No, it's NOT too much protein and it has the correct amount of niacin for ducklings, as I called the company to verify since it isn't listed on the tag. I raised ducklings without supplementation and without issues, noting Giant Pekin may still need extra niacin. I NEVER switched feeds (due to always having chicks or broody hens/roosters in my flock) The ducks were healthy the entire time.
Angel wing is a poorly misunderstood condition caused by excess calories from ANY source COUPLED with genetics.
Peas can be as much as 22% protein. So that would not lower protein levels compared to the Purina flock raiser. Adding in these extra things actually may unbalance some other nutrients and should be less than 5-10% of the total daily intake. Oats and greens fall in the same category to me as treats. Grass is free choice, free range
Meal worms are VERY high fat.
This is a better guideline (more current and accurate).. Set that book aside.. (I've seen some less preferred but standard hatching advice in it too).
https://www.metzerfarms.com/nutritional-requirements.html
Never go by the picture, PLEASE!
By law in the US, age and species the feed is appropriate for is listed somewhere on the back near the feeding instructions. on the Purina Flock Raiser it states..
"Feed Purina® Flock Raiser® as the sole ration to chickens, ducks and geese from hatch until laying age (about 18-24 weeks)"
No doubt it suggest more calcium at that point. Which some will switch to "layer" feed, and is when I just add free choice oyster shell on the side for active layers.
Hope you are enjoying BYC!