Most of what we know about feeding young dairy-bred calves comes from replacement heifers. That knowledge gives us an excellent biological foundation, but beef-on-dairy is beginning to ask different questions.
The economics are different. A replacement heifer carries considerable future value to the dairy, whereas a bull or steer must recover its rearing costs through beef production. That does not mean feeding the beef calf cheaply. It means asking whether each nutritional investment produces a return later in the beef system.
And increasingly, I think we need to ask whether we are preparing the calf for the right system at all.
Starter Has a Bigger Job
Starter intake is important because milk-fed growth alone does not fully prepare the rumen for life without milk. Fermentation of starter develops the rumen’s absorptive capacity and allows the calf to progressively obtain more nutrients from dry feed.
So, when it comes to beef-on-dairy calves, I do not judge an early feeding program only by body weight at weaning.
I also want a healthy calf consuming meaningful amounts of dry feed and capable of continuing to grow when the milk disappears. But even that may be too narrow a definition of success.
Ready to Wean — Onto What?
A calf moving from milk and starter into a concentrate-based growing system faces one nutritional transition. A calf entering a silage-based backgrounding program faces another. And a calf going into a stocker program may soon be expected to obtain most of its nutrients from forage.
Yet, we generally ask whether the calf is ready to leave milk, not whether it is ready for the diet that follows. That distinction may become increasingly important as beef-on-dairy production develops into several different production pathways.
In my opinion, starter formulation, milk-feeding strategy and even the timing of weaning should eventually be considered in relation to the calf’s next destination rather than treated as one universal program.
Hay Is a Good Example
The debate over forage before weaning for dairy heifers illustrates the problem. Too much hay can reduce starter intake, so limiting forage can make sense when the objective is to maximize consumption of a nutrient-dense starter. But what if that calf will shortly enter a forage-based beef system?
We do not yet know whether modest forage exposure before weaning improves subsequent adaptation to pasture or other forage-heavy diets. And that lack of information is precisely why I would hesitate to turn recommendations developed primarily for dairy replacements into universal rules for beef-on-dairy calves.
I would still protect starter intake. But I would also start asking whether some calves should become familiar with forage before forage becomes their job.
Beef-on-Dairy Calves Deserve Their Own Answers
The dairy industry has given us the starting point, but it cannot automatically provide the final prescription. Beef-on-dairy calves have different economic value, different production destinations and potentially different measures of success.
We already know a great deal about getting a dairy calf successfully through weaning. The next challenge is learning how to rear a beef-on-dairy calf for the system that follows.
— Ioannis Mavromichalis is a U.S.-trained animal nutritionist whose international consulting work focuses on translating complex nutrition science into clear, practical decisions for commercial beef production.
