Frequência cardíaca, lactacidemia e gasto energético de equinos da raça crioula em provas credenciadoras ao Freio de Ouro

Abstract

The Freio de Ouro award is a horse competition for horses of the Criollo breed. This is a conformation-functional competition, which evaluates the breed characteristics according to breed standard and performance in ranch work. The Brazilian Association of Criollo Breeders (ABCCC) has promoted this competition for over 25 years. The aim of this study was to investigate and determine the parameters of heart rate, speed, lactate concentration and energetic expenditure of the Criollo-type horses during the Freio de Ouro competition. The parameters of heart rate (HR), speed, blood lactate concentration and energy expenditure during the functional step of the competition were evaluated. In the functional steps And/Fig/VSP (203bpm) and Mangueira I (201 bpm) the HR was statistically different than in the other steps of the competition (Mangueira II (198,8 bpm), Paleteada I (189,4 bpm), Bayard-Sarmento (185,5 bpm) and Paleteada II (185 bpm)). The highest speed obtained during the competition was recorded in the step of Paleteada I and Paleteada II (34,0 km/h; 39,7 km/h), which was distinct from the other steps performed within the competition (And/fig/VSP 19,0 km/h; Mangueira II 10,1 km/h and Mangueira I, 8,5 km/h) (P<0,05). The blood lactate concentration was high in all steps of competition, being the highest value in the Paleteada II and I steps (13,1 and 14,5 mmol/L) (P<0,05). Although the blood lactate concentrations had lower variation in the steps of Mangueira I and Mangueira II (9,3 mmol/L; 10,4 mmol/L), in the steps And/fig/VSP (12,5 mmol/L) and Bayard-Sarmento (11,8 mmol/L) (P>0,05) the concentrations were similar. The highest energy expenditure was in the And/fig/VSP step (853,28 Kcal/KgBW/min). The steps performed with the presence of cattle did not differ among themselves (P>0,05), Mangueira I and II (388,41;411,94 Kcal/KgBW/min), Paleteada I and II (319,33; 382,11 Kcal/KgBW/min) and Bayard-Sarmento (223,29 Kcal/KgBW/min). In this study, the Bayard-Sarmento was the step of lower energy expenditure within the competition. All functional steps of competition can be classified as anaerobic and exhaustive because all horses present high energy expenditure and lactate concentrations. The steps And/fig/VSP, Mangueira I and II need greater attention during this competition because they require a higher energy expenditure of the horses, In addition the Paleteada I and II steps can cause fatigue and muscle acidemia in untrained horses as they result in a higher concentration of blood lactate.