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A feeding system that prevents dairy cows sorting concentrates from forage in a Total Mixed Ration (TMR) has been shown to increase average daily milk yield by 1.6 litres/cow during a Farming Connect trial

Compact TMR, which involves soaking concentrates in a TMR in water and pre-mixing, was trialed in the dairy herd at Llysfasi College, a Farming Connect Innovation Site.

The unit manages its herd of all-the-year-round calving Holstein Friesians in two groups of 100 cows in line with its a2 milk contract; this allowed the two systems of feeding to be directly compared.

One group was fed a ration mixed conventionally in a feeder wagon whilst the ration fed to the second group was prepared according to the compact method; this involved moistening and pre-mixing the dry components in 8 litres of water per cow ration then mixing these with the forages for 30 minutes.

The principle behind this approach is that it gives every cow a consistent ration.

During the four-week trial, milk output in the compact TMR-fed herd not only increased but dung, milk butterfat and rumination levels among all the cows were more even.

Will Jones, of Kite Consulting, who analysed the trials results on behalf of Farming Connect, says the data demonstrated that the diet was consistent.

“Every cow is getting a diet that is closer to that shown on paper instead of some getting more concentrates because they have sorted it from the forage and the more timid cows getting the fibrous material that has been left behind.

“In this trial there was more of a range of rumination because some were dealing with too much fibre while others were dealing with acidosis because they had eaten too much concentrates.’’

Soaking the feed overnight makes it more available in the rumen; this is because the protein bonds in the different feed components are broken down and the degradation of the feedstuffs is quicker because it can be accessed by rumen bugs.

A dung texture scoring system, ranging from loose and watery at 1 to a stiff consistency at 5, was also used to assess cow diet. “There was a high level of 2s in the normal TMR group which is indicative of a ration imbalance,’’ Mr Jones explains.

Llysfasi has good mixing protocols for the normal TMR ration and feeds a comparatively low level of concentrates – the ration is 4.5kg concentrates and 70% forage DM - therefore there is opportunity for even greater improvements in herds where rations are under-mixed or have a higher level of concentrates, Mr Jones adds.

“I was not expecting to see such a big improvement, there will be potentially even bigger gains on other farms,’’ he admits.

Llysfasi farm manager Dewi Jones says he has been convinced by compact TMR and will continue this approach next winter.

“At 29p a litre on a 200-cow herd based on a 180-day winter, the extra 1.6 litres of milk produced per cow per day would generate an additional £17,000 or so of milk income,’’ Mr Jones calculates.

“We have not fed the herd more, we have just fed them differently.’’

He says the benefits extend beyond milk yield. “We have built a facility that is high cow welfare but having variation in the diet meant that the timid cows were not getting a fair share of the ration.’’

He is confident that over a longer period of time there will be increased lying times and improved foot health because cows will be less inclined to follow the mixer wagon around the shed once they learn they can’t sort the feed.

Rhys Davies, Dairy Technical Officer at Farming Connect, says the system does require additional work but that this should be balanced against financial return.

“For high yielding herds in particular, this system is definitely worth considering,’’ he says.


Considerations of compact TMR 

The system requires high dry matter silage therefore forages need to be carefully planned; it is not an option to add less water when forages are wetter as this will result in the balling of concentrates.

The system is difficult to implement if forage has a low dry matter.

Feed can stick to the augers of vertical feeders so be vigilant for this when mixing or feeding out.

There must be adequate NDF in the diet for compact feeding to work.

Diets must not have too high a level of fermentable starch prior to adding water because fermentation will increase and lead to potential issues with acidosis.

Don’t add rumen protected fats to the pre-mix because they will degrade - add these at the same time as the forages.


Potential pitfalls

During warm weather the pre-mix can heat up and requires the addition of acid to stabilise.

Keep a close eye on potential balling of concentrates which can be caused by faulty blades on a mixer wagon or insufficient mixing time.

The mix will be more dense than standard TMR and this can wear parts such as the shear pins on PTO shafts.


Rumination levels in the two groups based on 11 cows in each group

Rumination minutes – 1 day





Compact TMR





Standard TMR