name
Petkevich Nikolay Semenovich
Scholastic degree
•
Academic rank
—
Honorary rank
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Organization, job position
• Smolensk state agricultural academy
профессор кафедры зоотехнии
Research interests
разведение, генетика, селекция и воспроизводство молочного и молочно-мясного крупного рогатого скота
Web site url
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Articles count: 1
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06.00.00 Agricultural sciences
Description
The article presents a study of acclimatization characteristics and the effectiveness in the use of Holstein black-and-white cattle imported from Germany, Denmark and the USA under the conditions of the Central Non-Black Soil Area of Russia. The analysis shows that the imported animals are exposed to a number of stress factors that often cause the diseases and serious losses of cattle. The main reasons for the losses of heifers were the pathologies of the reproductive organs and the mammary gland (26,3%), locomotor system and distal extremities (15%), respiratory organs (21,2%), etc. The highest-producing dairy cows were those imported from the USA (9158 kg of milk throughout the first lactation). For the yield of milk, they are superior to animals imported from Germany in 1828 kg (P≥0,999) and those imported from Denmark in 1184 kg (P≥0,999). The average American Holsteins’ milk over a 305-day lactation is higher in fat (4,14%) than that of their German (in 0,28%) and Danish (in 0,21%) counterparts (P≥0,999). The same tendency is observed in the protein content in the milk
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