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Revista Brasileira de Engenharia Agrícola e Ambiental

versão impressa ISSN 1415-4366versão On-line ISSN 1807-1929


SILVA, Gustavo de A. et al. Effect of year time and period of day on physiological parameters of reproductive goats in the semi-arid Paraiba. Rev. bras. eng. agríc. ambient. [online]. 2006, vol.10, n.4, pp.903-909. ISSN 1807-1929.

The objective of this work was to verify the effect of time of year and period of day on physiological parameters of reproductive Anglo-Nubiana crossbred goats with goats without a defined racial pattern race, in the semi-arid Paraiba. 20 male goats were used, allocated into a completely randomized design in a 2 x 2 factorial scheme, two periods: E1, May to August, and E2, September to December, and two periods, morning and afternoon, repeated in time, totaling 80 plots. For the hematological parameters only the effect of time of year was studied. The physiological parameters, rectal temperature and respiratory frequency were influenced (P < 0.01) by the period, while the surface temperature (ST) suffered influence (P < 0.01) of both factors, day period and time of year. The parameters hematological, erythrocyte (HE), hematocrit (HT) and medium globular volume (MGV) were influenced (P < 0.05) by the time of the year. The little variation of the physiological parameters of Anglo-Nubiana crossbred goats without defined racial patlern demonstrates a high adaptation degree to high temperatures. During the period of higher temperature, the heat loss in the form of evaporation and respiration determines the elevation of the hematócrit and medium globular volume.

Palavras-chave : animal environment; rectal temperature; respiratory frequency; animal bioclimatology.

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