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Dairy sheep sector is a traditional branch of livestock sector in Slovakia. Local breeds: Tsigai (TS) and Improved Valachian (IV) are the most numerous breeds. Highly productive specialized dairy breeds: East Friesian and Lacaune (LC) were launched in the 1970s and 1990s, respectively. In order to increase milk yield of local breeds, twoand threebreed crossbred composite populations (either on base of TS or IV) were formed during two last decades. Daily milk yield, fat and protein contents and factors affecting their variation in dairy sheep were studied in detail (Oravcová et al., 2006, 2007). Not only daily milk yield, fat and protein contents are good determinants of the quality of sheep milk, but also somatic cell count (SCC) is an important udder health indicator (Abdelgawad et al., 2016). Mastitis is a costly health problem in dairy ewes (Arias et al., 2012); mammary infections damage udder tissue ABSTRACT. 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. Received: 15 June 2017 Revised: 5 December 2017 Accepted: 1 June 2018

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