Right now, your colostrum freezer might be full but come fall and winter, yields often drop. Shorter daylight and cooler weather are big reasons.

Why it happens
After June, cows get less light and cooler temps set in. Research shows colostrum can drop from 14+ lb in summer to as low as 5 lb in winter. Older cows tend to be hit hardest.

How to prepare

• Dry period – Aim for 45–60 days to support strong colostrum production

• Reduce stress – Keep dry cows comfortable with consistent feed, water, and calm handling

• Harvest fast – Collect colostrum within 8 hours post-calving for best quality

• Oxytocin for heifers – Can help with letdown and increase first-lactation yields (vet-guided)

• Feed additives – Choline or calcidiol may help, but choose research-backed products

Managing when supply dips

• Keep a colostrum bank ready (freeze for up to a year)

• Use a Brix refractometer to sort and store high-quality batches

• Have a replacer on hand (aim for 300g IgG) when frozen supply runs low

Bottom line
Seasonal dips are normal but planning ahead — good dry period management, banking colostrum, and having replacers ready — ensures calves get the start they need year-round.

Have you noticed a seasonal drop in colostrum at your farm? What strategies have worked best for keeping your freezer stocked?