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Heifer Fertility and First Calving

Getting a heifer pregnant on time is only half the job. How she is fed, housed and handled through pregnancy and at calving sets the tone for her whole productive life.

What drives heifer fertility

Heifers generally conceive more easily than lactating cows, which makes poor heifer fertility a useful warning sign. When many heifers fail to settle, look first at growth, health, nutrition and how semen is handled.

Age at puberty depends on growth. A heifer that grows slowly will cycle later. Mineral balance, parasites and disease also play a part, so involve your vet if a group is lagging.

If conception is poor across a whole group, compare what changed: a new semen batch, a different technician, a ration change or an illness in the pen. Looking for the common thread is more useful than blaming individual animals.

• Growth rate and body condition
• Mineral and energy balance
• Disease and parasite control
• Semen handling and AI technique

Pregnancy checks and tracking

Use a pregnancy exam schedule your veterinarian recommends and record every result. Open heifers should be rebred promptly or evaluated, not left in the pen without a plan.

Keep a list of expected calving dates. It helps you plan the move to the maternity area and makes sure nobody is surprised.

Share the results with the people who handle the cattle. When everyone knows which heifers are open, bred or due soon, moves and rebreeding happen on time. A whiteboard in the office or a herd software list both work well.

Preparing the heifer for calving

In late pregnancy, heifers need a ration designed for close-up animals. Ask your nutritionist about formulating one that supports the calf and prepares the cow for lactation without letting her get too fat.

Let heifers get used to the milking routine and the environment before they calve if possible. A calm first experience in the parlor or stall makes a difference.

• Move to close-up group on schedule
• Keep stalls and pens clean and dry
• Walk through the parlor routine early
• Watch body condition, avoid over-conditioning

Signs of calving and when to step in

Learn the normal signs: udder filling, relaxed pelvic ligaments, restlessness and isolation. Check heifers often when calving is near. A heifer in active labor that is making no progress needs help from someone trained.

Have a calving plan with a clear point at which you call the vet. Delay is the biggest risk to both heifer and calf.

The first days after calving

Give the calf colostrum as soon as possible after birth and within the first hours of life. Watch the heifer for appetite, rumen fill, temperature, retained placenta and udder swelling.

Heifers are often lower in the social order, so make sure they reach feed and water and can rest. Fresh heifers deserve the same close attention as any fresh cow.

• Appetite and rumen fill
• Placenta passed normally
• Udder soundness and milk quality
• Calf fed colostrum promptly

Health and records that protect first lactation

A heifer's health history follows her into the milking string. Calfhood disease, poor growth and untreated lameness all reduce what she can do later. A vaccination and parasite plan written with your veterinarian protects the whole group.

Keep an individual record for each heifer: breeding dates, sire, pregnancy results, vaccinations, treatments, calving date and calving difficulty. When a heifer later leaves the herd early, these records help you see what could have been done differently.

Review heifer records at least once a year with your vet. Look at age at first calving, calving difficulty and early lactation disease, and ask whether heifer rearing needs a change.

• Vaccination and parasite plan on file
• Breeding and pregnancy dates recorded
• Calving difficulty scored
• Early lactation health events noted

Common mistakes

Overfeeding in late pregnancy, waiting too long to help a stalled calving and mixing fresh heifers into the herd without a plan are the usual problems. Another is not recording calving events.

If a heifer is treated for any problem, the milk and meat withdrawal times on the label or set by your vet must be followed exactly. Keep treatment records.

Review each calving group once the heifers are in the milking string. Ask how many calved easily, how many needed help, how many had fresh cow problems and how many were rebred on time. That short review is the best guide for next year's changes.

More in Breeding, Genetics & Reproduction

• Calving Ease and Sire Selection
• Dystocia Management on Dairy Farms
• Bull Fertility Testing
• AI Technique Troubleshooting
• Semen Handling and Storage
• Embryo Transfer in Dairy Cattle