Calf Xtreme

Immune support    Rumen development    Labour saving    Boosted growth

Over 280,000 calves on Calf Xtreme since 2017

Calf Xtreme



Calf Xtreme is a powerful combination of beneficial bacteria, digestive enzymes, and live active yeast that support the immune system, increase feed breakdown, and promote rumen balance and development. This all-natural supplement is perfect for farmers looking to simplify their system and boost the health and growth of their calves. 

By purchasing Calf Xtreme, you not only get a premium product with the strongest combination and count of microbes available but we also look forward to getting in touch and working with you to bring improvements to your system to get the best out of our product for your calves. See The Calf Plan below

Farmers have found that Calf Xtreme:

  • Helps improve disease resistance and recovery in calves.
  • Allows the ability to feed calves high rates of milk, leading to early weaning, labour savings, and increased heifer milk production.
  • Helps protect the rumen from digestive upsets leading to reduced risk of nutritional scours.
  • Enhanced digestion of grass, hay, and meal, leading to increased intake of these feeds.
  • Improved rumen development and growth, resulting in an easier transition to grass and excellent post-weaning growth.

Daily dose rate

Simply mix 1 gram of the Calf Xtreme per calf per day with cold or warm milk or water using the shaker provided. Double the dosage in the first week and during times of stress for best results.


Calf Xtreme is a pure probiotic with no fillers containing:

5 strains of bacteria
5 digestive enzymes
A specialized strain of live yeast

These ingredients are carefully chosen to deliver high levels of combined probiotics to ensure maximum health benefits and growth potential for your calves.  

Click on the video links below to hear from some of our farmers themselves.


Why is Calf Xtreme a powder when other products are in a more convenient liquid form?

There are two practical reasons for this. You can’t have our live yeast in a liquid. It would simply brew and blow up the container. This yeast has a crucial role in improving digestion. 
You also can’t have live bacteria in a liquid, without storing them in a fridge. The bacteria work in the lower GI tract where they stimulate the immune system. For this to be effective the bacteria must be able to withstand stomach acids and bile. With all of our products we achieve this by providing bacteria in a micro-encapsulated form. They are not neutralized along the way and proliferate and multiply in the lower GI tract.

Other probiotics have been on the market for years and haven’t really had a major impact on the market. What makes you think yours is so different?

Consumers will not buy products if they think they are under strength or over priced. We take pride in ensuring we are delivering a high dose rate of probiotics in our products at a competitive price so we quote this dose rate on all our products. A high dose rate is critically important at overcoming some disease challenges. It is not just the high dose rate that is important but also the specific strains of Probiotics that are used. One is are sourced from Japan, one from Europe and put together in the USA. Some components are not cheap so we have selected 11 biological components which we consider give us the most effective results. These components work together synergistically. Often other products have used only a few of the components we use – say just the yeast or bacteria and very rarely the digestive enzymes.

Farmers who use Calf Xtreme claim that calves consumption of meal hay and grass is increased by using Calf Xtreme. How can this be possible when it is only added to the milk?

Milk is digested in the Abomasum of a calf but in a new born Friesian calf the abomasum only has the capacity to hold 1.2 litres. When we feed more milk than this in one feed the excess milk is stored in the Rumen. As a result of this the 5 digestive enzymes in Calf Xtreme break down meal hay and grass in the Rumen. The specific strain of yeast used also stimulates cellulose digesting bacteria. Because of improved digestion of these feed components appetite for them is increased. By two weeks of age farmers often notice hay and meal consumption is improved. This effect is more pronounced on once a day feeding systems.

Can I use Calf Xtreme to increase milk consumption without getting nutritional scours?

When high rates of milk are being fed on once a day or twice a day feeding systems the rumen is being flooded with milk. No natural digestion of milk occurs in the rumen – it has the potential to cause nutritional scours by being there. The specific strain of yeast we use stimulates lactate utilizing bacteria hence reducing the potential for nutritional scours. This is giving farmers the confidence to increase milk consumption without getting nutritional scours. This is why we maintain Calf Xtreme will revolutionise calf rearing systems. Rather than giving a broad brush recommendation as to what milk feeding rates can be successfully used we prefer to tailor a suggestion to an individual’s circumstances.

I rear healthy calves anyway so how could I get any benefit from Calf Xtreme?

We like to work with farmers to ensure they grow their calves faster, even if they don’t have disease challenges. Often higher rates of milk can be fed but even if no more milk is being fed farmers are reporting that calves are getting to weaning weights 8-10 days earlier. This is simply a result of improved digestion of feed components. As a result of earlier weaning the savings in milk will greatly exceed the cost of Calf Xtreme. However the benefits of using Calf Xtreme don’t just stop at weaning. Rumen autopsies suggest that Calf Xtreme is improving rumen development and farmers notice that calves continue to do better after weaning. By setting up the rumen before weaning there can be huge carryover benefits.

Why do you claim Calf Xtreme will give you more Heifer milk production?

Perhaps the biggest benefit from using Calf Xtreme will be in improved heifer milk production. It has been well established that if calves grow faster in the first 3-5 weeks of life they will milk better as heifers – even when they calve at the same liveweights. When you feed a young calf better they lay down better tissue in the developing udder setting them up for improved heifer milk production. We can work with you on suggestions as to how you can best achieve this.


Check out the highlights below or for the most up to date short stories, check out our Facebook or Instagram pages:




“My jersey calves were eating a significant amount of meal from an early age while still on twice daily milk which has never happened in the past. I was most impressed with their overall health and growth rates.”
– 6 week old calves before leaving shed
Caroline Charteris, Oakura Taranaki

“I have been rearing calves for  40 years and everyone has always said I rear such nice calves but these ones have been a cut above the rest. Their post weaning growth rates have been so impressive. Best I’ve reared yet. These photos were at 9 months.”
Julie Waugh, Matamata

“In spite of the high milk feeding rate (6litres, once a day) the appetite for meal was higher than I have ever had with calves before. They were eating half a kilo of meal within 2 weeks and by 3-4 weeks this had gone up to 1kgs so I then cut the milk down to 4 litres. I had previously used another couple of brands of probiotics but nothing compares with calf Xtreme and how it works. I only started on 50 calves but now I wouldn’t trust not using it.”
Jo Earwaker Otorohanga, Waikato

“Initially I only put one farm on Calf Xtreme and was extremely pleased with the result. Unfortunately we had some real issues with scours on our second farm so we got these calves on Calf Xtreme as well. I was amazed at how well they cleaned up in only two days!”
Stu McHardy, Edgecombe Bay of Plenty. (With calf 17 at 34days old and 77 days old)

34 days old

77 days old, 17 days after weaning

“I was surprised that my calves got up to a kg of meal so early as well as nearly a kg of hay – and they were still in the shed.”
Matthew Grayling. Okato, Taranaki

“This product really sells itself. It gave us problem free calf rearing apart from a small number of sick calves, which I drenched to give them the extra dose rate- and they pulled through. It really stimulated their appetite for meal and hay while in the shed and now we are having to find extra grass to put them on – they are eating much more grass than usual.”
Daphne Gordon Inglewood, Taranaki