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Impact of different numbers of milk test-day records during lactation on the reliability of estimated breeding values

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Abstract

The objective of this study was to evaluate the impact of the reduction in the number of test-day records per lactation on genetic parameters of test-day milk yield (TDMY) and the reliability of estimated breeding values for 305-day milk yield in Holstein cattle. Estimates of genetic parameters and breeding values were performed using the animal model of random regression and adjustment of the Legendre polynomial (fourth order). When comparing sires with the same number of daughters, greater reliability was found in the subpopulations with the highest number of milk test-day records per lactation per cow. It was also found that the elimination of at least one test-day record affected the reliability of estimated breeding value for 305-day milk yield in the sires, regardless of the class of number of daughters per sire. When selecting the 5% best sires and 20% best cows, the lowest order correlations were observed between the population with 10 test-day records per lactation (complete lactation) and the other subpopulations with incomplete lactations (4, 5, 6, 7, 8, 9 test-day records per lactation). The reduction in the number of test-day milk records per lactation interferes in the reliability of the estimated breeding value for sires and cows, negatively impacting the precision of selecting genetically superior animals.

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Data availability

The datasets analyzed during the current study are not publicly available due to the data provider’s request.

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Funding

This study was supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES; Finance Code 001) – Brasil.

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Authors and Affiliations

  1. Department of Animal Science, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil

    Giovani Luis Feltes, Vanessa Tomazetti Michelotti, Mauricio Morgado Oliveira, Fernanda Cristina Breda & Paulo Roberto Nogara Rorato

  2. Department of Animal Science, Federal University of Rio Grande do Sul, Porto Alegre, 91540-000, Brazil

    Renata Negri, Alessandro Haiduck Padilha & Jaime Araújo Cobuci

Authors
  1. Giovani Luis Feltes
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  2. Vanessa Tomazetti Michelotti
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  3. Mauricio Morgado Oliveira
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  4. Fernanda Cristina Breda
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  5. Paulo Roberto Nogara Rorato
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  6. Renata Negri
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  7. Alessandro Haiduck Padilha
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  8. Jaime Araújo Cobuci
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Contributions

GLF, FCB, PRNR, and JAC conceived and designed research. GLF, VTM, FCB, and MMO conducted analyzed data. GLF, FCB, PRNR, RN, and JAC wrote the manuscript. All authors read and approved the manuscript.

Corresponding authors

Correspondence to Giovani Luis Feltes or Fernanda Cristina Breda.

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Ethics approval

This is an observational study. The Federal University of Santa Maria—UFSM Research Ethics Committee has confirmed that no ethical approval is required.

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Informed consent was obtained from all individual participants included in the study.

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The authors declare no competing interests.

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Feltes, G.L., Michelotti, V.T., Oliveira, M.M. et al. Impact of different numbers of milk test-day records during lactation on the reliability of estimated breeding values. Trop Anim Health Prod 54, 301 (2022). https://doi.org/10.1007/s11250-022-03288-3

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