Correlation relationships of economic characteristics in black-and-white cattle

The present study has been carried out for obtaining comparative correlation data between productive and reproductive characteristics of the daughters of domestic and foreign breeding bulls in the modern black-and-white population of the Vologda region. The research is based on the works of domestic and foreign scientists and information databases on 10250 black-and-white cows of the 1st calving in the Vologda breeding farms. The statistical data has been calculated in the Microsoft Excel program.

Methods of creating highly productive meat herds

The article describes the results of a comprehensive study of the impact of using super-repair heifers from dairy cattle husbandry in combination with interbreeding on the basis of the best gene pool of meat breeds, which made it possible to form a highly productive meat herd in a short time. In this regard, there was a problem of increasing the efficiency of using the available breed resources and choosing the method of breeding cattle in a meat herd. To do this, it is necessary to use a rich gene pool and economically useful traits through interbreeding.

Biochemical blood status in the intact pregnant cows and in those infected with the bovine leukemia virus

The aim of the research is to determine the differences of biochemical blood parameters in the intact cows and in those infected with the bovine leukemia virus (BLV). The feeding and keeping conditions for the livestock of both the control and experimental groups were similar, provided by the technology of the farm. Studying the blood samples was performed using traditional laboratory diagnostics methods. The results of the study were processed using biometric methods with determining the level of confidence based on the Student’s criterion.

Influence of the polymorphism complex of κ-casein (CSN3) and prolactin (PRL) genes on the milk productivity of the holstein first calf heifers

The presented study is dedicated to the influence of the polymorphism complex of κ-casein (CSN3) and prolactin (PRL) genes, which are responsible for milk quality and milk productivity. The study was carried out among Holstein first calf heifers by Integrated Agricultural Production Centre “Breeding farm named after Lenin” of Atninsky district of the Republic of Tatarstan. DNA samples were separated from blood samples of 261 cows for identification and genotyping according to kappa-casein and prolactin genes by PCR-RFLP analysis method.

Specific measures to prevent helminthiasis in cattle in the Russian North-West non-black soil zone

The general measures of specific prevention of pasturable helmints in cattle based on the rich experience of personal experiments taking into account the species composition, ecology, epizootiology, biology of helmints are presented.

Ecological-Epizootic Monitoring of Helminth Infections in Cattle at Milk-Producing Farms of the Vologda Region

The data of monitoring studies of ecological-epizootic situation on the helminthoses of cattle at dairy farms of Vologda region have been given. The distribution of helminthoses depending on the natural - economic areas, seasonal and age dynamics of helminth infections, time period of helminth infection, associated invasions, the dependence of infected animals on the breed factor and on the animals keeping technology have been studied.

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