Comment by aziaziazi

10 hours ago

Speaking of deforestation:

> Globally, 77% of soya is produced for animal feed, 19.2% for direct human consumption and 3.8% for industry (biodiesel, lubricants, etc.).

https://www.deforestationimportee.ecologie.gouv.fr/en/affect...

Poultry protein efficiency is 21% and beef 3%

> We find that reallocating the agricultural land used for beef feed to poultry feed production can meet the caloric and protein demands of ≈120 and ≈140 million additional people consuming the mean American diet, respectively, roughly 40% of current US population.

https://iopscience.iop.org/article/10.1088/1748-9326/11/10/1...

Edit:

Note the soy usage vary around regions. The first link is from a French gov page, after the previous citation it gives the world repartition:

> In animal feed, the largest consumer of soybeans is chicken (37% of world production), followed by pork (20.2%), aquaculture products (5.6%), dairy products (1.4%) and beef (0.5%).

Which is quite different than the French reparation :

> flesh and egg poultry account for 44% of total [imported] soy, then diary/mixed cows (36%) then flesh cow (8%) and pigs (6%)

(fr) https://chaire-bea.vetagro-sup.fr/en-france-les-animaux-dele...

Soy protein are 97.9% as digestible as beef

> protein qualify can be scored in terms of its Protein Digestibility-Corrected Amino Acid Score (PDCAAS). Soy achieves a PDCAAS of 0.92, comparable to beef at 0.94.

https://ourworldindata.org/land-use-diets

The DIAAS is sensibly worse (soy 0.898 - beef 1.116) but still far from the beef protein efficiency cited above (3%)