Effect of daily weight gain on age at first calving and subsequent milk yield of Holstein heifers in Egypt
العناوين الأخرى
تأثير الزيادة اليومية في وزن الجسم على العمر عند أول ولادة وإنتاج اللبن المستقبلي لعجلات الهولشتين في مصر
المؤلفون المشاركون
Samul, Ali Mustafa
Sadiq, Rabi Rajab
Hasan, Jamal Ashur
Ibrahim, Muhammad Abd al-Aziz Muhammad
المصدر
Egyptian Journal of Animal Production
العدد
المجلد 51، العدد 3 (30 سبتمبر/أيلول 2014)، ص ص. 164-171، 8ص.
الناشر
الجمعية المصرية للإنتاج الحيواني
تاريخ النشر
2014-09-30
دولة النشر
مصر
عدد الصفحات
8
التخصصات الرئيسية
الموضوعات
الملخص EN
A total number of 1152 complete lactation records for 576 Holstein cows were collected from two commercial farms (Copenhagen and Sami Asaad farm) during the period from year 2007 to 2010 to determine the effect of average daily weight gain (ADG) from birth to conception of Holstein heifers on their age at first calving (AFC) and subsequent milk yield.
Heifers were divided into four groups (G, s) based on their ADG as 650 g / day, 775 g / day, 875 g/day and 950 g/day for G1, G2, G3 and G4, respectively.
Heifers of G4 reached the AFC 5.
3 month earlier (P < 0.
001) than those of G1.
ADG had positive effect on productive traits of the first two lactations.
Cows of G4 had a similar 305 days milk yield in the first lactation compared to G1 but, scored non-significant higher milk yield in the second one by 535 kg.
G4 had non-significant increase in milk yield / day of cow age till the end of the first lactation (MY1 / DCA) compared with G1.
Milk yield / day of cow age of G4 till the end of the second lactation (MY2 / DCA) increased (P < 0.
01) by 12.
7 % compared to G1.
Days open of G4 in the first lactation (DO1) was shorter (P < 0.
05) than that of G1 by 44 days.
This trend extended to the second lactation, however, it was insignificant.
The present results showed that productive and reproductive performance of the faster growing Holstein heifers is better than that of slower ones.
The ADG of Holstein heifers during the period from birth to conception affected significantly AFC, DO1 and MY2/DCA.
G4 calved for the first time 5.
3 months earlier, produced 535 kg more milk and had shorter days open by 67 days till the end of second lactation compared with G1.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Sadiq, Rabi Rajab& Hasan, Jamal Ashur& Ibrahim, Muhammad Abd al-Aziz Muhammad& Samul, Ali Mustafa. 2014. Effect of daily weight gain on age at first calving and subsequent milk yield of Holstein heifers in Egypt. Egyptian Journal of Animal Production،Vol. 51, no. 3, pp.164-171.
https://search.emarefa.net/detail/BIM-563108
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Sadiq, Rabi Rajab…[et al.]. Effect of daily weight gain on age at first calving and subsequent milk yield of Holstein heifers in Egypt. Egyptian Journal of Animal Production Vol. 51, no. 3 (Sep. 2014), pp.164-171.
https://search.emarefa.net/detail/BIM-563108
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Sadiq, Rabi Rajab& Hasan, Jamal Ashur& Ibrahim, Muhammad Abd al-Aziz Muhammad& Samul, Ali Mustafa. Effect of daily weight gain on age at first calving and subsequent milk yield of Holstein heifers in Egypt. Egyptian Journal of Animal Production. 2014. Vol. 51, no. 3, pp.164-171.
https://search.emarefa.net/detail/BIM-563108
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references : p. 169-170
رقم السجل
BIM-563108
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر