Straty ciążowe w okresie zarodkowym u bydła
Anna Świątek , Adam Okólski
AbstractThe aim of this paper was to present the problem of early pregnancy losses in cows, an important problem in cattle obstetrics. Embryo mortality significantly reduces the animals fertility. This problem affects all species of livestock. The percentage of embryonic losses varies in livestock: in pigs reaches 30–50%, in sheep 20–30%, in horses 15–24% and in cattle can be as high as 45–65%. This biological problem strongly influences the economy of milk production. Relatively not many embryos die before 8th day after insemination. It is estimated that 70–80% of all embryo mortality cases takes place between 8 and 16 days of gestation. Embryonic death is a result of complex process influenced by many factors. They include condition, milk yield and hormonal profile of cow, the quality of gametes as well as the synchronization between mother and embryo and also existing genetic and immunologic defects. It is difficult to determine embryonic death in cows under field conditions. The problem of early losses of pregnancy is a consequence of breeding program oriented on the increase of cattle productivity and it can’t be easily solved.
|Other language title versions||Early pregnancy losses during embryonic period in cattle|
|Journal series||Życie Weterynaryjne, ISSN 0137-6810, [1689-0299], (B 4 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||embryonic death, gestation, cows.|
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