CHANGES IN PHYSIOLOGICAL RESPONSES OF LAMBS F1 (PELIBUEY X KATAHDIN AND PELIBUEY X DORPER) UNDER HEAT STRESS

Authors

Keywords:

Animal welfare, crossbreeding F1, temperature, thermoregulation, tropical climate.

Abstract

The aim of this study was to evaluate the degree of heat stress of F1 Pelibuey x Dorper (PD) and Pelibuey x Katahdin (PK) lambs under humid tropical climate conditions, specifically in La Hacienda Nápoles, San Vicente, Panamá provincial. Twenty males were used, 10 for each F1 cross. The animals were managed under confinement conditions. The climatic and physiological variables were studied at seven times (6:00, 8:00, 10:00 a.m., 12:00, 2:00, 4:00 and 6:00 p.m.) every seven days for four consecutive months from March to June of 2022. According to the results, the temperature and humidity index (ITH) increased ≥ 79 units during noon and afternoon. The F1 cross did not affect (P>0.05) respiratory rate (RR), heart rate (HR), rectal temperature TR and surface temperature ST. The time of day showed an effect (P<0.05) on the physiological responses in both F1 crosses. During noon and afternoon the animals presented higher RF with 85.97 (resp/min), FC 97.47 (beats/min) and TR 39.78° C compared to morning hours. The TS presented an average of 36.94° C in the PD lambs and 34.97° C in the PK lambs. The week and the month did not show effects (P>0.05) on the variables FR, FC, TR and TS. In conclusion, F1 PD and PK lambs, regardless of week and month, are susceptible to moderate and high heat stress when the ITH is ≥ 79 units. It is suggested to measure the ITH in lamb feedlots and monitor FR, FC, TR and TS to determine heat stress and improve animal welfare.

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References

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2024-01-05

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CHANGES IN PHYSIOLOGICAL RESPONSES OF LAMBS F1 (PELIBUEY X KATAHDIN AND PELIBUEY X DORPER) UNDER HEAT STRESS. (2024). Ciencia Agropecuaria, 38, 56-83. https://idiap.desarrollo-ojs1.metadatos.org/index.php/ciencia-agropecuaria/article/view/627