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Factors affecting ewe's milk fat and protein content and relationships between milk yield and milk components

Author

Listed:
  • M. Oravcová

    (Slovak Agricultural Research Centre, Research Institute of Animal Production, Nitra, Slovak Republic)

  • M. Margetín

    (Slovak Agricultural Research Centre, Research Institute of Animal Production, Nitra, Slovak Republic)

  • D. Peškovičová

    (Slovak Agricultural Research Centre, Research Institute of Animal Production, Nitra, Slovak Republic)

  • J. Daňo

    (Slovak Agricultural Research Centre, Research Institute of Animal Production, Nitra, Slovak Republic)

  • M. Milerski

    (Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • L. Hetényi

    (Slovak Agricultural Research Centre, Research Institute of Animal Production, Nitra, Slovak Republic)

  • P. Polák

    (Slovak Agricultural Research Centre, Research Institute of Animal Production, Nitra, Slovak Republic)

Abstract

Test-day records of purebred Tsigai, Improved Valachian and Lacaune ewes were used to analyse the effect of environmental factors on milk fat and protein content. There were 121 424 and 121 158 measurements of fat and protein content for Tsigai, 247 742 and 247 606 measurements of fat and protein content for Improved Valachian and 2 194 measurements of fat and protein content for Lacaune ewes lambing between 1995 and 2005. Overall means and standard deviations for fat and protein content were 7.77 ± 1.606% and 5.94 ± 0.690% for Tsigai, 7.48 ± 1.446% and 5.82 ± 0.620% for Improved Valachian, and 6.97 ± 1.514% and 5.62 ± 0.692% for Lacaune. For fat content, analyses showed a highly significant (P < 0.01) effect of flock-test day and a highly significant (P < 0.01) or significant (P < 0.05) effect of the month of lambing, with the only exception of the month of lambing in Lacaune. The effect of litter size was highly significant (P < 0.01) or significant (P < 0.05) in Improved Valachian and Lacaune. For protein content, analyses showed a highly significant (P < 0.01) effect of flock-test day and a highly significant (P < 0.01) or significant (P < 0.05) effect of the month of lambing. The effect of litter size was highly significant (P < 0.01) in Tsigai and Improved Valachian. Covariates of days in milk which modelled the shape of lactation curves were insignificant, except for Improved Valachian fat content (Ali-Schaeffer regression adopted for sheep). The model explained about 50% of fat and protein variation in the breeds, with coefficients of determination between 0.517 and 0.587 for fat content and between 0.495 and 0.527 for protein content. Fat and protein content were almost equally correlated with milk yield in the three breeds. Lactation curves were constructed on the basis of solutions of a statistical model employed in the analyses.

Suggested Citation

  • M. Oravcová & M. Margetín & D. Peškovičová & J. Daňo & M. Milerski & L. Hetényi & P. Polák, 2007. "Factors affecting ewe's milk fat and protein content and relationships between milk yield and milk components," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 52(7), pages 189-198.
    • Handle: RePEc:caa:jnlcjs:v:52:y:2007:i:7:id:2274-cjas
    DOI: 10.17221/2274-CJAS
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    References listed on IDEAS

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    1. M. Milerski & M. Margetín & A. Čapistrák & D. Apolen & J. Špánik & M. Oravcová, 2006. "Relationships between external and internal udder measurements and the linear scores for udder morphology traits in dairy sheep," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 51(9), pages 383-390.
    2. G. Ciappesoni & J. Přibyl & M. Milerski & V. Mareš, 2004. "Factors affecting goat milk yield and its composition," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 49(11), pages 465-473.
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    Cited by:

    1. Martin Ptáček & Michal Milerski & Tereza Michlová & Jaromír Ducháček & Vladimír Tančin & Michal Uhrinčať & Jitka Schmidová & Filipp Georgijevič Savvulidi & Luděk Stádník, . "Monitoring of milk performance of Wallachian sheep grazed under traditional Carpathian management in Western Beskids location," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 0.
    2. Martin Ptáček & Michal Milerski & Tereza Michlová & Jaromír Ducháček & Vladimír Tančin & Michal Uhrinčať & Jitka Schmidová & Filipp Georgijevič Savvulidi & Luděk Stádník, 2023. "Monitoring of milk performance of Wallachian sheep grazed under traditional Carpathian management in Western Beskids location," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 68(11), pages 460-468.

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