Abstract
The investigation was made to determine to what extent soybean meal and fish meal protein in the diet of laying hens can be replaced by Eurolysine bacterial protein, a by-product of lysine fermentation, or with Pekilo protein. In a 24-week laying trial the inclusion levels of Eurolysine in the diet were 0-4.0- 7.9- 11.9 % and those of Pekilo 0-6.3- 12.7 - 18.0 %, or 0-33-66-100 % of the protein supplement. Eurolysine contained 68.5 % crude protein 53.5 % true protein and 6.9 % ether extract in DM and the corresponding values of Pekilo were 43.3 %, 38,8 % and 1.4 %. The average laying rates decreased with increasing inclusion of Eurolysine, and replacement of the protein supplement by Pekilo also lowered egg production, but the differences between the treatments were not significant (P > 0.05). Feed intakes were increased (P < 0.05) by inclusion of SCP. Feed conversion efficiency did not differ significantly among the treatments (P > 0.05). Mortality increased with inclusion of both types of SCP in the diets, but the principal cause of death was cannibalism.
Highlights
In recent years there has been a great deal of interest in the development of single cell proteins (SCP) from yeasts, fungi and bacteria grown on various substrates
The chemical composition of the feed ingredients and the experimental mixtures is presented in Tables 2 and 4
The crude protein (CP) content of Eurolysine, 68.5 %, was lower than that given by the manufacturer, 76 % of DM
Summary
In recent years there has been a great deal of interest in the development of single cell proteins (SCP) from yeasts, fungi and bacteria grown on various substrates. In these experiments at least half of the protein supplement could be of microbial origin without adverse effect on production or feed conversion. This report concerns the performance of layers in a feeding trial in which soybean and fishmeal protein were gradually replaced by Eurolysine or Pekilo protein. The crude protein (CP) content of Eurolysine, 68.5 %, was lower than that given by the manufacturer, 76 % of DM.
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