O Objetivo foi determinar a ocorrência de hematomas em carcaças de bovinos transportados por duas distâncias e abatidos no norte do estado do Mato Grosso. Foram avaliados 624 bovinos machos de 30 a 36 meses oriundos de distâncias variadas até o frigorífico, sendo 352 animais oriundos de distâncias menores que 200km e 272 animais transportados por mais de 200km. Para avaliação dos hematomas nas carcaças, seguiu-se o critério descrito pela AUS-MEAT (2005), sendo as lesões classificadas de acordo com a sua localização na carcaça (traseiro, dianteiro ou costado). A relação de hematomas por grupo aumentou com a maior distância de transporte, sendo 43,75% e 95.58% de animais com hematomas para distâncias menores e maiores que 200km, respectivamente. Quando analisada a região do hematoma, verificou-se 7,6 e 17,6 observações na região do dianteiro (P= 0,035) e 30,6 e 101,0 observações na região do traseiro (P=0,009) para distâncias menores e maiores que 200km, respectivamente. Portanto, a distância do transporte de bovinos até o abate teve influência sobre a quantidade de hematomas apresentados, principalmente na região do traseiro.

The objective of the present review is to provide an overview on the effects of the addition of dietary chromium. The complex of chelated minerals that are molecular structures less toxic and more bioavailable, and grants a supplementation with high margin of safety for both animal and consumer of meat and milk. Functions are attributed to chromium that include mainly the carbohydrate metabolism, but also to a lesser extent the protein and lipid metabolism and in cases of stress causes decrease serum cortisol concentration. The chromium was characterized as participant component of the amplification mechanism of the insulin cellular signaling, ie. contributing factor of the sensitivity increase of insulin receptors on the plasma membrane. The chromium and thyroid hormones influenced production and actions of growth hormone (GH) mediated by IGF-1. In cardiac and skeletal muscle, IGF-1 stimulates the uptake and transportation of glucose, as well as the lactate production. From anabolic point of view, IGF-1 stimulates the synthesis of RNA and protein. However, growth responses were inconsistent among different sources and varying inclusion rates of chromium. Information on the dietary chromium mode of action is quite limited, and large variations exist in results regarding the effects. Further research is required to clarify the chromium mode of action and its association with subsequent growth performance in animals.

The objective was to evaluate the productive performance and the carcass traits of Nellore (NEL) and Rubia Gallega x Nellore F1 (NRG) heifers, subjected to energy-protein supplementation with chromium picolinate (CrP). Sixty heifers (30 NEL and 30 NRG) with a mean initial adjusted body weight (BW) of 214.50 kg and mean age of 201 days were distributed into a completely randomized design, in a 2 x 2 factorial (2 genetic groups x 2 supplementation groups). The experimental period lasted 320 days. There was no interaction (p>0.05) between the genetic groups and the supplements. The addition of CrP to the supplement did not alter the performance and carcass characteristics evaluated (p>0.05). However, the NRG genetic group was better than the NEL in the performance characteristics as final live weight, mean daily gain and carcass yield as carcass yield, Muscularity (p≤0.05).The use of the Rubia Gallega genotype in crossbreeding provides an increase in production of heavier carcasses with lower fat percentages and higher yields when compared to the use of Nellore heifers.