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Metody reprodukce využitelné v chovu masného skotu
Střecha, Filip
This thesis entitled "reproduction methods usable in breed of beef cattle" describes the most commonly used reproductive techniques at herds of beef cattle. Breeders implement the bovine reproduction mostly through natural breeding and insemination. The first part of this thesis is devoted to the breeding of bulls, their selection and bonitation. Further, the effect of a bull in a herd is introduced, its classification and the main principles of bull breeding. In the second part the thesis deals insemination. It describes the creation of an insemination dose, its consequent long-term storage and the insemination of cows. The possibilities of influencing the gender and correct timing of insemination are have briefly summarized. The third section introduces the technique of embryo transfer. It describes a stimulation of superovulation, preparation of donors and recipients, flushing of embryos, long-term preservation of embryos and their subsequent transfer. In the fourth section bull catalogues of the Czech Republic, France and Ireland are compared. The individual parts of the cataloques and differences between them are described there. The last part is the assessment of the individual reproductive indicators published in the Czech Republic. The six largest breeds is compared here, and in some consideration beef cattle is compared across all breeds. We evaluates the length of the interim period with respect to the age of a cow, its age at first calving, the percentage of live born of calves and the part of various systems used during ensuring the the reproduction in the herd.
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Výživa plemenných býků
KOUBA, Jindřich
The aim of this thesis was the study of available publications covering the topic of breeding bulls nutrition, the analysis of the feed dose and the evaluation of the semen quantity and quality after addition of extruded flaxseed (EL) to the feed dose. 200 semen samples from 8 breeding bulls of the Czech Fleckvieh were proposed as the subject of observation. The influence of EL to the sperm motility and concentration and to the amount of semen was observed and evaluated. The positive effect was found out in all of the observed characteristics. Experimental group showed increase in the amount of semen in comparison to the control group, and the statistical analysis displayed a significant difference in the effect of the time factor (effect of the addition of EL) on the amount of semen within the groups. The sperm concentration in 1 mm3 of semen of the experimental group increased compared to the control group, but the difference was not statistically significant. The experimental group showed an increase in sperm activity and the time factor was statistically significant. From the results of this thesis follows that extruded flaxseed can be recommended as the suitable feed supplement for breeding bulls.
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Evaluation of sire rearing results of beef cattle breeds
STRNADOVÁ, Eva
During the work, results of ten sires of beef breeds had been observed in OPB Cunkov s.r.o. Over the years 2004 to 2007, 590 pieces of animals was evaluated. The highest number of all the evaluated sires was at the breed charolais (211 pieces), with average daily gain of 1883 grams, which was the highest daily gain from all the breeds evaluated. Of all the number of bulls included, 81,7% of them was included in breeding process and 18,3% of them was negative selected. Rearing house is an important means the other progress of beef cattle breeding.
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