Back to: Animal Husbandry SS 2
MAIN REPRODUCTIVE HORMONES AND THEIR FUNCTIONS
Hormones are chemical substances which co ordinate the activities of the body. They are secreted by ductless glands in the body and transferred through the blood to the target organs on which they exert their effects. Hormones concerned with reproduction in farm animals can be grouped into male and female reproductive hormones.
Male Reproductive Hormones aid d Androgen (Testosterone)
Functions
It initiates spermatogenesis (sperm formation).
It is responsible for the initiation of male secondary sex characteristics.
It maintains the sex drive (libido).
It enhances muscular and skeletal growth.
It reduces fat deposition.
It promotes the growth of accessory sex glands.
It sustains the life of sperms in the epididymis.
(1) Female Reproductive Hormones Zero Oestrogen
(I) It stimulates the development of female lop secondary sex characteristics, e.g., heat guiai behaviour.
(Ii) It promotes the production of eggs nots through oogenesis.
(iii) rock It is concerned with the preparation of 280 the uterus lining for the reception of the fertilised ovum
It increases blood supply as well as the elovo water content of the uterus.
It stimulates the growth of the duct way system in the mammary glands (udder).
In the oviduct, it increases cilliary activities and mucous secretion.
(vii) It induces the rapid multiplication of aniwepithelum in the vagina.
(2) Follicle Stimulating Hormone (FSH)
(i) It stimulates the growth of the ovarian follicle.
(3) Luteinising Hormone (LH)
(I) It causes the rupture of the follicle and subsequent release of ova (i.e ovulation).
(Ii) It stimulates the secretion of ovarian hormones i.e. oestrogen and progesterone.
(4) Progesterone (Pregnancy hormone).
(i) It ensures the development of uterus and implantation of the fertilised ovum.
(ii) It inhibits oestrus (i.e., it prevents the ripening of more follicles).
(iii) It causes the development of alveoli in the mammary gland.
iv) It ensures the continuance of pregnancy.
5) Oxytocin
(I) It aids in the contraction of the female uterine muscles during pregnancy.
(Ii) It affects the mammary gland after birth by causing milk let-down or milk production.
(iii) It promotes the transport of spermatozoa in the female genital tract.
(6) Relaxin
(i) It causes the relaxation of the pelvic ligament during parturition for easy passage of the young ones.
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