Evaluation of Lactose Percentage in Relation to the Somatic Cells Count in Milk of Dairy Cows of the Slovak Spotted Cattle
2023
Jozef Bujko | Juraj Candrák | Peter Strapák | Cyril Hrnčár | Mariusz Bogucki
The aim of this study was to evaluate lactose percentage in relation to the somatic cells count in milk of Slovak Spotted cattle. A total of 468,082 control milk samples from 28,848 dairy cows born from 2000 to 2014 were used for investigating lactose percentage (LP), milk yield (MY), lactose yield (LY), fat percentage (FP), proteins percentage (PP) and somatic cells count (SCC). Data were analysed using the SAS version 9.4 and linear model with fixed effects: farmer (F), years-month of control (YM), order of lactation (OL), sire (S), coding of SCC (CS). In the dataset the average of LP was 4.78±0.27 %, while the one of MY, LY, FP, PP and SCC were 20.44±8.65, 0.98±0.43, 4.04±0.80, 3.49±0.37 and 455.95±1,296.16 cells *1000/ ml. The correlation of LP with MY, LY, FP, PP, and SCC was equal to r = 0.33205, r = 0.41609, r = -0.11414, r = -0.24404 and r = -0.31175. These correlation coefficients were statistically highly significant P <0.0001. Among all fixed effects in the analysis of variance of LP, the most relevant effect was observed for CS (P<.0001).
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