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首页> 外文期刊>Animal Science Journal >Effect of iodine, selenium and cobalt rumen boluses given to dry dairy cows on the immunoglobulin and thyroid hormone status of calves.
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Effect of iodine, selenium and cobalt rumen boluses given to dry dairy cows on the immunoglobulin and thyroid hormone status of calves.

机译：给干奶牛喂碘，硒和钴瘤胃丸对小牛免疫球蛋白和甲状腺激素状态的影响。

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摘要

The objective was to determine the effect of rumen boluses containing 6800 mg iodine, 1000 mg selenium and 1000 mg cobalt given to dry dairy cows on the efficiency of colostral immunoglobulin G (IgG) absorption in calves. Thirteen cows received the bolus approximately 58 days before calving. A further 12 cows received no bolus and were used as controls. The cows were housed as one group. Calves were prevented from suckling for the first 24 h of life, and were given three feeds of a fixed quantity of colostrum. At 24 h, the average plasma concentrations of IgG in the calves were 15.5 and 13.4 g/L for the control and bolus groups, respectively; these were not significantly different (P=0.212). Bolus treatment was associated with higher levels of free and total tri-iodothyronine (T3) and thyroxine (T4) in the dams (all P<0.001), although it had no effect on thyroid hormone levels in the calves. There were nevertheless positive and negative relationships between the efficiency with which colostral IgG was absorbed at 24 h and, respectively, total T3 at 24 h (P<0.05) and total T4 at 1 h of age (P<0.05). The underlying basis for these relationships remains to be established.
机译：目的是确定给予干奶牛的瘤胃大剂量含6800 mg碘，1000 mg硒和1000 mg钴对犊牛体内初乳免疫球蛋白G（IgG）吸收效率的影响。在产犊前约58天，有13头牛接受了推注。另外12头母牛不接受推注，并用作对照。牛被作为一组饲养。犊牛在出生后的头24小时内被禁止哺乳，并给它们喂了三批固定量的初乳。在24 h，对照组和推注组的小牛平均IgG血浆浓度分别为15.5和13.4 g / L。这些没有显着差异（ P = 0.212）。 lu处理与大坝中游离和总三碘甲状腺素（T3）和甲状腺素（T4）的水平较高有关（所有 P <0.001），尽管它对水坝中的甲状腺激素水平没有影响。小牛。但是，初乳在24 h的吸收效率与24 h的总T3（ P <0.05）和1 h年龄的总T4（< i> P <0.05）。这些关系的基础仍待建立。

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