Some interesting numbers. See links below.
https://feedtables.com/content/fish-meal-protein-65https://www.sites.ext.vt.edu/newsletter-archive/dairy/2006-07/phosphorus.htmlThe Dry Matter % of P in fish meal is ~2.86. So if a feed is 1% P it probably contains less than 1/3 Fishmeal. Since fishmeal averages 65% protein, the fishmeal contribution to protein would probably only be 21.66 or little over half of a 40% protein feed. This would mean that 67% of weight of the feed must contain 18.33% of the total or be 27% protein itself. This could come in part from meat byproduct or soybeans. It would probably mostly come from one or both of these two sources. Both are relatively low in phosphorus but each have some and so do other materials. So a 1% P feed probably doesn't contain fishmeal as the primary component by weight. In the end, does it convert to fish and are you satisfied ... that's what matters. They continue to break ground on fish meal replacements and this can only help reduce P loading.
