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Genetic parameters of first lactation Traitsof Holstein cows in Egypt
العناوين الأخرى
المعايير الوراثية لصفات موسم الحليب الأول لأبقار الهولشتين في مصر
المؤلفون المشاركون
Hammud, Muhammad Hasan
Salim, Muhammad Mahmud Ibrahim
المصدر
Egyptian Journal of Animal Production
العدد
المجلد 53، العدد 2 (31 مايو/أيار 2016)، ص ص. 75-80، 6ص.
الناشر
الجمعية المصرية للإنتاج الحيواني
تاريخ النشر
2016-05-31
دولة النشر
مصر
عدد الصفحات
6
التخصصات الرئيسية
الملخص EN
Data relevant to 732Holstein cows raised at El-yoser private farm, 51kmsouth east Alexandria, between 1995-2005were utilized to estimate the genetic parameters of first lactation total milk yield (TMY), 305-day milk yield (305-DMY), peak yield (PY),lactation period (LP), age at first calving (AFC), first service period (FSP), days open (DO) and number of services per conception (NSC).
Also, the effects of season and year of calving and age at first calving on first lactation traits were studied.
The least squares analysis indicated that the overall least squares means of TMY, 305-DMY,PY,LP,AFC, FSP, DO and NSC were 9776 kg, 8237 kg, 37.2 kg, 365.7 day,27.1 month, 95.8 day, 114.0 day and 1.9 services, respectively.
Season of calving had significant effect (P < 0.01) on PY, LP, AFC, DO and NSC, but had no significant effect on TMY, 305-DMY and FSP.
Year of calving had significant influence (P < 0.01) on all studied traits except DO which was not significantly influenced.
Age at first calving had significant effect (P<0.01) on TMY and 305-DMY, but had nosignificant effect on PY, LP, FSP, DO and NSC.
The heritability estimatesfrom univariate animal models were 0.219, 0.228, 0.150, and 0.093,0.
264, 0.091, 0.186and0.00001for TMY, 305-DMY, PY,LP, AFC, FSP, DO and NSC, respectively.The genetic corrletions estimated from bivariate animal modelswere positive ranging from 0.114 to 0.999,except those between 305-DMY andAFC, between PY andFSP and between FSP and DO withNSCwere negative (-0.034,-0.260,-0.761and -0.086, respectively).All correlations among all traits were highly significant except those between 305-DMY andAFC and betwen DO and NSC which were not significant.The positive genetic correlations between PY and each of 305-DMY and TMY indicate that selection for high PY will produce associated genetic improvement in both 305-DMY and TMY.
Phenotypic correlations among all traits were positive ranging from 0.010 to 0.998except for that between FSP and NSC, which was negative (-0.172).Most of correlations were highly significant.
The results indicate the possibility of using program to improve first lactation performance of Holstein cows through selection.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Salim, Muhammad Mahmud Ibrahim& Hammud, Muhammad Hasan. 2016. Genetic parameters of first lactation Traitsof Holstein cows in Egypt. Egyptian Journal of Animal Production،Vol. 53, no. 2, pp.75-80.
https://search.emarefa.net/detail/BIM-911210
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Salim, Muhammad Mahmud Ibrahim& Hammud, Muhammad Hasan. Genetic parameters of first lactation Traitsof Holstein cows in Egypt. Egyptian Journal of Animal Production Vol. 53, no. 2 (May. 2016), pp.75-80.
https://search.emarefa.net/detail/BIM-911210
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Salim, Muhammad Mahmud Ibrahim& Hammud, Muhammad Hasan. Genetic parameters of first lactation Traitsof Holstein cows in Egypt. Egyptian Journal of Animal Production. 2016. Vol. 53, no. 2, pp.75-80.
https://search.emarefa.net/detail/BIM-911210
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references : p. 79-80
رقم السجل
BIM-911210
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
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