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Research r...FinishersTrial report 659

Trial report 659: Supply of lysine and threonine to finishers

The standard of 7.4 g st.dig. lysine per FUgp is maintained, while the standard for threonine is increased to 4.9 g st.dig. threonine per FUgp. The trial comprised 5,580 finishers.

Abstract

The supply of lysine and threonine to finishers was studied in this trial. The trial was carried out in one herd and comprised a total of 5,580 pigs in nine groups and 62 replicates.

The crude protein level was 130 g standardised digestible crude protein per FUgp in all nine groups. The table below shows the levels of lysine and threonine used in this trial. The remaining essential amino acids and the content of calcium, sodium and digestible phosphorus were min. 10% above the current standards.

Group 5 6 7 8 9 
St. dig. threonine/FUgp, g  4.3  4.4  4.7  4.9  5.3 5.3 5.3 5.3 5.3 
St. dig. lysine/FUgp, g  8.2  8.2  8.2  8.1  8.1 7.7 7.3 6.9 6.4 
Production results 
Production value (PV) per place unit/year  634  642  654  679  669 673 674 650 604 
PV index compared with group 3  97  98  100  104  102 103 103 99 92 

There was a significant effect of increasing threonine content in the feed. This was studied in groups 1-5. The effect was described with a production function that showed that the highest productivity per place unit/year could be achieved at 4.9 g standardised digestible threonine per FUgp.

There was a significant effect of increasing lysine content in the feed. This was studied in groups 5-9. The effect was described with a production function that showed that the highest productivity per place unit/year could be achieved at 7.4 g standardised digestible lysine per FUgp.

Compared with lysine, threonine has a larger effect on the feed intake. On the other hand, lysine affects the lean meat percentage more than threonine.

On the basis of this trial, it can be concluded that the current standard of 7.4 g standardised digestible lysine per FUgp can be maintained, while the current standard of 4.7 g standardised digestible threonine per FUgp ought to be increased to 4.9 g. 

Updated: 26.07.2004

Author

Niels Morten Sloth

Senior advisor

Tel.: +45 8740 5353

E-mail: nms@lf.dk

Author

Hanne Maribo

Chief scientist, PhD

Tel.: +45 3339 4390

E-mail: hma@lf.dk

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