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Register a new userدراسات تربوية لمقاييس الضرع ودلايل صحته عند أبقار الفريزيان
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جامعة الفرات أطروحة دكتوراه
Publication date
2010
fields
Agricultural Engineering
and research's language is
العربية
Created by
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تتبوأ الأبقار المرتبة الاولى في إنتاج الحليب بين الحيوانات الزراعية كونها تنتج ما يعادل 58.4% من مجمل إنتاج الحليب
No English abstract
References used
GTZ(2003) Gesellschaft fur TechnischeZusammenarbeit
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Records of ٤٤٥ Friesian cows were analysed for calving interval and its
components; days open, lactation length and length of dry period. The model
included parity, calving year and calving season. The overall means were
٤٢٥,٧٧ ± ١,٨٩, ١٤١,٣ ± ١,٣
٧, ٣٥٣,٩ ± ٠,٨٨ and ٧٣,٠٢ ± ٠,٧٧ days for calving
interval, days open, lactation length and length of the dry period respectively.
These estimates are high by tropical and subtopical standards, but they remain
lower than the reproductive performance of Friesian cattle in temperate
countries.
This study was conducted to estimate the losses due to mastitis in Fedio
Station –Syria, by using a direct microscopic method to determine the
somatic cell count in bulk tank milk. About 52 milk bulk tank samples
were examined weekly in one year.
أدى استخدام عرق الهولشتاين فريزيان بشكل واسع في أعمال الخلط التربوي و الإنتاجي مع تحسين
العوامل البيئية إلى تحسين إنتاجية الأبقار من الحليب، إلا إنه قد سجل مع هذا التطور في إنتاج الحليـب
ازدياد في حالات أمراض التهاب الضرع Mastitis ، و قد أشارت المر
اجع العلمية في هذا السياق إلـى أن
الإصابة بأمراض التهاب الضرع يزداد احتماله مع ارتفاع إنتاجية الأبقـار مـن الحليـب، كمـا سـجلت اختلافات بين سلالات أو عروق الحليب بالنسبة لهذا المرض.
This study was done on the records of 564 milk cows
during the period 2004-2007 .Those cows were dismissed
for many reasons and in different ages. The range of
dismissing age is between 3-6 years. The ratio of
dismissing of those cows was between
20-25% . The rate
of dismissing was high in the first lactation season . It
reached 27,43% for the years 2004-2005, and 24,45% for
the years 2006-2007. The highest percentage of dismissing
was in the first month of milk seasons .It reached 34,49%
in the years 2006-2007.
This study was conducted to investigate of the subclinical mastitis
in dairy cows by using California Mastitis Test (CMT) and
microbial cultuer of positive California Mastitis Test milk sample .
880 quarter milk samples of 220 healthy cows were te
sted using ()
followed by bacteriological examination to identify the major
causative agents of intramammary infection.
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