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Genetic parameters for age at first calving and lifetime milk yield traits in friesian cattle in Egypt [electronic resource].

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Ghoneim, Elham

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Language: English Summary language: Arabic Description: p.913-923Other title:

المعايير الوراثية لصفة العمر عند ولادة وصفات انتاج اللبن طوال الحياة الانتاجية لماشية الفريزيان في مصر.‪ [Added title page title]

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Minufiya journal of agricultural research, 2011 v. 36 (4) [electronic resource].

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In: Minufiya Journal of Agricultural Research 2011. v.36(4)Summary: The main objective of the present study was estimating the genetic parameters and breeding values for studied traits. The study was carried out in two farms (Sakha and EIKarada) in Kafr-Elshikh governorate which belong to Animal Production Research Institute - Agriculture research center - Agriculture Ministry. Data covered the period of 27 years from 1981 to 2008 (2940 records, 853 lactating Friesian cows, 104 sires and 689 dams). The studied traits were; age at first calving (AFC), lifetime milk yield traits [Total milk yield{TMYJ, Total 305 day milk yield (T305), and Total lactation period (TLPJ). Fixed effects of farm, year and season of calving on these traits were studied. The overall means of those traits were 35.58 month, 9888 kg, 8750 kg, and 1091 day, respectively. Fixed Effects were signfflcant on four traits except season of calving. Heritability estimates for AFC, TMY, T305, and TLP were 0.26, 0.29, 0.22 and 0.19, respectively. Genetic and phenotypic co"e/ations were positive among studied traits, except AFC with Iffe milk yield traits. Range of predicted breeding values for previous traits were from -10.1 to 13.5 month for AFC, -2077 to 4828 kg for TMY, from -1978 to 4228 kg for T305 and -200 to 424 day for TLP respectively. Key words:- (genetic parameters - age at first calving- liffetime milk yield traits- Friesian cattle)

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The main objective of the present study was estimating the genetic parameters and breeding values for studied traits. The study was carried out in two farms (Sakha and EIKarada) in Kafr-Elshikh governorate which belong to Animal Production Research Institute - Agriculture research center - Agriculture Ministry. Data covered the period of 27 years from 1981 to 2008 (2940 records, 853 lactating Friesian cows, 104 sires and 689 dams). The studied traits were; age at first calving (AFC), lifetime milk yield traits [Total milk yield{TMYJ, Total 305 day milk yield (T305), and Total lactation period (TLPJ). Fixed effects of farm, year and season of calving on these traits were studied. The overall means of those traits were 35.58 month, 9888 kg, 8750 kg, and 1091 day, respectively. Fixed Effects were signfflcant on four traits except season of calving. Heritability estimates for AFC, TMY, T305, and TLP were 0.26, 0.29, 0.22 and 0.19, respectively. Genetic and phenotypic co"e/ations were positive among studied traits, except AFC with Iffe milk yield traits. Range of predicted breeding values for previous traits were from -10.1 to 13.5 month for AFC, -2077 to 4828 kg for TMY, from -1978 to 4228 kg for T305 and -200 to 424 day for TLP respectively. Key words:- (genetic parameters - age at first calving- liffetime milk yield traits- Friesian cattle)

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