What if the biggest gains in calf health happen after the first feed? We explore the overlooked power of transition milk — the nutrient- and antibody-rich milkings from days two to four — and how feeding it for 10 days can tilt the odds toward healthier, faster-growing calves. With veterinary surgeon Dr Ryan Davies, we follow a spring block-calving herd in West Wales from a farmer’s observation to a structured study, complete with daily passive immunity testing and twice-daily Brix checks on pooled, pasteurised fresh cow milk.

We start with the fundamentals: dialling in colostrum quality, quantity, timing, cleanliness, and stress to hit excellent passive transfer. Then we move beyond day one. Ryan breaks down how calving density drives pool quality, why Brix can fluctuate from bulk-tank levels to true transition milk, and the practical choice every farm faces — maintain quality for the youngest calves or dilute to stretch days. The data make the case: calves receiving higher-quality transition milk grew faster to weaning, and those with low serum IgG at 24–48 hours saw a reduced mortality risk when the quality was strong. It’s a clear demonstration of local gut protection from antibodies and the extra lift from proteins, fats, growth factors, lactoferrin, and prebiotics.

We also address the risks and realities: pooling can spread pathogens, pasteurisation has limits for Johne’s and TB, and over-heating destroys the very bioactives we need. The solution is disciplined herd health plans, careful cow selection for the pool, and routine measurement. Expect straight talk on Brix targets, when to prioritise younger calves, and why prevention beats treatment when disease pressure climbs later in the block. The early signals are promising for beef finishing times and future heifer performance, with full productivity and longevity data to come.

If you’re aiming to reduce antibiotics, protect staff morale, and improve sustainability without adding complexity, this is a practical blueprint: test, pool, pasteurise, protect quality, and feed transition milk for 10 days. Subscribe, share with a fellow calf rearer, and leave a review to help more producers find these insights.

This was recorded in January 2026, and all information was correct at the time of recording.

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