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* Testes under the influence of [[Endocrine_System_-_Pituitary_Gland_-_Anatomy_%26_Physiology#Hormones_of_the_Anterior_Pituitary_Gland|FSH and LH]].
 
* Testes under the influence of [[Endocrine_System_-_Pituitary_Gland_-_Anatomy_%26_Physiology#Hormones_of_the_Anterior_Pituitary_Gland|FSH and LH]].
* '''Leydig cells''' produce Testosterone and Androstenedione under the influence of '''[[Endocrine_System_-_Pituitary_Gland_-_Anatomy_%26_Physiology#Hormones_of_the_Anterior_Pituitary_Gland|LH]]'''.
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* '''Leydig cells''' produce Testosterone and Androstenedione under the influence of [[Endocrine_System_-_Pituitary_Gland_-_Anatomy_%26_Physiology#Hormones_of_the_Anterior_Pituitary_Gland|LH]].
 
** Provide '''secondary sex characteristics''':
 
** Provide '''secondary sex characteristics''':
 
*** Coloration
 
*** Coloration
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*** Plumage and Bill colour
 
*** Plumage and Bill colour
 
** Testosterone increases spermatogenesis and growth of accessory reproductive organs.
 
** Testosterone increases spermatogenesis and growth of accessory reproductive organs.
* FSH initiates growth of semniferous tubules and results in increased spermatogenesis.
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* [[Endocrine_System_-_Pituitary_Gland_-_Anatomy_%26_Physiology#Hormones_of_the_Anterior_Pituitary_Gland|FSH]] initiates growth of semniferous tubules and results in increased spermatogenesis.
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