have a 6 1/2 yr. old + male pekin duck that has alternately had a pale/bright orange beak. currently pale for last year or so. it also went thru period of having a break in in(not severe-he ate,etc fine)he is fed 16 % with the female I have(she currently has a swollen warm joint and have been floating her but?) his trouble started before I erroniously gave them calcium for her egg laying(I now do NOT give them calcium because she has joint issue, I screwed up) so I don't know why he could be pale. any thoughts? he acts great otherwise.