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| − | <big><center>[[Reproductive System|'''BACK TO REPRODUCTIVE SYSTEM''']]</center></big>
| + | #redirect[[Intersex#Abnormalities of chromosomal sex]] |
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| − | <big><center>[[Reproductive_System#Fertilisation.2C_Implantation_and_Early_Embryonic_Development|'''BACK TO FERTILISATION , IMPLANTATION and EARLY EMBRYONIC DEVELOPMENT''']]</center></big>
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| − | <big><center>[[Fertilisation%2C_Implantation_and_Early_Embryonic_Development_-Sexual_Differentiation-_Anatomy_%26_Physiology#Associated_Disorders|'''BACK TO SEXUAL DIFFERENTIATION''']]</center></big>
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| − | == Aetiology ==
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| − | * Occurs in Mares
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| − | * X0 sex chromosome complement
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| − | * Normal autosomal chromosome complement
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| − | * Develop an ovary
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| − | * There is only one active X chromosome, so Oocytes die.
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| − | * The death of Oocytes is followed by loss of follicles.
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| − | * This leads to Ovarian Dysgensis (abnormal development) and a highly regressed Streaky Ovary that does not secrete the normal ovarian steroid hormones.
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| − | * The Ovary therefore lacks tone and has no follicular cycles.
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| − | == Morphology ==
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| − | * Normal external genetalia
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| − | * Small stature
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| − | * Flaccid Uterus
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| − | * Small, inactive Ovaries
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| − | * Complete absence of Ovarian activity and consequent Anoestrous
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