Genome-wide association study for natural antibodies in colostrum of Swedish dairy cattle

Juan Cordero Solorzano, J.J. Wensman, M. Tråvén, J.A.J. Arts, H.K. Parmentier, H. Bovenhuis, D.J. de Koning

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

Colostrum with sufcient antibodies is essential for the newborn calf, as it requires this passive immunity to survive until weaning. High variation in the amount of colostrum antibodies in Swedish dairy cows has been reported, with a large proportion having low antibody levels. Natural antibodies (NAb) are produced without any antigenic stimulation and target self-antigens and pathogen-associated molecular patterns (PAMPs). Our objective was to estimate genetic parameters and detect quantitative trait loci (QTL) for two NAb isotypes (IgG, IgM) in colostrum binding keyhole limpet hemocyanin (KLH) and muramyl dipeptide (MDP). Three experimental farms were included in the study, 1,719 colostrum samples from 1,313 cows between 1 to 6 parities, calving from January 2015 to April 2017 were collected. 70% of the animals were Swedish Red and 30% Swedish Holstein. Antibodies were measured from colostrum using indirect ELISAs. To estimate genetic parameters, a linear mixed model with repeated measures (different calvings from the same cow) was run using ASReml 4, correcting for cow parity number, time from calving to colostrum sampling and breed, including Herd-Year-Season of calving and sample storage plate as random effects. An imputed 50k SNP array from a LD 7K array was used for the Genome-wide association study (GWAS), running the same model but including the SNP genotype as a xed effect. Heritabilities for colostrum NAbs ranged from 0.15 to 0.27, with a permanent environment effect for IgG isotypes accounting for 30% of the variance and for IgM ranging from 15 to 19%. Genetic correlations between IgG and IgM ranged from 0.1 to 0.4. The GWAS revealed one QTL on BTA3 for IgM (KLH and MDP), the latter comprised of 7 SNPs (-log10(p)=4.4), two signicant and ve suggestive, ranging from 80-105 Mbp and another QTL on BTA7 for IgG (KLH and MDP) consisting of 3 SNPs (-log10(p)=4.1), from 85-113 Mbp. Our results suggest that natural antibodies can potentially provide an effective tool to improve colostrum quality using genetic selection.
Original languageEnglish
Title of host publicationBook of abstracts of the 70th Annual Meeting of the European Federation of Animal Science (EAAP)
PublisherWageningen Academic Publishers
Pages448-448
ISBN (Electronic)9789086868902
ISBN (Print)9789086863396
Publication statusPublished - 2019
Event70th Annual Meeting of the European Federation of Animal Science (2019) - Ghent, Belgium
Duration: 26 Aug 201930 Aug 2019
https://www.eaap2019.org/EN/Home/tabid/9594/Default.aspx

Publication series

NameBook of Abstracts
PublisherWageningen Academic Publishers
ISSN (Electronic)1382-6077

Conference

Conference70th Annual Meeting of the European Federation of Animal Science (2019)
Abbreviated titleEAAP 2019
CountryBelgium
CityGhent
Period26/08/1930/08/19
Internet address

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