عنوان :
اثر شاخص هاي دمايي - رطوبتي در فصول تابستان و زمستان بر صفات توليد مثلي گاوهاي پرتوليد گاوداري هاي اصفهان
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
دوازده،51ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
احمد رياسي، محمدعلي ادريس
استاد مشاور :
غلامرضا قرباني
توصيفگر ها :
هورمون پروژسترون , بازده توليد مثل
تاريخ نمايه سازي :
26/8/92
استاد داور :
اميرحسين مهدوي، نفيسه سلطاني زاده
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Abstract Heat stress during warm season is considered as a major cause of ecumenical low fertility in animals Heat stress in reproductive tracts can damage the ovarian follicle development steroidogenic capacity oocyte quality and luteal progesterone secretion These factors may increase early and late embryonic mortality In dairy cows heat stress is the inability to dispose of the heat load so that the animal capacity is not enough for opposition the stress The present study was conducted to determine the effects of season of year summer and winter on plasma progesterone levels pregnancy status open days and insemination rate in three Isfahan dairy herds For this purpose ninety Holsteins dairy cows days in milk with different parities and n per parity used in the summer n and winter n In each season blood samples were obtained of five cows per parity Blood sampling was done in day zero AI time and days after artificial insemination Progesterone concentration was determined in blood serum The data of daily maximum minimum and mean of temperature and humidity was obtained from the weather stations near to each farm and the temperature humidity indexes THI were calculated Reproductive parameters such as conception rate number of inseminations and open days were recorded in summer and winter seasons Results showed progesterone levels ng ml in pregnant cows at fourteen days after AI during summer and winter was higher than non pregnant cows P In addition progesterone levels of pregnant cows ten day after AI in winter season was higher P than non pregnant cows Fourteen days after AI non pregnant cows progestrone in winter was higher than non pregnant cows progenstrone in summer P Also the winter progesterone in pregnant cows was higher than pregnant cows in the summer P Progesterone levels in day AI zero and days seven and ten after AI were not significantly affected by season Pregnancy rates in cows that were inseminated in winter were higher than cows inseminated in summer and the differences was significant in all parities P Cows inseminated in winter had lower open days compared with cows inseminated in summer P Number of inseminations in winter was lower than summer and in some parity the differences was significant P or P Generally the results showed season had significant effect on reproductive performance and blood progesterone levels of Holstains dairy cows in Isfahan and the winter season had higher reproductive performance Keywords Season THI progesterone Reproductive performance PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
احمد رياسي، محمدعلي ادريس
استاد مشاور :
غلامرضا قرباني
استاد داور :
اميرحسين مهدوي، نفيسه سلطاني زاده
