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=== Oestrogens ===
 
=== Oestrogens ===
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* Used to induce oestrus in anoestrous animals.
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* Have a direct effect on oestrus behaviour and the genital tract.
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* May inhibit the pituitary release of gonadotrophins in high doses.
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* Do not initiate ovarian activity or ovulation.
    
=== Progestogens ===
 
=== Progestogens ===
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