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Lactation curves for milk yield, fat and protein content in Slovenian dairy sheep

Author

Listed:
  • A. Komprej

    (Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia)

  • G. Gorjanc

    (Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia)

  • D. Kompan

    (Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia)

  • M. Kovač

    (Department of Animal Science, Biotechnical Faculty, University of Ljubljana, Domžale, Slovenia)

Abstract

Lactation curves for daily milk yield, fat, and protein content in three dairy sheep breeds were estimated by the repeatability animal model using test-day records. A total of 38 983 records from 3068 ewes of Bovec, Improved Bovec, and Istrian Pramenka breeds, collected between the years 1994 and 2002, were analysed. The three-trait repeatability animal model included breed and lambing season as fixed. The stage of lactation within each breed was modelled by the modified Ali-Schaeffer's lactation curve. Parity and litter size were used as covariates in quadratic and linear regression, respectively. Common flock environment, additive genetic effect, permanent environment over lactations as well as within lactation were treated as random. The average daily milk yield was 1090 g in Bovec, 1010 g in Improved Bovec, and 731 g in Istrian Pramenka breeds. Overall means for fat and protein content were 6.59 and 5.53% for Bovec, 6.22 and 5.33% for Improved Bovec, and 7.20 and 5.63% for Istrian Pramenka. Breed, lambing season, stage of lactation, parity, and litter size significantly (P < 0.001) affected all three observed milk traits, with the only exception of parity in fat and litter size in protein content. The shape of lactation curves for daily milk yield in Bovec and Improved Bovec breeds fitted well to the general lactation curve in dairy sheep. Daily milk yield was increasing in the first month of lactation and decreasing thereafter. In Istrian Pramenka, the shape of lactation curve was more or less atypical, with daily milk yield decreasing almost throughout the entire lactation. Lactation curves for fat and protein content were opposite to the lactation curves for daily milk yield in all three breeds.

Suggested Citation

  • A. Komprej & G. Gorjanc & D. Kompan & M. Kovač, 2012. "Lactation curves for milk yield, fat and protein content in Slovenian dairy sheep," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 57(5), pages 231-239.
  • Handle: RePEc:caa:jnlcjs:v:57:y:2012:i:5:id:5921-cjas
    DOI: 10.17221/5921-CJAS
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    References listed on IDEAS

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    1. J. Kuchtík & K. Šustová & T. Urban & D. Zapletal, 2008. "Effect of the stage of lactation on milk composition, its properties and the quality of rennet curdling in East Friesian ewes," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 53(2), pages 55-63.
    2. A. Komprej & G. Gorjanc & D. Kompan & M. Kovač, 2009. "Covariance components by a repeatability model in Slovenian dairy sheep using test-day records," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 54(9), pages 426-434.
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