When it comes to improving fertility, most farmers think of genetics first. But recent research makes it clear — how you feed and mineralise your cows after calving has just as big an impact on reproductive performance as the genetics you've selected for.
Farmers work hard on EBI selection, heat detection, and body condition — and rightly so. But there's a piece of the fertility puzzle that's often underestimated: the nutritional environment your cows are in during those critical weeks after calving. Get that right, and your genetics can actually express themselves. Get it wrong, and even the best EBI cow will struggle to perform.
What the research tells us
A recent study comparing cows with different genetic merit for fertility found that high EBI cows recovered faster after calving — returning to cycling sooner and achieving better conception rates. Even a difference of a few days in resumption of cycling can have a significant impact during a tight, compact breeding season.
But the study also highlighted something important: genetics set the ceiling — nutrition determines how close you get to it.
Recovery after calving is critical
Cows that recover fastest after calving — and return to heat soonest — tend to share a few things in common:
- They calved without difficulty
- They were in later lactations with established metabolic resilience
- They carried calves of optimal size, reducing calving stress
- They were well mineralised going into and through the calving period
But the single biggest driver of fertility performance identified in the research was hormonal activity — specifically progesterone.
Progesterone is the key hormone for establishing and maintaining pregnancy. Cows with better fertility genetics had higher progesterone levels — but nutrition directly influences the body's ability to produce and sustain progesterone in the first place. You can't separate the two.
How nutrition supports fertility
A well-balanced diet — with the right minerals at the right levels — supports every stage of the reproductive process:
What this means on farm
The practical takeaway from the research is straightforward: genetics sets the potential, but nutrition delivers the results.
You may have spent years selecting for high EBI cows — and that work matters. But if those cows are coming out of winter or calving into a mineral-deficient environment, they won't cycle on time, won't hold to service as reliably, and won't achieve the calving interval their genetics are capable of.
Ensuring cows receive the right minerals and nutrients after calving is essential to:
- Support uterine recovery and reduce days open
- Maintain the hormone balance needed for cycling and conception
- Improve first-service conception rate across the whole herd
- Give every cow — regardless of parity — the best chance of going in-calf quickly
The TERRA NutriTECH approach
Delivered little and often through the water system — so every cow gets a consistent, precise daily dose without relying on self-selection or handling.
Targeted at the critical post-calving and pre-breeding window — the period where mineral status has the greatest influence on reproductive outcomes.
Precision-formulated for fertility — TERRA NutriTECH Fertility Minerals provide the full trace element and vitamin profile needed to support cycling, conception, and early pregnancy.
Simple to run, with no extra labour — the AquaHerd Mineral Dosing System works automatically through your existing water supply, requiring no changes to your daily routine.
The simple takeaway
You can't change your cows' genetics overnight — but you can improve fertility today by getting nutrition and mineral balance right. The research backs it up, and the farmers using TERRA NutriTECH see it in their calving records every season.
Don't let nutrition be the thing that holds back genetics you've worked hard to build into your herd.
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