Czech Journal of Animal Science, 2007 (vol. 52), issue 8
Relationships between the incidence of health disorders and the reproduction traits of Holstein cows in the Czech Republic
M. Vacek, L. Stádník, M. Štípková
Czech J. Anim. Sci., 2007, 52(8):227-235 | DOI: 10.17221/2278-CJAS 
The objective of this study was to evaluate the relationships between several health disorders: milk fever (MF; hypocalcaemia and parturient paresis), retained placenta (RP; retained foetal membranes), metritis (ME; endometritis and pyometra), ovarian cysts (OC; follicular and luteal cysts), clinical mastitis (CM), and lameness (LS; foot and leg problems) as affecting the reproductive performance of dairy cows. The dataset of 1 432 Holstein cows calving between January 2000 and April 2004 from 4 commercial dairy herds was analyzed by the linear regression model which included the effects of herd-year-season of calving, parity, FCM yield level, incidences...
Stochastic simulation of the influence of insemination on the estimation of breeding value and its reliability
Z. Veselá, J. Přibyl, L. Vostrý, L. Štolc
Czech J. Anim. Sci., 2007, 52(8):236-248 | DOI: 10.17221/2281-CJAS
Insemination is used less commonly in the population of beef cattle than in dairy cattle. As a consequence, herds are genetically isolated and their comparison is difficult. The objective of the paper was to evaluate the impact of the use of reference sires in insemination on the estimation of breeding value and its reliability by means of stochastic simulation based on a single addition of calves to the basic set. Simulation was divided into three variants according to the connectedness calves through sires (variant 1 - unrelated calves, variant 2 calves related between HYS but unrelated within HYS, variant 3 - calves related within and between HYS)....
Qualitative structure of airborne bacteria and fungi in dairy barn and nearby environment
K. Matković, M. Vučemilo, B. Vinković, B. Šeol, Ž. Pavičić, S. Matković
Czech J. Anim. Sci., 2007, 52(8):249-253 | DOI: 10.17221/2280-CJAS
The study was conducted in a dairy barn and nearby environment to determine the level of air bacterial and fungi contamination. Measurements were performed in morning, noon and evening sampling periods once a week during two autumn months inside the barn and in a 25 m distant barn environment. A Merck MAS-100 air sampler was employed with different medium and incubation combinations for the capture and identification of bacteria and fungi. The results of the study showed a statistically significant difference (P < 0.05) between the bacterial and fungi counts measured inside and outside the barn, whereby total outside bacterial count was by...
Heritability of egg production in laying hens under cumulative, multitrait and repeated measurement animal models
A. Wolc, M. Lisowski, T. Szwaczkowski
Czech J. Anim. Sci., 2007, 52(8):254-260 | DOI: 10.17221/2282-CJAS
Six generations of three layer lines (13 770 recorded individuals of A22 line, 13 950 of A88, 9 351 of K66) were used to estimate genetic effects on egg production under cumulative, multitrait and repeatability models. Variance components were estimated by the AI-REML algorithm. The heritability of cumulative records ranged from 0.08 to 0.1. For the repeated measurements model the following genetic parameters were obtained: heritability 0.02-0.03, repeatability 0.04-0.38. The first two months of egg production were found to differ from the other periods: heritability was relatively high (h2 > 0.35) and low or negative correlations...
Slaughter yield, proximate composition, and flesh colour of cultivated and wild perch (Perca fluviatilis L.)
B. Jankowska, Z. Zakęś, T. Żmijewski, M. Szczepkowski, A. Kowalska
Czech J. Anim. Sci., 2007, 52(8):260-267 | DOI: 10.17221/2279-CJAS
The aim of this research was to determine the slaughter yield, proximate composition, and flesh colour of cultivated and wild perch (Perca fluviatilis). The study material was composed of fish obtained from intense fattening on formulated feed (age 1+, mean body weight (BW 116 g)) and wild specimens caught in a lake (age 3+, BW 119 g). The biometric traits of the two groups of fish did not differ with regard to body weight, total length (Lt), body length (Lc), or condition coefficient (P > 0.01). The cultivated perch had both higher maximum body height (H) and relative body profile (Rp) (P ≤ 0.01). The cultivated perch has...