Other language title :
ﺑﺮرﺳﻲ ﻣﺪل آﻣﺎري اﺛﺮ ﻟﻨﮕﺶ ﺑﺮ ﺣﺬف ﮔﺎوﻫﺎي ﺷﻴﺮي در ﮔﺎوداري ﻫﺎي اﺳﺘﺎن ﺗﻬﺮان
Title of article :
Modeling the Effect of Lameness on Culling of Dairy Cows in Tehran Province
Author/Authors :
Bahonar, Alireza Department of Food Hygiene and Quality Control - Faculty of veterinary medicine - University of Tehran , Sharifi, Hamid Department of Food Hygiene and Public Health - Faculty of Veterinary Medicine - Shahid Bahonar University of Kerman , Bokaie, Saied Department of Food Hygiene and Public Health - Faculty of Veterinary Medicine - Shahid Bahonar University of Kerman , Vodjgani, Mehdi department of Clinical Science - Faculty of veterinary medicine - University of Tehran , Rahimi Foroushani, Abbas Department of Epidemiology & Biostatistics - School of Hygiene - Tehran University of Medical Sciences , Haghdoost, Ali Akbar Research Center for Modeling in Health - Kerman University of Medical Sciences
Abstract :
Objective-To assess the effect of lameness on culling of dairy cows in Tehran
province.
Design- Historical cohort study.
Study population and procedures- 7067 first- and second-parity Holstein dairy cows
that calved from March, 21 2007 to March, 20 2008 were until next calving or culling.
Logistic regression was conducted data.
Results-The overall lactational culling rate for eligible cows in the study was 22.09%
(95% CI: 19.26-24.9%). Lameness was an important factor in the model and increased
odds of culling (OR= 1.32; 95% Confidence interval = 1.15-1.51). Moreover, parity,
60-day cumulative milk yield, and herd size increased culling odds. We did not find
evidence for a significant effect of calving season on culling.
Conclusion- Lameness is an important factor in culling decision in dairy herds in this
area.
Farsi abstract :
هدف- بررسي اثر لنگش بر روي حذف گاوهاي شيري در گاوداري هاي استان تهران.
طرح مطالعه- مطالعه همگروهي تاريخي.
1386 زايش داشتند. اين /12/ 1386 تا 29 /1/ جمعيت مطالعه و روش كار- 7067 گاو شيري نژاد هلشتاين كه در فاصله 1
گاوها تا زايش بعدي يا حذف مورد مطالعه قرار گرفتند. رگرسيون لجستيك جهت آناليز داده ها به كار گرفته شد.
22 درصد (فاصله اطمينان 95 درصد: / نتايج- ميزان حذف كلي در يك دوره شيردهي جهت گاوهاي مورد مطالعه 09
; % 1( با دامنه اطمينان 95 / 19/26 ) به دست آمد. لنگش يك فاكتور مهم در مدل فوق بود و شانس حذف را 32 - 24/9
1/15- ) برابر افزايش داد. به علاوه، شكم زايش، ميزان توليد شير 60 روزه و اندازه گله شانس حذف را افزايش دادند. 1/51
اما رابطه معني داري بين فصل زايش و حذف پيدا نشد.
نتيجه گيري- لنگش فاكتور مهمي در تصميم گيري جهت حذف در گله هاي گاو شيري در اين منطقه مي باشد
Keywords :
culling , dairy cow , logistic regression , Tehran province
Journal title :
Astroparticle Physics
