8/10/2019 Rrl Mk Lawan

1/1

Milk has highnutritional values and an important source of protein, minerals,

vitamins and fat in human diet. It provides excellent medium for growth of both

pathogenic and spoilage microorganism. This study was carried out with the aim of

assessing themicrobial qualityof bulk milk before and after pasteurization, in two

different dairy farms in Zaria. Bulk milk samples were collected on daily basis for a

period of 30 days during which 30 samples each, of pasteurized andraw milkwerecollected from each of the farms making a total of 120 milk samples. The both

samples ofraw milkbefore pasteurization and post-pasteurization of farm A and B

were analyze for total aerobic, coliform plates counts and E. coliisolation rates.

Mean results of aerobic plate counts ofraw milkfor farm A and B before

pasteurization were; 5.70 and 6.04 log10CFU mL-1, respectively. These counts

decrease to 3.76 and 4.20 log10CFU mL-1after pasteurization of the milk. Similarly,

the E. coliisolation rate for farm A and B were; 20 and 53.3%, respectively. These

also decrease to 6.7 and 13.3% after pasteurization. In addition, coliform counts

also follow similarly trend. The coliform count in farm A and B were; 5.32 and 6.49

log10CFU mL-1, respectively. The counts decrease to 3.16 and 3.74 log10CFU mL

-

1after pasteurization of the milk. Total coliform and aerobic plates counts before

bulk pasteurization in both farms were significantly different (p