甜菜碱促进猪生长的机理

９６ 头“杜长大”生长猪按饲养试验要求分成 ４ 组（每组 ３ 个重复），分别饲 以添加 ０、１ ０００、１ ５００、２ ０００ ｍ ｇ／ｋｇ甜菜碱的基础日粮，试验期 ６２ ｄ。结果表明，１ ０００ ｍ ｇ／ｋｇ 剂量组试验猪生长性能最佳，日增重较对照组提高了 １３２０％ （ Ｐ ＜ ００１）， 料重比降低了 ７９３％ （ Ｐ ＜ ００１）。该组猪血清 Ｇ Ｈ、 Ｉ Ｇ Ｆ Ｉ、 Ｔ３ 、 Ｔ４ 水平分别升高了 １０１７６％ （ Ｐ＜ ００１）， ４４７５％ （ Ｐ ＜ ００１）， ２６５３％ （ Ｐ＜ ００１） 和 １６８３％ （ Ｐ＜ ００５）； 血清游离丝氨酸含量提高了 １４２８％ （ Ｐ ＜ ００５）； 血清总蛋白上升了 ２１６９％ （ Ｐ ＜ ００１）， 血清尿素氮含量降低 了 ４７６７％ （ Ｐ ＜ ００１）； 背最 长肌 和 肝脏 中 Ｒ Ｎ Ａ 含量 及 背最 长肌 Ｒ Ｎ Ａ／ Ｄ Ｎ Ａ 比 率分 别升 高了１２６０％ （ Ｐ ＜ ００５）， １７８０％ （ Ｐ ＜ ００２） 和 １９７９％ （ Ｐ ＜ ００２）； 肝脏 和腺 垂体 ｃ Ａ Ｍ Ｐ 含 量提 高了４７５３％ （ Ｐ ＜ ００１） 和 ６５２１％ （ Ｐ ＜ ００１）。研究结果提示，甜菜碱似作用

Approach of the Mechanism of Growth promoting Effect of Betaine on Swine

A feeding trial using 96 crossbred growing pigs randomly assigned to four groups (each of which included three replicates) receiving the same basal diet supplemented with 0, 1 000, 1 500, 2 000 mg/kg betaine respectively for 62 d were conducted to study the effect of betaine on growth performances of the pigs and to approach the mechanism. The results of feeding trial showed that pigs supplemented with 1 000 mg/kg betaine grew fastest, whose ADG was increased by 13 20%(P<0 01), F/G was decreased by 7 93%(P<0 01), and data obtained from samples analysis of this group showed that levels of GH, IGF I, T 3, T 4 in serum were elevated by 101 76%(P<0 01),44 75%(P<0 01), 26 53%(P<0 01) and 16 83%(P<0 05)respectively; concentration of free Ser in serum was elevated by 14 28%(P<0 05);concentration of TP was increased by 21 69%(P<0 01),while SUN was decreased by 47 67%(P<0 01);content of RNA in LD and liver, and RNA/DNA ratio in LD were enhanced by 12 60%(P<0 05), 17 80%(P<0 02)and 19 79%(P<0 02) respectively; concentrations of cAMP in liver and anterior pituitary were increased obviously by 47 53%(P<0 01) and 65 21%(P<0 01). The results obtained from this reseach implicate that supplememtal betaine acts on endocrinic system of the pigs and promotes their growth by elevating the levels of GH, IGF I, T 3 and T 4 in serum.