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Genetic parameters for noncoagulating milk, milk coagulation properties, and detailed milk composition in Swedish Red Dairy Cattle

Duchemin, S. I. ; Nilsson, K. LU ; Fikse, W. F. ; Stålhammar, H. ; Buhelt Johansen, L. ; Stenholdt Hansen, M. ; Lindmark-Månsson, H. LU ; de Koning, D. J. ; Paulsson, M. LU and Glantz, M. LU (2020) In Journal of Dairy Science 103(9). p.8330-8342
Abstract

The rennet-induced coagulation ability of milk is important in cheese production. For Swedish Red Dairy Cattle (RDC), this ability is reduced because of a high prevalence of noncoagulating (NC) milk. In this study, we simultaneously combined genetic parameters for NC milk, milk coagulation properties, milk composition, physical traits, and milk protein composition. Our aim was to estimate heritability and genetic and phenotypic correlations for NC milk and 24 traits (milk coagulation properties, milk composition, physical traits, and milk protein composition). Phenotypes and ~7,000 SNP genotypes were available for all 600 Swedish RDC. The genotypes were imputed from ~7,000 SNP to 50,000 SNP. Variance components and genetic parameters... (More)

The rennet-induced coagulation ability of milk is important in cheese production. For Swedish Red Dairy Cattle (RDC), this ability is reduced because of a high prevalence of noncoagulating (NC) milk. In this study, we simultaneously combined genetic parameters for NC milk, milk coagulation properties, milk composition, physical traits, and milk protein composition. Our aim was to estimate heritability and genetic and phenotypic correlations for NC milk and 24 traits (milk coagulation properties, milk composition, physical traits, and milk protein composition). Phenotypes and ~7,000 SNP genotypes were available for all 600 Swedish RDC. The genotypes were imputed from ~7,000 SNP to 50,000 SNP. Variance components and genetic parameters were estimated with an animal model. In Swedish RDC, a moderate heritability estimate of 0.28 was found for NC milk. For the other 24 traits, heritability estimates ranged from 0.12 to 0.77 (standard errors from 0.08 to 0.18). A total of 300 phenotypic and genetic correlations were estimated. For phenotypic and genetic correlations, 172 and 95 were significant, respectively. In general, most traits showing significant genetic correlations also showed significant phenotypic correlations. In this study, phenotypic and genetic correlations with NC milk suggest that many correlations between traits exist, making it difficult to predict the real consequences on the composition of milk, if selective breeding is applied on NC milk. We speculate that some of these consequences may lead to changes in the composition of milk, most likely affecting its physical and organoleptic properties. However, our results suggest that κ-casein could be used as an indicator trait to predict the occurrence of NC milk at the herd level.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
genetic correlation, genetic parameter, heritability, milk coagulation, noncoagulating milk
in
Journal of Dairy Science
volume
103
issue
9
pages
13 pages
publisher
American Dairy Science Association
external identifiers
  • scopus:85087018150
  • pmid:32600755
ISSN
0022-0302
DOI
10.3168/jds.2020-18315
language
English
LU publication?
yes
id
fa0f095a-7a6f-47b7-926e-b5956cc87a95
date added to LUP
2020-07-13 13:34:38
date last changed
2021-01-06 01:31:15
@article{fa0f095a-7a6f-47b7-926e-b5956cc87a95,
  abstract     = {<p>The rennet-induced coagulation ability of milk is important in cheese production. For Swedish Red Dairy Cattle (RDC), this ability is reduced because of a high prevalence of noncoagulating (NC) milk. In this study, we simultaneously combined genetic parameters for NC milk, milk coagulation properties, milk composition, physical traits, and milk protein composition. Our aim was to estimate heritability and genetic and phenotypic correlations for NC milk and 24 traits (milk coagulation properties, milk composition, physical traits, and milk protein composition). Phenotypes and ~7,000 SNP genotypes were available for all 600 Swedish RDC. The genotypes were imputed from ~7,000 SNP to 50,000 SNP. Variance components and genetic parameters were estimated with an animal model. In Swedish RDC, a moderate heritability estimate of 0.28 was found for NC milk. For the other 24 traits, heritability estimates ranged from 0.12 to 0.77 (standard errors from 0.08 to 0.18). A total of 300 phenotypic and genetic correlations were estimated. For phenotypic and genetic correlations, 172 and 95 were significant, respectively. In general, most traits showing significant genetic correlations also showed significant phenotypic correlations. In this study, phenotypic and genetic correlations with NC milk suggest that many correlations between traits exist, making it difficult to predict the real consequences on the composition of milk, if selective breeding is applied on NC milk. We speculate that some of these consequences may lead to changes in the composition of milk, most likely affecting its physical and organoleptic properties. However, our results suggest that κ-casein could be used as an indicator trait to predict the occurrence of NC milk at the herd level.</p>},
  author       = {Duchemin, S. I. and Nilsson, K. and Fikse, W. F. and Stålhammar, H. and Buhelt Johansen, L. and Stenholdt Hansen, M. and Lindmark-Månsson, H. and de Koning, D. J. and Paulsson, M. and Glantz, M.},
  issn         = {0022-0302},
  language     = {eng},
  month        = {09},
  number       = {9},
  pages        = {8330--8342},
  publisher    = {American Dairy Science Association},
  series       = {Journal of Dairy Science},
  title        = {Genetic parameters for noncoagulating milk, milk coagulation properties, and detailed milk composition in Swedish Red Dairy Cattle},
  url          = {http://dx.doi.org/10.3168/jds.2020-18315},
  doi          = {10.3168/jds.2020-18315},
  volume       = {103},
  year         = {2020},
}