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
Pages
8
From page
37
To page
44
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
Serial Year
2009
Record number
2445171
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