Com o objetivo de avaliar a eficácia de um fitoterápico e de um antibiótico usados de maneira isolada ou associada no desempenho de frangos de corte entre 1 e 42 dias de idade, foi conduzido um experimento com 320 pintos de corte de um dia de idade, machos, da linhagem COBB 500. As aves foram distribuídas em quatro tratamentos assim constituídos: T1= Avilamicina + Aviance (50/50%); T2= Avilamicina (100%); T3= Aviance (100%) e T4= sem promotor. O delineamento experimental foi inteiramente casualizado, com quatro tratamentos de quatro repetições com 20 aves cada. As variáveis de consumo alimentar, peso corporal e conversão alimentar foram avaliadas ao final de cada fase experimental; mortalidade e IEP foram avaliados no período total. O consumo de ração, o peso corporal e a conversão alimentar não foram afetados pelos diferentes promotores estudados. Porém, houve maior índice de mortalidade das aves que não receberam nenhum promotor de crescimento, o que causou o baixo índice de eficiência produtiva do tratamento-testemunha em relação aos demais.

The purpose of the present study was to compare the heart rate (HR), blood lactate and training load between different CrossFit® workouts, with equalized total work volumes in men and women. The study included 23 individuals (13 men and 10 women) experienced in CrossFit® training, who performed two workouts with different training types (as many reps as possible (AMRAP) and ‘for time’) but an equalized volume. Measurements of lactate, HR and rating of perceived exertion (RPE) were performed. The results show that there was no HR interaction between workout time and sex (p = 0.822; η2 = 0.006) and between workout type and sex (p = 0.064, η2 = 0.803). The HR significantly differed during each workout type (p < 0.001, η2 = 0.621), but not between the two workout types (p = 0.552, η2 = 0.017). Lactate showed no difference between the workout types (p = 0.474, η2 = 0.768), although the training load was higher (p = 0.033, η2 = 0.199) in women when they performed AMRAP. Altogether, the HR was not significantly different between training types or sex, while RPE, lactate and training load showed statistically significant differences depending on the group (women or men) or workout type (AMRAP or ‘for time’).

In this study, the influence of temperature variation on the blood and oxidative stress parameters of pacu Piaractus mesopotamicus juveniles was evaluated. Fish were subjected to gradual changes of temperature, over 5 days, by 24°C until reaching to experimental temperatures 18, 21, 24 (control), 27 and 30°C. There were significant differences (p < .05) in glucose and lactate of blood in both the haematological relationships and oxidative stress parameters. Glucose levels increased at 30°C and decreased at 21°C. Lactate levels were highest at 18°C. While the haematocrit was higher at all altered temperatures, haemoglobin levels decreased at 21°C and increased at 30°C, causing alterations in haematimetric indices. In the liver, glutathione‐S‐transferase (GST) activity was reduced at 18°C while antioxidant capacity against peroxyl radicals (ACAP) was highest at 30°C. Thiobarbituric acid reactive substances (TBARS) increased at 18, 21 and 27°C. In the muscle, ACAP decreased at 27 and 30°C and TBARS increased at 30°C. The results indicate that the species shows sensitivity to temperature variations. Accordingly, we conclude that with short‐term temperature variations >3°C, it is possible to induce higher alterations in the observed parameters in pacu juveniles.

Pacu (Piaractus mesopotamicus) lives in tropical and subtropical regions of South America, mainly in the Plata Basin and the Pantanal. Pacu can survive under conditions of low dissolved oxygen (DO), being considered a hypoxia-tolerant fish (Rocha-Santos et al., 2018). In Pantanal ecosystems, pacu migrates to smaller streams, channels and floodplains during the flood season. After the floods recede, many of them remain behind in shallow lakes and basins which can extend for miles, where the amount of DO may vary from hypoxia to normoxia (Cunha Bastos et al., 2007). In addition, the natural habitat encompasses a wide range of temperatures from 12 to 32°C

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