The aim of the study was to compare the level of production traits of Holstein-Friesian cows imported from Germany with their native age mates. The course of parturitions in the studied animals was also evaluated. Native cows were characterized by higher milk yield in the first 305-d lactation compared with imported cows. Animals from Germany were superior to the local ones with regard to fat yield in kg and milk yield expressed in FCM. Protein yield was running at the same level. When analyzing the age at first calving, the significant differences (P ≤ 0.01) between the studied groups of animals were observed. Imported cows had greater number of difficult parturitions. The higher body weight of imported cows and lower body weight of calves were found in comparison with native cows.

The analysis included 399 Polish Noble Half-bred stallions registered in Vol. 2 of the Studbook of the Polish Noble Half-bred horses (PKSP) and 75 CzechWarm-blood stallions registered in the Studbook of the CzechWarm-blood horses (Kct). No significant differences were found in mean exterior measurements between the Polish Noble Half-bred and the CzechWarmblood stallions. In both studbooks, the dominant sire breeds are local breed getters, i.e. the Wielkopolski and the Polish Noble Half-bred stallions in the PKSP studbook and the Czech Warm-blood ones in the Kct studbook. Similar situation is being observed when analysing the ancestry pedigree of their dams; in both breeds, local breed mares were most frequently selected as female breeding material.

The subjects of the experiment were 80 Pekin ducks from P11 and P22 conservative flocks, 40 birds (20 drakes, 20 ducks) from each strain. Birds were kept in a confinement building in deep-litter pens and fed ad libitum commercial feed mixtures for waterfowl. Compared to P22 ducks, P11 ducks had greater body weight at 8 weeks of age (3372 vs 3338 g), longer trunk and keel (significant difference), and greater chest circumference (significant difference). Lower feed intake per kg body weight and greater values of the European Production Index (EPI) were found in P11 birds compared to P22 birds. Dressing percentage was high at 71.0% in birds of both strains. Percentage of breast muscles in carcass with neck was greater in P22 ducks (13.8%) compared to P11 ducks (13.5%). The proportion of leg muscles in carcass was the same (12.2%) in the birds of both strains. The proportion of skin with subcutaneous fat was higher in the carcasses of P11 ducks (31.4%) compared to P22 ducks (30.1%).

The studies examined an impact of a high naked oats share in a mixture on fattening results as well as slaughter value of pigs. Forty pigs (wbp x pbz) x (duroc x pietrain) for fattening with an initial weight of about 39 kg were assigned to two equal groups: control (K) and experimental (D). The control animals were fed a barley-based mixture whereas the experimental pigs were offered a mixture in which 2/3 barley was partially replaced by naked oats. It was found that an introduction of naked oats in the mixture for pigs fattened in group D had no significant effect on fattening results as well as slaughter analysis results. Proved, only significantly (P ≤ 0.05) lower about 2 cm2 loin eye area for the experimental group compared with the control (57.23 cm2). In muscles longissimus and adductor of pigs were fed mixtures containing naked oats observed more (P > 0.05 and P ≤ 0.05) crude fat, but they had higher (P ≤ 0.01) of share polyunsaturated fatty acids (PUFA). There did not prove significant differences (P > 0.05) in physical characteristic (pH, colour, WHC) of longissimus muscles whereas control pig adductor was darker (P ≤ 0.05). Taste value of meat (fillet, ham) experimental pigs were better about 0.38 and 0.32 points in the 5-point scale (P > 0.05).

The study was performed on the Black and White cows with a different proportion of genes of Holstein-Friesian cattle, and involved high yielding cows with a test day production up to 40 kg of milk. During the performed study, we determined the urea level in milk, which informed about the protein supply to cows, and the protein level in milk, which informed about the energy supply to cows. In cow feeding, an important and objective indicator of the properly balanced feed ration in respect of protein and energy is a urea level. Its mean content in milk of the examined population ranged from 242 to 269 mg · l–1 over individual examination periods. Evaluation of the feed ration balance in respect of protein and energy showed the existence of protein deficiency ranging from 152 to 361 g with the simultaneous energy deficiency ranging from 24.4 to 31 NEL (MJ). It was not found however, that the urea content in milk of the examined population exceeded the standard (150–300 mg · l–1).