Czech Journal of Animal Science, 2005 (vol. 50), issue 3
Induced spawning in bream (Abramis brama L.) using pellets containing GnRH
D. Kucharczyk, R. Kujawa, A. Mamcarz, K. Targońska-Dietrich, E. Wyszomirska, J. Glogowski, I. Babiak, T. Szabó
Czech J. Anim. Sci., 2005, 50(3):89-95 | DOI: 10.17221/4000-CJAS 
Wild spawners of common bream, Abramis brama, were caught in the Kortowskie Lake (north Poland) and transported to a hatchery for artificial spawning. Fish were hormonally induced using GnRH analogue combined with metoclopramide (ovopel). The results of bream reproduction in captivity were compared with fish treated with the combination of hCG and CPE and with control group injected saline. Males from treated groups produced significantly more milt (over 4.3 ml/kg vs. 2.1) of better qualities: spermatozoon concentration (over 9.3 × 109 vs. 6.8) and motility (over 85% vs. 62). Females from the control group did not spawn whereas...
Genetic parameters for a joint genetic evaluation of production and reproduction traits in pigs
J. Wolf, E. Žáková, E. Groeneveld
Czech J. Anim. Sci., 2005, 50(3):96-103 | DOI: 10.17221/4001-CJAS
The covariance structure was estimated by REML for a joint genetic evaluation of production and reproduction traits for Czech Landrace (58 258 records) and Czech Large White (167 161 records) pigs using four-trait animal models. The following traits were analysed: lean mean percentage at the end of the performance test in the field, estimated from ultrasonic measurements unadjusted for live weight (LM), average daily gain in field test (in g/day) calculated as weight at the end of the test divided by age at the end of the test (ADG), number of piglets born alive in parity 1 (NBA1) and number of piglets born alive in parity 2 and subsequent parities...
Effect of some non-genetic factors on the growth of kids of the brown short-haired breed
J. Kuchtík, H. Sedláčková
Czech J. Anim. Sci., 2005, 50(3):104-108 | DOI: 10.17221/4002-CJAS
The evaluation of effects of some non-genetic factors (sex, litter size, age of dams and year of study) on the growth of 85 kids of the Brown Short-haired breed was carried out in a period of two successive years. The analysis of the growth of all kids revealed that in the time interval from birth to Day 90 of age daily gain and final body weight were 181.3 g and 19.52 kg, respectively. As far as the effect of sex was concerned, the intensity of growth was significantly higher in males than in females (P ≤ 0.01) in all periods under study. From birth to Day 90, the respective daily gains of males and females were 200.6 g and 162.0 g. As...
A comparison of carcass proportions in Czech Pied and Montbeliarde bulls with a high carcass weight
G. Chládek, J. Žižlavský, J. Šubrt
Czech J. Anim. Sci., 2005, 50(3):109-115 | DOI: 10.17221/4003-CJAS
The aim of the experiment was to compare the carcass composition of 20 Montbeliarde bulls (M) and 20 Czech Pied bulls (C). The carcass weight of the animals in one group varied minimally and was about 380 kg. The Montbeliarde bulls showed a higher growth rate, expressed by a significantly lower (P < 0.01) age at slaughter (562.6 vs. 626 days) while the live weight (682.9 vs. 690.6 kg) and carcass weight (380.4 vs. 382.6 kg) were comparable, which resulted in a significantly higher (P < 0.01) daily weight gain (1.142 vs. 1.045 kg) and net weight gain (0.676 vs. 0.615 kg). The Montbeliarde bulls showed a greater (P <...
Conformation and meatiness of pork belly
L. Vališ, J. Pulkrábek, J. Pavlík, M. Vítek, J. Wolf
Czech J. Anim. Sci., 2005, 50(3):116-121 | DOI: 10.17221/4004-CJAS
Based on the results of dissections of 126 pig carcasses, the proportions of pork belly and its parts, i.e. belly with bones, belly without bones and tip of belly, were determined. In addition, proportions of lean meat, bones, intermuscular and subcutaneous fat were determined in belly with bones as percentages of the weight before the dissection. Lean meat content of carcass was the most important factor for determining the pork belly composition. The correlation between lean meat content of carcass and lean meat percentage of belly with bones was 0.92 ± 0.035. Sex and slaughter weight had a greater impact on the composition of pork belly than...
Comparison of fatty acid composition in milk fat of Czech Pied cattle andHolsteincattle
M. Pešek, J. Špička, E. Samková
Czech J. Anim. Sci., 2005, 50(3):122-128 | DOI: 10.17221/4005-CJAS
In May 2003 differences in milk fat composition in two main dairy breeds in the Czech Republic, Czech Pied cattle and Holstein cattle, were studied in two uniform groups, each containing eight cows. The groups were housed together and received the same daily diet. Fatty acids were determined in mean milk samples from the individual cows as their methyl esters using a gas chromatography procedure. The groups of the fatty acids, namely saturated (SAFA), monounsaturated (MUFA) and polyunsaturated (PUFA) ones, were examined together with the individual acids. The milk fat of Czech Pied cattle was found to contain significantly less SAFAs than the fat of...
Effect of time of oviposition on egg quality characteristics in cages and in a litter housing system
E. Tůmová, T. Ebeid
Czech J. Anim. Sci., 2005, 50(3):129-134 | DOI: 10.17221/4006-CJAS
Two experiments were carried out to investigate the effect of the time of oviposition on egg quality characteristics in two different housing systems (cages vs. litter). ISA brown hens from 20 to 64 weeks of age were housed in battery cages (550 cm2/hen, 19 526 laying hens in the house) and on deep litter (7 hen/m2, 4 652 laying hens in the house). In both houses, eggs were collected daily at three oviposition times 06:00, 10:00 and 14:00 h. Every four weeks, 90 eggs for each house (30 eggs for each oviposition time) were used for egg quality assessment. The results indicated that in cages the highest percentages (P ≤...