پديد آورنده :
سليماني باغشاه، سمانه
عنوان :
برآورد روند ژنتيكي و فنوتيپي سن در زايش اول، فاصله زايش، روزهاي باز و تعداد تلقيح به ازاي آبستني در گاوهاي هلشتاين استان اصفهان
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
دوازده،56ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمدعلي ادريس، سعيد انصاري مهياري
تاريخ نمايه سازي :
5/11/92
استاد داور :
غلامرضا قرباني، مهدي رحيم ملك
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Estimation of Genetic and Phonotypic Trends for Age at First Calving Calving Interval Open Days and Number of Insemination for Isfahan Holstein Cows Samane Solemani Baghshah Samaneh soleymany@yahoo com September 22 2013 Department of Animal Science Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors M A Edriss edriss@cc iut ac irS Ansari MahyariAbstractFor the current research the records of 62 farms in Isfahan province were available To estimate genetic andphonotypic trends of reproductive traits such as age at first calving calving interval open days and numberof insemination rate the records of 63 866 cows including 167793 reproductive records were employed Farms were covered by Vahdat industrial Agriculturists and Dairymen Cooperative of Isfahan during 1365to 1391 Genetic parameters estimated by linear animal model using Restricted Maximum LikelihoodMethod REML Genetic and phonotype trends were estimated by using regression of average breedingvalues and phonotype values on calving year Herd year season of birth and pregnancy days showed asignificant affect P 0 01 on age in first calving Parity number of insemination calving difficulties anddays from calving to first insemination had a significant affect P 0 01 on calving interval Parity andcalving difficulties had a significant affect P 0 01 on open days Herd year season of calving parity andseason of insemination to pregnancy P 0 01 showed a significant effect on number of insemination Heritability of age at first calving 0 19 0 007 calving interval 0 06 0 005 open days 0 041 0 004 andnumber of insemination 0 071 0 004 were estimated Phonotypic trends of age at first calving calvinginterval open days number of insemination in first parity and number of insemination in second parityonward were estimated to be 3 48 1 08 0 41 0 4 0 42 0 2 0 013 0 0025 and 0 031 0 01 respectively Observed trends for age at first calving calving interval and open days were negative and favorable forreproduction traits Numbers of insemination in first parity and number of insemination in second parityonward were positive and unfavorable for reproduction traits Estimated genetic trends for age at firstcalving calving interval open days for number of insemination in first parity and number of inseminationin second parity onward were estimated to be 0 07 0 06 0 56 0 5 0 02 0 06 0 0015 0 001 and0 0005 0 005 respectively Observed trends for calving interval and open days were negative andfavorable for reproduction traits Age at first calving numbers of insemination in first parity and number ofinsemination in second parity onward were positive and unfavorable for reproduction traitsPhenotype andgenetic trends of age at first calving had a different sign of slops which means these was a goodmanagements system for this traits while there was not enough attention on genetic point of view Key word phenotype and genetic trends age in first calving open days calving interval number ofinsemination
استاد راهنما :
محمدعلي ادريس، سعيد انصاري مهياري
استاد داور :
غلامرضا قرباني، مهدي رحيم ملك
