Different dietary methionine to lysine ratios in the lactation diet: effects on the performance of sows and their offspring and methionine metabolism in lactating sows

Table 6 Effect of dietary Met:Lys ratio in the lactation diet on the levels of methionine metabolites in the colostrum and milk of sows

Items	Met:Lys				SEM	P-value
Items	0.27	0.37	0.47	0.57	SEM	Linear	Quadratic	Feed
No. of sows¹
Colostrum
Methionine, μmol/L	3.28	4.69	3.48	3.20	0.42	0.71	0.64	0.62
Homocysteine, μmol/L	25.66	25.18	38.99	35.29	2.93	0.10	0.26	0.46
Cystine, μmol/L	0.68	0.76	0.86	0.40	0.09	0.35	0.17	0.26
Taurine, μmol/L³	575.7	501.7	552.8	552.4	34.7	0.95	0.90	0.92
Glutathione, μmol/L	53.06	52.72	51.88	50.23	0.58	0.07	0.16	0.31
Milk at day 7
Methionine, μmol/L	14.18	16.30	16.13	18.56	0.74	0.05	0.15	0.23
Homocysteine, μmol/L	30.39	38.19	30.62	32.99	2.33	0.96	0.90	0.66
Cystine, μmol/L	2.11	2.39	2.62	2.24	0.14	0.67	0.77	0.64
Taurine, μmol/L³	780.4	944.7	851.9	790.4	24.7	0.70	0.08	0.07
Glutathione, μmol/L	45.63	47.36	47.41	50.16	0.58	0.01	0.03	0.04
Milk at day 20
Methionine, μmol/L	18.41	18.48	16.77	16.49	0.93	0.38	0.68	0.82
Homocysteine, μmol/L²	9.58^B	20.46^A	25.01^A	29.38^A	2.08	0.00	0.00	0.00
Cystine, μmol/L	2.01	3.39	3.40	2.82	0.21	0.20	0.02	0.05
Taurine, μmol/L^2,3	801.0^b	965.3^a	927.9^ab	1068.4^a	29.4	0.01	0.02	0.02
Glutathione, μmol/L	50.19	50.27	52.29	51.69	0.73	0.32	0.59	0.68

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 trend for the level of taurine in milk (P = 0.074)

ISSN: 2049-1891