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2018 | 27 | 2 |
Tytuł artykułu

The relationship between somatic cells and milk traits, and their variation in dairy sheep breeds in Slovakia

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The objective of this study was to analyse milk traits (milk yield from morning milking, and fat, protein and lactose contents) and somatic cell count (SCC) in dairy sheep breeds in Slovakia: Tsigai (TS), Improved Valachian (IV) and Lacaune (LC), and their crosses (IV × LC and TS × LC). Milk performance testing was performed between 2010 and 2013. Mixed model for milk traits included fixed factors: SCC class (low, medium high), lactation number, month in milk, year-month of measurement, genotype, lactation number × month in milk interaction, lactation number × SCC class interaction, and random effects of ewe and residual error. Mixed model for log10SCC (decadic logarithm of SCC) included the same factors except for SCC class and lactation number × SCC class interaction. Instead, covariates of milk yield and milk components were considered. Milk yield and lactose content decreased (P ≤ 0.05 and P ≤ 0.01, respectively), whereas fat and protein contents increased (P ≤ 0.05 and P ≤ 0.01, respectively) with increasing SCC. Similar trends were revealed when relationships between log10SCC and milk yield and milk components were investigated through linear regressions and correlations (however, not all regressions were statistically significant, also correlations between log10SCC and milk yield and between log10SCC and fat content were very weak). To ensure the effectiveness of mastitis control programmes, further research is needed to understand an importance of somatic cells function as an indicator of health status which may affect ewe udder, milk yield and milk components.
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Opis fizyczny
  • National Agricultural and Food Centre – Research Institute for Animal Production Nitra, Institute for Animal Husbandry Systems, Breeding and Product Quality, 95141, Luzianky, Slovakia
  • National Agricultural and Food Centre – Research Institute for Animal Production Nitra, Institute for Animal Husbandry Systems, Breeding and Product Quality, 95141, Luzianky, Slovakia
  • Department of Veterinary Sciences, Slovak University of Agriculture in Nitra, Faculty of Agrobiology and Food Sources, 94976 Nitra, Slovakia
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