Document Type : Original Article
Authors
1
Dairy Sci. Dept., Fac. Of Agric, Tanta Univ., Kafr EI-Sheikh
2
Animal Prod. Res. Institute, Min. Of Agric·
Abstract
Covering a period of one year. weekly samples (rom milk for manufacturing
were collected to represent bulk milk of about 15-25 tans per day. The chemical
analysis showed that the max. TS(14.3%). fat (4.52%), protein (4.37%), casein
(3.33%), o.·CN(1.97%), ~CN (0.75%), K-CN (0.39%), serum protein (0.98%) and
lactose (4.8%) were recorded in Dec., Feb., Dec., Nov .• Nov., Nov .. Dec., Dec. and
Aug in order. The corresponding min. percentages of 12.76,3.97.2.79,2.18.1.0,
0.38, 0.18, 0.37 and 4.4 were recorded in Jul., Oct., Aug .. Aug., Sept., Aug .. Feb ..
Sept. and Jut. respectively. Winter milk had the highest TS (13.74%), fat (4.4%),
protein (3.83%), casein (7.86%), arCN (1.51%), ~CN (0.63%). serum protein (0.7%)
and lactose (4.66%). Summer milk had the lowest TS (12.89%). protein (3.04%),
casein (2.23%), o,·CN (1.12%), ~CN (0.46%) and lactose (4.59%).
Nitrogen distribution was Significantly aHected by month and season of the
year. Bacteriologically. months and seasons of the year had a highly significant effect
on total, proteolytic, lipolytic and colifom bacterial counts.
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