Locally adapted brazilian sheep: a model of adaptation to Semiarid region

Semina: Ciências Agrárias

Olivardo Facó¹  Dowglish Ferreira Chaves²  Luis Alberto Bermejo Asensio³  Wallace Sostene Tavares da Silva⁴  Jacinara Hody Gurgel Morais Leite⁴  Débora Andréa Evangelista Façanha⁵  Wirton Peixoto Costa⁵  Wilma Emanuela da Silva⁵ 

[1] Empresa Brasileira de Pesquisa Agropecuária;Faculdade Maurício de Nassau;Universidad de la Laguna;Universidade Federal Rural do Semiárido;Universidade Federal Rural do semiárido;

关键词: Adaptability;    Coat traits;    Genetic resources;    Natural conditions;    Thyroid hormones;    Serum biochemistry.;   

DOI  :  10.5433/1679-0359.2018v39n5p2261

来源: DOAJ

【 摘 要 】

Well adapted animals are characterized by maintain homeostasis under natural conditions. The present study aimed to evaluate physiological and morphological responses, as well as identify the relationship between these parameters in order to maintain homoeothermic status, in the dry and rainy season. Measurements were taken from 383 Morada Nova hair ewes, under dry and rainy season. The studied variables included rectal temperature (RT), respiratory rate (RR), coat thickness (CT), hair length (HL), hair diameter (HD) and hair density (D). Blood samples were collected for determining biochemical, erythrogam and hormone concentration. The evaluated blood parameters from the Morada Nova breed did not demonstrate any variation from the reference interval established for sheep, confirming its adaptability profile even under high radiation and air temperatures. Multivariate analyses were performed in order to determine relationship between morphological, biochemical, erythrocyte and hormonal traits in each season. Differences correlations were observed according to season of the year. In the dry season, the correlations were significant among RT, RR, Packed cell volume (PCV), thyroxine (T4), Glucose (GLU), CT, HL, Globulin (GLO) and Total Protein (TP), whereas in dry season the characteristics that showed greater correlation were Mean corpuscular volume (MCV), thyroid hormones, Creatinine, GLO, TP, PCV and GLU. In conclusion, Morada Nova ewes was able to maintain homeothermy, even in the most stressful environmental conditions. Their hematological, biochemical and hormonal profile were within the normal range for sheep, confirming the adaptability of this local breed to the Brazilian semiarid environment.

【 授权许可】

Unknown