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Reprodukce a management chovu vybraných plemen masného skotu
NÁVAROVÁ, Eliška
The literature review presented in the bachelor thesis focuses on the ma-nagement and characterization of cattle breeding, specifically the Aberdeen Angus, Limousin, and Charolais breeds. The following chapter describes ecological ag-riculture, as the thesis includes companies that breed cattle in organic farming. The upcoming chapter of the thesis centers on the reproduction of beef cattle breeds. The aim of this thesis was to conduct a comprehensive and continuous analysis throughout the year by which to evaluate the level of reproduction and ma-nagement. The practical part focuses on evaluation the course of delivery, pregnancy diagnosis results, weight of calves at birth and weaning, and the results from semen examination. The data for this thesis were collected from six companies using ac-companying lists of cattle, animal husbandry records, and bull spermograms. In the conclusion of the thesis, the results are summarized and evaluated. Companies specializing in Limousin and Charolais breeding include their bulls in herd for approximately two months. The company that focuses on breeding Aberdeen Angus has its bulls in herd for most of the year. More frequent occurrence of difficult births was recorded for the Limousin breed at the Rolnická Skalná company, and their number significantly exceeded the average incidence of complicated births for this breed. A higher incidence of di-fficult births was also analyzed for the Charolais breed at the SPO-ZEM Nový Kos-tel company. The number of difficult births recorded at the company specializing in breeding Aberdeen Angus slightly exceeded the breed's average. The highest success rate of pregnancy was found in the companies SPO-ZEM Nový Kostel, Farmy Třebeň, and Anonymu. The Naturland company achieved unsatisfactory levels of pregnancy rates. Companies breeding Limousin achieved lower birth weights, nonetheless the values were satisfactory. Weaning weights of calves in these companies were suita-ble. Companies focused on breeding Charolais achieved unsatisfactory average birth weight values but excellent weaning weight values. For the Aberdeen Angus breed, satisfactory average weaning weight was achieved for heifers, while the weight of bulls was lower than usual for the breed. From the total of 12 monitored bulls, all were fertile at the beginning of the breeding season, infertility was diagnosed in three bulls, and one bull had a high number of immobile spermatozoa. In these bulls, a treatment was applied, which was found to be effective only in two breeding males after the third collection. Bulls for which the treatment was ineffective were removed from the breeding pro-gram.
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Analýza reprodukce dojeného skotu
RAKOUSKÁ, Barbora
The diploma thesis deals with the evaluation of reproductive indicators in two companies with cattle breeding. Furthermore, evaluation of the effect of the synchronization program on the reproduction of dairy cattle, the effect of lactation on reproduction and comparison of the results with the national average.
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Faktory ovlivňující délku gravidity u dojeného skotu
Vintrlíková, Daniela
In my thesis I focused on analysis lenght of gestation of breeding cows in period from 2014 to 2017. Monitoring was on farm in Velké Němčice, where are breed first of all Montbeliard and Holstein breed. There are cross with breed of Jersey, Red Holstein and Brownswiss. Lenght of gestation was influence by series of factors during the watched period. Partial influence on the lenght of gestation had years and month of breeding cow. The smallest lenght of gestation was in summer months, when effect of heating stres was the biggest. The most of lenght of gestation was influenced by breed of breeding cows and line of bulls, that was used to their insemination. Difference of lenght of gestation among individuals breeds of breeding cows and line of bulls used to their insemination was significant. Lenght of gestation was influenced by rank of laktation of breeding cow, sex of birth of calf and twins. From result of monitoring is evident, that lenght of gestation is influenced by lot of factors, that should not be underestimate by breeder.
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Hodnocení ukazatelů reprodukce v chovu vysokoprodukčních dojnic
Pokorná, Veronika
In this bachelor's thesis with name Evaluation idicators reproduction in the breedeing of high-yield dairy cows, I deal with issues of reproduction in these cows. Good to know and evaluate reproduction indicators is the foundation of a good level of breeding. I deal with this one in first part, this are described biological and physiological patterns of reproductive cycle. In second part are described possible methods of detecting estrus. Timely retrieval and correct determination of the optimal time of estrus plays a major role in the success of conception. Also here I discuss how the cows are suitable for reproduction, methods and techniques of insemination. Much depends on the timely implementation of insemination that subsequently became pregnant cows. In third part are described the period from conception through birth until postnatal period. Their findings, control and treatment. Mastering of these will affect the lactation period and restoration of full-fledged ovarian cycle and expression of oestrus. In fourth part, I deal with influences affecting the level of reproduction, their causes, consequences and prevention. Among the most important influences include stabling technologies, thermal stress, nutrition and condition of the animal. In the last fifth section outlines the most widely used biotechnological methods in breeding cattle.
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