Izvorni znanstveni članak
https://doi.org/10.5513/JCEA01/22.2.3161
Environmental effects, population genetic parameters, breeding value, phenotypic and genetic trend for age at first calving of Limousin cows
Szabolcs BENE
; Department of Animal Sciences, Georgikon Faculty, Szent István University, Deák Ferenc str 16, H-8360 Keszthely, Hungary
Péter J. POLGÁR
; Department of Animal Sciences, Georgikon Faculty, Szent István University, Deák Ferenc str 16, H-8360 Keszthely, Hungary
Márton SZŰCS
; Association of Hungarian Limousin and Blonde d’Aquitaine Breeders, Lőportár str. 16, H-1134 Budapest, Hungary
Judit MÁRTON
; Hungarian Hereford, Angus and Galloway Breeders Association, Dénesmajor 2, H-7400 Kaposvár, Hungary
Eszter SZABÓ
; University of Szeged, Juhász Gyula Faculty of Education, Boldogasszony sgt 6, H-6725 Szeged, Hungary
Ferenc SZABÓ
; Department of Animal Sciences, Faculty of Agricultural and Food Sciences, Széchenyi István University, Vár place 2, H-9200 Mosonmagyaróvár, Hungary
Sažetak
Some environmental effects, population genetic parameters, breeding value of Limousin breeding bulls, also phenotypic and genetic trends in the age at first calving (AFC) of cows between 1992 and 2013 were estimated. Data were served by the Limousin and Blonde d’Aquitaine Breeders Association, in Hungary. The study was extended to three herds and 1157 cows. GLM method was used for the study of different effects, the BLUP animal model for estimation of population genetic parameters and breeding values (BV), and one-way linear regression analysis for trend calculations. The overall mean value of the AFC was estimated to be 34.7±0.4 months. The contribution of the evaluated factors to the phenotype was as follows: herd 73.51%, birth year of cow 13.02%, sire 6.74%, birth season of cow 1.62%. The heritability of AFC proved to be low (h2 = 0.08±0.07 and h2 = 0.01±0.04). There were relatively small differences in the estimated BV of the studied sires for the AFC. Based on the phenotypic trend calculation, the AFC of cows decreased by an average of 0.33 months per year, however no significant change was found in the genetic trend during the study period.
Ključne riječi
age at first calving; Limousin; population genetic parameters; breeding value; trend
Hrčak ID:
259466
URI
Datum izdavanja:
29.6.2021.
Posjeta: 603 *