Safeguard is one of the safest... it's used on cats, kittens, dogs, puppies, mares, foals, stallions, cows, calves, bulls, reptiles, goats, sheep, llamas, etc and birds of *all* ages.I was able to get Safeguard equine paste. I think you earlier suggested that was also a gentle wormer, Eggcessive. Hesitating, because I'd have to throw eggs for almost 2 weeks or separate her. Also, our local folks with chickens never worm, and the poultry advisor for 4-H here was very doubtful she would have a load of worms at 22 weeks. But, she is free ranging widely and not improving, so it might be worth a try.
When I have one that's "off", worming is the first thing I do. Lately I've been treating them with Safeguard for five days to be sure to get any capillary worms. The dose I use for that requires weighing the bird and doing a little math

Math used:
Weight in pounds divided by 2.2 (converts to kg) times 50mg divided by 100 (number of mg in one ml). So that looks like this:
3 ÷ 2.2 x 50 ÷ 100 = 0.7ml (rounded up from 0.68181818181).
Source:http://edis.ifas.ufl.edu/ps046
Table 2.
Example of target body weights during the rearing of replacement pullets.
Age
(weeks)
Body weight
(Pounds)
(Grams)
1
0.14
65
2
0.24
110
3
0.40
180
4
0.55
250
5
0.71
320
6
0.88
400
7
1.10
500
8
1.28
580
9
1.50
680
10
1.70
770
11
1.92
870
12
2.09
950
13
2.27
1030
14
2.43
1100
15
2.56
1160
16
2.67
1210
17
2.76
1250
18
2.82
1280
19
2.89
1310
20
3.00
1360
-Kathy
Edited to add:
1ml of paste does weigh 1 gram (yes, I weighed it, lol), so one 25 gram tube of paste has 25ml of paste and each ml of paste has 100mg.

https://www.backyardchickens.com/t/812128/worming-with-horse-wormer
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