Optimising Reproduction in New Zealand Dairy Herds:

Reproductive efficiency is one of the most critical drivers of profitability in a dairy operation. As a veterinarian specializing in reproductive technologies across multiple livestock species, I’ve seen firsthand how a well-managed breeding program directly impacts milk yield, calving intervals, animal health, and long-term herd genetics.

1. Start with a Sound Reproductive Plan

A successful program begins with clearly defined goals. Are you focused on tightening calving intervals, improving replacement heifer quality, or integrating elite genetics? Every decision — from synchronization protocols to semen selection — should align with your operation’s objectives.

2. Fertility Depends on Cow Condition

Body condition score (BCS), nutrition, mineral balance, and post-calving recovery all influence fertility. Cows that are too thin or too fat at mating struggle to conceive. Work with your nutritionist and vet team to assess energy balance, especially during transition periods.

3. Maximise AI with Heat Detection or Synchronisation

New Zealand’s seasonal calving systems demand precise timing. Missed heats cost you days open. Consider heat detection aids, tail paint, or fixed-time AI programs. These tools can help streamline your workload and improve conception rates, particularly in large herds.

4. Know When to Use Repro Technologies

Embryo transfer and in vitro fertilisation (IVF) are no longer limited to elite studs. Commercial dairy operations now use these technologies to multiply top cows, reduce disease risks, and rapidly advance genetics. When used strategically, they offer significant return on investment.

5. Don’t Overlook Bull Management

Natural service sires are still common on many NZ farms. Annual breeding soundness exams, disease screening, and appropriate mating ratios are essential to ensure bulls are contributing positively to the reproductive program — not masking fertility issues.

6. Data Drives Success

Track submission rates, conception rates, and pregnancy loss over time. These metrics, combined with vet input, help identify bottlenecks early and guide improvements year-over-year.

Final Thoughts

Veterinary support shouldn’t be reactive. A good repro vet is your planning partner — helping you design, implement, and evaluate a system that fits your herd, land, and goals. At RSG New Zealand, we’re here to bring global expertise and practical solutions to help your herd succeed.

For questions or to book a consult, reach out to our team — we’re here to support your success, one breeding season at a time.

Career Opportunites

We are growing to better serve our clients!

RSG New Zealand is growing, and we’re looking for passionate people to grow with us.

Backed by the global strength of Reproduction Specialty Group (RSG) in the U.S., our team is building a new standard for reproductive services across the country — supporting dairy, beef, sheep, goat, and swine producers with world-class care and technology.

Whether you have experience in management, animal handling, veterinary services, lab work, or client support, there’s a place for you at RSG. We’re creating a workplace that values innovation, teamwork, and a shared commitment to livestock health and productivity.

Current openings are posted on our Careers page — and we’re always on the lookout for people who bring energy, reliability, and a desire to make a difference in the industry.

If you or someone you know is ready to be part of a fast-moving, forward-thinking team, we’d love to hear from you. Visit our website to learn more and apply today.

RSG Social Links

Join us on social media at:

• facebook
• instagram
• Linkedin