1. Continued Following initial presentation or Video
LACTATION
Continued
Following initial presentation or Video

2. REVIEW External Anatomy Attachments Teats
Differences between quarters (rear=60%)

3. Udder size
Does it matter?

4. Abnormalities Accessory teats Common
Best removed (make sure it’s the right one)
If present, may interfere or cause infection

5. Internal Anatomy Streak Canal Teat cistern Gland cistern Duct system
Secretory cells (alveoli)
Blood and nerve supply
Myoepithelial cells

10. Milk Letdown – Neurohormonal
Nerve side =
Hormone side =

11. Interruption of Milk Letdown
Epinephrine interferes with oxytocin effect
Myoepithelial cells relax
Factors
Loud noise Dogs Sores
Strangers teat cups irregular feed

12. Machine milking Vacuum level 10-16 mm Hg
Pulsator alternates outer chamber to inner (vacuum to normal air pressure)
48-52 pulses / min
Prevents blood congestion in teat

14. Udder development Before puberty – somatotropin Estrogen
Causes duct growth (and heat [estrus])
Secreted by ovaries
Stimulates growth & branching of ducts
Ducts increase with each heat period
Increases blood supply to udder

15. Progesterone
Secreted by Corpus Luteum
Duct AND alveolar growth

16. Prolactin Enlargement of ducts & alveoli
Stimulates secretion (precolostrum)
From anterior pituitary
Lactation curve is dependent on prolactin

17. Good Milking Technique
By National Mastitis Council
Wash udder with warm sanitizing sol’n
Dry with single service paper towel
Remove 2 – 3 streams of milk from each quarter and examine for abnormalities
Attach teat cups ~ 1 min after starting udder prep – or when teats full of milk

18. Adjust teat cups during miling as necessary to insure quarters milk out properly
Start machine stripping when milk flow slows (3 – 4 min). Do NOT OVERMILK
Dip teats in a teat dip after teat cups removed
Treat all clinical cases of Mastitis
Treat cows at drying off
Conduct cowside screening test (CMT – Calif. Mastitis Test) at monthly intervals. Record results.

20. Have the entire milking machine system analyzed twice a year by a qualified milking machine service man.