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Sheep special: Meeting the challenge of finishing organic lambs without concentrates

Organic farmer, Matt Ridley, has finished his lambs without concentrates for the past seven years achieving the top two grades on forage and grass alone. Ann Hardy reports.

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Matt Ridley keeps 1,000 Texel cross Lleyn ewes in an organic system
Matt Ridley keeps 1,000 Texel cross Lleyn ewes in an organic system
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Sheep special: Meeting the challenge of finishing organic lambs without concentrates

Finishing lambs without a single grain of concentrate feed is impressive by any standards, but doing so under an organic system demands even more care with sheep forages and breeds. If all goes to plan, Northumberland farmer Matt Ridley will achieve this for his 2020 lamb crop, just as he has done for the past seven years.

 

Mr Ridley keeps 2,000 ewes in his hefted flock at the top of the Coquet Valley in the Cheviot Hills, but it is his 1,000-head lowland flock, kept on the home farm at Aydon North, Corbridge, in the Tyne Valley, which is produced to organic standards.

 

Growing as much feed as possible on-farm is a key priority.

 

Mr Ridley says: “As anyone who has tried to buy organic protein knows, the price is horrendous.”

 

To this end, he concentrates on growing swards containing high protein red or white clover, producing silage with minimal waste while maximising nutrient retention and introducing sheep breeds which are proven to do well on forage and grass.

 

Almost all lambs hit the target grade of U3L or E3L with an average carcase weight of 20kg.

 

Lambing will start on March 20 this year, as it did in 2019, and will run for just one month. The earliest single lambs are drawn off for sale in July and a gradual flow of twins and triplets is usually sold through to mid-December.


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Targets

 

The first focus to meeting these targets is maintaining the condition of ewes, considered essential in giving the lambs the best possible start.

 

Mr Ridley says: “Sheep in good condition can cope better with whatever situation they face, including the weather.


“We certainly do not want lean sheep in late pregnancy as you cannot put weight on them after that, when they are putting everything into their lambs.”

 

As such, he has fine-tuned his system, moving ewes from grazed grass on to high quality silage through winter, as conditions dictate.

 

“The ewes will be out on silage from tupping, depending on the weather and the amount of grass. This winter we switched to silage later, about mid-December, because we had plenty of autumn grazing.”

 

The key to maintaining their condition during pregnancy is presenting them with quality, palatable silage which ewes will eat in quantity and with ease.

 

Mr Ridley says: “We used to treat silage as belly-fill and made it from old pastures and into big bales. But the sheep did not use it efficiently, rushing for it when it was brought out, spending a lot of time clambering on top of bales to pull out silage, and probably using lots of energy in the process.”

 

Since then he has switched to short-chopped clamp silage, but he has spent several years searching for the most effective method of preservation which conforms to organic standards.

 

“I wanted to use the type of salts-based preservative we know gives a stable fermentation but we were unable to use this under an organic system. So, we continued to try several bacterial inoculants which are organic-approved but, unfortunately, they tended to give us disappointing results.

 

“The silage would often heat up, some had mould at the surface and there was usually some rejection by the stock.”

 

Having exhausted many options, Mr Ridley was advised to try an inoculant containing a specific strain of lactobacillus plantarum in combination with an organically certified, fermentable precursor which produces powerful yeast and mould inhibitors and improves the aerobic stability of silage.

 

Michael Carpenter, northern area sales manager for forage preservation specialist Kelvin Cave, says: “As a homofermentive bacteria, L.plantarum converts sugar to lactic acid, which is the strongest fermentation acid.

Protein

 

This results in a rapid drop in the silage pH which has been proven to ensure maximum retention of true protein and energy.


“It is important to note this is in contrast to heterofermentative inoculants which ferment sugars in a far more inefficient way, producing water and carbon dioxide as by-products, a process completely avoided with this new fermentation pathway.”

 

The result, according to Mr Ridley is a stable, palatable product which keeps fresh for days and produces high dry matter intakes.

