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The population of Polish Red (PR) cattle systematically decreases because of its low milk production. However, there are farmers, who are interested in keeping PR cows in the suckling system. The aim of the study was to evaluate different forms of milk and beef production (combination of factors e.g.fattening bulls, heifers raising, milk or beef production) characterizing farm production from the...
Evaluated were changes of temperature and relative air humidity inside a free-stall barn affecting the welfare of cows of three technological groups during a hot summer. The effects of selected microclimate parameters of the barn have been assessed based on the THI (temperature-humidity index) in relation to milk production. The research revealed that the animals suffered from thermal stress which...
The aim of this study was to analyse the impact of heat treatment methods (frying – FR, grilling –GR, roasting – RO 180°C, roasting – RO ΔT) on certain physical properties and the cooking yield of selected muscles of cattle. Used were samples of five muscles from 40 beef carcasses: m. longissimus lumborum (LL), m.semimembranosus (SEM), m. semitendinosus (SET), m. psoas major (PSM) and m. triceps brachii...
Free radicals are natural final products of the intensive metabolism in cells located in organism high-yielding dairy cows. When the disturbing of homeostasis occurs, oxidative processes lead to oxidative stress which in high-yielding dairy cows cause inflammation of the mammary gland (mastitis). The inflammation can cause the reduction of milk yield and unfavourable changes in the milk composition,...
The study was conducted on Polish Holstein Black-and-White cows. From a herd of about 300 animals maintained in a free-stall dairy shed, two groups of 10 were selected by the analogue method:primiparous (P) and second-lactation cows (SL), taking into consideration the stage of lactation (90±30 days) and daily milk yield (35.42±2,6 kg). During the first 7 days (that were considered the initial period...
The study was carried out in order to evolve, adopt and optimize the new system for preparation of nuclear recipient cells at different stages preceding the somatic cell nuclear transfer (SCNT) in pigs, including in vitro maturation (IVM) of oocytes. The system was applied to facilitate and accelerate the epigenomic reprogrammability for gene expression of donor cell nuclei that had been transplanted...
A common chicken broilers rearing house and fattening pig barn were monitored for harmful gases concentration (NH3, CO2, NO2 and CH4). In chickens the concentrations of NH3 rose during fattening periods in all seasons of the year (from 0.23 to 10.77 mg.m-3). They varied depending on the ventilation rate and were influenced by litter temperature. The daily mean concentrations of CO2 were decreasing...
The objective of the study was to investigate ER-α gene polymorphism (A/G transition) in 5′ region in consensus promoter for exon C, determine its allelic and genotypic frequencies and assess its association with cattle performance. Genomic DNA was extracted from 200 dairy Holstein cows In four farms in Isfahan province of Iran and the individuals were genotyped by PCR-RFLP technique. The DNA fragments...
Effects of trait heritability (0.05 or 0.25), effective daughters number (30 to 500), sires number (10 to 500), and sire selection (selecting or not the top 50% sires), were evaluated based upon standard error (SE) and bias of genetic correlations (rG) between countries estimated from Calo’s method (rG) using simulated data. Calo’s method is based on correlations between sire’s predicted transmitting...
Evaluated was the influence of live cells and metabolites of yeast (Saccharomyces cerevisiae) in the diet on number of ciliates, concentration of volatile fatty acids (VFA) in the rumen and biochemical parameters of blood of heifers. The experiment was carried out on three rumen-fistulated heifers. The animals were fed diet consisting of 88% meadow hay and 12% concentrate. A dose of 10 g of live yeast...
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