. 2019 Aug 22;10:76. doi: 10.1186/s40104-019-0373-2

Table 5.

Effect of dietary Met:Lys ratio in the lactation diet on the levels of methionine metabolites in the blood of sows

Items	Met:Lys				SEM	P-value
Items	0.27	0.37	0.47	0.57		Linear	Quadratic	Feed
No. of sows¹
At parturition
Methionine, μmol/L³	26.88	27.97	34.11	34.37	1.92	0.11	0.27	0.43
Homocysteine, μmol/L³	26.78	27.40	26.82	25.47	0.76	0.52	0.67	0.85
Cystine, μmol/L	10.70	9.51	10.47	7.92	0.60	0.36	0.18	0.39
Taurine, μmol/L³	52.2	46.1	55.7	50.0	2.0	0.89	0.87	0.85
Glutathione, μmol/L	74.58	76.77	77.77	79.34	1.52	0.75	0.27	0.55
At day 7
Methionine, μmol/L^2,3	21.96^C	39.57^B	49.63^B	63.84^A	2.75	0.00	0.00	0.00
Homocysteine, μmol/L^2,3	15.88^B	15.40^B	17.70^AB	19.76^A	0.47	0.00	0.00	0.00
Cystine, μmol/L²	6.58^ab	7.16^a	5.78^b	5.49^b	0.22	0.01	0.03	0.02
Taurine, μmol/L³	43.3	61.1	72.7	79.9	5.2	0.01	0.03	0.07
Glutathione, μmol/L	55.14	53.55	55.34	54.76	0.73	0.92	0.95	0.84
At weaning
Methionine, μmol/L^2,3	12.21^D	26.48^C	36.55^B	52.99^A	2.40	0.00	0.00	0.00
Homocysteine, μmol/L^2,3	13.88^B	14.55^B	15.40^B	18.96^A	0.48	0.00	0.00	0.00
Cystine, μmol/L²	3.90^ab	4.11^a	3.40^b	3.34^b	0.11	0.01	0.04	0.02
Taurine, μmol/L^2,3	23.3^B	36.6^B	30.4^B	64.7^A	3.8	0.00	0.00	0.00
Glutathione, μmol/L²	59.31^B	59.04^B	58.04^B	64.97^A	0.77	0.02	0.00	0.00

¹The number of samples of sows in each group was more than 9 but not equal; SEM, standard error of the mean

²Means in the same row with different letters differ significantly; the different lowercase letters represent P < 0.05, and the different capital letters represent P < 0.01

³There was a treatment × sampling day interaction for plasma methionine (P < 0.001), homocysteine (P < 0.05) and taurine (P < 0.05) concentrations