جمال سیف دواتی
هیات علمی گروه علوم دامی دانشگاه محقق اردبیلی
[ 1 ] - بررسی پارامترهای مرتبط با درصد جایگزینی و عایدی ناشی از نگهداری در گله گاوهای شیری با بهینه سازی سامانه تولید
سابقه و هدف: هدف از این مطالعه بررسی پارامترهای مرتبط با درصد جایگزینی و عایدی ناشی از نگهداری در گله گاوهای شیری با بهینه سازی سامانه تولید می باشد. تصمیم های بهینه جایگزینی به عنوان یکی از عوامل موثر بر سود دامداری ها شناخته می شوند، که این تصمیمات بطور مستقیم تحت تاثیر نوسانات قیمت شیر، قیمت لاشه و هزینه جایگزینی قرار می گیرند. وقتی ارزش های کنونی جریانهای نقدینگی آینده گاو کنونی در جایگاه و...
[ 2 ] - تتاثیر تزریق داخل تخم مرغی نانو ذرات اکسید روی بر درصد جوجه درآوری، عملکرد رشد و خصوصیات لاشه جوجه های گوشتی سویه راس 308
The aim of this study was to determine effect of in ovo injection of nanoparticles of zinc oxide on hatching, growth performance and carcass yield of broiler chicks after hatching. In total, 324 fresh hatching eggs were randomly distributed into six treatment groups of 54 eggs per treatment with three replicates of 18 eggs each, and injections were performed on day 15 of incubation. The treatme...
[ 3 ] - بررسی اثرات تزریق داخل تخم مرغی عصاره بره موم بر عملکرد رشد و وضعیت سیستم ایمنی جوجه های گوشتی
The purpose of this study was to determine the effects of in-ovo injection of oil-extracted propolis on the growth performance and immune status of broiler chicks (Ross 308) after hatching. A total of 324 fresh hatching eggs were randomly distributed into six treatment groups of 54 eggs per treatment with three replicates of 18 eggs each. Treatments included sham as negative control (without in...
[ 4 ] - Effect of Different Sources of Selenium on Performance, Health, Growth Factor and Some Blood Parameters of Dairy Calves
The trace elements such as selenium can be included in the diet from a variety of sources. The purpose of this study was to investigate the effects of incorporation of inorganic, organic and nano selenium in the diets of dairy calves on their performance, health, growth factor and some of their blood parameters. Forty-eight newborn Holstein calves were used in a completely randomized design ove...
[ 5 ] - Effect of Saccharomyces Cerevisiae Yeast and Butyrate Monoglycerides on Performance, Blood Parameters and Nutrients Digestibility in Holstein Suckling Calves
The aim of this study was to investigate the effects of saccharomyces cerevisiae yeast and butyrate monoglycerides on the performance, blood parameters and nutrients digestibility in suckling Holstein calves. For this experiment, 32 newly-born Holstein calves (average age 1-8 days; average weight 38±1 kg) were used in a completely randomized design with 2×2 factorial arrangement, 4 treatmen...
[ 6 ] - Investigation of Biological and Economic Changes in Herd of Dairy Cows Using Optimization Models
The aim of this study was to identify the factors affecting the culling of dairy cows and their impact on reproductive performance and costs of the herd so that optimal decisions can be made in replacing dairy cows and thereby increase the annual income of dairy cattle. For this purpose, data collected from four active cattle breeding units in Ardabil province (including biological parameters a...
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