The seasonal influence, i.e. the influence of climatic changes on the dog semen was investigated. Dog age varied between 2-4. German-shepard-type dog body weight was about 25 kg, and the other mixed breed dogs about 9 kg. All were kept in good zoo-hygienic conditions (sunny, ventilated and dry rooms). Dogs were served ready-made pellet food with the daily meals adjusted to their body mass. Experimental researches were mainly performed before and during the sexual season. Sperm from the dogs was taken manually every 5-6 days. After obtaining the ejaculate, the sperm-sampler was inserted in pre-heated cotton, and brought to the andrologic laboratory. Tools and instruments used for ejaculate sampling were heated to +35°C before use. Quality control was performed with the devices and instruments heated to  +38°C in order to avoid detrimental effect of rapid cooling to sperm movement, metabolism, etc. Sampled native ejaculates were anylized for the volume, motility, concentration, etc. Key words: dog, sperm, sexual season

Udder health control has been conducted in three different cow breeds by comparing the California Mastitis Test results in order to justify its use in detecting subclinical mastitis. The test examined 75 cows, or 228 quarters in total. In 76% of the cows of different breeds, the results of California Mastitis Test were positive. The tests were positive in one or two quarters with the intensity level of one, two and three. The test showed much higher percentage of positive reaction in the rear quarters. According to the results of our research, the continuous application of this test enables the early detection of subclinical mastitis resulting in its prevention and also improvement in quantity and milk quality. Key words: mastitis, California Mastitis Test, cow

Swine breeding production as one of teh most perspective branch in livestock farming require particular attention when it is about reproduction of the flock. Final goal of every swine breeding farm is of course to increase reproduction of the animals and ensure healthy progeny. Aim of our research was to on the basis of detailed microscopic analyse of the ovaries in researched periods and results obtained accelerate reproduction in swine breeding production and by that total flock craft. We have culled 36 sows cross breed of Swedish Landrace and Large White whose are breeded in farm conditions in the periods of estrous and post partum. Immediately after culling we have separated ovaries from surrounding tissue and using micrometer we have measured lenght and width of evident follicles. Obtained results showed that the most ideal period for next mating of sows is 21 to 28 days post partum, when the biggest values of examined parameters had been recorded - lenght and width of follicles, what indicate to increase of ovarial activity.