بررسی رابطه غلظت ازت اوره شیر (MUN) با پارامترهای باروری در گاوداری‌های شیری شهرستان تبریز

محورهای موضوعی : آسیب شناسی درمانگاهی دامپزشکی

صمد مسافری ¹ , سعید اتحاد ² , حسین کوشاور ³

1 - دانشگاه آزاد اسلامی، واحد تبریز، دانشکده دامپزشکی، گروه علوم درمانگاهی، تبریز، ایران
2 - دانشگاه علوم پزشکی تبریز، مرکز تحقیقات ریزفناوری دارویی، تبریز، ایران
3 - دانشگاه علوم پزشکی تبریز، دانشکده بهداشت و تغذیه، گروه آمار حیاتی و اپیدمیولوژی، تبریز، ایران

تاریخ دریافت : 1390/07/05 تاریخ پذیرش : 1390/11/26 تاریخ انتشار : 1390/06/01

کلید واژه: گاو شیری, ازت اوره خون (BUN), ازت اوره شیر (MUN), عملکرد تولیدمثلی,

چکیده مقاله :

هدف از مطالعه حاضر بررسی تأثیر سطوح متفاوت ازت اوره شیر (MUN) بر عملکرد تولیدمثلی گاوهای شیری پرتولید در گله های شیری منتخب در شهرستان تبریز بود. از مجموع 213 رأس گاو شیری آبستن 5 تا 5/7 ماهه انتخاب شده در این مطالعه 76 رأس معادل 7/35% گاوها دارای سطح MUN کمتر از mg/dl16 و 137 رأس معادل 3/64% گاوها دارای سطح MUN بالاتر از mg/dl 16 بودند. از مجموع 213 رأس گاو مورد بررسی در این مطالعه 124 رأس مبتلا به ورم پستان، عفونت های رحمی، سخت زایی، جفت ماندگی و لنگش بودند که از این تعداد دام بیمار در 81 رأس سطح MUN بالاتر از mg/dl 16 بود. بررسی تأثیر سطوح متفاوت MUN شیر بر بروز بیماری های ثبت شده در این مطالعه نشان داد که تنها بروز سخت زایی در زمان زایمان می تواند متأثر از سطوح متفاوت MUN شیر باشد (032/0=p) و تفاوت در غلظت MUN شیر تأثیر معنی داری بر بروز سایر بیماری ها ندارد. نتایج مطالعه حاضر نشان داد که سطوح متفاوت MUN در شیر تأثیر معنی داری بر پارامترهای تولیدمثلی اندازه گیری شده در این تحقیق شامل روزهای باز، فاصله زایمان تا اولین تلقیح، موفقیت در اولین تلقیح و تعداد تلقیح بازای باروری دارد (همه موارد 001/0>p). همچنین داده های این مطالعه نشان دادند که اندازه گیری غلظت MUN شیر در گاوهای آبستن سنگین می تواند به عنوان یک رهیافت مؤثر در گاوداری های صنعتی به منظور بررسی میزان بهره وری نیتروژن جیره غذایی و پیش بینی وضعیت تولیدمثلی این گاوها در دوره پس از زایمان مورد استفاده قرار گیرد.

چکیده انگلیسی:

The aim of this study was to assess the relationship between milk urea nitrogen (MUN) level and reproductive performance in high yielding dairy cattle houses in Tabriz, Iran. Among 213 selected dairy cattle, 76 heads (35.7%) have MUN < 16.00mg/dl (mean = 15.38 mg/dl) and 137 heads (64.3%) have MUN > 16 mg/dl (mean = 17.46 mg/dl). Our results indicated that MUN level in 81 heads of dairy cattle (total 124 heads) with mastitis, dystocia, laminitis, uterine infections or placenta replacement was higher than 16 mg/dl. We only observed a significantly positive association between MUN levels and dystocia (p= 0.032), while the association between MUN levels and incidence of other diseases was not statistically significant. The results of this study indicated that MUN level significantly influences the reproductive parameters including days open, calving to first service, first service conception risk, and number of services per conception (p<0.001). We concluded that measurement of MUN level in dairy cattle may be an effective approach to assess the outcome of the nitrogenous ingredients of ratios and prediction of reproductive status in post parturition stage. 

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