Czech Journal of Animal Science, 2005 (vol. 50), issue 10
Comparison of long-term selection responses of breeding policy in dairy herds
P. Šafus, J. Přibyl
Czech J. Anim. Sci., 2005, 50(10):439-449 | DOI: 10.17221/4246-CJAS 
Genetic and economic responses to genetic gain were evaluated for these breeding arrangements: single use of bulls under testing; single and repeated use of proved bulls for two years and for three years (in combination with selection intensity 1%, 5% or 10% of the best bulls for the use of proved bulls); negative selection of cows in the herd - 10%, 20% or 30% of animals are discarded from reproduction and the animals are left in the herd and used for breeding by beef bulls; negative selection of first-calvers in the herd - 10%, 20% or 25% of animals are discarded for slaughter; discarding of heifers and purchase of animals with higher breeding value,...
A comparison of parameters of the passage of nylon capsules and digesta calculated from faecal excretion data obtained in lactating cows
J. Třináctý, M. Richter, J. Pozdíšek, Z.M. Kowalski, E. Fajmonová
Czech J. Anim. Sci., 2005, 50(10):450-458 | DOI: 10.17221/4241-CJAS
The aim of the study was to compare parameters of passage of nylon capsules and digesta represented by Cr-labelled maize silage through the digestive tract of dairy cows. The capsules were made of nylon cloth (42 µm pore size, 10 mm outside diameter) and applied orally. The evaluation was carried out in dairy cows with milk yield of 19.0 kg/day. The diet (17.6 kg DM/day) consisted of maize silage, lucerne hay and concentrate. Total mean retention time (TMRT), delay time (τ), summarised compartmental mean retention time (CMRTS), and mean individual compartmental retention times (CMRT1 and CMRT2) were calculated. TMRT, τ, CMRTS, CMRT1 and...
Influence of lecithin emulsifier on the utilisation of nutrients and growth of piglets after weaning
P. Daněk, A. Paseka, J. Smola, J. Ondráček, R. Bečková, M. Rozkot
Czech J. Anim. Sci., 2005, 50(10):459-465 | DOI: 10.17221/4245-CJAS
The influence of supplementation of a lecithin emulsifier (0.1%) to the feed mixture for piglets after weaning was studied. 16 piglets in the control group (C - without lecithin) and 16 piglets in an experimental (E) group were monitored in three replications in a 28-day experimental period. We observed higher digestibility of monitored nutrients in the experimental group (crude fat: C = 66.28 ± 12.11, E = 69.75 ± 9.85%, crude protein: C = 78.72 ± 5.47, E = 82.17 ± 2.23%, crude fibre: C = 56.70 ± 12.85, E = 59.10 ± 12.04%, nitrogen free extract: C = 86.67 ± 3.32, E = 87.75 ± 3.00%, ash: C = 63.63...
Effect of microbial oil, monensin and fumarate on rumen fermentation in artificial rumen
D. Jalč, M. Čertík
Czech J. Anim. Sci., 2005, 50(10):467-472 | DOI: 10.17221/4238-CJAS
The objective of this study was to investigate the effect of microbial oil on rumen fermentation of a diet composed of 60% hay and 40% barley in an artificial rumen (Rusitec). Microbial oil (MO) was produced by the fungus Thamnidium elegans. This fungus grew on the wheat bran/spent malt grains (3:1) mixture. The fatty acid composition of microbial oil was as follows: 0.7% C14:0, 15.4% C16:0, 10.1% C18:0, 50.9% C18:1, 13.9% C18:2 and 8.4% C18:3 (GLA, γ-linolenic acid). The effect of monensin MON (66 ppm) and fumarate FUM (6.25 mmol) with and without MO supplementation was...
Restoration of a river backwater and its influence on fish assemblage
E. Hohausová, P. Jurajda
Czech J. Anim. Sci., 2005, 50(10):473-482 | DOI: 10.17221/4244-CJAS
The development of fish assemblage in a restored river backwater (Kurfürst backwater, Morava River, Czech Republic) was monitored over a six-year period from its restoration. The structure of fish assemblage remained similar throughout the years. Species richness of adult fish increased from twelve species during the restoration to 20 after it. Initially steady fish abundance (mean 52.3-98.1 inds/ha) and biomass (mean 5.8-7.6 kg/ha) increased significantly in 1999 five years after restoration (576.9 inds/ha and 23.3 kg/ha, respectively). The main resident species were pike Esox lucius, roach Rutilus rutilus, rudd Scardinius...
Economic values of traits for Slovakian Pied cattle under different marketing strategies
E. Krupa, M. Wolfová, D. Peškovičová, J. Huba, Z. Krupová
Czech J. Anim. Sci., 2005, 50(10):483-492 | DOI: 10.17221/4235-CJAS
Economic values of 15 production and functional traits for Slovakian Pied cattle were calculated under different marketing strategies. The traits were as follows: birth weight of calves, daily gain of calves in fattening, mature weight of cows, weight of calves at 120, 210 (weaning weight) and 365 days (yearling weight) of age, dressing percentage, mean class for fleshiness and fat covering, conception rate of heifers and cows, losses of calves at calving and from 48 hours to weaning, lifetime of cows and mean class for calving performance. A purebred cow-calf pasture system producing its own female and male replacement was assumed for all strategies....