Czech Journal of Animal Science, 2005 (vol. 50), issue 1
Relationship between longevity and selected production, reproduction and type traits
P. Strapák, J. Candrák, J. Aumann
Czech J. Anim. Sci., 2005, 50(1):1-6 | DOI: 10.17221/3989-CJAS 
The correlations between longevity, functional longevity, stayability and selected milk, reproductive and type traits were estimated; it was done on the basis of estimated breeding values for longevity, functional longevity, dairy traits, reproductive traits and stayability rates at the age of 60, 72, 84, and 96 months. The correlation between breeding values for longevity and functional longevity was 0.69. The correlations between longevity and stayability at 60, 72, 84, and 96 months of age were around 0.75 (from 0.73 to 0.76) whereas the correlation with stayability at 48 months was considerably lower (0.64). The breeding values for dairy traits...
Definition of subgroups for fixed regression in the test-day animal model for milk production ofHolsteincattle in theCzech Republic
L. Zavadilová, E. Němcová, J. Přibyl, J. Wolf
Czech J. Anim. Sci., 2005, 50(1):7-13 | DOI: 10.17221/3976-CJAS
The investigation was based on roughly 3.9, 2.7 and 1.7 million test-day records from first, second and third lactation, respectively, sampled from 596 200 Czech Holstein cows between the years 1991 and 2002. Breeding values were estimated from multi-lactation random-regression test-day models which contained the fixed effect of herd-test day, fixed regression on days in milk and random regressions on the animal level and the permanent environmental effect. Third degree Legendre polynomials (with four coefficients) were used for both the fixed and random regressions. The models differed in fixed regression. In Analysis I, 96 subclasses were defined...
Factors affecting growth traits of beef cattle breeds raised inSlovakia
E. Krupa, M. Oravcová, P. Polák, J. Huba, Z. Krupová
Czech J. Anim. Sci., 2005, 50(1):14-21 | DOI: 10.17221/3990-CJAS
Growth traits of purebred calves of six beef breeds (Aberdeen Angus - AA, Blonde d'Aquitaine - BA, Charolais - CH,Hereford - HE, Limousine - LI and Beef Simmental - BS) born from 1998 to 2002 were analysed. Traits under study were birth weight (BW), weight at 120 days (W120), weight at 210 days - weaning weight (WW), weight at 365 days - yearling weight (YW) and average daily gains from birth to 120 days (ADG1), from birth to 210 days (ADG2), from birth to 365 days (ADG3), from 120 to 210 days (ADG4). General linear model with class effects of breed, dam's age at calving, sex, herd-year-season (HYS) and covariation of age at weighing was used for analyses....
Model parameters of growth curves of three meat-type lines of Japanese quail
M. Sezer, S. Tarhan
Czech J. Anim. Sci., 2005, 50(1):22-30 | DOI: 10.17221/3991-CJAS
This study was focused on a comparison of the growth characteristics and parameters of three meat-type lines of Japanese quail. The body weight data of wild-type, dotted-white and extended-brown quail lines over time were collected and fitted to Richards equation. The relevant parameters were compared based on the Confidence Interval Test. Confidence Interval Test calculates the percentages of model predictions staying in the confidence intervals of the corresponding experimental data. Both sexes of brown quails showed lower weight gains than the other two lines. Behind the inflection point a decline in the absolute growth rate was slowest for brown...
Effect of dietary esterified glucomannan on performance, serum biochemistry and haematology in broilers exposed to aflatoxin
H. Basmacioglu, H. Oguz, M. Ergul, R. Col, Y.O. Birdane
Czech J. Anim. Sci., 2005, 50(1):31-39 | DOI: 10.17221/3992-CJAS
The amelioration of aflatoxicosis in broiler chickens was examined by feeding two concentrations of yeast component (esterified glucomannan; EG). EG, incorporated into the diet at 0.5 and 1 g/kg, was evaluated for its ability to reduce the detrimental effects of 2 mg total aflatoxin (AF; 82.72% AFB1, 5.50% AFB2, 10.20% AFG1 and 1.58% AFG2) in diet on growing broiler chicks from 1 to 21 d of age. A total of 240 male broiler chicks (Ross-308) were divided into 6 treatment groups [control, AF, EG (0.5 g/kg), AF plus EG (0.5 g/kg), EG (1 g/kg), and AF plus EG (1 g/kg)]. Compared to the control, AF treatment significantly...
Effects of supplemental phytase on nutrient excretion and retention in broilers fed different cereal based diets
J. Pintar, B. Homen, K. Gazić, Z. Janječić, M. Sikirić, T. Černy
Czech J. Anim. Sci., 2005, 50(1):40-46 | DOI: 10.17221/3993-CJAS
A 21-day experiment with day-old broilers was conducted in order to assess the effect of phytase supplementation to different cereals-soybean meal based diets on nitrogen, calcium, total and phytate phosphorus excretion and retention. Diets were formulated to contain 4 different cereals (maize, wheat, triticale and barley), 2 levels of dietary calcium (0.6 and 1.0%) and 3 levels of supplemental phytase (0, 500 and 1 000 PU/kg). Nutrient intake, excretion and retention were determined in the first three days of the 2nd and 3rd week of trial. The increasing phytase level resulted in reducing phytate phosphorus excretion and increasing its retention....