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Albaji M.,Shahid Chamran University | Boroomand-Nasab S.,Shahid Chamran University | Naseri A.,Shahid Chamran University | Jafari S.,University of Ramin Agricultural and Natural Resources
Journal of Irrigation and Drainage Engineering | Year: 2010

The main objective of this research is to compare different irrigation methods based upon a parametric evaluation system in an area of 29,300 ha in the Abbas plain located in the Elam Province, in the west of Iran. The soil properties of the study area such as texture, depth, electrical conductivity, drainage, calcium carbonate content, and slope were derived from a semidetailed soil study carried out on the Abbas Plain on a scale of 1:20,000. Once the soil properties were analyzed and evaluated, suitability maps were generated for surface, sprinkle, and drip irrigation methods using remote sensing techniques and geographic information system. The obtained results showed that for 16,125 ha (55.03%) of the study area surface irrigation method was highly recommended; whereas for 16,600 ha (56.66%) of the study area a sprinkle irrigation method would provide to be extremely efficient and suitable; moreover, it was found that 15,425 ha (52.65%) of the study area was highly suitable for drip irrigation methods; however, one soil series coded 9 and covering an area of 2,150 ha (7.34%) was incompatible for sprinkle and surface irrigation systems. For drip irrigation systems the unsuitable lands did not exist in this zone. The results demonstrated that by applying sprinkle irrigation instead of surface and drip irrigation methods, the arability of 21,250 ha (72.53%) in the Abbas Plain will improve. In addition by applying drip irrigation instead of surface and sprinkle irrigation methods, the land suitability of 6,275 ha (21.42%) of this plain will improve. The comparison of the different types of irrigation techniques revealed that the sprinkle and drip irrigation methods were more effective and efficient than the surface irrigation methods for improving land productivity. It is of note, however, that the main limiting factor in using either surface and/or sprinkle irrigation methods in this area is soil texture and the main limiting factor in using drip irrigation methods were soil calcium carbonate content and soil texture. © 2010 ASCE. Source


Nazari M.,University of Ramin Agricultural and Natural Resources | Beigi Nassiri M.T.,University of Ramin Agricultural and Natural Resources | Fayazi J.,University of Ramin Agricultural and Natural Resources | Tabatabaei S.,University of Ramin Agricultural and Natural Resources
Journal of Animal and Veterinary Advances | Year: 2010

In order to estimate variance components 8843 test day milk and fat yields records from first lactation Najdi cattle were used. Data obtained between years of 1989-2005 by animal breeding station of Najdi cattle located in Shooshtar city. Random regression models were studied in respect of different orders of fitting for fixed and random regression. Also, different methods of residual variance in the statistical model assume that included assumption of constant residual variance and different assumption about variable residual variance during lactation. According to the obtained results, the assumption of heterogeneous residual variance during lactation improved characteristics of statistical model. A suitable model with (3, 3) orders of fit for additive genetic and permanent environmental covariance functions to analyze TD fat and milk yield records were recognized. Minimum of heritability for fat and milk yield was estimated at the beginning of lactation (0.1, 0.15), respectively. The amount of this parameter increased to mid lactation and almost in the 5th month of lactation reached to maximum level (0.34 for milk yield and 0.44 for fat yield), then decreased to the end of lactation. © Medwell Journals, 2010. Source


Nazari M.,University of Ramin Agricultural and Natural Resources | Fayazi J.,University of Ramin Agricultural and Natural Resources | Tabatabaei S.,University of Ramin Agricultural and Natural Resources | Aghaei A.,University of Ramin Agricultural and Natural Resources | Mamoei M.,University of Ramin Agricultural and Natural Resources
Journal of Animal and Veterinary Advances | Year: 2010

The main objective of this study was to estimate genetic and phenotypic potential of milk yield, fat yield and fat percentage traits. Data analyzed were 3350 records from buffalo during 1989-2008 were collected. Co-variance components were estimated using uni and multiple traits of animal model with the Restricted Maximum Likelihood method. In this method with constant effects of season-city-year and lactation period and additive genetic was taking as Random effect. The mean and standard deviation for milk yield, fat yield and fat percentage were 964.14±18.28,52.35±1.88 and 5.58±0.03, respectively. The heritability of milk yield, fat yield and fat percentage were 0.22, 0.18 and 0.13, respectively using univariate model. The repeatability of milk yield, fat yield and fat percentage were 0.55, 0.41 and 0.39, respectively using univariate model. The genetic and phenotypic conelation between milk yield-fat percentage, milk yield-fat yield, fat yield-fat percentage was -0.25 and-0.30, 0.75 and 0.25, 0.29 and 0.41, respectively. The heritability for milk yield trait was moderate, soselection on the basis of this trait may cause a desirable genetic gain. © Medwell Journals, 2010. Source


Salabi F.,University of Ramin Agricultural and Natural Resources | Boujarpoor M.,University of Ramin Agricultural and Natural Resources | Fayazi J.,University of Ramin Agricultural and Natural Resources | Salari S.,University of Ramin Agricultural and Natural Resources | Nazari M.,University of Ramin Agricultural and Natural Resources
Journal of Animal and Veterinary Advances | Year: 2011

About 288, lday old Ross 308 broiler were used to evaluate the effect of zinc on performance and carcass characteristics of broiler during Heat Stress (HS). Broilers raised in either a thermoneutral (TN, 23.9°C constant) or HS (23.9-35°C cycling) environment were fed an adequate zinc diet (45 mg kg-1) and high zinc diets (90 and 135 mg kg-1), accomplished by adding a zinc from ZnSO4.7H2O to the ration. The HS birds consumed less feed, gained less weight and had lower feed efficiency when compared to TN birds. Dietary zinc levels did significantly influence broiler growth performance. Lymphoid organs, breast and leg meat yield and liver weights were all reduced by HS. These results indicate that the performance, carcass characteristics of broiler and immune response of broilers can be influenced by the level of zinc in the diet and by environmental conditions. © Medwell Journals, 2011. Source

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