نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم درمانگاهی دانشکده دامپزشکی دانشگاه شیراز

2 'گروه علوم درمانگاهی دانشکده دامپزشکی دانشگاه شیراز

3 هیات علمی دانشگاه شیراز، تخصص: ژنتیک و اصلاح نژاد دام/ ژنتیک کمی/ اصلاح نژاد گاو شیری

چکیده

هدف از این پژوهش، بررسی شیوع و عوامل خطر سندرم واکلی در گاوهای هلشتاین استان اصفهان بر اساس اطلاعات زایش و تلقیح زایش‌های یک تا هفت، سال‌های 1372 تا 1392 از 91727 گاو مربوط به 62 گله بود. گاوهای بدون علایم بالینی مشخص، که برای آبستنی دست‌کم نیازمند سه تلقیح بودند، واکل در نظر گرفته شدند. یک مدل رگرسیون لجستیک چندمتغیره برای تعیین کمیت عوامل خطر مربوط به واکلی در نظر گرفته شد. میانگین کمترین مربعات تعداد تلقیح به ازای هرآبستنی برای گاوهای طبیعی 15/0±15/2 و برای گاوهای واکل 15/0±54/2 و میانگین‌های تصحیح نشده بهترتیب 73/2 و 28/3 تلقیح بود. گله، تولید شیر، فصل زایمان و فصل نخستین تلقیح، سخت‌زایی، مرده‌زایی، سقط و تعداد روز از زایمان تا اولین تلقیح، مهم‌ترین عوامل خطر برای سندرم گاو واکل بودند. متوسط شیوع واکلی 7/43 درصد و در محدوده 8/27 تا 2/55 درصد برآورد شد. سخت‌زایی و مرده‌زایی شانس ابتلا به واکلی را بهترتیب 39 و 11 درصد افزایش ‌داد (01/0 >P ). شانس واکل شدن گاوهای پرتولید 79 درصد بیشتر از گاوهای کم‌تولید بود (01/0 > P). شانس واکل شدن گاوهایی که در دوره پیشین واکل بودند، 28 درصد بیشتر از گاوهای غیرواکل بود. مقدار چربی شیر و طول دورۀ خشکی، اثر معنی‌داری بر واکلی گاوها نداشتند. بر اساس نتایج این تحقیق، در نظر گرفتن دستکم 75 روز برای نخستین تلقیح پس از زایش و اولین تلقیح پس از زایش در فصلهای خنک‌تر، کاهش سخت‌زایی و بهبود مدیریت تولیدمثلی برای گاوهای پرتولید، می‌تواند در کاهش سندرم واکلی مؤثر باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Prevalence and risk factors of repeat breeder syndrome in Isfahan Holstein cows

نویسندگان [English]

  • Navid Golestani 1
  • Asghar Mogheiseh 2
  • Mojtaba Kafi 1

1 Department of Clinical Science, School of veterinary science, shiraz university

2 Department of Clinical Sciences, School of Veterinary Medicine, Shiraz university

چکیده [English]

The aim of this study was to determine the incidence and quantify risk factors associated with repeat breeder (RB) syndrome in Isfahan Holstein dairy cows. Calving and insemination data of parities 1 to 7 on 91727 Holstein dairy cows from 62 herds collected during 1993 to 2013 were used. Cows failed to conceive after three or more regularly spaced services in the absence of detectable abnormalities regarded as RB. A multivariate logistic regression model was used to quantify risk factor associated with repeat breeding. Least squares mean number of services per conception were 2.15 ± 0.15 and 2.54 ± 0.15 for normal and RB cows, and uncorrected values were 2.73 and 3.28 for normal and RB cows, respectively. Herd, milk yield, season of calving and season of first insemination, dystocia, stillbirth, abortion and days from calving to first service were the major factors affecting RB syndrome. Average incidence of repeat breeding was 43.7% (27.8-55.2%). Dystocia and stillbirth increased the odds of being RB by 39% and 11%, respectively (P< 0.01). Risk of being RB in high producing cows increased by 79% compared to cows with low milk yield (P< 0.01). Odds of being RB increased by 28% in cows that was RB in previous parity. Fat yield and length of dry period had no significant effect on being RB. Considering at least 75 days distance between calving and first service, insemination in cool seasons, decreasing dystocia and improving reproduction management of high producing cows, could reduce RB syndrome.

کلیدواژه‌ها [English]

  • Dairy Cows
  • Odds ratio
  • Repeat breeder syndrome
  • risk factors
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