Ram Management and Tupping: Ratios, Raddles and Cycle Timing

Every ewe contributes half the genetics of one lamb crop. The ram contributes half the genetics of all of them, and he is also the single point of failure that can turn a whole season into an empty shed. Yet rams routinely get less attention in the eight weeks before tupping than the ewes get in a fortnight.

Tupping is not simply a matter of opening a gate. It is a planned six-week block with a preparation phase, a ratio decision, a marking system and a set of dates that you will rely on right through to lambing.

Preparing the ram: start eight weeks out

Sperm takes roughly seven weeks to produce and mature. Anything that knocks a ram, illness, lameness, heat stress, a sudden diet change, shows up in his fertility about six to eight weeks later. That is why ram preparation begins two months before you need him.

Work through the five Ts:

• Toes, feet trimmed, sound, no lameness. A lame ram will not work, however fertile he is.
• Teeth, a ram who cannot eat cannot hold condition through six weeks of hard work.
• Testicles, firm, even, freely moving in the scrotum, with no lumps or hard spots. Scrotal circumference correlates with sperm output; bigger is generally better within a breed.
• Tone, body condition score around 3.5-4.0 at ram-in. He will lose a full score or more during tupping.
• Treat, vaccinations up to date, worming and fluke treatment as your health plan dictates, and quarantine any bought-in ram properly before he joins the flock.

A veterinary fertility examination, a physical check plus semen assessment, is money well spent, especially on a single-ram flock or on a ram working his first season. Do it eight weeks out, so you still have time to buy a replacement.

Ram-to-ewe ratios

There is no single correct ratio; it depends on the ram’s age, the terrain, the length of the mating period and whether the ewes have been synchronised.

Situation	Guide ratio (rams : ewes)
Mature ram, good ground, natural cycling	1 : 40-50
Mature ram, hill or extensive ground	1 : 30-40
Ram lamb / shearling (first season)	1 : 15-25
Synchronised or sponged ewes	1 : 8-12
Very compact 17-day mating block	Increase ram power by ~50%

Two principles matter more than the exact number. First, synchronised ewes need far more ram power, because the whole group comes into heat at once. Second, never run a single ram alone with a large group, if he is subfertile, you find out at scanning, and by then it is too late.

Teasers and the ram effect

Ewes exposed to a ram after a period of complete isolation from males will often cycle earlier and more tightly. This is the ram effect, and it is a genuinely useful, cheap tool.

• Keep ewes completely out of sight, sound and smell of rams for at least four weeks beforehand.
• Introduce vasectomised teaser rams (or, at a pinch, a ram wearing an apron) at a rate of about 1 to 20-30 ewes.
• Most ewes will show a silent first heat, then come into a fertile heat, giving a pronounced peak of matings from around day 17 to day 24 after the teasers go in.
• Remove the teasers and put the entire rams in about 14 days after the teasers, so they are in place for the fertile heats.

The effect works best at the start and edges of the natural breeding season, and is weakest deep in the season when ewes are already cycling strongly.

Raddle and crayon marking: the system that saves lambing

A ram wearing a marking harness with a coloured crayon, or dressed with raddle paste on the brisket, leaves a colour on the rump of every ewe he serves. This is the highest-value fifteen minutes of work in the whole tupping period.

The system:

• Change the crayon colour every 16-17 days, matching the ewe’s oestrous cycle length (roughly 17 days).
• Go from light to dark, yellow, then green, then blue, then red, so a second mark always shows over the first.
• Record marks at each colour change, not just at the end.

What it gives you:

• A service date for every ewe, and therefore an accurate lambing date. Feed those dates into the Sheep Gestation Calculator to get an expected lambing date and the 142-152 day window around the 147-day average.
• Lambing groups. Ewes marked in cycle one lamb in week one. You can house them separately and feed them separately.
• An early fertility warning. If a large proportion of ewes carry a second mark, they returned to service, which usually means a ram problem, not a ewe problem. Investigate immediately rather than waiting for scanning.
• A cull list. Ewes never marked at all, or marked repeatedly, are flagged before you spend a winter feeding them.

Length of the tupping period

• Two cycles (34-35 days) gives a tight lambing block: most ewes lamb inside about three weeks.
• Three cycles (about 51 days) catches more of the stragglers but stretches lambing accordingly.
• Longer than three cycles rarely earns its keep; ewes that have not held by then are usually best culled.

Tight blocks concentrate labour, make batch feeding straightforward and produce an even lamb crop. They also demand more ram power and better ewe condition.

During and after tupping

• Check rams every few days. Look for lameness, loss of condition, an empty crayon holder, or a harness rubbed raw. Swap crayons before they run out.
• Watch for a ram who has stopped working. If ewes are cycling and nothing is being marked, act.
• Feed the rams. They will run themselves down hard. Offer supplementary feed if grass is short.
• Minimise stress after ram-out. Avoid heavy handling, long transport and abrupt feed changes in the first three weeks, when embryo losses are most likely.
• Record everything. Ram identity, group, colour changes and dates. Those records are the foundation of the entire lambing plan.

Get the ram right, get the ratio right, raddle him, and the rest of the year becomes a matter of arithmetic. Put your recorded service dates into the Sheep Gestation Calculator and you will know when to scan, when to vaccinate, when to step up feed and when to be in the shed.

This article is general husbandry guidance, not veterinary advice. For decisions about a specific animal or flock, speak to your vet.

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Plan your lambing dates: use the free Sheep Gestation Calculator to turn a breeding date into an expected lambing date, a 142–152 day window and a full milestone timeline. Estimates only, always consult a veterinarian for animal-health decisions.

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