A dairy cow's feed requirement per day is set by her body weight before anything else. The planning figure used in Ugandan herd assessments is 6.25 kg of dry matter per 250 kg of live weight, which works out at about 2.5 percent of her weight just to hold her steady. Milk, pregnancy and growth all sit on top of that. Water and minerals are separate daily requirements again.
Start From the Cow's Weight, Not From the Feed Bag
Ask how much to feed a dairy cow and almost every answer comes back as a number of kilogrammes. That number is useless without the weight of the animal it belongs to. A 300 kg local cow and a 500 kg Friesian cross do not eat the same amount, cannot eat the same amount, and should not be fed the same amount.
Weight is also the one figure nobody has. Very few Ugandan farms own a cattle scale. The practical substitute is a heart girth tape, a strip marked with weights that you read off the measurement around her chest just behind the front legs. A Ugandan feeding trial at a commercial farm used exactly that method to track the weight of its cows, so it is good enough for research and it is certainly good enough for a ration.
Buy or borrow one, measure every animal, and write the numbers down. Everything below is arithmetic on that one figure, and without it you are guessing.
How Much Feed Dry Matter a Dairy Cow Needs Per Day
Feed is mostly water, so requirements are stated as dry matter: what would be left if you dried the feed completely. That is why a bucket of fresh grass and a bucket of hay are not the same feed.
Ugandan herd assessments use a standard planning figure of 6.25 kg of dry matter per tropical livestock unit per day, where one unit is 250 kg of live weight. That is 2.5 percent of body weight. The Makerere survey of Kiruhura district applied it to an average herd of 73.26 units and arrived at an annual requirement of 167 tonnes, which is what 73.26 multiplied by 6.25 and by 365 days gives, so the figure and its use reconcile exactly.
Two things have to be said about that 2.5 percent, and skipping them is where most feeding advice goes wrong. First, it is a maintenance figure. It is what she needs to stay alive at the same weight, and the study that used it says so. Second, a milking cow needs nutrients for maintenance, for growth if she is under about thirty months old, for the calf if she is pregnant, and for the milk itself. So 2.5 percent of body weight is the floor rather than the target.
| Body weight, kg | Dry matter floor, kg a day | Water at 8 litres of milk, litres |
|---|---|---|
| 250 | 6.3 | 37 |
| 300 | 7.5 | 42 |
| 350 | 8.8 | 47 |
| 420 | 10.5 | 54 |
| 500 | 12.5 | 62 |
The water column comes from the rule in the next section but one. Both columns are arithmetic on the weight in the first column, which is the point: one measurement gives you two daily requirements.
Turning a Dry Matter Figure Into Buckets of Wet Feed
Nobody feeds dry matter. You feed grass, hay, silage and meal, all of which carry water, so the kilogramme figure on the plan is always smaller than the kilogramme figure in the wheelbarrow. A Ugandan laboratory analysis of three feeds used in a Makerere feeding trial gives the conversion for the commonest cases.
| Feed | Dry matter, percent | Fresh kg per 1 kg dry matter |
|---|---|---|
| Rhodes grass hay | 83 | about 1.2 |
| Sweet potato vine silage | 27 | about 3.8 |
| Compound dairy pellets | 68 | about 1.5 |
If the only figure you can measure is fresh weight, measure fresh weight and be consistent about it. A farm that knows it puts 80 kg of chopped Napier in front of a cow every day has a usable number. A farm that says "plenty" does not.
What a Ugandan Crossbred Cow Actually Ate Per Day
Requirements are theory. There is one Ugandan trial that measured what a crossbred dairy cow actually ate and what happened to her body while she ate it, and it is worth working through in detail because the arithmetic lines up with everything above.
