In the past i have used Equvalan horse wormer on birds feeding young, it was advised by the vet.
The young took no harm at all, in fact one went on to race well and breed a RPRA UK Long distance Champion.
56-5=51-6=45 (5x9=45)
21-2=19-1=18 (2x9=18 )
What ever two digit number you use it divides by the number nine.
so all boxes witch divide by nine have the night light in.
I'm not surprised in the slightest Stewart. When i visited Keith almost every bird he gave me to handle were top performers or breeders of top performers.
I don't make a habit of visiting flyers lofts, but one thing i know is i will find it hard to equal the loft visit i had that day.
You should be fine combining treatment as long as the two are compatible, many do it during racing.
At this time of year you have time, so no need to combine treatment in my opinion.