 

“We feed it to ewes in trailers every three days and it stays completely cold and fresh during that time,” he says.

 

Anything left is fed to the farm’s cattle when it still remains palatable and cold.

 

Because of its long-lasting qualities it is effectively available to ewes ad lib, which has led to a noticeable increase in dry matter intakes, less of a rush for food and a more contented flock.

 

Mr Ridley says: “By the end of gestation the ewes are in good condition and receive just a small amount of home-grown concentrates for the final four weeks.


“We find if they are in good condition in late pregnancy the lambs get off to a good start and never look back.”

At the earliest opportunity, lambs are moved for rearing and finishing on to high quality swards, all of which include either red or white clover.

 

Mr Ridley says: “We grow the best grass varieties we can and reseed every five to seven years. But there is a limit to how much red clover we can grow as we cannot tup ewes on red clover because of its negative effects on fertility.”

 

Red clover is often undersown with an arable silage, such as a barley, oat and pea mix. This will usually be wholecropped in August and the undersown clover used for autumn grazing the lambs.

 

“We will only graze it lightly in autumn, just to encourage tillering. We will return to it the following spring and possibly again the following autumn.”

 

With only one cut of silage taken in June, there is plenty of grazing for fattening the lambs.

Aberfields were introduced to the Texel cross Lleyn ewes to improve grass usage
Aberfields were introduced to the Texel cross Lleyn ewes to improve grass usage

Sheep breeds

 

Equal attention has been given to the replacement breeding programme, with the same aim of maximising performance from forage and grass. For the past four years, this has involved the use of Aberfield rams on the Texel cross Lleyn lowland flock.

 

Mr Ridley says: “These rams have been bred to perform on grass and would have been removed from the breeding programme if they did not do so. I buy them as shearlings and when they arrive, it is clear they have never seen a bag of feed.

 

“We use one ram per 30-40 ewes despite their mating capacity of 80-100, as it is important for us to lamb in a tight block.”

 

Selecting his rams on estimated breeding values, he says he has focused selection on maternal traits.

 

“We want a reasonable but not excessive lambing percentage, good maternal ability and a relatively lightweight ewe, as the larger animals require more feed for maintenance,” he says.

 

While building up his closed flock of breeding ewes to include the Aberfield bloodlines, also using the Aberfield SR which includes some Lleyn blood, he continues to use a Texel ram as a purely terminal sire.

 

Lambing percentage was 190 per cent for the March 2019 crop, which was recorded through a benchmarking service against other organic flocks with the University of Newcastle.

 

“This year we hope for a similar outcome for the 2020 lambing,” he says. “We do not want to scan at more than 200 per cent as this means we will have too many triplets.”

 

Performance

 

With the start of lambing less than a month away, he plans a few changes he hopes will further improve performance, including a lower stocking rate when the ewes lamb outdoors.

 

He says: “We normally lead the lambs in to spray navels and ring tails and once they have sucked we turn them back out. But this year we are going to try a simpler method and hope that keeping them on a larger area will reduce mismothering and incidence of infectious diseases, such as watery mouth and joint ill.

 

“All going to plan, this will be less labour intensive and, if the weather permits, we will not bring them in for lambing at all.”

Aydon North farm facts

  • Lowland organic farm of 325 hectares (800 acres) and 1,000 Texel cross Lleyn ewes
  • Run in conjunction with 1,620ha (4,000 acre) hill farm of 4,000 ewes and suckler herd
  • Also run Limousin/Luing/Shorthorn sucklers and grow organic seed barley
  • Lamb lowland flock for one month from March 20
  • Ewes fed clamp silage through pregnancy as grazing declines
  • Organically certified silage inoculant used to optimise fermentation, aerobic stability and silage quality
  • Lambs make E and U grades and 20kg carcases, all produced from grazing
  • Aberfield breed introduced to Texel cross Lleyn flock to improve grass usage
  • Texel used as terminal sire, with lambs sold to Stephen Kirkup Livestock
  • Top keys to performance are sheep breed, ewe condition and grass/forage quality
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