Czech Journal of Animal Science, 2008 (vol. 53), issue 2

Models for evaluation of growth of performance tested bulls

J. Přibyl, H. Krejčová, J. Přibylova, I. Misztal, S. Tsuruta, N. Mielenz

Czech J. Anim. Sci., 2008, 53(2):45-54 | DOI: 10.17221/331-CJAS  

Before being used for insemination, young bulls of Czech Fleckvieh (CF) are tested for growth at performance-test stations. While at stations, the bulls are weighed monthly. Evaluation included 7 448 bulls with 82 676 records of weight measured from 6 to 520 days of life. In the station-year-period (HYS), which can be prolonged up to 3 months, different groups were tested according to the beginning of growth curve and according to test-days of weighing. Weight analyses were used to handle heterogeneous variability based on age. Legendre Polynomials (LP) with 5 parameters described the average growth curve for HYS classes. Deviations from average curves...

Effect of the stage of lactation on milk composition, its properties and the quality of rennet curdling in East Friesian ewes

J. Kuchtík, K. Šustová, T. Urban, D. Zapletal

Czech J. Anim. Sci., 2008, 53(2):55-63 | DOI: 10.17221/333-CJAS  

The evaluation of the effect of the stage of lactation on milk composition, its properties and the quality of rennet curdling was carried out over the period of three successive years using milk samples (n = 162) obtained from a total of 27 ewes of the East Friesian (EF) breed, reared on a small sheep farm in Juřinka in the region of Wallachia. The stage of lactation had a highly significant effect on the contents of all milk components. However, only the contents of total solids (TS), solids non-fat (SNF), fat (F), protein (P) and casein (CN) gradually increased with the advancement of lactation. The stage of lactation also had a highly significant...

Relationships between the results of various methods of urea analysis in native and enriched milk

P. Hering, O. Hanuš, J. Frelich, J. Pytloun, A. Macek, L. Janů, J. Kopecký

Czech J. Anim. Sci., 2008, 53(2):64-76 | DOI: 10.17221/332-CJAS  

Milk urea concentration (MUC) is a suitable indicator of the health and nutrition state of dairy cows. MUC is in relation to their reproduction performance, longevity and technological milk indicators. The interpretation correctness of results depends on their reliability. There are a lot of principles of MUC analyses. Their results can be affected by a number of interferential factors. Disproportions were noticed in practice. Therefore the sources of variation in results are studied. The goal of this study was to investigate relationships between different methods of MUC determination with the use of standard samples of native milk with an artificial...

The effect of feeding untreated rapeseed and iodine supplement on egg quality

M. Lichovníková, L. Zeman, J. Jandásek

Czech J. Anim. Sci., 2008, 53(2):77-82 | DOI: 10.17221/330-CJAS  

The objective of the experiment was to evaluate the effect of the feeding of 80 g/kg (R8) and 100 g/kg (R10) of untreated rapeseed (RS) on egg quality including sensory quality in comparison with a control diet without rapeseed (R0). The addition of iodine (I) was also evaluated (1 mg/kg (R10) vs. 3 mg/kg (R10+I)). "Double zero" RS was used. The contents of energy and crude protein were almost the same in the diets. Laying hybrid ISABROWN was used in the experiment. The quality of eggs was analyzed 11 times every 28 days, from 19 to 64 weeks of age. 30 eggs per each group were always analyzed. Boiled eggs were assessed twice around the peak of egg...

Effect of microclimate on the airborne dust and endotoxin concentration in a broiler house

M. Vučemilo, K. Matković, B. Vinković, J. Macan, V.M. Varnai, Lj. Prester, K. Granić, T. Orct

Czech J. Anim. Sci., 2008, 53(2):83-89 | DOI: 10.17221/329-CJAS  

Poultry farming is considered to be a notable source of bioaerosols. They can be a risk factor from the aspect of some diseases and for the environment. A study was conducted to assess the effect of microclimate on the level of airborne dust and endotoxins in an intensive broiler fattening facility. The content of airborne dust, endotoxins, air temperature, relative humidity, airflow velocity, ammonia and carbon dioxide were determined. The study was conducted in a poultry house accommodating 22 000 broilers of Ross-308 breed. The measured temperature in the broiler house ranged from 22.02°C to 31.05°C, relative humidity from 49.55% to 65.45%, and...