[Economic evaluation of the method of gradual formation of groups of dairy cows from primiparae free of infectious mastitis]

Employing the turnover of a dairy-cow herd with primiparas to control infectious mastitis is beneficial because young dairy cows, as a rule free of inflammations of the mammary gland, are not included among dairy cows already infected or suspected of being infected and so it is possible to form groups of dairy cows free of mastitis. For this intention an agricultural enterprise was chosen in potato production region I. In the given period 316 to 336 dairy cows of Bohemian Spotted breed were followed. To express the impact of the infection on the milk efficiency and to draw economic conclusions on the efficiency of treating infectious mastitis we observed the total milk yield of the different dairy cows in one lactation. In the given enterprise unsuccessful treatment of an infected dairy cow in three lactations resulted in a total loss of 4,648 Kcs. Therefore from the economic aspect it appears to be profitable to replace productive, but ill, older dairy cows by healthy first-calvers because the negative effect of the mastitis on the production of milk increases with every successive lactation.

A new method of haemostasis following transvesical prostatectomy

Description of an efficient modification of haemostasis following transvesical prostatectomy with the help of semicircular tightening sutures of the bed. 25 patients have been operated as described here and none of them experienced postoperative complications.

[Devitalizing effect of Jodonal A in vitro on bacteria subject to a short-term exposure]

In a three-minute exposure in vitro Jodonal A devitalized a culture of serological group B streptococci in a 2% concentration, Staphylococcus aureus in a 16% concentration, Pneumococcus in a 4.5% concentration, Corynebacterium pyogenes in a 2.5% concentration, Pseudomonas aeruginosa in a 3% concentration, and Klebsiella pneumoniae in a 2% concentration. Hence Jodonal A concentrations higher than 16% should be tested for udder teat disinfection after the removal of teat cups.

[Determination of the effective concentration of Jodonal a for the disinfection of the skin and teats after milking]

The bactericidal effectivity of Jodonal A in 1:10, 1:5, and 1:3 solutions was tested on human skin and on the teats of cow mammary glands. The 1:3 dilution ratio proved best for three-minute exposure. Jodonal A used in this concentration in 522 cows for the post-milking disinfection of teats for 10 months exerted no harmful effect on the skin of the mammary glands.

[Type differentiation of serological group B streptococci isolated from milking-cow mammary glands]

By means of type differentiation of the serological B group streptococci isolated from the cow mammary glands the following type antigens could be found: Ia 8X, Ib 4X, II 40X, III 16X, R 4X, X 80X. In 54% of the cultures examined several antigenic types were concurrently found. In one mammary gland several antigenic differentiation; epizootological investigation; cross reactions impedes the utilization of type differentiation of the serological B group streptococci for epizootological investigation. The individual antigenic types of the serological B group streptococci can partially be separated by the examination of isolate colonies.