[en] The aims of this study were to estimate genetic parameters and to identify genomic regions associated with eating time (EAT) and rumination time (RUT) in Holstein dairy cows. Genetic correlations among EAT, RUT and milk yield traits were also estimated. The data were collected from 2019 to 2022 in 6 dairy herds located in the Walloon Region of Belgium. The data set consisted of daily EAT and RUT records on 284 Holstein cows, from which 41 cows had records only for the first parity, 101 cows had both first and second parities records, and 142 cows had records only for the second parity. The number of daily EAT and RUT records in the first-parity (P1) and second-parity (P2) cows were 18,569 (on 142 cows) and 34,464 (on 243 cows), respectively. Data on 28,994 single nucleotide polymorphisms (SNP) located on 29 Bos taurus autosomes (BTA) of 747 animals (435 males) were used. Random regression test-day models were used to estimate genetic parameters through the Bayesian Gibbs sampling method. The SNP solutions were estimated using a single-step genomic best linear unbiased prediction approach. The proportion of genetic variance explained by each 20-SNP sliding window (with an average size of 1.52 Mb) was calculated, and regions accounting for at least 1.0% of the total additive genetic variance were used to search for candidate genes. Mean (standard deviation (SD)) averaged daily EAT and RUT were 327.0 (85.66) and 559.4 (77.69) min/d for cows in P1 and 316.0 (82.24) and 574.2 (75.42) min/d for cows in P2, respectively. Means (standard deviation; SD) heritability (h2) estimates for daily EAT and RUT were 0.42 (0.09) and 0.45 (0.06) for cows in P1 and 0.45 (0.04) and 0.43 (0.02) for cows in P2, respectively. Mean (SD) daily genetic correlations between daily EAT and RUT were 0.27 (0.07) for P1 and 0.34 (0.08) for P2. Genome-wide association analyses identified 6 genomic regions distributed over 5 chromosomes (BTA1, BTA4, BTA11, BTA14 (2 regions), and BTA17) associated with EAT or RUT. The findings of this study increase our preliminary understanding of the genetic background of feeding behavior in dairy cows; however, larger data sets are needed to determine whether EAT and RUT might have the potential to be used in selection programs.
Disciplines :
Animal production & animal husbandry
Author, co-author :
Atashi, Hadi ; Université de Liège - ULiège > Département GxABT > Animal Sciences (AS)
Pauline, Lemal; TERRA Teaching and Research Center, Gembloux Agro-Bio Tech, University of Liège, 5030 Gembloux, Belgium
Tran, Marie-Nguyet; Elevéo asbl by awé groupe, 5590 Ciney, Belgium
Gengler, Nicolas ; Université de Liège - ULiège > TERRA Research Centre > Animal Sciences (AS)
Language :
English
Title :
Estimation of genetic parameters and single-step genome-wide association studies for eating time and rumination time in Holstein dairy cows.
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