Heat Detection and Breeding Management

Spotting the Heat: Reading the Sow’s Body Language

A sow comes into “heat” every 21 days. If you miss this window, you have to feed her for another three weeks for free. To be a successful agripreneur, you must become a “Pig Whisperer.”

The Three Stages of Heat:

1. Coming into Heat: The sow becomes restless. She may try to jump on other pigs. Her “vulva” (the outer part of her private area) starts to swell and turn pink/red. She will make a lot of noise but will not stand still if you push her.

2. Standing Heat (The Money Window): This is the critical stage. The swelling of the vulva may go down slightly, but there is a sticky discharge. Most importantly, she will perform the “Standing Reflex.” If you apply pressure to her back with your hands, she will stand rock-still, prick her ears, and refuse to move.

3. Going out of Heat: She loses interest and will fight off the boar if he tries to approach.

The Teaser Boar and the Back-Pressure Test

The best way to find out if a sow is ready is to let her see or smell a boar. Even if you use AI (Artificial Insemination), having a boar nearby (even through a fence) helps “trigger” the sow’s hormones.

• The Test: Walk behind your sow and press your hands firmly on her lower back/hips. If she arches her back and stands like a statue, she is ready. If she runs away, she is not.

Natural Mating vs. Artificial Insemination (AI)

As Africa modernizes, farmers have two choices for the “meeting.”

Agripreneur Advice: If you are near a town with an AI service (like many parts of Central and Rift Valley Kenya), use AI! It allows a small farmer to get “Champion” piglets without the cost of keeping a huge, hungry boar.

The Timing Strategy: The 12-Hour Rule

Don’t mate the sow the very second she shows signs of heat. The eggs are released toward the end of the “Standing Heat” period.

• The Pro Method: Mate/Inseminate the sow 12 hours after you first see her “stand still,” and then repeat the process 12 hours later. This “double service” ensures there is plenty of sperm waiting when the eggs arrive.

Selecting Your Mate (The Boar)

If you choose natural mating, your boar is 50% of your future herd.

• Never use a Village Scavenger boar. You will get slow-growing, thin piglets.

• Look for Libido: A good boar should be excited to work.

• Age Matters: A young boar (8–10 months) shouldn’t handle more than 2 matings a week. A mature boar (over 1 year) can handle up to 5.

Case Study: The Blind Farmer in Nakuru

Farmer Beatrice had 5 sows but only got about 30 piglets a year. She complained that her sows were “barren.” An expert visited and realized Beatrice only checked her pigs once a day – in the morning when she fed them. Pigs often show heat signs in the cool of the evening. The expert told her to check them at 6:00 PM with the “Back-Pressure Test.” In the next month, she caught three sows in heat that she would have missed. Her piglet production jumped from 30 to over 100 per year, simply by changing her “checking” schedule.

The Mating Record (Mandatory)

You cannot rely on your memory. Every time a sow is served, write it down:

• Sow Name/ID: (e.g., “Big Ears”)

• Date of Mating: (e.g., 10th Feb)

• Expected Farrowing (Birth) Date: (Add 3 months, 3 weeks, and 3 days – roughly 114 days).

• Boar/AI Source: (e.g., “Duroc AI Batch #402”)

Important things to keep in mind:

• The 3-3-3 Rule: A pig’s pregnancy lasts 3 months, 3 weeks, and 3 days. If you mate her today, mark your calendar exactly 114 days ahead.

• Keep the Peace: Mating should happen in a quiet area. If there is too much noise or hitting, the sow will get stressed and won’t conceive.

• The Return to Heat Check: 21 days after mating, check the sow again. If she shows signs of heat again, the mating failed. If she is quiet and her belly starts to drop, she is likely pregnant.