Obstetric and Calving Instruments: Chains, Handles and Calf Pullers Explained

Chains and handles: material, length, and the placement that actually matters

An OB chain is typically stainless steel and sold in a handful of standard lengths — commonly 30", 45" and 60" — alongside a separate OB handle, roughly 1/2" in diameter with a poly-coated grip, that clips onto the chain for two-handed traction. The detail that matters far more than material or length is placement: the safe technique is a double half-hitch, one loop just above the fetlock joint and a second just above the hoof, positioned on top of the leg rather than underneath or to one side. Spreading the pull across two points along the strongest line of the leg bone is what keeps a difficult pull from breaking a leg or cutting off circulation — a single loop concentrates all the tension in one place instead.

The calf puller: steady traction, not a fix for malposition

A calf puller (calving jack) is a mechanical-advantage device that applies steady, controlled traction without the puller slipping or the jack backing itself off mid-pull. Used correctly, it works with the cow's own pushing rather than around it — counter-thrust against the cow's hindquarters helps spread the pelvis and elevate the abdomen as part of the natural birthing motion. What it doesn't do is fix a malpositioned calf: it's an aid for a correctly presented delivery that simply needs more consistent force than hands alone can supply, not a substitute for correcting the calf's position first.

Fetotomy tools: a separate, more invasive category

Fetotomy (embryotomy) tools are a separate, more invasive category reserved for a fetus that cannot be delivered normally — most often one that is dead or too severely malpositioned to correct. A full set typically includes a fetotome, a saw wire, a wire guide and an embryotomy knife, sometimes alongside a Krey hook for repositioning or assisting delivery of a fetal abnormality. These aren't routine calving-kit items, and a buyer whose scope includes this more clinical end of bovine obstetrics should specify it separately from a standard chains-and-handles order.

A genuinely seasonal line — plan orders around it

This SKU line carries a genuinely seasonal demand pattern rather than a flat, year-round order curve, tied to when herds in a given market are actually calving — the catalogue's own internal seasonality notes flag it for exactly this reason, and its MOQ (10 pcs) runs lower than most other veterinary lines, consistent with smaller, more timing-sensitive order batches rather than steady bulk stock-up. Ordering with a market's calving season in mind, rather than on the same schedule as unrelated SKUs, avoids stock arriving after the season it was needed for has already passed.

What to specify in an RFQ

• Chain length needed (30", 45" or 60") and the number of separate OB handles
• Whether a calf puller is required alongside chains and handles, or chains/handles only
• Whether fetotomy/embryotomy tools are in scope — these are specified and priced separately from a routine chains-and-handles kit
• Steel grade and finish (see our steel-grades guide)
• The target calving season in the destination market, since this line's demand is seasonal rather than constant