Abattoir results – 13th January 2009

This year we classed our 2008 “full-blood” Dorper & White Dorper ram lambs and the bottom 30% of that group were sent to slaughter at WAMMCo abattoir, Western Australia.

WAMMCo utilises the Viascan technology and has now commenced a bonus scheme (WAMMCo select) for animals that meet a high “loin and leg yield”. To qualify for the bonus a lamb must be in the top 15% of lambs processed based on their pedicted lean meat yield (LMY) for the combined leg & loin readings.

For 18.1-22kg carcase – LMY > 33.5%

For 22.1+ carcases – LMY >32.6%

47% of Dorper lambs, in the correct weight range, made the selection criteria and recieved the bonus whereas only 22% of the White Dorper lambs made the selection criteria.

The lambs were run on oaten stubble and were introduced to a feedlot for 9 days utilising Milne Feeds “Easy1” pellets.

We compared Dorpers and White Dorpers in the table below.

 

   Dorper  White Dorper  Diff  Total
 Number  101  49    150
 Net hot weight  22.84kgs  21.38kgs  1.46kgs  22.36kgs
 Fat score  2.16  2.22  0.06  2.18
 via leg yield  22.51%  22.28%  0.23%  22.44%
 via loin yield  10.27%  10.03%  0.14%  10.19%
 via shoulder yield  17.55%  17.36%  0.19%  17.49%
 via carcase yield  50.33%  49.68%  0.65%  50.12%
 live weight  48.85kgs  47.05kgs  1.8kgs  48.26
 Dressing %  46.80%  45.49%  1.31%  46.37%
 Average age  270 days  265 days  5 days  
 Bonus lambs 18.1-22kgs  18/35 (51%)  6/28 (21%)    
 Bonus lambs 22.1+kgs  28/62 (45%)  4/18 (22%)    
 Lambs less than 18.1kgs  4  3    
         

When analysing the carcase yields, a difference of 0.65% on a 22.36 kg carcase results in 0.1453kgs of meat @ $17/kg or $2.47 per carcase for the processor.

We also compared the weights vs. the fat score to show that we are able to take a purebred Dorper & White Dorper ram lamb to a heavyweight carcase under grazing conditions and with limited feedlotting

 

 Weight range  Score 4 Score 3  Score 2 Score 1  Total
 16.1-18 kgs      7 (4.7%)    7 (4.7%)
 18.1-20kgs      23 (15.3%)    23 (15.3%)
 20.1-22kgs    3 (2.0%)  36 (24.0%)  1 (0.7%)  40 (26.7%)
 22.1-24kgs    7 (4.7%)  31 (20.7%)    38 (25.3%)
 24.1-26kgs    10 (6.7%)  19 (12.7%)    19 (12.7%)
 26.1-28kgs    4 (2.7%)  5 (3.3%)    9 (6.0%)
 28kgs  1 (0.7%)  2 (1.3%)  1 (0.7%)    4 (2.7%)
 Total  1 (0.7%)  26 (17.3%)  122 (81.3%)  1 (0.7%)  150 (100%)
           

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