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FINISHING LAMBS AT GRASS

Now’s the time of year when upland sheep producers are looking to finish lambs off,
but knowing when to supplement grass to complete the job is not easy.

However, David Thornton from Rumenco points out that there are some general
rules of thumb that are worth bearing in mind. “To supplement, or not to supplement,
that’s the big question when it comes to finishing lambs,” he says.

“Generally, supplementation is most effective when grass is in short supply (less than
4cm sward height), herbage nutritional value is poor or the grazing land has become
too wet or muddy. Sometimes bad weather can restrict grazing and in these
situations it’s important to make sure the supplementary feeding system doesn’t add
to the problem by causing stress to the lambs or poaching around feed sites.”

Increasing cereal and lamb finishing feed prices – and the cost of feeding them out in
terms of time and labour – means some farmers are now considering alternative
methods of supplementing weaned lambs through to finishing.

“However, a proportion of lambs will not eat these types of feed if they have not seen
them before and received training to eat them. There is also a risk of contamination
from wild birds, giving rise to problems such as salmonellosis. A snacker feeder can
reduce labour costs and save time, but can only be justified if it is also used for
feeding ewes,” David Thornton says.

David Thornton points out that feeding home-grown cereals may be attractive, but at
around £150 per tonne many farmers are looking to realise full value for their crop by
selling it on the open market. “In addition, if you are feeding whole cereals to lambs,
it’s important to introduce the grains gradually. Otherwise rumen stasis and
compaction can occur, caused by undigested grains staying in the rumen too long,
which can be fatal.

“Lambs affected by stomach worms and coccidiosis may make poor use of
concentrates with inefficient feed conversion rates. In these cases, some additional
quality protein in the supplement and adequate minerals and vitamins will help
stimulate a higher immune response in such animals to help them deal with such
challenges.”

Many alternative forages and fodders are suitable for finishing lambs. Chicory and
clover mixtures, fodder leaf and root crops are extremely valuable feeds in their own
right and just require simple supplementation using a palatable mineral bucket or
block, rather than additional energy and protein support.

For lambs that need some supplementation at grass, David Thornton says Rumevite
feed blocks offer the ideal solution – and are around £100 per tonne cheaper than
molassed bucket supplements because of the big savings in packaging costs.

“Lambs will only eat what they need to supplement the grass on offer and the
performance data is impressive. Trials with finishing lambs showed that Rumevite
produced gains of 189g/day versus 94g/day for controls, with the Rumevite-fed
lambs finishing in 45 days compared with 82 days for the controls,” he says.

“Rumevite feed blocks are also fully formulated with minerals and vitamins, so any
liveweight gain compromising shortfalls in the grass are mitigated.”

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