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Lactogenesis

QuestionAnswer
Lactogenesis The initiation of milk synthesis and secretion
When does lactogenesis happen? The onset of calving
What initiates lactogenesis? The decrease in progesterone made by the placenta
When does calving happen? At 280 days
How does calving happen? The calf's hypothalamus begins to release CRH, which releases ACTH, which releases glucocorticoids
What do glucocorticoids have to do with calving? They release an enzyme that changes turns progesterone into estradiol
Steroidogenesis One steroid changes into another with the help of enzymes
Enzyme A protein that speeds up biological reactions. Can convert hormones
How does the cow become aware it is time to calf? The E2 released by the placenta causes prolactin to be released from the cow's pituitary
Lactogenic complex PRL and glucocorticoids initiate lactogenesis and ties it with the calf's birth
What causes contractions? Oxytocin
What happens to colostrum when the calf is born? It gets rapidly diluted
Milk let down The process of milk being ejected from the mammary gland
Neuroendocrine relfex arc Neurons interact with an endocrine pathway to stimulate milk let down
Explain the process of the neuroendocrine reflex arc Nerve impulses stimulate oxytocin release, aveoli contract and milk is pushed out of gland, down duct, and fills up teat cistern
Where are the places you can milk from? Between the legs or from the side
How long does it typically take to milk a cow? 10 minutes
Milk parlor designs Herringbone, parallel, rotary, or robot
Parlor turn How long it takes to fill up the parlor, milk the cows, and empty the parlor
How many parlor turns can you fit in an hour? 5
The pit Part in the middle where the people stand
Parallel parlor design Cows stand parallel on each side, opens in front and cows walk straight out, milk between the legs, empties quickly
Herringbone parlor design Cows come in at an angle, empties into an alley, milk from the side, empties slowly
Rotary parlor design Cows are in a circle that moves around, have to move backwards to get out
Robot/monobox Get the cow in the robot and have it milk the cow, can do about 60 cows
Created by: user-2052955
 

 



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