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This study aimed to evaluate and compare the physiological variables of three sheep genotypes: Morada Nova, Somalis, and Dorper x Somalis crossbreed regarding the environment and diet in the Brazilian semi-arid region by using 30 animals (10 from each genetic group). Five of these animals had 30% of the tifton hay replaced by hairy woodrose hay. The temperature and relative air humidity were registered, the black globe temperature and humidity index (BGHI) was calculated, and the rectal temperature (RT), respiratory rate (RR), heart rate (HR), and surface temperature (ST) were measured in the morning and afternoon. The experimental design was a completely randomized design in a 3 × 2 × 2 factorial scheme, which consisted of three genotypes, two diets, and two periods, and five replications each. BGHI presented values of 81 in the shade and 90 in the sun and a significant difference (P < 0.05) was observed for the studied variables in relation to the periods, with higher values in the afternoon. The average ST was 35.48 °C in the morning and 38.11 °C in the afternoon. Morada Nova presented the lowest RT and RR (P < 0.05) among the genetic groups, with a higher tolerance to heat. The 30% substitution of tifton hay by hairy woodrose hay did not negatively affect the thermoregulatory capacity of sheep. The studied genetic groups were adapted and tolerant to climate conditions of the Brazilian semi-arid region.

Regiões áridas-Brasil. I. Zuffo, Alan Mario. II. Série. CDD 333.7369 Elaborado por Maurício Amormino Júnior-CRB6/2422 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. 2019 Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. www.atenaeditora.com.br APRESENTAÇÃO A obra "As Regiões Semiáridas e suas Especificidades" aborda uma série de livros de publicação da Atena Editora, em seu III volume, apresenta, em seus 23 capítulos, com conhecimentos tecnológicos das regiões semiáridas e suas especificidades. As Ciências estão globalizadas, englobam, atualmente, diversos campos em termos de pesquisas tecnológicas. O semiárido brasileiro tem característica peculiares, alimentares, culturais, edafoclimáticas, étnicos, entre outros. Tais, diversidades culminam no avanço tecnológico, nas áreas de Agronomia, Engenharia Florestal,

In the Brazilian semi-arid region, small ruminants reared in the field, especially in the dry period of the year, may be subjected to thermal stress, which can compromise their homeothermy. This study aimed to evaluate the climatic indices, rectal temperature (TR), surface temperature (TS), thermal gradient between rectal and surface temperatures and the ambient temperature of Santa Inês sheep and Moxotó goats, reared in the Brazilian semi-arid region in two periods of the year (less hot and hot) and at three times (13, 14 and 15 h), using 24 animals, 12 of each breed, 6 males and 6 females of each species, grouped in a completely randomized design in a 2 x 2 x 2 factorial scheme (species, genders and periods), with 6 replicates. Ambient temperature and black globe temperature and humidity index in the periods and times were above ideal for the species, with low relative humidity. In both periods, the means of TR remained within the normality standard for the species, but higher in sheep. TS remained high for the two species and higher in sheep at the times evaluated. The thermal gradients were below ideal, indicating damage to the physiological capacity of the animals to maintain homeothermy in the environment in which they were.

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