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首页> 外文期刊>African Journal of Biotechnology >Dynamics of the concentration of the hormones triiodothyronine and thyroxine at the beginning of the reproductive season and the effect of application of iodine in Nelore heifers bred in pasture
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Dynamics of the concentration of the hormones triiodothyronine and thyroxine at the beginning of the reproductive season and the effect of application of iodine in Nelore heifers bred in pasture

机译：繁殖季节开始时三碘甲状腺素和甲状腺素激素浓度的变化以及碘对牧场饲养的耐罗瑞小母牛施用的影响

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摘要

The aim of this study was to evaluate the dynamics of triiodothyronine (T3) and thyroxine (T4) hormones, their relation with body condition score (BCS) and reproductive stage of 248 Nelore heifers, and the effect of iodine application on the induction of cyclicity of 217 anoestrus heifers in pasture at the beginning of the reproductive season. At day zero (D0), an assessment of the BCS was performed. An examination of ovarian structures was performed by ultrasound (US) and the serum was collected for hormonal analysis. Anestrous animals received 27 mg of iodine or placebo (saline). After 40 days (D40), another US was performed, and BCS and hormonal determination evaluations were repeated. At D0 and D40, the cycling group had a BCS mean and a T3 concentration higher than the anestrous group. BCS and T3 and T4 concentrations influenced cyclicity and probability of pregnancy. The treatment did not affect cyclicity, pregnancy rate and number of days between the treatment and calving.
机译：这项研究的目的是评估三碘甲状腺素（T3）和甲状腺素（T4）激素的动力学，它们与248个Nelore母牛的身体状况评分（BCS）和生殖阶段的关系，以及碘对周期性诱导的影响。繁殖季节开始时，牧场中有217头厌食小母牛。在第0天（D0），对BCS进行了评估。通过超声（US）检查卵巢结构，并收集血清用于激素分析。发情动物接受27毫克碘或安慰剂（盐水）。 40天（D40）后，再次进行US检查，并重复进行BCS和激素测定评估。在D0和D40，骑车组的BCS平均值和T3浓度高于发情组。 BCS和T3和T4浓度会影响周期性和怀孕机率。治疗不影响周期，妊娠率和治疗与产犊之间的天数。

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