Czech Journal of Animal Science, 2006 (vol. 51), issue 12
Evaluation of parentage testing in the Czech population of Holsteincattle
V. Řehout, E. Hradecká, J. Čítek
Czech J. Anim. Sci., 2006, 51(12):503-509 | DOI: 10.17221/3970-CJAS 
A set of 233 Holstein calves, their 233 dams and 44 sires from 4 large-sized herds was genotyped for 10 microsatellites recommended by ISAG for paternity/parentage testing. Heterozygosity of microsatellites ranged from 0.607 (SPS115) to 0.835 (TGLA227), and PIC from 0.575 (SPS115) to 0.816 (TGLA227) confirming a high polymorphism of each analysed locus. Their combined exclusion probability reached 0.999, which made them suitable and sufficiently accurate for parentage testing. A conflict between putative parents and calf in at least 2 markers with combined exclusion probability > 0.9 was required to reject parentage....
Effect of herd, parity, stage of lactation and milk yield on urea concentration in milk
F. Jílek, D. Řehák, J. Volek, M. ©típková, E. Němcová, M. Fiedlerová, R. Rajmon, D. ©vestková
Czech J. Anim. Sci., 2006, 51(12):510-517 | DOI: 10.17221/3971-CJAS
The objective of this study was to determine how non-nutritional factors such as herd, parity, days in milk, milk production, and milk components affect the concentration of milk urea. A retrospective, observational study comprising analyses of individual cow records from monthly dairy herd improvement milk tests including milk urea tests was conducted. Six commercial Holstein dairy herds were involved in the investigation from October 2000 to September 2003. The data were evaluated using the mixed linear model with repeated measures, and parameters were estimated by the REML method. Significant differences in milk urea concentrations were observed...
Responses of milk urea nitrogen content to dietary crude protein level and degradability in lactatingHolsteindairy cows
S.W. Zhai, J.X. Liu, Y.M. WU, J.A. YE, Y.N. XU
Czech J. Anim. Sci., 2006, 51(12):518-522 | DOI: 10.17221/3972-CJAS
Two experiments were conducted to investigate the effects of dietary crude protein level and degradability on milk urea nitrogen (MUN) content. In experiment 1, twelve multiparous lactating cows averaging 176 days in milk were divided according to DIM and milk production into three 4 × 4 Latin squares with four 2-week periods. Cows were fed four diets with different crude protein levels (13.0, 14.0, 15.0, and 16.0%, DM basis) with isocaloric, respectively. Crude protein levels had a low effect on milk yield and composition (P > 0.05), but a significant effect on MUN content. There were significant differences in the MUN content of cows...
Genetic correlations between racing performance at different racing distances in Thoroughbreds and Arab horses
M. Sobczyńska
Czech J. Anim. Sci., 2006, 51(12):523-528 | DOI: 10.17221/3973-CJAS
The purpose of this study was to find out whether abilities to win races of different distances are different traits. Data included information on 14 665 starts of 1 646 Thoroughbreds, aged 2 to 9 years and on 10 862 starts of 1 145 Arab horses, aged 3 to 10 years. The data comprised seven racing distances for Thoroughbred horses, i.e. 1 000, 1 200, 1 300, 1 400, 1 600, 1 800, >1 800 m, and five for Arab horses, i.e. 1 400, 1 600, 1 800, 2 000 + 2 200, >2 200 m. Placings at the finish (square root) of different racing distances were treated as different traits and analysed by a two-trait animal model. The highest heritability (0.16) was obtained...
Amino acid composition of pig meat in relation to live weight and sex
M. Okrouhlá, R. Stupka, J. Čítek, M. ©prysl, E. Kluzáková, M. Trnka, L. ©tolc
Czech J. Anim. Sci., 2006, 51(12):529-534 | DOI: 10.17221/3974-CJAS
The objective of this study was to find out the amino acid composition of pig meat in relation to live weight and sex. In total 80 (40 barrows/40 gilts) finishing pigs of the final hybrid kept in the Czech Republic [(CL × CLW) × (D × PN)] = [(Czech Landrace × Czech Large White) × (Duroc × Pietrain)] were used in this experiment. The pigs were slaughtered at the average age of 168-171 days after birth, at the average live weight of 112.2 kg. The samples of meat were taken from the musculus longissimus lumborum et thoracis (MLLT) 24 hours post mortem and subsequently subjected to the chemical analysis. As for the essential and semi-essential...
Determination of the effect of microbial transglutaminase on technological properties of common carp (Cyprinus carpio L.) meat
F. Vácha, I. Novik, J. ©pička, M. Podola
Czech J. Anim. Sci., 2006, 51(12):535-542 | DOI: 10.17221/3975-CJAS
The aim of this study was to evaluate the effect of microbial transglutaminase (TG) on processed meat of common carp (Cyprinus carpio L.). Three levels of microbial transglutaminase (0.5, 1.0 and 1.5%) combined with three levels of NaCl (0, 1 and 2%), added to support the binding reaction, were examined. For the evaluation of quality changes in restructured fish meat, we used the textural property hardness and water holding capacity (WHC). The results confirmed a strong improvement of texture and water holding capacity after the addition of transglutaminase and salt, whereas the addition of 1% TG + 1% NaCl seems to be the best combination...