Czech Journal of Animal Science, 2006 (vol. 51), issue 5
Fatty acids and composition of their important groups in milk fat of Czech Pied cattle
M. Pešek, E. Samková, J. Špička
Czech J. Anim. Sci., 2006, 51(5):181-188 | DOI: 10.17221/3927-CJAS 
In 2003, 2004 and 2005 milk fat composition was determined three times in 55 dairy cows of Czech Pied cattle housed in a byre with stanchions and fed under conditions usual on Czech production farms. Fatty acids were determined by a gas chromatographic method, 26 acids out of the total 37 acids observed in chromatograms were identified. The highest proportions were observed for palmitic acid (29.25 ± 2.98%), oleic acid (24.47 ± 3.27%), myristic acid (12.14 ± 1.80%) and stearic acid (8.91 ± 2.44%). The proportions of saturated, unsaturated and monounsaturated fatty acids were 64.71 ± 4.18, 31.96 ± 4.20 and 27.45...
Iodine concentrations in cow's milk in Central and Northern Bohemia
A. Hejtmánková, L. Kuklík, E. Trnková, H. Dragounová
Czech J. Anim. Sci., 2006, 51(5):189-195 | DOI: 10.17221/3928-CJAS
Iodine deficiency and related risks of medical and/or developmental disorders in humans are a worldwide problem. In the last years, Czech endocrinologists and paediatricians have observed a significant increase in the occurrence of goitre in children and adolescents caused by a low dietary intake of iodine. Given the low consumption of seafood, milk and dairy products are the main sources of iodine in theCzechRepublic. Iodine contents of milk of dairy cows of different breeds from seven farms located in Central andNorthern Bohemia were studied over a period of 17 months (April 2000 through August 2001). Iodine content was determined by high-performance...
Effects of fat-protein supplementation of diets for cows in early lactation on milk yield and composition
D. Strusińska, D. Minakowski, B. Pysera, J. Kaliniewicz
Czech J. Anim. Sci., 2006, 51(5):196-204 | DOI: 10.17221/3929-CJAS
An experiment was performed on 37 Holstein-Friesian cows during the first 120 days of lactation. The cows were fed balanced diets composed of haylage and maize silage (together 52% dry mater) and a concentrate containing 19% crude protein (group 1), a concentrate containing 17.5% crude protein and 1 kg of fat-protein supplement Megapro Plus® (group 2) or a concentrate containing 19% crude protein and 1 kg of fat-protein supplement Megapro Plus® (group 3). The mean daily milk yield recorded in groups 2 and 3 amounted to 32.6 kg/d and was by 10.3% higher than in the control group (P ≤ 0.01). FCM yield increased...
Effect of different agronomical measures on yield and quality of autumn saved herbage during winter grazing - 1st communication: Yield and digestibility of organic matter
W. Opitz Von Boberfeld, K. Banzhaf, F. Hrabe, J. Skladanka, S. Kozlowski, P. Golinski, L. Szeman, J. Tasi
Czech J. Anim. Sci., 2006, 51(5):205-213 | DOI: 10.17221/3930-CJAS
The objective of this paper was to obtain information about the effect of interactions and different agronomical measures on autumn saved herbage of different sites in Central Europe (Czech Republic, Germany, Hungary, Poland). Within the different sites, the effect of the factors pre-utilisation (accumulation since June, July or August) and winter harvest date (November, December or January) on dry matter (DM) yield and digestibility of organic matter (DOM) was investigated over three consecutive years. All results were examined by analysis of variance and least-significance differences (LSD) were calculated (with P < 0.05). For all years,...
Carcass quality in restricted and ad libitum fed rabbits
E. Tůmová, L. Zita, L. Štolc
Czech J. Anim. Sci., 2006, 51(5):214-219 | DOI: 10.17221/3931-CJAS
The effect of the length and intensity of feed restriction on carcass quality characteristics was studied in two experiments. In the first experiment rabbits were restricted 1 or 3 weeks. Group 1 was fed ad libitum, group 2 was restricted from 35 to 42 days of age (50 g per day/rabbit), group 3 was restricted from 42 to 49 days of age (65 g per day/rabbit), group 4 was restricted from 56 to 63 days of age (90 g per day/rabbit) and group 5 was restricted three weeks, from 35 to 42 days of age (50 g per day/rabbit), 42 to 49 days of age (65 g per day/rabbit) and from 56 to 63 days of age (90 g per day/rabbit). Rabbits were slaughtered at the...
Quality of semen and histological analysis of testes in Eurasian perch Perca fluviatilis L. during a spawning period
J. Krol, J. Glogowski, K. Demska-Zakes, P. Hliwa
Czech J. Anim. Sci., 2006, 51(5):220-226 | DOI: 10.17221/3932-CJAS
A qualitative assessment of the Eurasian perch Perca fluviatilis semen describing the basic parameters of seminal plasma was completed. The histological methods used in this study showed changes in perch gonads during a spawning and post-spawning period. At the late period of the spawning season, the structure of testes was clearly loosened and spermatozoa did not fill uniformly all the ampullae of the testes, leaving free spaces at their banks and no spermatids were observed. The results confirmed that there was an additional period after spawning in the annual reproductive cycle of the male Eurasian perch. In both years of investigations...