| Abstract: |
This investigation was conducted on the farm of Faculty of Vet. Med.Zagazig Univ., Egypt, to evaluate the effect of teat dipping on the hygienicquality of raw milk. A total of 480 individual quarter (fore and quarter) milksamples were collected from ten dairy animals which classified into twogroups (5 each), the first group as a control while the other for conductingour investigations. Three commonly disinfectants used as postmilking teatdip (0.5% iodophor- 0.5% quaternary ammonium compounds and 0.64sodium hypochlorite). Milk samples (fore and quarter) were collected before and one, five and ten days after application of teat dip were subjected tohygienic quality tests and bacterial examination, the obtained resultsrevealed that:1- Hygienic quality tests:Q- Determination ofacidity%:The mean values of titratable acidity (T.A) before application ofiodophor in fore and quarter milk samples were 0.1833 and 0.1588, whileafter application of iodophor, the mean values of T.A. were 0.1666 and0.1455, 0.1433 and 0.1344,0.14 and 0.1255. Before using postmilking teatdip QAC, the mean values of T.A. were 0.1677% and 0.1522% in fore andquarter milk but after application of QAC, one, five and ten days, in fore and quarter milk samples, the mean values were 0.15% and 0.1366%, 0.1366%and 0.13%, 0.1277% and 0.1166% respectively.The mean values of T .A. before using sodium hypochlorite in fore andquarter milk samples were 0.18% and 0.1644%, while after one, five, ten
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