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Genetic analyses of productive, reproductive and productive-efficiency traits in different lactations of Fleckvieh cattle in Austria [electronic resource] : 1- heritability and repeatability.

By:

Soliman, A. M

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Language: English Summary language: Arabic Description: p.15-29Other title:

التحليل الوراثى لصفات الكفاءة الإنتاجية والتناسلية فى المواسم المختلفة فى ماشية الفلاك :‏ ‏1- العمق الوراثى والمعامل التكرارى [Added title page title]

Uniform titles:

Egyptian journal of animal production, 2001 v. 38 (1) [electronic resource].

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In: Egyptian journal of animal production 2001.v.38(1)Summary: 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 vield (MY), total fat yield (FY), total protein vield (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 (MYDIM). milk yield per day of calving interval (MYCI), 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.

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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 vield (MY), total fat yield (FY), total protein vield (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 (MYDIM). milk yield per day of calving interval (MYCI), 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.

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