I have nine 13-14 week old RIRs. Can I switch them to layer feed at this age? Thanks.
Keshavarz (1987) did a study where he found it was okay to give 3.5% calcium (standard layer amount) at 14 weeks and claimed everything went well with eggs and kidneys.
Leeson and a few others in 86-87 reported that starting with 3.5% calcium at 19 weeks was great timing also for the eggs and the kidneys.