Avtor/Urednik		Klinkon, M; Zadnik, T; Nemec, M
Naslov		The impact of breeding, breed successive lactation, stage of lactation, season and somatic cell count on basic milk components
Prevedeni naslov		Vpliv reje, pasme, zaporednega števila laktacije, obdobja laktacije, sezone in števila somatskih celic na osnovne sestavine mleka
Tip		članek
Vir		Slov Vet Res
Vol. in št.		Letnik 37, št. 4
Leto izdaje		2000
Obseg		str. 197-208
Jezik		eng
Abstrakt		In high-producing cows a healthy udder is of greatest economic importance. Within the programme of permanent monitoring the milk profile test (MPT) is being implemented, it includes numerous parameters that help monitor the metabolic and health status of dairy cows. Indicators of subclinical mastitis are, among other factors also the basic milk components. On a monthly basis milk samples were (n = 804) collected during the lactation period from dairy cows (n = 105) on 5 farms. Basic components (% of fats, % of proteins, % of lactose) and SCC in milk were determined. We established that with the increase of SCC the protein content also increased linearly, while the lactose content decreased. With multiple analysis of variance we determined the impact of other factors (farm, season, breed, stage and number of lactations) and presented a part of the interpreted variance. With a statistical model we managed to interpret for milk components 47.47 % variability for % of lactose, 42.52 % variability for % of proteins and 24.29 % variability for % of fats and 44.18 variability for total SCC in milk. Statistically significant impact on basic milk components had the successive lactation, stage of lactation and total SCC.
Izvleček		Pri visokoproizvodnih molznicah sodi zdravo vime med najpomembnejše dejavnike uspešne reje, tako iz zdravstvenega kot ekonomskega vidika. V smislu stalnega nadzora (monitoring) izvajamo mlečni profilni test (MLPT), ki vključuje številne parametre, s katerimi nadzorujemo metabolično in zdravstveno stanje molznic. Med pokazatelje subkliničnega mastitisa štejemo tudi osnovne sestavine mleka. Molznicam (n = 105) s 5 farm smo mesečno odvzeli mlečne vzorce (n = 804), v katerih smo določali osnovne sestavine mleka (odstotek maščob, beljakovin in laktoze) in število somatskih celic (ŠSC). Ugotovili smo, da se linearno z naraščanjem ŠSC statistično značilno povečuje vsebnost beljakovin, medtem ko vsebnost laktoze v mleku pads. Z multiplo analizo variance smo ocenili vplive drugih dejavnikov (farms, pasma, obdobje laktacije, zaporedno število laktacije, letni čas) ter prikazali delež pojasnjene variance. S statstičnim modelom smo pojasnili 47,47 % variabilnosti za vsebnost laktoze, 42,52 % variabilnosti za vsebnost beljakovin, 24,29 % variabilnosti za vsebnost maščob in 44,18 % variabilnosti za skupno ŠSC v mleku. Statistično visoko značilen (P < 0,05) vpliv na sestavine mleka ima zaporedno število laktacije, obdobje laktacije ter skupno ŠSC.
Deskriptorji		LACTATION MILK CELL COUNT QUALITY CONTROL CATTLE TIME FACTORS LACTOSE FATS MILK PROTEINS