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Relationship between the parity and oxidative stress in high-performance Polish Holstein-Friesian cows after the peak of lactation. There are many factors, which may expose cows attacks of free radicals. The highest level of oxidative stress appears in the parturition period and at the peak of lactation. Therefore, the purpose of this study was to demonstrate the relationship between the parity and...
Zmienność koncentracji funkcjonalnych kwasów tłuszczowych w mleku w okresie żywienia pastwiskowego krów. Celem pracy było określenie zmienności zawartości funkcjonalnych kwasów tłuszczowych (FFA) oraz zbadanie wartości wskaźnika miażdżycowego (AI) i wskaźnika trombogennego (TI) w mleku krowim w poszczególnych miesiącach sezonu pastwiskowego. Badanie zostało przeprowadzone w gospodarstwie niskonakładowym...
Meat quality of fattening pigs fed yellow lupin-based diets. The 30 crossbred pigs [(Landrace x Yorkshire) x Duroc] were fattened in 3. phase fattening period. In their nutrition as a source of protein was used soybean meal (Group C) or soybean meal and seeds of yellow lupine in the amount of 7.5% (Group E1) and 15% (Group E2). After achieving body weight of about 117.5 kg animals were slaughtered...
Forty carcasses (38.6-45.9 kg) from male and female (1:1) wild boar, which were shot in one hunting area during the 2014/2015 season, were studied. Samples of MLD were analysed for proximate chemical composition and fatty acid content of IMF as well as shear force and WHC. AI and TI index were calculated. Statistical analysis confirmed a significant (P≤0.05) effect of sex on the water content of MLD,...
Meatquality of fattening pigs born from sows fed different diets during early pregnancy. The aim of the study was to determine the pork quality of fattening pigs (Polish Landrace ´Polish Large White ´Duroc) originated from sows fed during early pregnancy (41 to 70 days) with diets differing in quantity and quality (LD1 vs LK sows – 130% of recommendations, LD2 sows – energy supplement). Thirty-six...
Effect of the backfat thickness at point P2 during insemination on the selected parameters of colostrum and milk of the sows. The studies included 32 females F1 (PL x PLW), inseminated with the semen from Duroc boars. The females were assigned to two groups: L – “lean” sows: P2 ≤18 mm at mating (n=16 heads) and F – “fat” sows: P2 >18 mm (n=16 heads). The observations were carried on from the day...
Relationships between milk β-carotene concentrations and the cytological quality of cow’s milk. The objective of the study was to describe the relationship between milk β-carotene concentration and the cytological quality of milk of high yielding cows. The experiment was carried out at the research dairy farm of the Warsaw University of Life Sciences (WULS). From a herd of 320 Polish Holstein Friesian...
Variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow's milk during grazing season. The aim of this study was to determine variation in the activity of stearoyl-CoA desaturase enzyme and endogenous precursors of unsaturated fatty acids in cow's milk during the grazing season. The study was carried out in 10 certified organic farms The...
Changes in cow’s milk composition and physical properties during the uninterrupted milking process. The chemical composition of milk determines the nutritional value and technological properties of milk and dairy products. Many studies have been performed on the chemical composition of milk, including fatty acid and protein profile, however a limited number of investigations have determined the changes...
Relationships between production traits and the parity of Polish Holstein-Friesian cows. The objectives of the study was to describe the relationships between milk urea, protein, fat concentrations and the age of Polish Holstein-Friesian cows. The experiment was carried out at the research dairy farm of the Warsaw University of Life Sciences (WULS). From a herd of 320 Polish Holstein Friesian cows...
The aim of the study was comparison of the milk performance of primiparous cows from 6 European countries with Polish Holstein-Friesians, as well as to demonstrate the differences within the different genetic groups. Material consisted of data contained in the dairy reports gathered from 26 farm “Healthy Cow” project. The analysis involved data including milk yield and its chemical composition, i...
Influence of lactation stage on selected blood parameters and biological value of cow milk during pasture season in organic system of production. The disproportion between the cow's genetically determined ability to produce milk and the limits to improving the energy value of feed may be the cause of the metabolic stress of animals kept at organic farms. Negative energy balance has a major impact...
Changes in the concentration of selected minerals in milk and blood of high- milking cows during lactation. The aim of this research was the analysis of the content of calcium, phosphorus and magnesium in milk and blood of Polish Holstein-Frisian (PHF) milking cows during full lactation. The research was conducted on 100 PHF cows during two years (50 cows in each year). Samples of milk and blood were...
The purpose of this study was to examine the influence phase of lactation on the concentration of saturated fatty acid in milk of high performance dairy cows. The experiment was conducted on the twenty PHF cows at experimental dairy farm of the Warsaw University of Life Sciences. The cows were kept in a free-stall dairy shed and fed on TMR (total mixed ration) diet. The cows had continuous access...
The aim of this study was the quantitive determination of cis-9, trans-11 isomer by two methods: gas chromatography (GC) and silver-ion high performance liquid chromatography (Ag+HPLC) in ewes milk fat. The study was carried out on 20 ewes of Wrzosówka and Żelazneńska sheep, which were mantained at the same environmental and nutritional conditions. The milk samples have been collected from ewes at...
The chemical composition and fatty acid profile of milk of Polish Mountain Sheep (PMS) and Polish Merino (PM) were investigated. The study was carried out on 20 suckling PMS ewes from the flock of Podhale region and on 20 PM ewes from the flock located in central part of Poland. The animals were fed winter diet. The milk samples have been collected from ewes at the age of 3–4 years and in the 4th...
The objective of the present study was to evaluate the fatty acid composition of cows milk, kept in a certified organic farm, independent of breed and season of nutrition. In the selected dairy farm, cows of two different breeds, i.e. Brown Swiss (BS) and Holstein-Friesian black and white (HF) between 45th–100th day of lactation, were managed under the same environment conditions. There were highly...
The objective of the present study was to evaluate the chemical composition and technological usefulness of cows milk kept in a certified organic farm. In the selected dairy farm, cows of two different breeds, i.e. (BS) and Holstein-Friesian (HF) between 45th–100th day of lactation, were managed under the same environment conditions. Results showed that in the summer and winter season milk yield,...
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