The present study aimed to evaluate the effect of applying different concentrations of niacin, at different times in relation to nitrogen fertilization, on the characteristics of Urochloa brizantha. The treatments consisted of applying three concentrations of niacin (0, 100, and 200 mg L-1) and three different moments (two days before, together, and two days after nitrogen fertilization). It was found that there was variation in response, mainly concerning the moment of application of the vitamins, in which the joint and subsequent application of fertilization generally exceeded the application performed previously, and of both concentrations used (100 and 200 mg L-1), in relation to the control without vitamin application. In this way, the application of niacin at a concentration of 100 mg L-1, carried out jointly or after nitrogen fertilization, provides better conditions for developing and producing dry matter of Urochloa brizantha due to the presence of nitrogen.

The objective of this study is to evaluate the perception of education professionals, before and after the application of theoretical and practical training based on active methodologies, on safety and prevention against fire and evacuation in disaster situations. The research method adopted is an action research, as it involves diagnosis, planning, action and evaluation to identify the perception of fire protection education professionals. The population consists of 29 education professionals and 75 students, aged between 4 and 5 years, from a private school in the city of Itabira-MG. The structured questionnaire technique is used for teachers and employees, applied before the project to measure the interviewees 'prior knowledge and after the project, to evaluate the effectiveness of the applied training, the teachers' perception of their and children's learning and the need for the topic to be an issue that the school community should constantly address as an important issue in the school calendar schedule. The results indicate that it is necessary to adopt safety training in schools and to keep this training constant. It is concluded that if teachers and school staff undergo regular training they will be able to act consciously, with students, in an emergency. That it is important to use scientific methods so that a broad and effective learning occurs and it is necessary to adopt the theme in the syllabus of schools.

The objective was to evaluate the effect of stocking density on productive performance, carcass characteristics, productivity, bone development, and profitability of Ross 308 broilers. A completely randomized experimental design with four stocking densities (10, 12, 14, and 16 birds m-2) and four replicates, and the subplots the bone collection ages (7, 14, 21, 28, 35, and 42 days old). The variables analyzed were live weight at 21 and 42 days, weight gain, feed intake, and conversion in the accumulated periods from 1 to 21 and 1 to 42 days. Weights of carcasses, commercial cuts, edible viscera, abdominal fat, productivity, production efficiency index, viability, and profitability were evaluated. The length, thickness, weight, and Seedor index of long bones (tibiotarsus and femur) were also evaluated. The yield was higher for densities of 14 and 16 birds m-2. The thickness of the tibiotarsus was lower in the density of 12 birds m-2. The increase in the stocking density of 10 or 12 birds m-2, to 14 birds m-2 allows greater productivity per area, without compromising the productive performance, such as carcass characteristics and the animal's bone development, besides being the breeding density with the highest profitability, considering the welfare of Ross 308 broilers.

Objetivou-se avaliar o efeito da sexagem no desempenho, características de carcaça, desenvolvimento ósseo e lucratividade de frangos de corte Ross 308. Foram utilizados 600 pintinhos, com um dia de idade, criados por separação do sexo. O delineamento experimental utilizado foi o inteiramente casualizado, com três tratamentos que foram lotes separados por sexo (machos, fêmeas e mistos) e cinco repetições. Avaliou-se o peso vivo, ganho de peso, consumo de ração e conversão alimentar, o peso e rendimento de carcaça, cortes comerciais, miúdos comestíveis e da gordura abdominal. Para avaliação do desenvolvimento ósseo foram mensurados o comprimento, espessura, peso e índice de Seedor dos ossos longos (tíbia e fêmur). Fizeram-se análises de viabilidade criatória (VC), índice de eficiência produtiva (IEP) e lucratividade. O desempenho produtivo dos frangos criados em lotes de machos e mistos foram maiores a partir do período de 1 a 21 dias quando comparado ao desempenho produtivo de fêmeas. O lote de frangos mistos teve comprimento de fêmur superior aos de machos e fêmeas. O lote misto foi mais lucrativo do que o lote de machos e fêmeas. Frangos de cortes machos, da linhagem Ross 308® apresentaram melhores desempenho produtivo, características de carcaça e a maioria dos parâmetros relacionados ao desenvolvimento ósseo do que os lotes de mistos e os de fêmeas. Porém, lotes mistos apresentaram maior lucratividade do que os lotes de machos e fêmeas.