Naslov
The effect of inbreeding on milk production in Czech Holstein cattle

Autori
Curik, Ino ; Vostra-Vydrova, Hana ; Shihabi, Mario ; Sölkner, Johann ; Brzakova, Mihaela ; Pocrnic, Ivan ; Gorjanc, Gregor ; Vostry, Lubos

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts of the International Symposium 30th Animal Science days / - , 2022, 57-57

Skup
30th International Symposium Animal Science Days (ASD 2022)

Mjesto i datum
Zadar, Hrvatska, 21.09.2022. - 23.09.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
dairy cattle ; inbreeding depression ; milk production traits ; pedigree inbreeding coefficient ; runs of homozygosity

Sažetak
Breeding programmes for dairy cows focus on improving milk production traits and are characterised by intensive use of a relatively small number of elite bulls, resulting in higher levels of inbreeding and inbreeding depression. The aim of this study was to evaluate the effect of inbreeding (per 1% increase) on milk (MY), protein (PY) and fat (FY) yield in the Czech population of Holstein cattle. Our Bayesian approach to statistical animal models included 4749 genotyped cows (effectively providing information on > 40, 000 SNPs) with records of milk production in the first lactation. Several different models, depending on pedigree (FPED related to pedigree with complete generation equivalent of 12.5) or ROH-based genomic (ROH>4Mb or ROH>8MB) inbreeding coefficients (covariates), were applied. All values in the high posterior density interval (99%HDI) were negative for the MY estimates, with mean genomic inbreeding depression estimates (expressed per 1% increase in inbreeding coefficient) higher than pedigree estimates, bFROH>4Mb=-30.0 (99%HDI from -36.3 to -23.3) and bFROH>8Mb=-34.4 (99%HDI from -40.5 to -28.2) versus bFPED=-13.2 (99%HDI from -16.8 to -9.6). Negative mean estimates of inbreeding depression were obtained in all models, with only one exception (MY estimates for FROH > 8Mb) with respect to PY (bFPED=-0.8, bFROH>4Mb=-0.9, bFROH>8Mb=-0.9) and FY (bFPED=-0.7, bFROH>4Mb=-0.1, bFROH>8Mb=0.0), although positive estimates were observed even at an HDI of 95%, which could be the consequence of the low statistical power of the analyses performed. Therefore, the presented results should be confirmed using a larger and more informative data set.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija), Interdisciplinarne biotehničke znanosti

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