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Late lambing flocks – Do not forget to record lamb weights.

These tables are designed to aid breeders in selecting the best time to weigh their LambPlus lambs.

As part of the LambPlus programme breeders are asked to record at least 3 weights for their lambs after lambing at 3 defined points in time as outlined below (Breeders are however free to record as many weights as they wish).

Each of these weights will then work towards improving the flocks accuracy percentage (Acc %) and therefore making the evaluations reflect the performance of the animals on the ground more accurately.

Note: All lambs DO NOT need to be weighed when they are exactly 40, 100, or 150 days of age. If lambs are weighed between the parameters outlined below in Table 1, the Sheep Ireland database will be able to predict the weight of the animal at age.

40 Day Weight Between 20 – 65 days of age
 100 Day (Weaning weight) Between 66 – 120 days of age
150 Day  (Scanning Weight) Between 121 – 180 days of age
* Table 1

Important Weight dates

Table 2 can be referenced by LambPlus breeders to work out the best time to weigh their lambs. The first column displays the lambing date of the first lamb. The dates displayed under each of the weight categories is the last date possible for this lamb to be weighed and still fit into this category.

20 – 65 DAYS
66 – 120 DAYS
121 – 180 DAYS
25th December 28th February 23rd April 22nd June
1st January 6th March 30th April 29th June
8th January 13th March 7th May 6th July
15th January 20th March 14th May 13th July
22nd January 27th March 21st May 20th July
29th January 3rd April 28th May 27th July
5th February 10th April 4th June 3rd August
12th February 17th April 11th June 10th August
19th February 24th April 18th June 17th August
26th February 1st May 25th June 24th August
4th March 8th May 2nd July 31st August
11th March 15th May 9th July 7th September
18th March 22nd May 16th July 14th September
25th March 29th May 23rd July 21st September
1st April 5th June 30th July 28th September
8th April 12th June 6th August 5th October
15th April 19th June 13th August 12th October
22nd April 26th June 20th August 19th October
29th April 3rd July 27th August 26th Octo

Table 2 can be used as a guideline as to when the best time to weigh your lambs.

Simply select the date your first lamb was born then take note of the three dates by which this lamb should have the three required weights recorded at by the latest. This table should be used in combination with table one. For flocks with a spread out lambing pattern (i.e. over two months) then they will need to record their lambs 40 day weights on two different days to ensure the lambs are the correct age at weighing time.