When the Robotic Milker Underperforms: What to Check First

A robot that falls short of expectations can be frustrating, because the machine looks fine and the cows seem healthy. Yet milkings per cow are low, the fetch list keeps growing, and someone is spending hours a day pushing cows toward the robot. Before calling for a technician or blaming the cows, work through a simple order of checks. This guide draws on University of Wisconsin Extension articles on automatic milking systems (AMS) and is a general approach. Your dealer, nutritionist and vet should each look at their own part of the picture.

Start with the fetch list

Fetch cows are animals brought to the robot because they exceed set criteria, such as time since last milking or expected yield. A University of Wisconsin Extension article on encouraging voluntary visits in automatic milking systems reports that one study found AMS farms fetched about 4 percent of the herd per robot per day, roughly three cows, although surveys ranged from 4 to 25 percent. In one Tennessee farm study, 80 percent of the herd appeared on the fetch list at least once over seven months, but only 5 percent on any given day. Farmers estimated about 50 minutes a day per robot spent fetching, with a range from 5 to 120 minutes.

That gives you a yardstick. If your list is far above the typical range, or the same cows keep appearing, something is wrong. Wisconsin's best-practices article on fetching cows suggests treating a repeat fetch as a signal to investigate rather than a chore to repeat. It asks whether the cow is sick, whether she is more timid than others, and whether she has had consistently negative experiences at the robot.

Check 1: Cow health, especially feet and udders

The Wisconsin article reports that lame cows in AMS herds were about 2.2 times more likely to be fetched, were milked less often and produced less milk. It also reports that each 5 percent rise in clinically lame cows was associated with a drop in milk per cow per day of about 2.2 pounds. Mastitis can alter milking frequency up to a week before diagnosis, and mastitis, metritis and ketosis all raise the chance that a cow lands on the fetch list.

So the first walk should be through the fetch cows themselves: look at feet, udders, body condition and attitude. Review health and SCC records. Our guides on lameness and hoof care and mastitis are good starting points. Hoof trimming, footbaths and flooring come first in Wisconsin's list of priorities.

Check 2: Feed and pellets

In a robot barn, feed does a lot of the work of getting cows to visit. Wisconsin reports several findings worth discussing with your nutritionist:

• Robot concentrate often displaces partial mixed ration (PMR) intake: cows ate 0.5 to 1.5 pounds less PMR per pound of robot concentrate consumed.
• Moving pellets from the PMR to the robot raised voluntary milking frequency in one free-flow herd.
• Higher non-fiber carbohydrate content in the PMR was linked to slightly lower milking frequency.
• Simply adding robot concentrate without changing the PMR did not consistently increase visits.
• Each five extra feed pushes per day was associated with an average gain of 0.77 pound of milk per cow per day.

Fresh feed and frequent push-ups keep cows moving around the barn. See our guide to TMR and ration basics for how to talk to a nutritionist about it.

Check 3: Stocking density and cow flow

Wisconsin reports that higher cow-to-robot stocking densities were consistently linked to lower milking frequency. It also reports that roughly every 13 percentage-point increase in freestall stocking density made cows 1.6 times more likely to need fetching. If the robot is running at full capacity and the fetch list is long, the recommendation is to reduce the cow-to-robot ratio or adjust your milking-frequency expectations.

Then watch behavior at the robot entrance. Wisconsin notes that competition near the robot is more pronounced in free-flow barns, and suggests watching for blocking and considering a separate group for first-lactation or timid cows. Spend an hour at the busiest time and note who waits, who gets pushed off and who never comes. Our guide to cow comfort in freestall barns applies here as well, since cows that cannot rest properly will not visit properly.

Check 4: Fetch settings

Settings decide who gets on the fetch list. Wisconsin suggests reviewing the criteria with your dealer or adviser, and avoiding loosening them so much that the system is underused. This is also where fetching habits matter. Its best-practices article warns that fetching the same cows the same way at the same times can teach them to wait for fetching, and suggests avoiding peak traffic times, staying calm and quiet, and combining fetching with other tasks such as cleaning stalls.

Check 5: Fresh cows and first-calf heifers

Training matters most in the first days after calving. Wisconsin reports that most cows take 4 to 7 days to adapt to the system, that first-lactation cows adapt more slowly than experienced cows, and that more milkings early in lactation were associated with higher milk production and persistency. It suggests fetching fresh cows several times a day for the first few days after calving. It also reports that heifers exposed to the robot, its mechanics and concentrate before calving showed better let-down, easier entry, more visits and higher yield, so pre-calving training is worth considering.

Check 6: Maintenance and the machine itself

If health, feed, flow and settings all look reasonable, ask whether the machine is performing. Wisconsin publishes a set of AMS maintenance tips. Check cleaning cycles, liners, teat detection and alerts, and ask your dealer to review the logs for failed attachments and kick-offs.

A quick order of operations

1. Pull the fetch list and note the repeat names.
2. Walk to the fetch cows and check feet, udders and condition.
3. Review the PMR and pellet balance with your nutritionist.
4. Count cows per robot and watch the entrance at peak time.
5. Review fetch criteria and fetching routines with your dealer.
6. Check how fresh cows and heifers are being trained.
7. Have the machine serviced and its logs reviewed.

Record what you change and when, and change one thing at a time. Broader resources are at agriculture.directory, and for a lighter look at farm technology see this farm.fm story. This site is independent and not affiliated with any breed association.