Dairy production, farming practices and characteristics of milk of dairy cattle farms in mountain areas of Kabylia (Algeria)

摘要

ThepurposeofthisstudywastocharacterizethequalityofthemixturemilkofdairycattlefarmsintheconditionsofAlgerianproduction(mountainousareaofKabylia).134farmsweremonitoredfortwelvemonthsduetoonesamplepermonth,weresubjectedtoaninvestigationthatincludesthestructure,milkingpractices,hygieneofanimalsandthecharacteristicsofmilk.TheanalysisofaverageannualresultsshowedaFRandPRrespectively37,9±5,75g/land33,5±2,6g/lareabovethestandardsoftheAlgeriandairyindustriesandarateoftotalbacteriathan5x105cfu/ml.21,6%ofthefarmshadafreezingpointhigherthan-0,52°C.Thelactosecontentofwhichis43,15±2,96g/landstilllowcomparedtostandards.TheCMTtestperformedon150dairycowsin22farmswasfoundtobepositivein47%ofcows.Themilkyieldwasestimatedto4805±1489kg/DC/yearand14,36±4,6kgoftechnicalaverage/DC/Dforanaveragedairymilkof38477±27537Kgperfarm.Thelatterislargelydependentontheconcentrate.PCAwasperformedtoconstructatypologyofmilk.Thisidentifiedthreeclassesofmilk:Classes1and2arerelativelygoodphysicochemicalandhygienicqualitymilkwithaverageclosertotheaverageofthetotalsample;incontrast,Class3ischaracterizedbymilksofinsufficientquality.