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...to start reading this article please click on here...Agenesis It is a failure of living bodies to reproduction, and it occurs in both females and males. The causes of agenesis are probably chromosome and genic anomalies which are very difficult to diagnosticate and at times even impossible to treat. And it is no use getting the offspring from such individuals. The main cause of agenesis in females is hysteritis or genital tracts. Growths and different anatomic defects of reproductive system also prevent occurrence of pregnancy. A serious problem is a very long retention of estruses or a total absence of them. If female does not have estrus for 1.5 year, she should be examined by a veterinarian. Prolonged estruses are dangerous too, i.e. very often are connected with oothecomae. In this case excessive production of estrogens takes place with the result that estrus lasts for weeks and months....to continue reading this article please click on here...