Each of these factors can have a significant impact on the quantity and quality of grassland plants. Therefore, studies on the impact of different environmental factors and growth stages needed to enable actuality-based management planning to exploit rangelands properly. The results of comparison of forage quality of two species showed that P. reptans had higher forage value than T. chiliophyllum. It is suggested that grazing systems should operate in such away that while maintaining the rangeland status, the livestock function could be kept at a favorable level.
