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Description of lactation curve and some factors affecting it in Shami cattle

توصيف منحنى إنتاج الحليب في الأبقار الشامية و بعض العوامل المؤثرة فيه

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 Publication date 2012
and research's language is العربية
 Created by Shamra Editor




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This study conducted at Deir Al-Hajar Station during the season 2010-2011 to describe the lactation curve of Shami cattle and determine factors affecting its shape compenents. 1120 records of 356 Shami cows collected between 1997 – 2010 were used. Data were subjected to general linear model, and the analysis of variance used to determine the effect of factors. Duncan test was used to compare the means using SAS system (1996) and Incomplete gamma functions were used to estimate the parameters of lactation curve (a, b and on the basis of daily yield of milk. Results indicated that the average values of the gamma parameters were 2.14 ± 0.01 kg for a (beginning of milking ), 0.61 ± 0.02 kg for b (increasing milk production up to peak) and - 0.23± 0.01 kg for c (decreasing milk production from peak to dry). The effect of calving year was significant (p<0.01) on a, and (p<0.05) on b and (p<0.001) on c. The effect of age at calving and sex of calf was significant (p<0.01) on a but non significant on b and c. Season of calving, parity, and interaction between age and parity was not significant on all parameters. It was concluded that improving the productive performance of Shami cattle, requires applying a long term genetic improvement program to select the best herd.


Artificial intelligence review:
Research summary
أجريت هذه الدراسة في محطة بحوث دير الحجر خلال عامي 2010-2011 بهدف توصيف منحنى إنتاج الحليب للأبقار الشامية ودراسة تأثير بعض العوامل عليه. تم استخدام 1120 سجلاً من 356 بقرة شامية جُمعت بين عامي 1997-2010. استخدم النموذج الخطي العام وتحليل التباين لتحديد تأثير العوامل المختلفة، واختبار Duncan لمقارنة المتوسطات باستخدام برنامج SAS. كما استخدمت دالة غاما غير الكاملة لتقدير معالم منحنى إنتاج الحليب (a, b, c). أظهرت النتائج أن متوسطات قيم معالم منحنى إنتاج الحليب كانت 2.14 ± 0.01 كغ لدالة a، و0.61 ± 0.02 كغ لدالة b، و-0.23 ± 0.01 كغ لدالة c. كان لسنة الولادة تأثير معنوي على دالة a وb وc، بينما لم يكن لفصل الولادة والموسم الإنتاجي تأثير معنوي. أوصت الدراسة بضرورة تطبيق برنامج تحسين وراثي طويل الأمد لانتخاب قطيع نواة عالي الإنتاج من الأبقار الشامية.
Critical review
تعد هذه الدراسة مهمة لفهم منحنى إنتاج الحليب في الأبقار الشامية وتحديد العوامل المؤثرة عليه. ومع ذلك، هناك بعض النقاط التي يمكن تحسينها. أولاً، كان من الأفضل توسيع نطاق الدراسة لتشمل مناطق جغرافية مختلفة لتحسين تعميم النتائج. ثانياً، لم يتم تناول تأثير العوامل البيئية بشكل كافٍ، مثل نوعية الأعلاف والمناخ، والتي يمكن أن تكون لها تأثير كبير على إنتاج الحليب. ثالثاً، كان من الممكن استخدام تقنيات تحليل بيانات أكثر حداثة لتحسين دقة النتائج. أخيراً، كان من المفيد تضمين توصيات عملية للمزارعين بناءً على النتائج لتحسين إنتاجية الأبقار الشامية.
Questions related to the research
  1. ما هي العوامل التي تم دراستها في هذه البحث لتحديد تأثيرها على منحنى إنتاج الحليب؟

    تم دراسة تأثير سنة الولادة، فصل الولادة، الموسم الإنتاجي، العمر عند الولادة، وجنس المولود على منحنى إنتاج الحليب.

  2. ما هي القيم المتوسطة لمعالم منحنى إنتاج الحليب التي تم تحديدها في الدراسة؟

    بلغت متوسطات قيم معالم منحنى إنتاج الحليب 2.14 ± 0.01 كغ لدالة a، و0.61 ± 0.02 كغ لدالة b، و-0.23 ± 0.01 كغ لدالة c.

  3. ما هي التوصيات التي خلصت إليها الدراسة لتحسين إنتاجية الأبقار الشامية؟

    أوصت الدراسة بضرورة تطبيق برنامج تحسين وراثي طويل الأمد لانتخاب قطيع نواة عالي الإنتاج من الأبقار الشامية.

  4. هل كان لفصل الولادة تأثير معنوي على معالم منحنى إنتاج الحليب؟

    لم يكن لفصل الولادة تأثير معنوي على أي من معالم منحنى إنتاج الحليب.


References used
Abubakr, B., A. H. Mansour, E. S. E. Galal and Z. Sultan.1998. A genetic study on the lactation curve in Friesian cattle. The 10th conference of the Egyptian society of animal production, Egypt. J. Anim. Prod. 35: 665-680
Andersen, F., O. \ster]s, O. Reksen, N. Toft and Y. Gr`hn. 2011. Associations between the time of conception and the shape of the lactation curve in early lactation in Norwegian dairy cattle. Acta Vet. Scand., 53(1): 5
(Atashi, H., M. Mordi Sharbabak and H. Moradi Shahrbabak. 2009. Environmental factors affecting the shape components of the lactation curves in Holstein dairy cattle of Iran. J. Anim. Sci., 21( 5
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