Relationship Between Bio-Climatic and Milk Composition Data of Dairy Sheep Farms: Comparison Between THI and Multivariate Weather Index.

All the fixed effects analyzed—month (year), flock size, flock size × THI, THI (year) and THI (month)—were highly significant ( p < 0.001) for all milk composition traits, with the exception of log 10 SCC ( Table 3 ).

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A decreasing trend for bulk milk protein was observed for higher THI MAX classes −2d before sampling (from 62 to 74), but this decline was minor for bulk milk of small flocks, whilst it was greater for larger farms.

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Somatic cell count did not have a clear trend, remaining nearly constant, whereas the total bacterial count showed higher inter-annual variability in June and July, conversely to what has been observed for dairy cattle, as dairy sheep farming is characterized by the high seasonality of lambing ( Figure 2 ).

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