How heat detection kit helps cut calving interval by 25 days – Farmers Weekly

A Welsh suckler beef herd’s calving interval has been shortened by 25 days, to 367 days, since measures together with the usage of heat-detection expertise have been launched to enhance fertility.

Sub-fertility in two inventory bulls at Fferm Rhiwaedog, close to Bala, had resulted in a calving interval that ran from February to October, says Dylan Jones, who farms together with his father and brother, Emyr and Aled.

“This brought on issues with managing calving and with grouping shops on the market,” he recollects.

See additionally: How rumen boluses will help handle suckler cow fertility

In addition, the calving interval had prolonged to 392 days.

Farm details: Fferm Rhiwaedog, Gwynedd

Breeding alerts

Through its work as a Farming Connect demonstration farm, the enterprise launched measures to cut back the calving interval.

These included becoming heat-detection collars on its two Welsh Black and Charolais inventory bulls, and tags to the cows, each of which concern alerts of breeding exercise.

In 2021, this measure, together with pre-calving checks, resulted in a shorter calving interval, from March to September, and with 84% of cows calving within the first 4 months. Just 5% calved in August and 4% in September.

Mr Jones says the expertise has been invaluable in promptly flagging up when cows haven’t been served. This is particularly the case when a brand new bull is getting used.

“It means we are able to do one thing about it as an alternative of ready till the day of scanning – previously that might have meant three months misplaced. It offers us peace of thoughts that the bull is doing his job,” he explains.

“Before we used the collars we’d do not know till the day of scanning what number of animals can be in calf, or what number of wouldn’t.”

Cows that haven’t conceived are given a veterinary investigation and, if applicable, ovulation is synchronised with CIDRs (progesterone-releasing intra-uterine units).

Of the 4 animals that had CIDRs inserted within the 2021 breeding interval, just one had repeated.

Dylan Jones (left) and Aled Jones at Fferm Rhiwaedog © Debbie James

Fertility points

Vet Joe Angell, of Wern Vets, who’s working with the Joneses on the challenge, says points generally seen in cows pre-breeding embody endometritis, ovarian cysts and dormant ovaries.

“If there’s a drawback with a cow that we wish to handle, this expertise means we are able to establish that drawback earlier and cope with it,” says Dr Angell.

Post-calving checks are carried out as routine in Rhiwaedog’s herd of primarily Welsh Black cattle.

“Sometimes, if a cow has had a tough calving or has given start to twins, she could have an an infection within the reproductive tract,” Dr Angell says.

“Cows at the moment are checked after they’ve calved to verify they haven’t received an an infection and they’re appropriate to go to the bull.”


The heat detection expertise in use at Rhiwaedog prices £1,095 ex VAT for one collar and 50 tags, plus a £255 annual charge to maintain the system related to the cell phone community.

Tags can’t be reused as every incorporates a microchip with an ID assigned to a single cow.

The expertise was once more used within the 2021 breeding season and has resulted within the predicted calving interval being shifted additional. It started in February and can run by to August, with being pregnant prognosis displaying that just about half the herd – 35 cows – would calve in May.

Because of restricted housing, Mr Jones says the enterprise desires solely a 3rd to calve in February and March; the goal is to get to a degree the place the remaining two thirds calve in May and June.

(*25*) interval

In 2022, the anticipated calving interval will present a slight improve on 367 days, slightly over the meat business goal for calving interval of 365 days.

This is as a result of a number of cows – animals with good pedigree traces which had calved on the again finish of 2020 – weren’t bulled within the following spring, to get them again in sync with the popular calving interval.

Dr Angell says having a compact calving sample has a number of advantages, not least enhancing beef herd effectivity and the consequential chance of upper profitability.

“When a calving interval is prolonged, that cow turns into a price to the enterprise, and the longer the hole between calvings, the tougher it’s to get her in calf,” he says.

There can also be a higher probability that the animal will grow to be too fats and expertise difficulties at calving.

There are main enterprise and welfare advantages to cows being managed on the proper stage, and calves have higher well being if they’re managed on the right stage too, Dr Angell provides.


But the usage of collars isn’t with out its challenges.

Mr Jones experiences points with cows dropping their tags. “When that occurs we don’t know whether or not the cow is bulling or not – that’s one thing we now have to pay attention to.

“It isn’t that a lot of an issue in the summertime, however we now have seen cows usually tend to lose their tags within the winter.”

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