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Research r...WeanersTrial report 796

Trial report 796: Soybean meal for weaners

PV dropped when inclusion of soybean meal increased. Up to 35% was gained on the bottom line by using 26-27% soybean meal in weaner feed as the feed price dropped as soybean meal inclusion increased.

Abstract

The effect of increasing the inclusion rate of toasted soybean meal on the productivity of weaners (above 9 kg) was investigated. It was also investigated whether dehulled toasted soybean meal could be used as an alternative to toasted soybean meal.

The pigs were transferred to the trial when they weighed more than 9 kg and finished when they weighed approx. 30 kg. The start weight averaged 10.1 kg and the finish weight averaged 29.3 kg. The pigs were fed one diet through the entire trial period.

Group  Inclusion of soybean meal, %  Soybean meal source 
10  Toasted soybean meal (crude prot. content approx.43%) 
16  Toasted soybean meal (crude prot. content approx. 43%) 
22  Toasted soybean meal (crude prot. content approx. 43%) 
27  Toasted soybean meal (crude prot. content approx. 43%) 
5 10 Dehulled toasted soybean meal (crude prot. content approx. 47%)
26  Dehulled toasted soybean meal (crude prot. content approx. 47%) 

There was a linear correlation between an increasing inclusion of toasted soybean meal and a decrease in the production value. The pigs given the highest inclusion of toasted soybean meal had a production value that was 6% lower than that of the pigs given the lowest inclusion rate. As a result of the high inclusion of soybean meal, the pigs took 1-2 days more to reach 30 kg. When including the current feed prices (spring 2007), the lower productivity is counterbalanced by a better economy, as the pigs given the highest inclusion of toasted soybean meal or dehulled soybean meal had an actual production value that was 34-35% higher than that of the pigs given 10% soybean meal because a high inclusion of soybean meal resulted in a drop in the feed price. There were no differences whether the pigs were given toasted soybean meal or dehulled soybean meal.

There was also a linear correlation between the inclusion of soybean meal and the frequency of treatments for diarrhoea. When the inclusion of toasted soybean was increased by one percentage unit in the interval 10-27%, the frequency of treatments for diarrhoea increased by 0.04 days per pig. There were no differences in the frequency of treatments for diarrhoea regardless of whether the pigs were given toasted soybean meal or dehulled soybean meal. There was no effect on mortality.

If health and productivity are analysed in one index, it is seen that, with the same feed prices, the production value drops slightly when the inclusion rate of soybean meal increases, but due to the large differences in feed prices between the groups, the increased costs are still paid.

It is concluded that pigs above 9 kg are able to produce optimally on a diet in which soybean meal constitutes a large part of the protein sources. It is recommended to investigate gradual increases in the inclusion of soybean meal taking into regard the health level of the herd in question. Furthermore, pigs should be given a gradual transition of 5-7 days from diet 1 to diet 2 with a content of high soybean meal. 

 

Updated: 24.09.2007

Author

Hanne Maribo

Chief scientist, PhD

Tel.: +45 3339 4390

E-mail: hma@lf.dk

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