Boost Your Profitability by Preventing Calfhood Disease!
Guest Speaker: Dr. Geof Smith (Technical Services Veterinarian, Zoetis)
I recently caught an insightful webinar from Hoard’s Dairyman. I’d like to share some key takeaways with you. (If you want to watch the full session, check out the link below!)
(Side note: It wasn’t Abby Bauer hosting today! It was someone new—I have to admit, I missed Abby’s presence! But let’s get down to business.)
Introduction: Calves are an Investment
Back in the 90s, many dairy farmers viewed calves as a “cost” or an “expense” to be kept as low as possible. Today, most progressive farms recognize that calves are an investment. We now know that how a calf is managed during the first 6–8 weeks of life dictates its future productivity.
The goal is simple: produce high-quality, healthy calves that grow steadily. Yet, scours (diarrhea) and respiratory disease remain the top challenges. Respiratory disease is directly linked to future performance, and scours is a significant risk factor for developing respiratory issues later on.
The Long-Term Cost of Pneumonia
Many people think, “A little pneumonia isn’t a big deal—we’ll just treat it, and they’ll recover.” But the data suggests that pneumonia acts as a silent anchor on your herd’s performance.
Survival Rates: Research shows that calves experiencing pneumonia within the first 60 days of life have a lower survival rate to first lactation (66%) compared to their healthy counterparts (84%).
Source: The effect of respiratory disease and a preventative antibiotic treatment on growth, survival, age at first calving, and milk production of dairy heifers.
Milk Production Impact: A study of over 14,000 calves in Utah found that animals treated for Bovine Respiratory Disease (BRD) produced 232kg less milk in their first 305-day lactation. Furthermore, 35% of those treated for BRD were culled before their first calving, compared to only 17% of non-BRD calves.
Source: Journal of the American Veterinary Medical Association, 2016, Vol. 248, 1157-1164, The association between calfhood bovine respiratory disease complex and subsequent departure from the herd, milk production, and reproduction in dairy cattle.
Reproductive Performance: Cornell University research found that calves with lung consolidation (detected via thoracic ultrasound) had a 10% lower conception rate and a higher risk of being culled before first lactation.
Source: Journal of Dairy Science, Thoracic ultrasound assessment of lung consolidation at weaning in Holstein dairy heifers: Reproductive performance and survival.
Consistent Losses: Research from the University of Guelph showed that calves with lung consolidation produced 525kg less milk in their first lactation.
Source: The effect of lung consolidation, as determined by ultrasonography, on first-lactation milk production in Holstein dairy calves.
The bottom line from a meta-analysis: If a calf is diagnosed with pneumonia, the odds are stacked against it:
Mortality risk increases 2.85 times.
Risk of being culled before first calving increases 2.3 times.
Average Daily Gain (ADG) drops by 0.067kg.
First-lactation 305-day milk production drops by 122kg.
Source: ScienceDirect, Effects of calfhood respiratory disease on health and performance of dairy cattle: A systematic review and meta-analysis.
Economic Impact: The estimated cost of a single BRD case in the first 120 days is roughly $282 in medical and immediate costs. When you factor in the reduced lifetime productivity, that loss climbs to approximately $400 per animal.
What Can We Do? Best Practices for Day 1
The most critical factors are maternity pen hygiene and colostrum management.
1. Hygiene Monitoring We can now use ATP swabs to check the sanitation levels of milking equipment, tubes, and bottles in real-time.
ATP (Adenosine Triphosphate) is present in all microbial cells. By swabbing a surface and measuring the light emitted in an ATP meter (measured in Relative Light Units, or RLU), we can quantify organic contamination.
Targets: While medical fields often aim for <30 RLU, many farms find <100 RLU to be a practical and achievable goal for feeding equipment. The key to lowering these numbers? Physical scrubbing! It removes the biofilm that chemical disinfectants alone cannot reach.
2. Colostrum Management
Harvest Early: IgG concentration in colostrum drops quickly after calving. Harvest as soon as possible—ideally within 2 hours.
Feed Early: Feed 4L within the first 2 hours. Every hour delayed reduces IgG absorption efficiency by about 4%.
Verify: Check total protein (TP) in blood samples from 10 calves per month (aged 2–8 days) and aim for ≥6.2 g/dL.
Extend the Window: Supplementing with high-quality colostrum powder (providing 20–30g of IgG per day) for the first 1–2 weeks is a highly effective way to support the calf’s immune system.
Final Thoughts
Pneumonia is not just a “treatable” illness—it is a major barrier to your herd’s genetic and economic potential. I’m personally convinced that an ATP meter is a must-have tool for any farm serious about calf health.
It’s late, and I’m exhausted, so I’m calling it a night! There is still half of this lecture to go, but for now, I hope these takeaways help you make a difference in your barn tomorrow.
引用元：The effect of respiratory disease and a preventative antibiotic treatment on growth, survival, age at first calving, and milk production of dairy heifers.
-引用元：JAVMA .2016. 248.,1157-1164,The association between calfhood bovine respiratory disease complex and subsequent departure from the herd, milk production, and reproduction in dairy cattle
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