Anti-staphylococcal effect of enterocin in Sunar and yogurt.

Enterocin was used to control the growth of Staphylococcus aureus strains SA1 and Oxford 209P in Sunar (milk nourishment for suckling babies) and during the yogurt-making process. Reduction by three orders of magnitude was noted in the growth of SA1 strain in Sunar milk nourishment between the enterocin-containing (ES) and the control samples (CS) at 1-d cultivation. An inhibitory effect of enterocin was observed when surviving of SA1 cells were checked 6 h after the start of cultivation (2 h after enterocin application; enterocin was applied after 4 h).

[Oxytetracycline in the milk of dairy cows with clinical signs of mastitis during the lactation period].

The objective of this study was to determine the oxytetracycline residues in milk from cows with clinical mastitis dosed with two extra-label routes of oxytetracycline administration not only during antibiotic's treatment (5 days), but also six days after treatment by use of a liquid chromatography method of testing with a detection limit of 20 ppb. Both groups of animals were treated once daily for five milkings at 24-hour intervals following morning milkings. Composite milk samples (equal volumes of foremilk from each quarter) were collected during morning and afternoon milkings, mixed together (1:1), and stored until analyzed.

Determination of staphylococcal enterotoxins in milk and milk products by three methods.

For food evaluation, the determination of the number of Staphylococcus aureus colonies is insufficient in the view of present scientific knowledge. The results, advantages and disadvantages of diagnostic methods are demonstrated on an example of three methods of detection of staphylococcal enterotoxins in milk and milk products. 133 strains were investigated with the method of biotyping of Staphylococcus aureus strains.

[Transport of nitrates and nitrites into the milk of dairy cows through the digestive system].

Increased nitrate concentrations in milk are not only dangerous to human health as the milk is the material for production of baby and infant food, but they cause also many problems in technological milk processing. The study was aimed at the transfer of nitrates and nitrites into milk of dairy cows following nitrate loading. An experiment included 6 dairy cows of the Slovakian Spotted breed at the Experimental Veterinary Centre at Zemplínska Teplica.

[Detection of staphylococcal enterotoxins in milk and milk products].

For food evaluation the determination of the number of Staphylococcus aureus (hereinafter S. aureus) colonies is insufficient in view of present scientific knowledge. The results, advantages and shortcomings of diagnostic methods are demonstrated on an example of three methods of detection of staphylococcal enterotoxins in milk and milk products.