Effect of replacement of soybean meal by rape seed meal plus peas in feed on laying performance of two laying hen strains
In hens’ feed soybean extracted meal (SBM) was replaced by rapeseed (Brassica napus) meal (RSM) (solvent extracted) plus peas in order to investigate the effects on feed intake, laying performance and composition of eggs. A total of 460 laying hens (230 Lohmann Brown-LB/230 Lohmann Dual-LD) were used in the feeding study. The hens were allocated to 4 groups of 115 hens each. The hens were kept in pens (23 hens per pen) with 5 pens per group and fed for six laying months (168 days). The daily feed intake, the number of eggs related to the trial’s days (laying intensity) and egg weight of LB hens was significantly higher compared with LD hens. While amongst all hens no effect of substituting SBM through RSM/peas in the diet was seen on laying intensity, the egg weight was decreased and the feed to egg mass ratio increased. The daily egg mass production was lower in the LB RSM/peas group compared with LB SBM hens and not significantly different between two LD groups. Eggs of LD hens showed a significantly higher percentage of egg yolk and a reduced proportion of egg white.