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Research r...FinishersTrial report 471

Trial report no. 471: 3-phase feeding of finishers with differentiated phosphorus standard

Abstract

A test of 3-phase feeding compared to feeding with one diet throughout the entire growth period (the unit mix for finishers 30-100 kg) has been carried out. The test was carried out in three herds with pigs in the growth interval 32 to 100 kg. Dry feeding was used ad libitum. The test comprised 121 blocks (replicates) and a total of 4,845 produced finishers.

The feed analyses showed 3-6% surplus content of crude protein in herds A and B, and deviations in mineral content in all herds in the interval –7 to +43%.

The results showed that for all herds in general there was no significant difference in the produc-tion value between the control group and the phase feeding group when average prices of 5 years were used. However, phase feeding resulted in a significant decrease in the lean meat percentage of 0.4 percentage units.

In herd A, phase feeding had a significantly negative effect (4%) and in herd B a significantly positive effect (4%) on the production value, whereas in herd C there was no evident effect of phase feeding on the production value. It is likely that the higher production value of phase feed-ing in herd B may partly be due to a deficiency of calcium and phosphorus in the control group, and partly to the concentration of energy being graduated – as opposed to herds A and C – into the lowest level in the final diet. This may improve the lean meat percentage, especially for the castrates when fed ad libitum.

In this test, 3-phase feeding resulted in a reduction of 4.5% in discharge of nitrogen, and of 2.5% in discharge of phosphorus per produced finisher compared to the unit mix (control).

It is problematic to attempt phase feeding when the aim is to reduce protein and phosphorus by 4-5% if or rather when the mixing uncertainty is 5-6% or above. This creates a great risk of a defi-ciency of nutrients of the pigs.

On the basis of this test, phase feeding for finishers is only recommended when it can be conduct-ed without any or only few extra investments as a consequence eg. at multisite and certain liquid feeding systems. Furthermore, thorough analyses of the ingredients and a good mixing certainty are perquisites for phase feeding.

Updated: 25.05.2000

Author

Niels Morten Sloth

Senior advisor

Tel.: +45 8740 5353

E-mail: nms@lf.dk

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