The aim of the study was to examine the effect of dietary supplementation of isomerized poppy seed oil (IPO) enriched with conjugated dienes of linoleic acid (CLA) on cow and sheep milk parameters (fat content, fatty acid profile, Δ⁹-desaturase index, and atherogenic index). The process of poppy seed oil alkaline isomerization caused the formation of CLA isomers with cis-9,trans-11, trans-10,cis-12, and cis-11,trans-13 configurations in the amounts of 31.2%, 27.6%, and 4.1% of total fatty acids (FAs), respectively. Animal experiments were conducted on 16 Polish Holstein Friesian cows (control (CTRL) and experimental (EXP), n = 8/group) and 20 East Friesian Sheep (CTRL and EXP, n = 10/group). For four weeks, animals from EXP groups received the addition of IPO in the amount of 1% of dry matter. Milk was collected three times: on days 7, 14, and 30. Diet supplementation with IPO decrease milk fat content (p < 0.01). Milk fat from EXP groups had higher levels of polyunsaturated fatty acids, including FAs with beneficial biological properties, that is, CLA and TVA (p < 0.01), and lower levels of saturated fatty acids, particularly short- (p < 0.01) and medium-chain FAs (p < 0.05). The addition of IPO led to a decrease in the atherogenic index.

The aim of the study was the analysis of the structure of the population, relationship coefficients, and inbreeding trends in terms of: sex, breeding system, and inbreeding degree of Tatra Shepherd dogs. The breed's inbreeding rate was 6.34%, and for a standardised 4-generation population was 6.68%. The highest inbreeding rate was found in "non-champion-dogs" and in "Polish dog" groups consisting of males and females. The limit value F-X was exceeded for 25.65% of Tatra dogs, and the critical value was exceeded for 11.52%. An increasing ancestor loss coefficient (AVK) was found, which may result in an increased number of inbred animals. in particular, this referred to female dogs in the nCH, PL, and Z groups, whereas a significant increase of AVK was observed in the group of male dogs from foreign kennels. The resulting COR values were 55.58% for males and 55.44% for females.

The study aimed at evaluating the effect of feeding broiler chickens with diets containing faba bean and cold storage time on the physical properties of m. pectoralis major. The study material comprised 24 muscles from chickens split into 3 feeding groups. Birds from the control group (I) were fed with compound feeds containing soybean meal as the only highprotein component, whereas the starter/grower diets administered to experimental chickens contained faba bean in the proportion 8/15% - group II and 16/22% - group III, as a partial substitute for soybean meal. No effect of the feeding method on acidity and water absorption capacity of the muscle was observed. Muscles of chickens fed with mixes with a higher share of faba bean were characterised by higher yellow saturation, colour intensity and hue in comparison to other groups. The storage time had no effect on their physical properties; a decrease was only recorded in pH24 of the evaluated muscles, which testifies to the correct course of glycolytic transformations. To sum up, it must be stated that a higher share of faba bean in chicken diets modifies muscle colour only, but cold storage time has no impact on the evaluated physical characteristics of muscles.

The research aimed at analysing the slaughter value and physicochemical attributes of goat kids slaughtered at 90 and 180 days of age. After weaning at 60 days of age, a balanced mixture containing 18.2 % of protein and 5.63 MJ of net energy was applied as a feed. Some traits of live and slaughtered animal weight attributes were analysed. Moreover, tissue composition of the half carcass and meat physicochemical properties of meat were determined. The carcass of older male kid goats was by 5.08 kg (P≤0.05) heavier and the weight of primal cuts (P≤0.05) including high-priced cuts was by 0.87 kg higher than the young kids. Half carcass tissue composition of older and younger kids was similar: 60.13–60.50 % of meat, 25.48–25.37 % of bones, and 14.39–14.13 % of fat. Significant differences (P≤0.05) in fat and bone contents were only found in the leg. Furthermore, physiochemical properties indicated that the meat of older animals was darker and had higher values of chemical parameters.

The objective of the study was to analyse the slaughter value and physico-chemical properties of goat kids slaughtered at 150 days of age. After weaning, at 60 days of age a balanced feed mixture with a 10 % share of flaxseed was applied in feeding. There was found a significant (P≤0.05) increase in slaughter performance (45.80 %) and primal cuts (leg, saddle joint) obtained in the experimental group. There was also found significantly (P≤0.05) less (by 1 %) fat in the carcass of the aforementioned group. In contrast, a percentage share of meat in the leg (70.60 %) and the carcass (60.71 %) was statistically insignificant although it was slightly higher in the experimental group. The meat of male kids fed flaxseed was darker, (L* 42.60) at P≤0.01, and contained more (P≤0.01) dry matter (24.32 %) and protein (20.97 %) but less (P≤0.05) fat (1.92 %). The sensory assessment revealed similar cooking usefulness of goat kid meat and no statistically significant differences between the groups studied.