تاثیر متریت بر عملکرد تولیدی و تولید‌مثلی یک مجتمع گاو شیری در استان گیلان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار گروه علوم دامی دانشکده علوم کشاورزی دانشگاه گیلان

2 دانش ‌آموخته کارشناسی ارشد گروه علوم دامی دانشکده علوم کشاورزی دانشگاه گیلان

3 استادیار گروه علوم دامی دانشکده علوم کشاورزی دانشگاه گیلان

چکیده

متریت از جمله بیماری‌های مطرح در گاوداری‌های سنتی و صنعتی است. هدف از این بررسی گذشته نگر مطالعه عوامل مؤثر بر وقوع متریت و نیز اثرات آن بر عملکرد تولیدی و تولید مثلی در گاوداری‌های شرکت سفیدرود بود. داده‌های مربوط به سال‌های 79 تا 83 مورد بررسی قرار گرفت و تجزیه داده‌ها به روش رگرسیون لوجستیک و مدل خطی انجام شد. در این تحقیق میزان بروز متریت در طول پنج سال در دو گله سفیدرود 99/19 درصد بود. نتایج نشان داد که سال و گله اثر معنی‌داری روی بروز متریت داشت (01/0> P) به طوری که بیشترین میزان بروز در سال1382و در گله شماره 1 مشاهده شد اما دو عامل جنس گوساله و فصل تاثیر معنی‌داری روی بروز متریت نداشتند. متریت همچنین تاثیر معنی‌داری روی میانگین تولید شیر تا 5 ماهگی داشت (01/0> P)، به طوری که میانگین تولید شیر تا 5 ماهگی در گاوهایی که دچار متریت بودند و گاوهایی که متریت نداشتند به ترتیب73/20 و 76/21 کیلوگرم در روز بود. علاوه بر این متریت تاثیر معنی­داری روی برخی معیارهای تولیدمثلی داشت (01/0> P)، به طوری که طول روزهای باز در گاوهای مبتلا به متریت 82/17روز بیشتر از گاوهایی بود که دچار متریت نبودند، همچنین فاصله زایش تا اولین تلقیح 33/6 روز طولانی­تر از گاوهایی بود که دچار متریت نبودند اما متریت بر تعداد تلقیحبه ازای آبستنی اثر معنی‌داری نداشت (05/0< P). به طورکلی نتایج این بررسی نشان داد گله و سال بر متریت اثر معنی­داری داشت و متریت بر تولید شیر، تعداد روزهای باز و فاصله زایش تا اولین تلقیح گاوداری‌های شرکت سفیدرود تاثیرگذار بود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of metritis on productive and reproductive performances of a dairy farm complex in Guilan province

نویسندگان [English]

  • M. Mohammadi 1
  • M. Gholinia 2
  • N. Ghavi Hossein-Zadeh 3
1 Associate Professor in Animal Sciences, University of Guilan
2 Former M. Sc. Student in Animal Sciences, University of Guilan
3 Assistant Professor in Animal Sciences, University of Guilan
چکیده [English]

Metritis as one of the substantial disorder is one of the major diseases in dairy farm. The purpose of
this study was to evaluate the detrimental effects of metritis on a dairy farm complex in Guilan
province. Data from years 2000 to 2004 was analyzed using logistic regression procedure. In this
research, rate of metritis during the study period was 19.99 %. Results indicated that year and herd
significantly affected the incidence of metritis (P<0.01). This rate was highest in year 2002 and for the
herd of number 1. The sex and season had not significant effects on the incidence of metritis (P>0.05).
Also metritis had a significant effect on mean milk yield by five months after parturition (P<0.01). The
average milk yield in dairy cows that affected by metritis and cows without metritis were 20.73 and
21.76 kg, respectively. Furthermore, metritis had a significant effect on some of the reproductive
parameters (P<0.01) and the average of days open in the cows with metritis was 17.82 day greater than
the cows without metritis. Also, the average of interval from calving to first insemination was 6.33
days greater than cows without metritis. Metritis had not significant effect on services per conception
(P >0.05). It is concluded that effects of herd and year on metritis and effects of metritis on mean milk
yield and days open were effective.

کلیدواژه‌ها [English]

  • Dairy cow
  • Metritis
  • Milk yield
  • Reproductive Performance
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