Determination of somatic cell count based on electrical conductivity of milk

Cilj raziskave je ugotoviti, ali obstajajo razlike v električni prevodnosti mleka med samimi četrtmi vimena s pomočjo naprave Mastritron LF 3000. Prav tako želimo ugotoviti in ali obstajajo razlike v električni prevodnosti mleka glede na način reje, pasmo krav, stadij laktacije in zaporedno laktacijo krav, vključenih v raziskavo. Skupno je bilo v raziskavo vključenih 249 krav, od tega je bilo 135 krav črno-bele pasme, 41 krav lisaste pasme ter 73 križancev z lisasto pasmo (LS×RH, LS×MB). Ugotovili smo, da se prevodnost skupnega vzorca, SŠSC [log10] in % laktoze med seboj statistično značilno razlikujejo glede na način reje P ≤ 0,05. Tako so krave v prosti reji imele nižje vrednosti pri električni prevodnosti skupnega vzorca (5,53 ± 0,55a) in SŠSC [log10] (2,00 ± 0,51a), imele pa so višji % laktoze (4,40 ± 0,44a). Pri primerjavi preučevanih parametrov glede na pasmo ni bilo ugotovljenih statistično značilnih razlik P ≥ 0,05. Ugotovili smo, da se električna prevodnost mleka po posameznih četrteh in SŠSC [log10] z višanjem stadija laktacije in zaporedne laktacije povečuje. Primerjane vrednosti se med seboj statistično značilno razlikujejo P ≤ 0,05. Aim of this study was to determine whether there are any differences in electrical conductivity of milk between udder quarters with microprocessor-controlled device Mastitron LF 3000. We also tried to find out if there are any differences in electrical conductivity of milk based on different housing systems, cattle breeds, stage of lactation and successive parity. Data for the study involved 249 cows of which 135 Holstein breed, 43 Simmental breed and 71 crossbreeds with Simmental breed. When we compared electric conductivity of milk based on housing system we found statistically significant differences in % of lactose and somatic cell count [log10] P ≤ 0.05. Cows on loose housing systems had significantly lower electrical conductivity of milk in overall sample (5.53 ± 0.55a and somatic cell count [log10] (2.00 ± 0.51a), but they had higher % of milk lactose (4.40 ± 0.44a) However we found no statistically significant differences in discussed parameters based on cattle breed P ≥ 0.05. We concluded that, with successive parity and higher lactation stages electrical conductivity of milk and somatic cell count [log10] become higher. All this parameters have statistically significant differences P ≤ 0.05.