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Hidden Dangers in Spring Pastures: What Every Dairy Farmer Should Know

Liepa
Hidden Dangers in Spring Pastures: What Every Dairy Farmer Should Know

Spring is a busy and exciting time on the dairy, but lush, fast-growing pastures can also hide some serious risks for our cows. High sugar and low fibre in new pasture can trigger ruminal acidosis, especially for high-producing cows or those recently transitioned from conserved or grain-based diets. This can show up as reduced appetite, milk drops, loose manure, lameness, and even more serious health issues if left unmanaged.

Other common spring challenges include milk fever (low calcium), grass tetany (low magnesium), and nitrate/nitrite poisoning, all of which can affect herd health and productivity if not carefully managed. Rapidly growing pasture, fertiliser use, and weather conditions can all increase the risk.

Some practical strategies to keep your herd safe include:

  • Introduce cows gradually onto new pasture, avoiding hungry animals getting first access.

  • Offer dry hay or straw to boost effective fibre.

  • Supplement calcium and magnesium where necessary, particularly during high-risk periods.

  • Test pastures for nitrates if fertilisers have been applied and avoid grazing high-risk paddocks until safe.

Keeping on top of these risks now means healthier cows, more stable milk production, and fewer health setbacks throughout spring and summer.

What strategies do you use on your farm to safely transition cows onto lush spring pastures?

Parents

  • Well, we always take it slow when turning cows out in spring. If you just throw them straight onto the lush stuff, you’re asking for trouble. I like to let them out for a couple of hours at first and still keep silage or hay in front of them, so they don’t gorge themselves. I also make sure they’re not too hungry before hitting the paddock. We’ll usually put some extra magnesium in the minerals or water, and keep an eye on calcium for the fresh cows. If the grass has been pushed with fertiliser, I’m a bit more cautious, sometimes I’ll wait or test it if I’m unsure. It’s all about easing them in, keeping fibre up, and watching the cows closely for any signs things aren’t sitting right

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  • Well, we always take it slow when turning cows out in spring. If you just throw them straight onto the lush stuff, you’re asking for trouble. I like to let them out for a couple of hours at first and still keep silage or hay in front of them, so they don’t gorge themselves. I also make sure they’re not too hungry before hitting the paddock. We’ll usually put some extra magnesium in the minerals or water, and keep an eye on calcium for the fresh cows. If the grass has been pushed with fertiliser, I’m a bit more cautious, sometimes I’ll wait or test it if I’m unsure. It’s all about easing them in, keeping fibre up, and watching the cows closely for any signs things aren’t sitting right

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