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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