[Hormonal changes in blood of cows at retention of placenta and subinvolution of uterus]
2007
Ivashkevich, O.P. | Botyanovskij, A.G., National Academy of Sciences. Scientific and Practical Center of Animal Breding (Belarus). The S.N. Vyshelesskij Inst. of Experimental Veterinary Medicine
Sharp decrease in concentration of progesterone in blood of cows directly ahead of calving is a necessary condition of successful delivery. Generalizing the obtained data it is possible to conclude, that high values corticosteroids in closing dates of pregnancy correspond with the maximum indicators of oestradiol in blood of normally calved cows. Such parity of steroid hormones provides the mechanism of successful childbed and separation of placenta after birth. Considering as a whole the cited data, it is possible to conclude, that detention of placenta after birth completely not necessarily should be a consequence of infringement of sexual organ function. Apparently, in etiopathogenesis this pathology radical changes of very difficult complex of stabilising mechanisms which coordinate ability of an organism to support a constancy of own environment lay. As stress factors, causing these changes, there can be errors in feeding, the maintenance of animals, various diseases, medicinal loadings, childbirth etc. However, depending on level of resistance of the organism, degree of adaptation of animals to same stress factors is various. Therefore from all number of the cows who are in identical conditions, detention of placenta after birth is observed only at separate animals. The revealed laws can form a basis for working out and a choice of means of therapy and preventive of detention of placenta after birth and a uterus subinvolution at cows
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