پديد آورنده :
اميرپور نجف آبادي، حامد
عنوان :
ارزيابي عوامل موثر بر پيشرفت و تغييرات ژنتيكي در صفت ماندگاري و طول عمر توليدي گاو شيري هلشتاين
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
ده،46ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
سعيد انصاري مهياري، محمدعلي ادريس
استاد مشاور :
محمد دادپسند طارمسري ، علي صادقي سفيد مزگي
توصيفگر ها :
آناليز بقا , سلول هاي سوماتيك , سن اولين زايش
تاريخ نمايه سازي :
21/11/92
استاد داور :
محمد خوروش، مهدي كديور
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Evaluation of Factors Affecting the Survival of Progress and Change Over the Productive Life of Holstein Dairy Cattle Hamed Amirpour Najafabadi Hamediut1390@gmail com December 17 2013 Department of Animal Science Isfahan University of Technology Esfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Saied Ansari s ansari@cc iut ac ir Mohammad Ali Edriss m edriss@cc iut ac ir Abstract Among the economic longevity of dairy cattle breeding goals for each trap In recent decades genetic evaluation of dairy cattle in addition traits characteristics shelf life is also takes into consideration Increase lifetime productivity by reducing replacement costs animals Prtvlyd an important role in increasing profits The aim of this study assessed the genetic and genetic parameters of the productive life of dairy cattle in Isfahan Province Using survival analysis models respectively The Database contains over 35 137 records that are productive life at calving between 1991 and 2012 AD did Data animals were removed uncensored and animals were not removed until the present February 2013 considered censorship Number of observations per herd of at least 20 and at least 10 girls were considered for each parent Estimate genetic parameters using the Weibull model and the software Survival Kit The average life span of animals removed with 937 8 and Animals censored average 1002 8 days Observed by an increase in somatic cells increases the relative risk of removal The milk was divided into five classes which eliminates the risk of milk production in cows that are less than 1 5 mean standard deviation was about 3 5 times more milk than cows that produce more than 1 5 SD of the mean are producing cows and milk production was higher than the mean between 0 5 to 0 5standard deviation of the risk of removal of 1 5 was higher but the fourth and fifth grade the effect of eliminating the risk of not far behind The greater the danger of removing each of the first and fourth stages The relative risk increases with age at first calving age at first calving but had little effect on the length of productive life In this study the value of is equal to 1 326 and heritability estimates in this report are calculated 0 17 Keyword Survival analysis Length of productive life Censoring Somatic cell count Age at first calving PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
سعيد انصاري مهياري، محمدعلي ادريس
استاد مشاور :
محمد دادپسند طارمسري ، علي صادقي سفيد مزگي
استاد داور :
محمد خوروش، مهدي كديور
