1. (a) General Provisions.

   1. (1) Guarantees for amino acids should be expressed as percent on feed labels.
   2. (2) Unless indicated otherwise, the amino acids defined below can be added to animal feed for nutritional purposes in accord with good manufacturing or feeding practices.
2. (b) DL-Arginine (21 CFR 582.5145) is a product which contains a minimum of 98 percent racemic 2-amino-5-guanidyl-valeric acid. The percentage of DL-Arginine must be guaranteed.
3. (c) DL-Methionine (21 CFR 582.5475) is a product containing a minimum of 99 percent racemic 2-amino-4-(methylthio)butanoic acid. The percentage of DL-Methionine must be guaranteed.
4. (d) DL-Methionine Hydroxy Analogue (21 CFR 582.5477) is a product containing a minimum of 88 percent racemic 2-hydroxy-4-(methylthio)butanoic acid. The percentage of DL-Methionine Hydroxy Analogue must be guaranteed.
5. (e) DL-Methionine Hydroxy Analogue Calcium (21 CFR 582.5477) is a product that contains a minimum of 97 percent racemic 2-hydroxy-4-(methylthio)butanoic acid calcium salt. The percentage of DL-Methionine Hydroxy Analogue Calcium must be guaranteed.
6. (f) DL-Methionine Hydroxyl Analogue Isopropyl Ester is a product containing a minimum of 90 percent racemic 2-hydroxy-4(methylthio)butanoic acid isopropyl ester monomer for use as a source of methionine activity in cattle diets. The percentage of DL-methionine hydroxyl analogue isopropyl ester monomer must be guaranteed.
7. (g) DL-Methionine Sodium is a product containing a minimum of 45.9 percent racemic 2-amino-(methylthio)butanoic acid sodium salt. The percentage of DL-methionine must be guaranteed.
8. (h) DL-Tryptophan (21 CFR 582.5915) is a product which contains a minimum of 97 percent racemic 2-amino-3-(3-indolyl)-propionic acid. The percentage of DL-tryptophan must be guaranteed. Excessive tryptophan consumption in cattle (in excess of 0.17 grams tryptophan per 100 pounds bodyweight per day) is associated with bovine pulmonary emphysema.
9. (i) Glycine (21 CFR 582.5049) is a product which contains a minimum of 97 percent amino acetic acid. The percentage of glycine must be guaranteed.
10. (j) L-Arginine (21 CFR 582.5145) is a product which contains a minimum of 98 percent L-2-amino-5-guanidyl-valeric acid. The percentage of L-Arginine must be guaranteed.
11. (k) L-Lysine (21 CFR 582.5411) is a product which contains a minimum of 95 percent L-2,6-diaminohexanoic acid. The percentage of L-lysine must be guaranteed.
12. (l) L-Lysine Liquid (21 CFR 582.5411) is a product that contains a minimum of 50 percent L-2, 6-diaminohexanoic acid by weight in a water solution. The L-lysine content must not be less than 85 percent on a moisture-free basis. The percentage of L-lysine must be guaranteed.
13. (m) L-Lysine Monohydrochloride is a product which contains a minimum of 95 percent L-2, 6-diaminohexanoic acid monohydrochloride. The percentage of L-lysine must be guaranteed.
14. (n) L-Methionine is a product containing a minimum of 98.5 percent L-isomer of 2-amino-4-(methylthio)butanoic acid. L-Methionine is produced by Escherichia coli K12 fermentation followed by enzymatic conversion to L-methionine. The percentage of L-methionine must be guaranteed.
15. (o) L-Threonine (21 CFR 582.5881) is a product which contains a minimum of 95 percent L-2-amino-3-hydroxybutanoic acid. The percentage of L-threonine must be guaranteed.
16. (p) L-Tryptophan (21 CFR 582.5915) is a product which contains a minimum of 97 percent L-2-amino-3-(3′indolyl)-propionic acid. The percentage of L-tryptophan must be guaranteed. Excessive tryptophan consumption in cattle (in excess of 0.17 grams tryptophan per 100 pounds bodyweight per day) is associated with bovine pulmonary emphysema.
17. (q) L-Tyrosine (21 CFR 582.5920) is a product which contains a minimum of 98 percent L-2-amino-3-(4-hydroxyphenyl) propionic acid. The percentage of L-Tyrosine must be guaranteed.
18. (r) Taurine (21 CFR 573.980) is a product that contains a minimum of 97 percent 2-aminoethanesulfonic acid. The percentage of taurine must be guaranteed. It is used as a nutritional supplement in fish foods. Taurine may also be added to the feed of growing chickens; when added to complete chicken feed, the total taurine content shall not exceed 0.054 percent of the feed.

Note: Authority cited: Sections 407 and 14902, Food and Agricultural Code. Reference: Sections 14992 and 15011, Food and Agricultural Code.

History

1. Editorial correction of Note filed 8-17-82 (Register 82, No. 34).

2. Repealer and new section heading and section filed 11-12-2024 as an emergency; operative 11-12-2024 (Register 2024, No. 46). A Certificate of Compliance must be transmitted to OAL by 5-12-2025 or emergency language will be repealed by operation of law on the following day.

3. Repealer and new section heading and section refiled 5-12-2025 as an emergency; operative 5-12-2025 (Register 2025, No. 20). A Certificate of Compliance must be transmitted to OAL by 8-6-2025 or emergency language will be repealed by operation of law on the following day.

4. Certificate of Compliance as to 5-12-2025 order transmitted to OAL 6-10-2025 and filed 7-1-2025 (Register 2025, No. 27).