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The appropiate amino acid ratio of Lysine (Lys), Methionine (Met), and Threonine (Thr) based on the nitrogen retention (NR) of heifers aged seven to nine months old, fed corn–soybean meal-based TMRs.
| Items 1 | S | P | C | R |
|---|---|---|---|---|
| Lys | 0.61 | 1.00 | 69.99 | 100.00 |
| Met | 0.57 | 0.98 | 22.36 | 31.95 |
| Thr | 0.26 | 0.79 | 39.78 | 56.84 |
1 S(Slop) = (1-NR)/(1-AAI); P(proportion) = [(1-NR) + S × AAI]/S; C (concentration) = AAI × P; R (ratio) = AA/Lys.
