If there's one window where management makes or breaks a cow, it's the transition period — roughly three weeks before to three weeks after calving. Get it right and she sails into a strong lactation. Get it wrong and you're treating milk fever, ketosis, retained placentas, displaced abomasums, metritis, and mastitis — usually several at once, usually in the same unlucky cows.
Why it's so high-stakes At calving a cow's world flips overnight: she stops gestating and starts milking heavily, her calcium demand spikes, her appetite dips just as her energy needs soar, and her immune system is naturally suppressed. Almost every fresh-cow disease traces back to how she navigated this handover.
The pre-calving (close-up) goals — last 3 weeks - Don't let her be over-conditioned. A cow calving over body condition 3.5 eats less afterward and crashes into ketosis and fatty liver. Aim for ~3.0–3.25. The fix happens in late lactation and the far- off dry period, not here. - Manage calcium. Sudden milk fever (and the silent subclinical version that drags down half the herd) comes from the calcium switch at calving. Strategies — a low-calcium or DCAD-balanced close-up ration, or oral calcium at calving — are worth discussing with your vet. (See "Preventing milk fever.") - Introduce the lactation ration gradually so the rumen bugs adapt before the big feed change hits. - Comfort and space. Clean, dry, uncrowded close-up housing. Stress and competition cut intake right when intake matters most.
The calving and fresh-cow goals — first 3 weeks - Maximise dry-matter intake — this is the master lever. A cow that keeps eating through calving avoids most metabolic disease. Palatable feed, plenty of fresh water, generous bunk space, and comfort all serve this one goal. - Watch every fresh cow daily: temperature, appetite, manure, milk, attitude, and any vulval discharge. Catch metritis, ketosis, and mastitis in their first day, not their third. - Smooth, clean calving. A difficult or dirty calving sets up retained placenta and metritis. Help early when needed, keep it hygienic (see "Calving difficulty: when to intervene"). - Test for subclinical trouble — ketone-test fresh cows in the first two weeks; many losing cows show nothing obvious.
The payoff Transition is the highest-return management on the farm because it prevents a *cluster* of expensive problems at their common source rather than treating each disease one at a time. A herd with a tight transition program has fewer down cows, better fertility, and higher peaks — which means more milk for the whole lactation.
Sources Cornell University PRO-DAIRY — Transition Cow Management. AHDB Dairy — Transition Management. Merck Veterinary Manual — Periparturient Diseases of Cattle.