When it comes to buying needles there are some helpful tips to keep in mind.
Needles are measured in 2 ways: Length & Gauge (Diameter). When determining the correct gauge, remember the higher the number, the small the diameter. For example a 18 gauge needle is smaller than a 16 gauge needle.
Needle Size & Selection:
| Gauge | Length | |
| Poultry | 22 | 3/8" x 1/2" |
| Baby Pigs (IM) | 20 | 1/2" |
| Nursery Pigs (IM) | 16 or 18 | 3/4" or 5/8" |
| Sows/Boars (SUBQ) | 16 or 18 | 1" |
| Calves (<300 lbs) (SUBQ) | 18-20 | 1/2" x 3/4" |
| Cattle (IM) | 16 or 18 | 2/4 or 1 1/2" |
| Sheep/Goat | 20 to 22 | 1/2" or 1" |
| Horses | 18 or 20 | 1" |
| Small Animals (All Ages) (SUBQ) | 20-22 | 1/2" |
| Small Animals (All Ages) (IM) | 20-22 | 3/4" or 5/8" |
IM - Intermuscular (neck area)
SUBQ - Subcutaneous (neck area preferred method)
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