Abstract.Atotal of 840 calvings and lactations were analysed in 340 Polish Holstein-Friesian cows in 2003–2006. The following reproductive traits of the cows were determined: calving interval, calving to conception interval, period of reproductive quiescence, remating interval and insemination index. These traits were analysed in terms of milk yield over a full lactation. Coefficients of correlation were also calculated between milk yield and reproductive parameters analysed. The reproductive parameters studied were significantly differentiated by the milk yield of cows. The calving interval increased from 369 days (milk yield <6000 kg) to 540 days (milk yield >14 000 kg). In the successive classes of milk yield, the calving to conception interval increased from 98 to 264 days, the period of reproductive quiescence increased from 68 to 117 days, and the remating interval increased from 30 to 147 days. The insemination index was the lowest (1.8) in the first class of milk yield and the highest (3.6) in the sixth class of milk yield. The coefficients of correlation between lactation yield and the reproductive parameters analysed were positive and highly significant. The highest coefficients of correlation (0.4xx) were found between milk yield and the calving and calving to conception intervals.

The research was carried out on Cobb-500 chickens. The amount of stock was 18 000 chickens, which were control group, from this group the experimental group was separated in mount of 100 birds. Control group was fed with balanced full – fed mixtures and watered with clear drinking water. The second, experimental group was supplemented with copper (30 mg Cu·l^–1 H₂0) in drinking water from chelat Cu-lysine. In the 6th week of chicken life, the blood samples were collected from both groups and biochemical indices (activity of ASPAT, ALAT, LDH, ALP, the level of cholesterol, uric acid, triglicerydes, glucose and total protein), basic hematological and content of mineral components were examinated. After supplementation Cu-Lys significant increase of cholesterol and tryglicerides, in comparison with control, took place. The significant influence of chelat on hematological indices of blood wasn’t noticed. The content of K, Mg increased under influence of Cu ions, however the level of Ca, P in blood decreased. But the differences weren’t significant.

The purpose of the study was to specify and evaluate half-bred and Arabian horses’ behaviours tested for racing performance on the Wroclaw – Partynice Racecourse in the 2006 season. 74 half-bred horses (42Malopolska breed, 8Wielkopolska breed, 24 PolishWarmblood) as well as 69 PurebredArabian horses which participated mainly in flat races were evaluated on a scale of 1 to 4. The behaviour was evaluated during taking horses round a paddock, at the time of mounting them by riders and during coming into a starting machine. Differences in the behaviour of the horses dependent on coaches, gender and the number of races were indicated. Moreover, relationships between examined factors and the individual success coefficient (ISC) were calculated. The most stressful activities were the following: coming into a starting machine and taking round a paddock, whereas the least stressful activity was mounting. It has been proved that mares are more stress-resistant than stallions. Negative correlations between the evaluation of horses’ behaviour at the paddock and individual success coefficient in PurebredArabian horses and Malopolska breed indicate that horses of these breeds strongly manifest pre-starting stress. High marks for behaviour correlated with more frequent participation in races prove that horses easily adapt to stressful conditions.

The research covered 42 primiparous gilts Polish LargeWhite. Sows’ body weight at first day of mating and 30th, 60th, 90th, 110th day of pregnancy and the day of weaning was controlled. Significant (P <= 0.05) positive coefficients of phenotypic correlations was estimated between body weight of sows in 30th day in pregnancy and number of piglets born alive (0.305*) and between body weight of sows in 30th, 60th, 110th day of pregnancy and number of piglets weaning (0.304*, 0.302*, 0.309*). Significant (P <= 0.01) positive coefficients of phenotypic was found between body weight of the sows to study of pregnancy phase and weight of litter and weight of piglet in 21th day of rearing (from 0.406** to 0.655**). The obtained results show that body weight of sows in pregnancy affected on their reproductive performance, especially the results offspring rearing.

The experiment was conducted on a farmlocated in the Province ofWarmia andMazury (NE Poland) over the years 2004–2006, on a group of 92 Polish Holstein-Friesian cows with 287 completed lactations. The aim of the study was to determine some performance traits of these cows as dependent on their maximum daily milk yield during successive 305-day and full lactations. The cows were divided into three groups: group 1 – cows with a maximum lactation milk yield ≤ 20 kg, group 2 – cows with a maximum lactation milk yield from 20.1 kg to 30 kg, group 3 – cows with a maximum lactation milk yield > 30 kg. The most cows were culled during the second and third lactation (67.39%). The highest mean daily milk yield was recorded in group 3, reaching a peak during the third lactation (40.23 kg). The productivity of cows was found to increase until the third lactation. It was at the highest level in group 3: 8684 kg of milk, 8887 kg of ECM, 574 kg of fat and protein, at milk fat and milk protein content of 4.21% and 3.38%, respectively. The highest concentrations of milk fat and milk protein were observed in the group of cows with the lowest daily yield, i.e. ≤20 kg of milk. The mean length of the first three inter-pregnancy and inter-calving intervals was within a normal range. In consequence, both the production and reproduction cycle did not exceed 365 days. The highest coefficients of correlation were noted between milk yield and fat yield (r = 0.92), protein yield (r = 0.98) and dry matter content (r = 0.99). An increase in milk yield was accompanied by a decrease in protein content (r = 0.07) and a slight increase in the levels of fat (r = 0.25) and dry matter (r = 0.16). The milk performance traits of cows had no significant effect on the length of the inter-pregnancy and inter-calving intervals, which were found to be positively correlated with the insemination index values (coefficients of simple correlation: 0.38 and 0.54, respectively, at a significance level P ≤ 0.05).

The aim of present study was to analyze selected results of beef cattle recording of purebred Charolaise and Limousin as well as their crossbreds with HF with reference to breeding goals and standards of Polish Beef Cattle Breeders&Producers Association (PZHiPBM). The results of beef cattle performance in the years 2000–2005 were the material for the research. The results for purebred Charolaise and Limousin population as well as their crossbreds with Polish Black&White cows were analysed. The permanent increase of Limousin genes share in purebred and crossbred and stable share of Charolaise genes in purebred female population were observed. Body weigh of purebreds and crossbreds with Charolaise breed are out of standards of breeding goal, when with Limousine breed slightly differ from it. There were no differences in body weight at birth between purebred and crossbred Limousin calves. Purebred Charolaise calves were much heavier than the crossbreds.Average daily body weight gain of purebred heifer calves were higher than those stated in the breeding standard, whereas for crossbred heifers were much lower. Purebred calves had higher body weight at weaning than the crossbreds. The differences were higher for Charolaise (21 kg bulls and 28 kg heifers) than for Limousin breed (5 and 4 kg).