Growth performance, metabolic variables, and meat quality were measured in 78 growing-finishing pigs using supplements of 0 (C), or 0.2% of DL-methionine (M), and three combinations of folic acid [mg/kg] and cyanocobalamin [μg/kg], respectively 0 and 0 (V0), 10 and 25 (V1), and 10 and 150 (V2) in a 2 × 3 factorial arrangement. Feed conversion was lower (p = 0.05) in M than in C pigs during the growing period (0–4 weeks). Both V1 and V2 treatments increased plasma vitamin B12 (p < 0.01) and decreased plasma homocysteine (p < 0.01). Plasma 5-methyl-tetrahydrofolates were the lowest, highest and intermediate in V0, V1 and V2 pigs (p < 0.04), respectively. In V2 meat, folates were 32% higher, vitamin B12, 55% higher and homocysteine, 28% lower than in V0 (p < 0.01). Oxidative stability of the fresh meat was similar among treatments during a storage period of 42 days. Therefore, methionine supplements improved growth performance during the growing period. Vitamin supplements interacted with the methionine cycle pathway, increased vitamin content of pork meat but did not improve oxidative stability of the fresh meat during storage.

中文翻译：

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生长育肥猪的蛋氨酸、叶酸和维生素 B12：对生长性能和肉质的影响

使用 0 (C) 或 0.2% DL-蛋氨酸 (M) 以及三种叶酸 [mg/kg] 和氰钴胺素的补充剂，对 78 头生长育肥猪的生长性能、代谢变量和肉质进行了测量。 μg/kg]，分别为 0 和 0 (V0)、10 和 25 (V1) 以及 10 和 150 (V2)，以 2 × 3 阶乘排列。在生长期（0-4 周），M 猪的饲料转化率低于 C 猪（p = 0.05）。V1 和 V2 处理均增加血浆维生素 B12（p < 0.01）并降低血浆同型半胱氨酸（p < 0.01）。血浆 5-甲基四氢叶酸在 V0、V1 和 V2 猪中分别是最低、最高和中间的（p < 0.04）。在 V2 肉中，叶酸比 V0 高 32%，维生素 B12 高 55%，同型半胱氨酸比 V0 低 28%（p < 0.01）。在 42 天的储存期内，新鲜肉的氧化稳定性在不同处理中相似。因此，蛋氨酸补充剂可改善生长期的生长性能。维生素补充剂与蛋氨酸循环途径相互作用，增加了猪肉的维生素含量，但没有提高鲜肉在储存过程中的氧化稳定性。