BMC Veterinary Research

Table 6 Methionine conversion to cystine and intermediates

From: Methionine to cystine ratio in the total sulfur amino acid requirements and sulfur amino acid metabolism using labelled amino acid approach for broilers

Met:Cys/TSAA ratio	¹⁵N_Rec^a	¹⁵N-Met_Rec^b	Met_{Cys + interm.}^c	AA_Rec _(Cys)^d	¹⁵N_Rec_(Cys)^e	Cys_Met^f	Met_interm.^g
Met:Cys/TSAA ratio	(%)
44:56	100 ± 3.89	49 ± 4.62	51 ± 2.83	93 ± 10.92	66 ± 2.94	27 ± 7.83	24 ± 8.60
50:50	100 ± 2.80	47 ± 4.62	53 ± 2.41	103 ± 10.52	72 ± 3.89	31 ± 4.31	22 ± 3.61
56:44	96 ± 2.76	42 ± 3.77	54 ± 1.71	111 ± 9.50	68 ± 7.73	43 ± 4.11	12 ± 6.31

^{a 15}N_Rec (Table 3) from Met
^{b 15}N-Met_Rec (Table 5) excluding excreta
^c Met_{Cys + interm} = ¹⁵N_{Rec (Met)} - (¹⁵N-Met_Rec)
^d AA_Rec (Table 4) of Cys
^{e 15}N_Rec (Table 3) from Cys, excluding excreta
^f Cys_Met = AA_{Rec (Cys)} - ¹⁵N_{Rec (Cys)}
^g Met_interm. = Met_{Cys + interm.} - Cys_Met

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