Factors Affecting Body Condition Score and Its Relationship with Productiveand Reproductive Performances of Holstein Cows

محورهای موضوعی : Camel

N. Ghavi Hossein-Zadeh ¹ ( Department of Animal Science, Faculty of Agriculture Science, University of Guilan, Rasht, Iran )
M. Akbarian ² ( Department of Animal Science, Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran )

تاریخ دریافت : 1392/12/20 تاریخ پذیرش : 1393/02/25 تاریخ انتشار : 1393/12/10

کلید واژه: production, dairy cow, body condition score, Reproduction,

چکیده مقاله :

The objective of the present study was to determine factors affecting body condition score (BCS) and its association with productive and reproductive performances in Holstein cows. Mixed model analysis was performed on monthly records of BCS from April 2006 to July 2012 comprising 34666 records from 3134 dairy cows in a large commercial dairy herd under arid climatic conditions of Isfahan in Iran. Body condition scores were recorded on a scale of 1 to 5. Fixed factors included in the final mixed model of analysis were evaluation year, parity and evaluation season and also year by parity, season by parity and year by season interaction effects. Average BCS in the dairy herd was 3.06 ± 0.77. The results showed that there was an increasing trend for BCS over the years from 2006 to 2012 (P<0.001). Also, the recording season of winter provided greater BCS than other seasons (P<0.001). Mean BCS increased from first to third parity but then declined thereafter (P<0.05). The correlation between BCS and milk yield was negative and varied from -0.23 to -0.13 over the parities. The correlation between BCS and fat percentage was low and changed from 0 (fourth and greater parities) to 0.08 (first and second parities). There were low to medium correlations (0.14 to 0.29) between BCS and protein percentage over the parities. The correlation estimates between BCS and days open, calving interval and number of inseminations per conception were low and positive, but the correlation between BCS and conception rate was negative over the parities.

چکیده انگلیسی:

هدف از مطالعه حاضر تعیین عوامل اثرگذار بر امتیاز شرایط بدنی (BCS) و ارتباط آن با عملکرد تولیدی و تولیدمثلی گاوهای هلشتاین است. از یک مدل مختلط برای تجزیه رکوردهای ماهیانه امتیاز شرایط بدنی از آوریل 2006 تا جولای 2012 که مشتمل بر 34666 رکوردهای 3134 گاو شیری در یک گلۀ بزرگ تجاری گاو شیری در شرایط آب و هوایی خشک اصفهان بود استفاده شد. امتیاز شرایط بدنی بر مقیاس 1 تا 5 اندازه­گیری شد. عوامل ثابت برازش یافته در مدل مختلط نهایی تجزیه شامل سال ارزیابی، شکم زایش و فصل ارزیابی و همچنین اثرات متقابل سال و شکم زایش، فصل و شکم زایش و سال و شکم زایش بودند. میانگین کلی امتیاز شرایط بدنی در گله 77/0 ± 06/3 بود. نتایج نشان داد که روند افزایشی برای امتیاز شرایط بدنی در طی سال­ها از 2006 تا 2012 وجود دارد (001/0>P). همچنین، فصل ارزیابی زمستان نسبت به سایر فصول منجر به ایجاد امتیاز شرایط بدنی بیشتری شد (001/0>P). میانگین امتیاز شرایط بدنی از شکم زایش اول تا سوم افزایش یافته و پس از آن کاهش یافت (05/0>P). همبستگی بین امتیاز شرایط بدنی و تولید شیر منفی بوده و از 23/0- تا 13/0- در طی شکم­های مختلف زایش متغیر بود. همبستگی بین امتیاز شرایط بدنی و درصد چربی شیر کم بوده و از 0 (برای شکم زایش 4 و بالاتر) تا 08/0 (شکم‌های زایش اول و دوم) متغیر بود. همبستگی پایین تا متوسطی (از 14/0 تا 29/0) بین امتیاز شرایط بدنی و درصد پروتئین شیر در طی شکم­های مختلف زایش وجود داشت. برآوردهای همبستگی بین امتیاز شرایط بدنی و روزهای باز، فاصله گوساله­زایی و تعداد دفعات تلقیح منجر به آبستنی پایین و مثبت بوده ولی همبستگی بین امتیاز شرایط بدنی و نرخ آبستنی در طی شکم­های مختلف زایش منفی بود.

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