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Effects of road transportation or droving on the weight and metabolism of young bulls

机译：公路运输或开车对幼小公牛体重和代谢的影响

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This study evaluated the effects of the mode of transportation on weight and metabolism of young bulls, which are generally transported by two systems: droving and truck. This experiment consisted of two phases: transportation and refeeding and involved transportation by droving and truck. Fifty young Nellore bulls were separated in equal numbers in both groups, droving group and truck group. In the transportation phase, animals were moved, in a 640-km journey. The refeeding phase consisted of 84 days and commenced after the animals arrived at the fattening farm. The effect of the transportation system on animals' weight, metabolic hormones, and serum biochemistry was assessed after 28, 56, and 84 days. During the transportation phase, animals in the droving group lost 10.11 kg and animals in the truck group gained 13.1 kg. The truck group showed 20.5 kg of weight gain at the end of the refeeding phase. The highest triiodothyronine (T-3) and thyroxine (T-4) concentrations were observed on days 0 and 60 in the transportation phase in both droving and truck groups. The serum cortisol concentration was higher in the droving group than in the truck group on day 56 of the refeeding phase. The IGF-I concentrations were higher during the refeeding phase in the droving group than in the truck group. Our results showed that transportation by droving leads to increased weight loss and reduced further weight gain compared to transportation by truck and that serum concentrations of T-4, cortisol, and insulin-like growth factor (IGF-I) hormones are altered by the transportation system.
机译：这项研究评估了运输方式对年轻公牛体重和代谢的影响，这些公牛通常通过两种系统进行运输：驾车和卡车。该实验包括两个阶段：运输和补给，以及通过开车和卡车运输。在驾驶组和卡车组中，五十只年轻的内洛尔公牛被分成两组。在运输阶段，以640公里的路程移动了动物。重新喂养阶段为期84天，从动物到达育肥场开始。在28、56和84天后评估运输系统对动物体重，代谢激素和血清生化的影响。在运输阶段，驾车组的动物减少了10.11公斤，卡车组的动物增加了13.1公斤。在补料阶段结束时，卡车组的体重增加了20.5 kg。在驾驶组和卡车组的运输阶段的第0天和第60天观察到最高的三碘甲状腺素（T-3）和甲状腺素（T-4）浓度。在进食阶段的第56天，行车组的血清皮质醇浓度高于卡车组。在进食阶段，在驾车组中，IGF-I的浓度高于卡车组。我们的结果表明，与卡车运输相比，驾车运输导致体重减轻并进一步减轻体重增加，并且运输会改变T-4，皮质醇和胰岛素样生长因子（IGF-1）激素的血清浓度系统。

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