Some technological aspects on rennet extraction calves and adult bovine abomasa

The effect of age of the animal [calf or adult], state of the abomasa [water dry], shape of the tissues [minced, dried cuts or milled], abomasa or gastric mucosa and stirring either manual or mechanical in a water bath shaker on the yield protein content [PC], milk clotting activity [MCA] and proteolytic activity [PA] of the rennet extracts was studied. In addition, the effect of temperature [9 - 40C] on the extractability of rennet was also conducted. The extractability reached its maximum on day 8 at 25C depending on MCA and PA basis. While shaking had no influence on the extractability of rennet from calves vells, considerably enhanced it from minced and dried milled gastric mucosa of adult bovine. Dried milled calves vells and minced mucosa of adult bovine gave higher MCA and PA that the other forms of abomasa. The PC increased with the progression of the period and increasing temperature of extraction for calf and adult abomasa

Studies on staphylococci in milk and some dairy products 1 Microbial load and susceptibility of buffaloes and cows to infection with mastitis

Milk samples were collected from 14 Friesian cow, 6 Egyptian cows and 12 buffaloes during the lactation period and microbiologically analyzed. Total count, coliforms and the coagulase positive Staphylococci were determined. The microbial counts were, in general, higher than the sanitary standards. The Friesian cows were the most susceptible animals to Staphylococci infection followed by Egyptian cow and buffaloes, respectively. The highest total and staphylococci period. These were observed at the late lactation stage for Friesian cows, mid stage for buffaloes and at the early for Egyptian cows

Studies of the bacterial flora of raw milk in Fayoum markets

Fifty samples of raw milk were randomly collected from fayoum markets for bacteriological examination. The average counts of enterococci, coliform group, staphylococci, clostridium, aerobic spreformers and Bacillus cereus were, 80 * 10[4], 12 * 10[3], 17 * 10[2], 3.5 * 10,20 * 10[2] and 3.5 * 10 CFU/ ml respectively. All samples were free from salmonella. In addition psychrotrophic, mesophilic and lactic acid bacteria counts were counted in all the samples. On the other hand, 94.5%, 94.4%, 100% and 11.8% of indentified isolates were Streptococcus faecalis, enteropathogenic Escherichia coli, Bacillus cereus and enterotoxigenic Staphylococcus aureus respectively