Successful cattle producers know that every IVF-born calf represents a significant investment of time, resources, and genetic potential. When implementing an IVF program, managing for the best outcomes is critical – and that starts with choosing the right partner.
With Vytelle, producers can count on a hormone-free IVF system backed by years of research, globally standardised lab protocols, and proven on-farm results. While the issue of larger calves is a commonly raised concern in IVF programs, it’s just one of several misconceptions. With informed management, careful planning, and a reliable technology partner like Vytelle, producers can achieve predictable, healthy outcomes and drive meaningful genetic progress.
Understanding Large Calves in IVF Programs
Large calves can occur in any breeding program – whether natural service, AI, or IVF. The perception that IVF produces more large calves often stems from the fact that IVF programs typically result in multiple offspring from the same mating appearing in a herd simultaneously. This concentration can create the impression of a pattern, when in fact, the same variables affect calf size regardless of conception method.
So, what actually influences calf size? Four key factors come into play: genetics, gestation length, recipient nutrition, and the protocols of your IVF partner.
Here’s how to set your IVF program up for success:
Recipient selection
Select mature cows with no history of calving issues and at least 45 days post-partum. Recipients with good pelvic capacity are ideal, and cows over three years old are generally preferred for their calving maturity and stability. In addition, recipients should have all vaccinations and treatments against reproductive diseases completed prior to a transfer program.
Mating management
Genetics matter – a lot. Birth weight EPDs for both the sire and donor account for up to 50% of calf size, whilst parent genetics is the reason for a large calf in 90% of cases. When pairing high-genetic-merit animals, ensure you are considering traits that support easy calving, not just performance.
Precise record keeping
Record everything: heat cycles, implant dates, pregnancy checks, and calving windows. Monitoring due dates, of your IVF pregnancies, is critical, especially because a calf can gain up to 2 lbs (0.9 kg) per day beyond its expected due date. Consult your vet about a calving plan, particularly for overdue pregnancies.
Nutrition planning
A tailored nutrition program based on the stage of gestation supports consistent development and birth weights. Work with your nutritionist to refine rations and adjust throughout the pregnancy cycle.
Choose the right IVF partner
Not all IVF labs are made equal. Vytelle delivers a proven and stable media suite that mimics the uterine environment and is backed by years of global research and on-farm results. The consistency of Vytelle’s protocols – which are never adjusted in reactionary ways – ensures reliable embryo quality, supporting healthier calves from the outset.
IVF-born calves represent a significant investment, and as such, deserve attentive, high-quality care. By carefully managing every step – from donor selection, recipient selection to calving – producers can significantly increase their chances of success and consistently achieve healthy, high-performing calves.