The trial, run jointly by a Ugandan university, an international root crop research centre and the national livestock research institute, put four Ankole and Friesian crossbred cows in early lactation on a basal ration of Rhodes grass hay offered without limit plus four kilogrammes of compound dairy pellets, then added sweet potato vine silage at four rising levels. The cows averaged about 423 kg live weight and about 9.2 litres of milk a day at the start. Intake was measured by weighing what was offered and subtracting what was refused.
| Silage level in ration | Dry matter eaten, kg a day | Daily weight change, kg |
|---|---|---|
| None | 6.8 | minus 0.20 |
| Low | 8.5 | minus 0.25 |
| Medium | 10.2 | minus 0.22 |
| Highest | 11.9 | plus 0.35 |
The transferable lesson is blunt. A cow offered as much hay as she likes plus four kilogrammes of meal was still underfed, and the shortfall showed in her body weight rather than in any obvious symptom. If the ration on your farm looks generous and the cow is thinning, the ration is not generous.
Daily Feed Requirements by Milk Yield
Milk sits on top of the maintenance floor, and the honest position on how much feed a litre costs is that I could not find a verified Ugandan figure in kilogrammes of dry matter per litre. So here is the calculation inverted, using two rules that are verified, both from the regional smallholder dairy manual.
Rule one: good quality forage alone carries about five litres a day, and up to ten where the forage is very good. So the first five litres need no purchased feed at all, only forage that is actually good, which for Napier means cut under one metre and dark green rather than over two metres and stemmy.
Rule two: above five litres, feed half a kilogramme to one kilogramme of concentrate per extra litre after the first twelve weeks of lactation, and expect each kilogramme of concentrate to return one to one and a half litres. That second half is the test. A cow eating a kilogramme of meal and giving back less than a litre is either short of forage or past the point where meal pays.
Applied to a cow giving eight litres a day past week twelve, that is three litres above the forage baseline, so one and a half to three kilogrammes of concentrate a day, laid over whatever quantity of good forage she is prepared to clear. At twelve litres it is three and a half to seven kilogrammes. Notice how fast the concentrate requirement climbs relative to the milk, which is why high yields on bought feed stop paying long before the cow stops responding.
Early lactation breaks rule two on purpose. In the first twelve weeks her appetite is down while her requirement is at its peak, and she cannot physically eat enough bulk to cover the gap. What she yields in that window also fixes the ceiling for every month afterwards. Feed heavily then, thinly later. The timing argument is worked through in the dairy cow feeding guide.
Why Most of the Daily Feed Dry Matter Has to Be Forage
There is a structural constraint on the daily ration that has nothing to do with cost. At least 70 to 80 percent of the dry matter she eats each day has to come from bulk forage, for the rumen to keep working, for her to chew the cud, and for the milk to carry normal butterfat.
Put that against the floor. A 420 kg cow needing 10.5 kg of dry matter a day must get 7.4 to 8.4 kg of it from forage. In hay that is roughly 9 to 10 kg of hay. In fresh cut grass it is a great deal more, which is the daily cutting job nobody costs before they build the shed.
The constraint cuts the other way too. Concentrate reaching 60 to 70 percent of the ration's dry matter, or going past about 14 kg a day, causes health problems, because fast fermenting feed turns the rumen acid and the acid then stops the forage being digested. Few Ugandan smallholders will ever come near 14 kg. Many feed the whole day's meal in one bucket at milking, which produces the same effect at small scale, and the fix costs nothing: mix it through the chopped forage instead.
Daily Concentrate Feeding Rates and the Ceiling
Ugandan farm records put real numbers on how much concentrate a dairy cow actually gets here. In a study that built detailed budgets for seven typical Ugandan dairy farms, concentrate use ran at about 1.22 tonnes per cow per year on a single cow zero grazing unit, 0.83 tonnes on a fifteen cow paddock farm, 0.50 tonnes on a large intensive farm, and nothing at all on the four extensive farms keeping local cattle.
Spread the top figure over a 300 day lactation and it is roughly four kilogrammes a day, which is the same order as the four kilogrammes of pellets used in the Makerere trial. So four kilogrammes a day is about the ceiling of what a well run Ugandan smallholder dairy farm actually feeds, and the majority feed none.
