El-Awady, H., Badr, A., Khattab, A., Oudah, E. (2020). Genetic Components for Milk Production and it is Composition Estimated by Using Sire and Animal Models in A Herd of Friesian Cows. Journal of Animal and Poultry Production, 11(3), 79-82. doi: 10.21608/jappmu.2020.87120
H. G. El-Awady; Anas A. Badr; A. S. Khattab; E. Z. Oudah. "Genetic Components for Milk Production and it is Composition Estimated by Using Sire and Animal Models in A Herd of Friesian Cows". Journal of Animal and Poultry Production, 11, 3, 2020, 79-82. doi: 10.21608/jappmu.2020.87120
El-Awady, H., Badr, A., Khattab, A., Oudah, E. (2020). 'Genetic Components for Milk Production and it is Composition Estimated by Using Sire and Animal Models in A Herd of Friesian Cows', Journal of Animal and Poultry Production, 11(3), pp. 79-82. doi: 10.21608/jappmu.2020.87120
El-Awady, H., Badr, A., Khattab, A., Oudah, E. Genetic Components for Milk Production and it is Composition Estimated by Using Sire and Animal Models in A Herd of Friesian Cows. Journal of Animal and Poultry Production, 2020; 11(3): 79-82. doi: 10.21608/jappmu.2020.87120
Genetic Components for Milk Production and it is Composition Estimated by Using Sire and Animal Models in A Herd of Friesian Cows
1Animal Production Dept., Fac. of Agriculture, Kafrelsheikh University
2Animal Production Res. Inst., Ministry of Agric., Dokki, Giza, Egypt
3Animal Production Dept., Faculty of Agric., Tanta University.
4Animal Production Dept., Faculty of Agriculture, Mansoura University.
Abstract
A total number of eighty seventy four Friesian cows which, kept at Sakha and El–Karda farms, from 1996 to 2002 are used to estimate heritability (h2) , phenotypic (rp) and genetic correlations (rg) among three months and 305 day milk yield traits by using sire model (SM) and animal model (AM). The SM includes the random effects of bull and cows within bulls and main effects of herd year season, and lactation number and days open as a regression. The animal model includes the main effects of herd year season and lactation number and days open as a regression and random effects of animals, permanent and errors.Estimates of h2 of milk yield traits for sire models are moderate and between from f0.116 to 0.264 as calculated from sire components and from 0.036 to 0.068 from dam components, while the h2 for milk traits from AM ranged from 0.046 to 0.062. Genetic correlations between milk production traits are positive, high and near similar for SM and AM and between from 0.88 to 0.99. The high estimates of genetic correlation in the present study offer the possibility to select for yield traits as early ages, .i.e., at 90 days of lactation. Also, this study indicate that, using of SM is useful when a, small number of observations and little pedigree information is available.
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