There are two parts to attaining good milk move: selling good milk let-down from the cow and shifting milk from the cow effectively.
Milk let-down can solely be capitalised on if the machine infrastructure and settings are adequate to deal with excessive milk move.
Maximising move by means of the machine is vital, not simply to attain a swift milking, but in addition to optimise the circumstances that the cows’ teats are uncovered to.
See additionally: 4 methods to enhance dairy milking routines
Vacuum on the teat finish is the results of system vacuum minus any leaks and losses. If the machine strikes milk away from the teat effectively, this vacuum will stay fixed all through milking.
Nonetheless, if the milking machine struggles to deal with excessive move charges from the cow, the vacuum on the teat finish will drop (see graph beneath © Advance Milking).
Milk move from the cow
Poor milk move away from the cow will result in decrease teat-end vacuum and trigger:
- Decrease compressive load on the teat when the liner is collapsed
- A shorter resting part brought on by the liner opening earlier and shutting later
- Elevated threat of teat-end oedema
- Extra alternative for “re-spray” of milk rinsing the teat
- A smaller vacuum gradient between the bottom of the teat and the liner beneath
- Slower milkings and larger udder an infection threat
Enhancing milk move away from the cow can scale back or remove the drop in vacuum and related issues.
The problem in detecting move points is that our regular static take a look at doesn’t give a dependable prediction of how the machine will operate with milk working by means of the system.
Some points will be checked by visible inspection, however to evaluate the influence of those components on teat-end vacuum a dynamic milking time take a look at should be carried out.
Areas to test
If a difficulty with milk move is detected, the important thing options are based mostly on mixing air into the milk, optimising formation of “slugs” of milk within the lengthy milk tube and lowering any restrictions within the milk path.
To work out which resolution is suitable, six areas have to be checked out:
1. Liner properties
Liner dimensions ought to present an excellent match to scale back threat of teat swelling. Compressive load ought to be adequate to counteract teat-end oedema.
Vented liners introduce extra air into the milk, enhancing move by means of restrictions.
2. Claw piece
Flooding of the milk claw bowl presents a ‘barrier’ to hoover reaching the teat. Utilizing a bowl with a bigger quantity may also help enhance move at teat degree.
Blocked air bleeds (and even small-diameter bleed holes) scale back the air content material of the milking and impair move from the bowl. To keep away from this, hold them clear and look ahead to extreme milk falling from the cluster at detachment.
3. Lengthy milk tube
Milk should kind slugs to journey by means of the lengthy milk tube, significantly in highline or midline methods.
The diameter of the lengthy milk tube impacts move: too slim, and there may be elevated resistance; too large, and the milk might not fill the tube to kind a slug.
Whereas slugs are vital, if they’re too massive, they’ll hamper move. Giant, drooping loops of lengthy milk tube improve slug dimension, lowering milk move and act as a barrier for the vacuum reaching the teat.
4. Milk path
Adjustments from large pipe to slim pipe will limit milk move. Bends of 90deg or 180deg will considerably improve resistance, particularly if the radius of the pipe on the flip is small. Kinks in tender tubing may even intervene with move.
5. Intentional disruptions
In-line filters considerably improve turbulence, appearing as a barrier to hoover being transferred additional by means of the lengthy milk tube.
Milk-sampling ports could have an analogous impact if left in place completely. And even milk meters can influence on milk move charges, affecting vacuum at cow degree.
6. Plant design
Milk line peak is a key consider how difficult it’s to maneuver milk away from the cow: the upper the road the extra probably we’re to see issues with milk move.
Pulsation sort can have an effect on milk move, for instance, 4-0 pulsation will increase the quantity of milk that must be moved by means of the claw piece and lengthy milk tube at anybody time.
Flooding of the milk line is disastrous for vacuum at cow degree and will be brought on by too many milking items coming into a single line, inadequate pipe diameter or incorrect slope.
Vacuum reserve and regulator place might have an effect on the flexibility and velocity of the system to answer modifications in vacuum at cow degree.
Tom Greenham is a director of Advance Milking, a consultancy service for all facets of udder well being and milking machine efficiency.
Advance Milking works with dairy farms throughout the UK and Eire to optimise udder well being, milk high quality and milking effectivity.
Mr Greenham additionally gives analysis, coaching, and impartial help to the dairy business internationally.