BCS Targets: Why Body Condition Score Matters at Calving
Body Condition Score (BCS) is a critical element in managing the health and reproduction of the dairy herd.
In the weeks before calving, she's simultaneously growing a calf - around 75% of its birth weight is gained in the final 90 days alone - producing colostrum antibodies, adjusting her calcium metabolism, and trying to hold condition through a significant diet change.
The energy demand outstrips what she can eat. That gap - negative energy balance - is where next season’s problems are seeded. The trouble is, on a NZ pasture-based farm, you’re unlikely to see it going wrong until it already has.
Research shows 85-95% of health events in the first 30 days in milk originate in the transition period, well before a cow shows anything visible. CowManager’s NZ data puts a number on what that costs: cows with repeated transition alerts - those accumulating three or more alert days across the transition window - produce 5-8% less milk than herd mates who transition cleanly. Not just at peak. Across the full 300 days in milk. And the effect is strongest in cows on their third lactation or beyond, exactly the animals carrying the most production weight in your herd.
That’s not a bad week. It’s a bad season.
Two Signals, Not One
Most monitoring systems track behaviour. CowManager tracks behaviour and ear temperature simultaneously, from a single ear-mounted sensor. The distinction matters. Ear temperature reflects changes in blood flow and correlates with physiological stress before it alters how a cow moves or eats. That earlier signal is the difference between an alert on day one and a problem you find on day five.
Neither ‘At Risk’ nor ‘Suspicious’ is a diagnosis. They’re prompts to take a closer look. Your vet still makes the call. Assign them visibility inside your portal and they have full access to your herd’s data. They’re working from a stronger starting point as the story is unfolding - not at the conclusion.
Your Financial Window Opens At Dry-Off
CowManager monitors each cow from dry-off through to 25 days after calving - the full transition window, continuously, across the whole herd. Your team starts each day knowing which animals need attention, rather than which paddock to walk and hoping to spot it.
Every dry-off you go into without that visibility is a season of data you won’t get back. And on most herds, the return on closing that gap is more than most farmers expect.
Book a call with your local Cow- Manager rep and run the numbers through our ROI calculator - see what your transition is costing you.
cowmanager.co.nz
0800 770 566
Article supplied by CowManager
