| Titles |
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English :
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Genetic analyses of productive, reproductive and productive-efficiency traits in different lactations of fleckvieh cattle in Austria 1- heritabillity and repeatability
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Arabic :
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التحليل الوراثى لصفات الكفاءة الانتاجية و التناسلية في المواسم المختلفة في ماشية الفلاك في 1- العمق الوراثى و المعامل التكرارى
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| Abstract |
A Total of 58050 productive and reproductive performance records covering the first four lactations of Austrian Fleckvieh cows raised in Austria were used to analyze the performance of each individual lactation, while a total of 28316 records representing 10007 cows sired by 643 bulls extracted from 58050 records were used for the analysis across all lactations. Estimates of genetic and phenotypic variations were obtained for the first four lactations and across all lactations. Traits studied were: total milk yield (MY). Total fat yield (FY), total protein yield (PY) and days in milk (DIM) as total milk yield traits (MYT); age at calving (AC), and calving interval (Cl) as reproductive traits (RT); milk yield per day of days in milk (MYD1M). milk yield per day of calving intenJal (MYCl). milk yield per day of age at first and second calving (MY AFC and MY ASC), respectively as productive efficiency traits (PET).
Heritability (h2s) estimates through the first four and across all lactations, respectively ranged from 0.06 to 0.19 for MYT and 0.20 to 0.22 and decreased with advance of parity. For RT, estimates of h2s ranged from 0.40 to 0.55 for AC; from 0.03 to 0.06 and 0.03 for C1. For PET. the ranges and estimates were from 0.02 to 0.24 and 0.23 for MYD1M; from 0.05 to 0.14 and 0.27 for MYCl; from 0.10 to 0.39 and 0.18 for MY AFC and from 0.11 to 0.36 and 0.21 for MYASC. Coefficients of additive genetic and phenotypic variation (CAV% and CPV%) through the first four alld across all lactations respectively ranged from 4.0 to 8.4% and 15.6 to 18.3% for MYT, from 2.8 to 8.7% alld 8.6 to 16.6% for RT; from 0.9 to 34.1% and 1.9 to 54.3% for PET. In general, it is desirable to take some PET (MY AFC in the first lactation alld MY ASC in the second lactation) as selection criteria, because they recorded the highest estimates of h2s and CAV%.
Repeatability estimates for MYT were moderate or slightly high ranging from 0.41 to 0.45. The estimates were 0.17 for both DIM and C1, andfonn 0.43 to 0.49 for PET.
Keywords: Fleckvieh cattle, productive efficiency, heritability, repeatability, coefficients of additive genetic and phenotypic variation
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| Publication year |
2001
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| Pages |
15-29
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة
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| Availability number |
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| Organization Name |
Animal Production Research Institute (APRI)
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| serial title |
Egyptian Journal of Animal Production
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| ISSN |
0302-4520
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| Author(s) from ARC |
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| External authors (outside ARC) |
اشرف محمد سليمان
جامعة الزقازيق
محمدعبد الرحمن مصطفى
جامعة الزقازيق
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| Agris Categories |
Animal husbandry
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AGROVOC
TERMS |
Genetic variation.
Heritability.
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| Proposed Agrovoc |
phenotypic variation;Fleckvieh cattle;productive efficiency;repeatability;
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| Publication Type |
Journal
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