Swedish research looking at early feed access in chicken starter diets has found it can be used to improve growth performance in broilers. But it found algal extract supplementation did not affect growth performance or gut health.
The study looked to evaluate early feed access and algal extract on growth performance, organ development, gut microbiota and vaccine-induced antibody responses.
Hatching concepts such as on-farm hatching provide an opportunity to supply newly hatched birds with optimal nutrition that support growth and development of a healthy gut. Brown algae contain bioactive compounds, especially laminarin and fucoidan that may boost intestinal health and immune responses.
A total of 432 Ross 308 chicks were allotted to 36 rearing pens in a 2×3 factorial design with 2 hatching treatments and 3 dietary treatments.
The results showed that although the algal extract did not influence gut microbiota or vaccine-induced antibody responses, they showed that during the first 38 hours, early-fed chicks consumed an average of 19.6g of feed and gained 27% in BW, while late-fed chicks lost 9.1% in BW which lowered BW and feed intake throughout the study (P<0.05).
Late chicks also had longer relative intestine, high relative (g/kg BW) weight of gizzard and proventriculus but lower relative bursa weight on day 6 (P<0.05%). No effects of hatching treatment on microbiota or antibody response was detected. The microbiota was affected by age, where alpha diversity increased with age.
In conclusion, the study showed that early access to feed but not algal extract improved the growth performance throughout the 40-day growing period, and stimulated early bursa development.
The research, published in the journal Animal was carried out by researchers at the Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, Uppsala; the Department of Microbiology, National Veterinary Institute, Uppsala and the Department of Marine Sciences, University of Gothenburg – Evaluation of early feed access and algal extract on growth performance, organ development, gut microbiota and vaccine-induced antibody responses in broiler chickens – ScienceDirect