That is worth knowing before you plan around a figure from elsewhere. A ration sheet calling for eight or ten kilogrammes of compound feed a day describes a farm that does not exist in most Ugandan districts. Work up from four rather than down from ten, and make the forage carry the first five litres.
Daily Water Requirements Alongside the Feed
Water is a daily requirement and it is the one that limits intake fastest. Milk is up to 85 percent water, and it takes about five litres of water to make a litre of milk. A cow deprived of water dies within a day or two, long before one deprived of feed.
The working rule from the regional manual is one litre for every ten kilogrammes of body weight, plus one and a half litres for every litre of milk. Its own worked example: a 325 kg cow giving ten litres needs at least 32.5 plus 15, so 45.5 litres a day. Run the same arithmetic on a 420 kg cow giving eight litres and you get 42 plus 12, so about 54 litres a day. That is more than most farms carry to a shed.
Ideally she drinks whenever she wants. She will not get 54 litres into herself at a single visit, so a farm that carries water to the shed once a day has capped her intake before the feed plan is even written, and capped intake caps milk. Water scarcity in the dry season is named among the top three constraints in Ugandan district assessments, which makes this a seasonal problem rather than a constant one. Crossbred cows handle heat poorly, which raises what they need again. If storage is the blocker, look at housing and water provision before buying more feed.
Daily Mineral Requirements and What Ugandan Farms Actually Use
This is the one daily requirement that cannot usefully be written as a weight. The amounts are small, they differ by mineral, and what any given forage already supplies depends on the soil it grew in. Which minerals go short on Ugandan land, and why the dry season makes it worse, is set out in the feeding guide.
What can be put on a daily basis is usage. Ugandan farm records across seven farm types show mineral consumption of roughly 10 kg up to about 83 kg per cow per year, the top figure from a semi nomadic herd where salt was the only purchase made. Divide those by 365 and you get roughly 27 to 230 grammes a cow a day. That band is wide, it is derived rather than measured daily, and it describes what farms use rather than what a cow requires, so do not feed to it.
The practical daily requirement is simpler than a weight: constant access to a mineral lick or a loose mix, in a place she can reach without competition, topped up before it runs out. The Ugandan feeding trial gave its cows free access to a commercial mineral block alongside clean water throughout. See mineral supplements for livestock for what the labels declare.
Daily Feed Requirements for Dry Cows, Heifers and Calves
The maintenance floor applies to every animal in the herd, which is why a herd budget is not a milking cow budget multiplied. Roughly three in ten animals in a Ugandan grazing dairy herd are in milk; the other seven eat at the floor or above it.
A dry cow still needs her maintenance dry matter plus what the calf inside her takes plus the repair of her udder tissue, and quality forage on its own will usually cover the lot. Dry stalks will not. The failure to watch for at this stage is the opposite of underfeeding: a cow carrying too much condition into calving runs into more trouble at it.
A heifer needs maintenance plus growth, and Ugandan measurements suggest most do not get it: age at first calving runs from about 26 months on well fed crossbreds to about 36 or 37 months on poorly fed ones. Ten extra months of feeding an animal that produces nothing is one of the largest hidden costs in a Ugandan dairy herd.
A calf starts on milk because her rumen cannot digest fibre yet, and the rule of thumb in the regional manual is 15 percent of birth weight in milk a day. Good forage and a little concentrate from the second week are what build the rumen so she can move onto fibre. Detail belongs in the calf feeding guide and dairy calf management.
At herd scale the arithmetic scales too. The Kiruhura study's planning factors were about 2 tonnes of dry matter a hectare a year from natural pasture and about 8 tonnes a hectare from planted pasture, and on that basis an average herd needing 167 tonnes a year was getting 139 tonnes, about 83 percent of requirement. Multiplying your own herd's units by 6.25 kg and by 365 days, then dividing by what your land yields, tells you whether your farm can feed your animals at all. If it cannot, the answer is fewer animals or more planted fodder, and buying feed in the dry season is the expensive third option.
