Czech Journal of Animal Science, 2005 (vol. 50), issue 7
Changes in boar semen with a high and low level of morphologically abnormal spermatozoa
J. Čeřovský, S. Frydrychová, A. Lustyková, M. Rozkot
Czech J. Anim. Sci., 2005, 50(7):289-299 | DOI: 10.17221/4170-CJAS 
The aim of the paper was to find out the level of changes in the sperm quality in two groups of boars in the insemination (A and B) with diametrically different contents of morphologically abnormal spermatozoa (AS) with an interval of 25 weeks between semen collection I and collection II. In the group A there were 22 boars with the AS content up to 10%, in the group B 16 of boars with the AS content above 40% in collection I. Both groups were comparable concerning the parameters of the performance test results and in quantitative parameters of the semen from collection I. They differed significantly in the AS content (P < 0.01) and in the...
Improvement of developmental competence of aged porcine oocytes by means of the synergistic effect of insulin-like growth factor-1 (IGF-1) and epidermal growth factor (EGF)
I. Petrová, R. Rajmon, M. Sedmíková, Z. Kuthanová, F. Jílek, J. Rozinek
Czech J. Anim. Sci., 2005, 50(7):300-310 | DOI: 10.17221/4171-CJAS
There is a constant increase in demand for large numbers of high-quality oocytes of domestic mammals for various reproductive biotechnologies. Prolonged in vitro culture represents one of the many possible ways of meeting this demand. However, oocytes further cultured in vitro after reaching the stage of metaphase II undergo the complex process called "ageing", which decreases the quality of oocytes. The aim of the present study was to improve the culture conditions for in vitro matured porcine oocytes by supplement of the epidermal growth factor (EGF) or the insulin-like growth factor 1 (IGF-1) in order to reduce the adverse...
Fatty acid content in milk of dairy cows on a diet with high fat content derived from rapeseed
T. Komprda, R. Dvořák, M. Fialová, K. Šustová, A. Pechová
Czech J. Anim. Sci., 2005, 50(7):311-319 | DOI: 10.17221/4172-CJAS
Two groups of dairy cows, Czech Red-pied × Ayrshire × Red Holstein crossbreds, received a diet with either production mixture with rapeseed, rapeseed cakes and rapeseed oil (Energol; E-group; final feed mixture with 62 g of crude fat per kg of dry matter, DM) or control production mixture (C-group; crude fat content in total feed mixture 37 g/kg DM). Milk samples were taken on the 14th, 30th, 60th and 90th day of lactation, and basic milk constituents and fatty acid content in milk fat were determined. E- and C-groups did not differ in either milk yield or yield of milk fat, milk protein and lactose (P...
In sacco NDF degradability and mineral release from selected forages in the rumen
Z. Čerešňáková, P. Fľak, M. Poláčiková, M. Chrenková
Czech J. Anim. Sci., 2005, 50(7):320-328 | DOI: 10.17221/4173-CJAS
An in sacco technique was used to measure NDF degradability and release of Mg, Ca, Zn, Cu, Fe from six forages - lucerne hay from the 1st cut (LH1), from the 2nd cut (LH2), orchard grass (G), grass silage (GS), red clover silage treated with Feedtech (CSFT) and/or with Kofasil (CSKO). The forages differed in the content of NDF and minerals. There were large differences (P < 0.01) in element release in the rumen between experimental forages and the particular elements. The rate of release of elements was higher from LH1, LH2, CSFT,CSKO...
Growth analysis of chub, Leuciscus cephalus (L.), and dace, Leuciscus leuciscus (L.), in the Úpoř stream using growth data of recaptured marked fish
P. Vlach, J. Dušek, M. Švátora, P. Moravec
Czech J. Anim. Sci., 2005, 50(7):329-339 | DOI: 10.17221/4174-CJAS
The length growth of chub and dace was observed. The scale method was used as well as data gained from recaptured individuals which were marked with visible elastomer tags and platinum wire tags with a coloured code placed under the first bony ray of the dorsal fin. The length-weight relationship for chub could be explained by the equation w = 0.00001.l 3.067 (r2 = 0.96). The average condition coefficient reached 1.49. The growth was balanced, gradually slowing down. Von Bertallanffy growth equation had the form Lt = 245.47(1 - e-0.206(t + 0.0333)). The...