Artificial Induction of Lactation in Dairy Cows: A Review
Yousuf Dar Zulfqar Ul Haq Asif Ahmad Bhat Adil Majid Bhat
Vol 7(3), 1-9
This review aims to highlight the role of estrogen, progesterone, prolactin, somatotropin and thyroproteins in lactogenesis. During normal lactogenesis, progesterone concentrations in plasma begin to decrease approximately one week before parturition, and estrogen concentrations, already elevated during pregnancy, start to increase dramatically during the final weeks before calving. Glucocorticoids also play a role in mammary gland development leading to alveolar cell differentiation of the gland. Administering glucocorticoids to non lactating cows with a developed mammary gland aids in the induction of lactation. It is believed that the increase in circulating glucocorticoids at parturition is a necessary factor in initiating lactogenesis, thus leading to examine the addition of exogenous synthetic glucocorticoid viz. dexamethasone to induction protocols. Studies have been conducted to develop reliable cost efficient protocol like estrogen/progesterone protocol to artificially induce lactation in non breeder cows. Somatotropin and thyroproteins offer a limited scope for long term artificial induction of lactation. Currently, steroid-based induced-lactation protocols are illegal because of concerns regarding consumer safety and presence of hormones in milk.
Keywords : Cortisol Estrogen Progesterone Prolactin
Read : 681
Downloads : 108