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Factors Affecting the Calving Interval of Holstein Friesian Cattle in Kharabo Dairy Station

العوامل المؤثرة في طول الفترة بين الولادتين في أبقار الهولشتاين فريزيان في مزرعة خرابو

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 Publication date 2011
and research's language is العربية
 Created by Shamra Editor




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This study was conducted at Kharabo Dairy Station belongs to the Faculty of agriculture, University of Damascus. 553 records for 206 Holstein Friesian cattle were used to study factors affecting the calving interval during 1982 to 2007. Data were exposed eccording to GLM, and analysis of variance was used to determine the calving interval (CI) and the effect of calving year, calving season, parity and interactions on the calving interval, and Duncan test was used to compare means by SPSS program. The overall mean for (CI) was 459.12±4.90 days. and affected significantly (0.001>P) by calving year, but there was no significant effect for calving season, parity and interactions between studied factors on the calving interval. These results suggested that better management, and applaying more efficient administration practices as well as to improving the feeding status may reduce calving interval to typical period of 365 days and increase reproductive and economic efficiency of dairy cattle at Kharabo station.


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Research summary
تُجرى هذه الدراسة في محطة خربو للأبقار الحلوب التابعة لكلية الزراعة بجامعة دمشق، حيث تم استخدام 553 سجلاً لـ 206 من أبقار الهولشتاين فريزيان لدراسة العوامل المؤثرة على فترة الولادة بين عامي 1982 و2007. تم تحليل البيانات باستخدام نموذج الخط العام (GLM) وتحليل التباين لتحديد فترة الولادة وتأثير سنة الولادة، موسم الولادة، وعدد الولادات والتفاعلات بينها. أظهرت النتائج أن متوسط فترة الولادة كان 459.12±4.90 يوماً، وكانت سنة الولادة لها تأثير معنوي على فترة الولادة (0.001>P)، بينما لم يكن لموسم الولادة، عدد الولادات، والتفاعلات بين العوامل المدروسة تأثير معنوي. توصي الدراسة بتحسين الإدارة وتطبيق ممارسات إدارية أكثر كفاءة بالإضافة إلى تحسين حالة التغذية لتقليل فترة الولادة إلى الفترة النموذجية البالغة 365 يوماً وزيادة الكفاءة التناسلية والاقتصادية للأبقار الحلوب في محطة خربو.
Critical review
دراسة نقدية: على الرغم من أن الدراسة تقدم تحليلاً شاملاً للعوامل المؤثرة على فترة الولادة في أبقار الهولشتاين فريزيان، إلا أن هناك بعض النقاط التي يمكن تحسينها. أولاً، لم يتم تناول تأثير العوامل الوراثية بشكل كافٍ، وهو ما قد يكون له تأثير كبير على فترة الولادة. ثانياً، الدراسة تركز بشكل رئيسي على العوامل البيئية والإدارية، ولكنها لم تتناول تأثير الأمراض أو الحالة الصحية للأبقار بشكل مفصل. ثالثاً، كان من الممكن استخدام تقنيات تحليل بيانات أكثر تطوراً لتحليل التفاعلات بين العوامل المختلفة بشكل أعمق. وأخيراً، توصي الدراسة بتحسين الإدارة والتغذية، ولكنها لم تقدم تفاصيل كافية حول كيفية تنفيذ هذه التحسينات بشكل عملي وفعال.
Questions related to the research
  1. ما هو متوسط فترة الولادة لأبقار الهولشتاين فريزيان في محطة خربو؟

    متوسط فترة الولادة كان 459.12±4.90 يوماً.

  2. ما هي العوامل التي لها تأثير معنوي على فترة الولادة؟

    سنة الولادة كانت لها تأثير معنوي على فترة الولادة (0.001>P).

  3. هل كان لموسم الولادة وعدد الولادات تأثير معنوي على فترة الولادة؟

    لا، لم يكن لموسم الولادة وعدد الولادات تأثير معنوي على فترة الولادة.

  4. ما هي التوصيات التي قدمتها الدراسة لتحسين فترة الولادة؟

    توصي الدراسة بتحسين الإدارة وتطبيق ممارسات إدارية أكثر كفاءة بالإضافة إلى تحسين حالة التغذية لتقليل فترة الولادة إلى الفترة النموذجية البالغة 365 يوماً.


References used
Agyemang, K. and L. P. Nkhonjera. (1986). Evaluation of the productivity of crossbred dairy cattle on smallholder and Government farms in the Republic of Malawi. Research Report No. 12 International Livestock Centre for Africa, Addis Ababa, Ethiopia. pp 39
Ajili, N., B. Rekik, A. Ben Gara, and R. Bouraoui. (2007). Relationships among milk production, reproductive traits, and herd life for Tunisian Holstein- Friesian cows. African Journal of Agricultural Research. 2(2): pp. 047-051
Amimo, J. O., R. O. Mosi, J. W. Wakhungu, T. K. Muasya and B. O. Inyangala. 2006. Phenotypic and genetic parameters of reproductive traits for Ayrshire cattle on large-scale farms in Kenya. Livestock Research for Rural Development. Volume18, http: //www.cipav.org.co/ lrrd/lrrd18/10/amimo18147.htm
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