Effects of different load weights on the work performance and physiological and hematobiochemical responses in...

Working animals are important in agriculture because they play a role in various agricultural activities, including milk and meat production. Thus, they contribute to the development of rural communities. In this study, we aimed to evaluate the effects of different load weights on the work performance and the physiological and hematological responses of working water buffalo (Bubalus bubalis).

The work performances of 12 buffaloes (average weight 782.16 ± 21.62 kg) transporting 200, 350, and 500 kg of African palm fruits in metal baskets placed on their backs were evaluated. Work performance variables evaluated immediately after work were as follows: total number of trips (n), total weight (kg), distance traveled (km/day), working period (h), stopped time (h), and average speed (km/h). In addition, we evaluated physiological, biochemical, and hematological variables at three different times: before the start of work, immediately after work, and on the rest day.

Among the load weights, 500 kg (total load carried = 4,138.88 kg) improved work efficiency compared to 200 kg loads (total load = 3,322.22 kg) (p = 0.0281). However, 500 kg loads resulted in slower average speed (2.4 km, p = 0.0164), shorter working period (2.39 h, p < 0.0001) and distance traveled (7.29 km, p < 0.0001), and less total number of trips (8.27 trips, p < 0.0001) compared to 350 and 200 kg load weights (3.45 and 3.52 km/h, 2.55 and 2.79 h, 8.71 and 9.75 km, 10.94 and 16.61 trips, respectively); and the heaviest loads resulted in significantly higher (p < 0.005) respiratory rate, pulse, heart rate, rectal temperature, glucose, lactate dehydrogenase, creatine kinase, total protein, white blood cell count, neutrophils, lymphocytes, monocytes, eosinophils, and basophils. In contrast, was associated with lower levels of red blood cells, hemoglobin, and hematocrit compared to lower loads. All differences were more pronounced in 500 kg (p < 0.005) compared to 200 kg loads.

Working buffaloes responded to work related to the transport of African palm fruits through various physiological, biochemical, and hematological changes. However, some variables remained close to the reference values reported in the literature for water buffaloes, and in general, all variables were reestablished during the rest day, indicating that these animals have adapted to working conditions.