Unsaon Pag-Inject sa Baboy? Pig Injection Guide

If you raise pigs, you will inject pigs. Iron for piglets on day 3, dewormer every quarter, vitamins before farrowing, antibiotics when something goes wrong. Most backyard farmers in Visayas and Mindanao learn injection technique from watching a neighbor. Some learn the hard way: bent needles, abscesses, or medication that doesn't work because it went in the wrong spot.

This guide covers the basics. Not veterinary advice on what to inject, but how to inject correctly so the medication actually works.

Where to Inject: The Neck Rule

Always inject in the neck, behind the ear, in front of the shoulder. This applies to both intramuscular (IM) and subcutaneous (SC) injections.

Never inject in the ham (pigi) or loin (lomo). Those are the most expensive cuts. Injecting there causes bruising, scarring, and tissue damage that downgrades the meat at slaughter. Every major swine extension program worldwide recommends the neck, and DA Administrative Order No. 41 requires that injections follow proper site protocols.

For piglets (SC iron injection): The loose skin on the inner thigh or behind the elbow works. These areas are easier to access on a squirming 3-day-old baktin.

Needle Size by Pig Age

Using the wrong needle is the most common injection mistake. Too short and the medication stays in the fat layer instead of reaching the muscle. Too thick and you cause unnecessary pain and tissue damage.

Source: Cornell Cooperative Extension and Pork Information Gateway.

Cost in the Philippines: A reusable 10-20 mL veterinary syringe with a dozen stainless steel needles runs ₱385-700 on Lazada or Shopee. Disposable sets cost a bit more. You'll also find injection kits at mangk.ph for around ₱350-600 depending on the set.

How to Give an IM Injection (Step by Step)

Intramuscular injections go into the muscle. Most pig medications are IM: antibiotics, vitamins, dewormers.

1. Restrain the pig. For piglets, hold them firmly or have a helper hold them against their body. For growers and finishers, use a pig snare on the upper jaw, or corner the pig in a small pen. Don't chase the pig around, it stresses them and makes injection harder.
2. Find the injection site. Place your finger behind the base of the ear and move about 5 cm toward the shoulder. That's your spot, the neck muscle.
3. Clean the site. Wipe with a clean cloth. If the pig is muddy, clean the area first. Injecting through dirty skin pushes bacteria into the muscle.
4. Pull the skin slightly forward with your free hand. Insert the needle at a 90-degree angle, straight into the muscle. Release the skin.
5. Pull the plunger back slightly. If blood enters the syringe, you've hit a vein. Pull out, change the angle, and try again. No blood = you're in the muscle.
6. Inject slowly and steadily. Don't slam the plunger. Steady pressure reduces tissue damage.
7. Remove the needle and release the skin. The skin springs back over the puncture, sealing the medication in the muscle.

Sus, that skin-pull trick makes a big difference. Without it, medication leaks back out of the hole. We see this a lot with backyard farmers who wonder why the ivermectin "didn't work." It worked. It just ended up on the pig's skin instead of in the muscle.

How to Give an SC Injection

Subcutaneous injections go under the skin, not into the muscle. Some vaccines and certain medications specify SC.

1. Pinch a fold of loose skin behind the ear (for sows) or at the flank/elbow area (for piglets and growers).
2. Insert the needle at a 30-45 degree angle into the base of the skin fold.
3. Slide the needle forward slightly under the skin before injecting. This keeps medication from leaking out.
4. Inject, remove, release the skin fold.

SC is easier than IM, honestly. Less precision needed. But don't use SC when the label says IM, the absorption rate is different and the medication may not work properly.

Common Injectable Medications for Philippine Backyard Pigs

This is not a prescription guide. Always follow your vet's instructions on dosage and frequency. Most injectable medications dose by body weight, so know your pig's weight before drawing up the syringe. These are the injectables you'll encounter most often:

Iron dextran example: A 100 mL bottle of Iron-Vet at ₱602 gives you 100 doses at 1 mL per piglet. If your sow has 10 piglets, that's about ₱60 for the litter, or ₱6 per piglet. On a tighter budget? Daviron Plus runs ₱297 for the same 100 mL, which cuts that to ₱3 per piglet. For a medication that prevents the leading cause of early piglet death, that's nothing.

Withdrawal periods matter. If you're selling a pig within the next month, check the table above. Ivermectin has a 28-day withdrawal, oxytetracycline 21 days. Iron and vitamins have zero withdrawal. Selling a pig with antibiotic residue gets your buyer in trouble and gets you cut from their list.

Mistakes That Cause Problems

1. Injecting in the ham. Ruins the most valuable cut. Always neck. Always.
2. Reusing needles without cleaning. Spreads disease between pigs. At minimum, change needles between sick and healthy animals. Ideally, use a fresh needle per pig.
3. Bent needles. If a needle bends during use, throw it away. Never straighten and reuse a bent needle. It can break off inside the pig.
4. Wrong needle length. A 1 cm needle on a 90 kg finisher only reaches subcutaneous fat, not muscle. The medication sits in the fat layer and absorbs poorly. Match needle length to pig size using the table above.
5. Not restraining the pig properly. A pig that jumps during injection can drive the needle deeper than intended or break it. Spend 30 seconds on restraint. It saves problems.
6. Injecting too much in one spot. For large-volume injections (10+ mL), split the dose between two sites on opposite sides of the neck. More than 10 mL in one spot causes swelling and poor absorption.

Needle Disposal

Used needles are sharps. Don't throw them in the regular trash where someone steps on them or a kid picks them up.

Put used needles in a thick plastic bottle (an old detergent bottle works, not glass). When the bottle is about three-quarters full, seal it with tape and label it "used needles." Most municipal health offices accept sharps with medical waste, or ask your vet where to drop them off.

And don't stockpile used needles in a coffee can on a shelf. We've heard too many stories of accidental needle sticks from that setup.

Learn More

• How to deworm pigs: ivermectin dosing and schedule
• Signs your pig is sick: when to call a vet vs treat yourself
• Why piglets die in the first week: iron deficiency and other causes
• How to estimate pig weight: get dosing weight without a scale
• Common pig diseases: symptoms, causes, what to do

Sources:

• Pork Information Gateway: Proper Injection Techniques: needle sizes, injection sites, technique
• Cornell Cooperative Extension: Injection Techniques for Swine: needle gauge table, safety protocols
• ThePigSite: Primary Sites of Injection: IM and SC site diagrams
• DA Administrative Order No. 41: Code of Practice and Minimum Standards for Pigs
• Viddavet: Iron-Vet 100mL: product specs and pricing
• UNAHCO: GenVet Ivermec: ivermectin for swine
• Viddavet: Daviron Plus 100mL: budget iron dextran + B12, ₱297
• Viddavet: Terramycin LA 20mL: oxytetracycline pricing and dosage