Checking Whether the Daily Ration Is Feeding Her Enough
A ration is a hypothesis. These are the tests, and they cost nothing.
Run all six for a month and you will know more about your cow's requirement than any table can tell you, because you will know it for her weight, her yield and your forage. The rest of the picture sits in dairy farming in Uganda and the section overview at cattle and dairy, and the levers beyond feed are in how to increase milk production. For a comparison with other stock, see dairy feed requirements and goat feed requirements.
Dairy Cow Feed Requirements Per Day: Common Questions
How many kilogrammes of feed does a dairy cow need per day? Between about 6 and 13 kg of dry matter for maintenance alone, depending on her weight, at 2.5 percent of body weight. In wet feed that is a good deal more: roughly 1.2 kg of hay, 1.5 kg of pellets or nearly 4 kg of a wet silage for every kilogramme of dry matter. A milking cow needs above the maintenance floor, and a Ugandan trial measured crossbred cows losing weight at 6.8 kg of dry matter a day and gaining at 11.9 kg.
How do I know my cow's weight without a scale? Use a heart girth tape, measuring around her chest just behind the front legs and reading the weight off the tape. A Ugandan feeding trial tracked its cows this way. Measure every animal in the herd once, write it down, and repeat monthly for the milking cows so you can see weight loss before it becomes obvious.
How much Napier grass does a dairy cow need per day? Enough to supply 70 to 80 percent of her dry matter, which on fresh cut grass means a large volume. The usable figures come from intake rather than from a plan: a large breed such as a Friesian can eat more than 100 kg of fresh forage a day and a lighter breed such as a Jersey 65 to 85 kg. Cut it under one metre tall and chop it, because Napier over two metres drops to the poor quality band and fills her without feeding her.
How much dairy meal should I give per day? None for the first five litres, which good forage should carry. Above that, roughly half a kilogramme to one kilogramme per extra litre after the first twelve weeks of lactation, so about one and a half to three kilogrammes a day for a cow giving eight litres. Ugandan farm records suggest about four kilogrammes a day is the practical ceiling that real well run farms reach, and most Ugandan dairy farms feed none at all.
How much water does a dairy cow need per day? One litre per ten kilogrammes of body weight plus one and a half litres per litre of milk, which is about 45 litres for a 325 kg cow giving ten litres and about 54 litres for a 420 kg cow giving eight. Water should be available all the time rather than once a day, because a cow who cannot drink cannot eat her requirement.
What does feeding a dairy cow cost per day in Uganda? It depends almost entirely on whether the forage is grown, grazed or bought, and the spread is enormous. Among 100 dairy enterprises in five south western districts where cattle graze natural pasture, feed was only about 11 percent of the cost of producing a litre, while on a zero grazing farm buying a ration feed can reach around 60 percent. Those are not contradictory figures; they describe opposite systems. For the shilling lines, including the sourced cost of farm made silage and hay against bought bales, see cost of dairy farming and work your own numbers with dairy farming profit calculation.
How much salt or mineral does a cow need per day? Small amounts, continuously, rather than a measured dose. Ugandan farm records show mineral use of roughly 10 to 83 kg per cow a year, which works out at roughly 27 to 230 grammes a day, and that is a derived range describing what farms use rather than a requirement. The practical answer is constant access to a lick or loose mix she can reach, topped up before it empties.
Does a dry cow need less feed per day? She needs less than she did while milking, and more than nothing. Her maintenance floor is unchanged at about 2.5 percent of body weight, and the calf inside her and her udder repair sit on top of that. Good forage alone usually covers it. Dry maize stalks do not.
Two numbers will tell you more than this whole page: your cow's weight off a girth tape, and her litres written down daily for a month. Then get local prices for what a bag of compound feed and a bag of bran cost at your nearest mill, and what a bale of hay costs at your nearest store, so you can see whether her extra litres are paying for the feed that made them. Your district production office and a local extension officer can confirm what pasture and legume species do well on your soil, and where clean planting material is available.