Genetic and Phenotypic Association between Productive and Reproductive Traits in Friesian Cows In Egypt
Zahed, S., Badr, A., Khattab, A. (2020). Genetic and Phenotypic Association between Productive and Reproductive Traits in Friesian Cows In Egypt. EKB Journal Management System, 11(3), 83-88. doi: 10.21608/jappmu.2020.87123
S. M. Zahed; Anas A. A. Badr; A. S. Khattab. "Genetic and Phenotypic Association between Productive and Reproductive Traits in Friesian Cows In Egypt". EKB Journal Management System, 11, 3, 2020, 83-88. doi: 10.21608/jappmu.2020.87123
Zahed, S., Badr, A., Khattab, A. (2020). 'Genetic and Phenotypic Association between Productive and Reproductive Traits in Friesian Cows In Egypt', EKB Journal Management System, 11(3), pp. 83-88. doi: 10.21608/jappmu.2020.87123
Zahed, S., Badr, A., Khattab, A. Genetic and Phenotypic Association between Productive and Reproductive Traits in Friesian Cows In Egypt. EKB Journal Management System, 2020; 11(3): 83-88. doi: 10.21608/jappmu.2020.87123

Genetic and Phenotypic Association between Productive and Reproductive Traits in Friesian Cows In Egypt

Journal of Animal and Poultry Production
Article 4, Volume 11, Issue 3, March 2020, Pages 83-88    PDF (494.37 K)
Document Type: Original Article
DOI: 10.21608/jappmu.2020.87123
Authors
S. M. Zahed* 1; Anas A. A. Badr2; A. S. Khattab3
1Animal Production Research Institute, Ministry of Agriculture and Land Reclamation, Nadi El-Said Str., Dokki, Giza, Egypt
2Animal Production Res. Inst., Ministry of Agric., Dokki, Giza, Egypt
3Animal production Dept., Faculty of Agric., Tanta University.
Abstract
Genetic parameters for Friesian cows were estimated from 9155 lactation records for 3625 cows sired by 182 bulls covered 34 years (1982-2015) in two herds (Sakha and El-Karada),  belongs to the Animal Production Research Institute, Ministry of Agriculture, Egypt. Multi-trait repeated animal model was employed using the REML procedure to estimate (co)variance components of productive (305-day milk yield-M305 and lactation period-LP) and reproductive traits (number of services per conception-NSC, calving to first service interval-CFS and days open-DO), There is sufficient genetic variation in productive (from 9.5 to 17.1%) and reproductive traits (from 3.9 to 10.3 %). Heritability estimates for M305 and LP traits were 0.204 and 0.110, however, reproduction traits were ranged from 0.010 to 0.044. Genetic correlation between M305 and LP was high (>0.94). Among reproductive traits, absolute genetic correlations were also high (>0.85). Genetic correlations between reproductive and productive traits were  high (>0.99). The annual genetic changes were positive for M305, LP, CFS and DO (9.07 kg/yr., 0.30, 0.07 and 0.24 d/yr., respectively), however it was -0.003 number/yr for NSC. The annual phenotypic changes were positive for M305, CFS and DO (12.4 kg/yr., 0.029 and 0.829d/yr., respectively), however it were negative for LP and NSC (-0.265 d/yr. and -0.002 number /yr.).
Keywords
Genetic; Phenotypic trend; Reproduction; Production
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