Nutrition and Rebreeding

A cow must recover from calving, make milk and get bred again, all at the same time. Nutrition decides how well she manages that, and the key period is the weeks around calving.

Key points

Rebreeding depends on energy, especially around calving.
Cows put milk and survival ahead of reproduction when feed is short.
Test forage and work with a nutritionist on balanced feed and minerals.
First-calf heifers need separate attention.
Call your vet for unexplained illness or abortions.

The demands on a lactating cow

After calving, a cow's needs rise. She feeds a calf, repairs her reproductive tract and must get back into heat. If feed energy falls short, her body puts milk and survival first, and rebreeding drops down the list.

That is why a cow can look healthy yet fail to cycle on schedule. The cause is often a feed gap in late pregnancy or early lactation.

The calf pulls on her reserves every day, so a cow that is short on feed gives up condition first. Rebreeding is what is left.

Energy first

Energy is the main driver of rebreeding. Feed quality and quantity must meet needs, which depend on the cow's size, age, milk and the weather. Cold, wet or windy conditions raise energy needs.

Ask a nutritionist or extension specialist to balance a ration based on a forage test. Do not guess on hay quality, since appearance can mislead.

Pasture quality changes through the season. Early growth can be high in water and low in dry matter, while late-season grass can be mature and lower in quality, so check what your cattle are actually getting. Rations that look fine on paper can fail if cows cannot reach the feed, so watch how the herd actually eats.

Test hay and forage
Feed for the cow's stage of production
Raise feed in cold or wet weather
Separate thin and young cows

Protein, minerals and vitamins

Protein, trace minerals and vitamins also matter. Deficiencies can hurt fertility, calf health and immunity. Needs differ by region because soils and forages differ.

Ask your nutritionist or extension office about a mineral program for your area. Use products by label directions, and do not mix your own without advice. Feed additives and urea or non-protein nitrogen sources carry risks if misused, so get a nutritionist and your vet involved. This article gives no feeding rates.

Mineral needs differ across regions. Ask your extension office what is commonly short in your area, and have your vet and nutritionist weigh in before you change the program.

Timing around calving

Plan feed so cows are in good condition at calving. After calving, feed enough to support milk and cycling. Many producers move the herd to better pasture or add supplement at breeding.

First-calf heifers need the most attention. They are still growing and have the hardest time rebreeding.

Keep first-calf heifers and thin cows away from the boss cows at the feeder so they can eat their share. Ask your nutritionist when to start feeding extra ahead of calving, since waiting until the cows look thin is waiting too long.

Late pregnancy: protect condition
Early lactation: meet higher needs
Breeding: avoid feed drops
First-calf heifers: feed separately

Water, forage and weather

Clean, ample water is a basic need. Drought, poor pasture or stocking too heavily will cut intake. Watch the pasture and plan for dry spells with stored feed or a lower stocking rate.

Toxic plants, nitrates and mold in feed can harm cows and fertility. If cows show unexplained illness or abortions, call your vet right away.

Plan for a dry year before it arrives. Know what you will do with stocking rate and stored feed if rain is short.

Records and economics

Track feed costs and rebreeding results together. A cheaper feed that lowers pregnancy rate may cost more in the end. Talk to your accountant about how to budget feed and to your extension office about forage options. Costs change, so use current local figures.

Keep body condition scores with the feed records.

If feed costs seem high, look at waste and stocking rate first. Feeding smarter often beats feeding less.

Common mistakes and what to ask

Mistakes include cutting feed late in pregnancy to save money, ignoring mineral needs and feeding unknown forage.

Ask your nutritionist: What does my forage test say? What gaps should I fill? What should first-calf heifers get? Ask your vet about herd health issues that could look like a nutrition problem.

When to get help: Work with a nutritionist or extension specialist on forage testing, rations and minerals, and with your veterinarian on herd health. Contact a vet and nutritionist before using urea, feed additives or unfamiliar feeds.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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