The study was performed on 7 female dogs, in which the experimental procedure depending on lateral or bilateral extirpation of the mammary gland complexes with leaving the skin was carried out. One dog constitued the control group. All animals were kept alive for 21 days, after which they were put to sleep and the following material was taken for further examination: the brain stem, the thoracic-lumbar-sacral part of the spinal cord with adeqate nerve ganglia, sympathetic trunk ganglia and the following ganglia and plexuses of abdominal and pelvic cavity: celiac, cranial mesenteric, intermesenteric, caudal mesenteric, hypogastric and pelvic. The material was fixed in formalin, dehydrated in alcohol and after embedding in paraffin – cut into 15μm thick slides. The slides were stained according to Klűver-Barrera’s method and Nissel’s method. The comparison of the retrograde changes in neurons in the experimental animals with the localization of similar changes effected by the same operational procedure in the control animal gave rise to establishing of the localization of the nerve cells being the source of origin of visceral-sensory neurons reaching the mammary gland in female dog. The results of the study point directly to the fact that afferent nerve fibres supporting the mammary gland in female dog come mainly from complex of spinal ganglia.

Abstracts. The purpose of the study was to determine the influence of lead acetate on the distribution of ”endogenic” iron in rabbit tissue and body fluids. The study was conducted on clinically healthy mongrel rabbits. Lead acetate at the doses of 0,4 or 2,0 mg/kg b.w. was injected once inravenously. The rabbits in the control group were treated with 0,9% saline solution. After euthanasia, in 72^nd hour after injection of lead acetate samples of liver, kidneys, brain, skeletal muscles, perirenal fat, blood and urine were taken and mineralised dry a muffle furnace at 450ºC. Iron was determined directly in mineralisate by the atomic spectrophotometry on a Pye Unicam SP-9 apparatus. It has been found that the administration of lead acetate dependent on the dose applied changes the level of ”endogenic” iron in the examined tissues. The exposure to lead acetate at a dose of 0,4 mg/kg decreases the level of ”endogenic” iron in the liver and fat of rabbits. After administration at the dose of 5 times higher observed significant increase „endogenic” iron in kidneys and blood.

The investigation made on 11 American Staffordshire Terrier pupes. Examinated morphological analysis of the suprarenales glandolae in support of morphometric measurements, anatomical structure and topographic. Realized the records photographic and tabular.

The examination was carried out on vagal trunks of six domestic pigs in the age of 5–6 months. After fixing, the preparations were stained with cresyl violet according to Klüver-Barrera’s method and with the methylene blue according to modified Nissl’s method. It was stated that most ganglionic cells were present in the thoracic part, and the fewest in the abdominal part. The cells structure is the same in all parts studied. Majority of the cells is of 20 to30 μm size. Comparing the left and the right vagus nerve, no greater differences were spotted as far as the positioning of the ganglia, their number and size was concerned; the cell shape and their size and number do not point to the differentiated structure in the opposite nerves.

The brains of the cattle fetuses in the age from 8 weeks until 29^th week and the brain of a newborn were collected for the study. The development of gyrus dentatus in specific stages of fetal life was described. The greatest changes were observed in the 20^th week of life. In this period a layer of granular cells is being developed. A layer of multi-form cells is also visible. Molecular layer, which is clearly separating itself at this stage, contains scarcely placed nerve cells. In the third trimester of pregnancy, the layer of granular cells contains neurons of the oval and fusiform cells. It was observed that gyrus dentatus in cattle fetuses starts to display structural differentiation in the 14^th week of pregnancy. In the fetal life of cattle a parallel development of gyrus dentatus in relation to Ammon’s horn was observed.

The purpose of our work was morphology description of Ganglion cervicothoracicum of 9 week old pig’s fetuses. The research material were 12 9-week-old fetuses from one uterus. We described the topographical position, appearance and nervous connections of cervicothoracic ganglion. We took measures of length, widith of ganglion distance among its components. The results were analyzed statistically by means of Excel 2000 programme.

The efficacy of varroosis control with Apifos strips used in the last year as well as with the new strips was very high. During a 6-weeks exposure of the strips in bee colonies, in group I with re-used strips 95.32% mites fell off on the average. In group II with new strips, the fall of the parasite was only by 2.86% higher. The remaining part of the fall, amounting respectively to 4.68 and 1.82%, was collected from the bottom inserts following fumigation of bee colonies with Apiwarol. The evaluation of bromfenvinphos content in the strips following their withdrawal from bee colonies showed that the amount of active ingredient differed greatly and depended on their multiple use. For the strips used twice (group I), the content of active ingredient oscillated within the range 3.01 to 19.39 mg/strip, whereas for those used once (group II) it was within the range 26.65 to 51.18 mg/strip. Its average level for the first strips was 8.22 mg, whereas in the second ones several times higher – 38.78 mg per one strip. At the same time it should be stressed that only in re-used strips the bromfenviphos content was conditioned significantly (r = –0.551) by the degree of erasure of the microlayer covering them. The bromfenvinphos content found in the strips following a single 6-weeks exposure in bee colonies is sufficient for acquiring the high efficacy of treatment, which is demonstrated by the obtained results.

Application of transparent protective coating on raw pork and beef positively affected their microbiological and technological features. Stored under cooling conditions, raw coated meat exhibited up to 3 log lower total number of aerobes, when compared with controls.The growth of coliform group was less intensive as well. Comparing to control samples water evaporation was 2% and 4% lower in coated pork and beef, relatively. Considering coloration of coated meat, it was less saturated with grey colour.

The experiments were conducted on blend film (50 mm length) prepared from starch and synthetic polymer with and without antioxidants which were placed in so – called artificial rumen for 5 days. After this time were determined decrease of dry matter of plastic, tensile strength and elongation. The addition of oxidizing substances in plastic or submission before treatment in artificial rumen processes: soaking and roasting caused decrease of plastic elasticity about 60–85%. Plastic composed on the ground of 70% of starch also characterized lower about 60% of elongation during rupture than plastic before treatment in rumen. Plastics which contained lower values of component without antioxidant and was not exposed any manipulations were more elastic in this environment. But plastics with oxidizing substance and treated (before location in rumen) processes: soaking and roasting (irrespective of composition) were characterized about 80–90% of lower resistance in comparison with plastics film placed in rumen environment. The influence of plastics degradation in rumen environment on feature mentioned above was not significant.