Short duration heatwaves increase body temperature and alter blood gas balance but may not cause oxidative stress and intestinal structure variations in lambs

IF 1.6 3区农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Small Ruminant Research Pub Date : 2024-09-21 DOI:10.1016/j.smallrumres.2024.107367

Minghao Zhang , Frank R. Dunshea , Robyn D. Warner , Kristy DiGiacomo , Aleena Joy , Archana Abhijith , Pragna Prathap , Ting Ma , Surinder S. Chauhan

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Abstract

This study investigated the impact of short duration heatwaves (HW) on the body temperature, blood gas, intestinal histology, and oxidative stress parameters of second cross lambs. Seventy-two second cross lambs [Poll Dorset × (Border Leicester × Merino)] were selected and exposed to either one, three or five days HW (28–38°C and 40–60 % relative humidity (RH)) or thermoneutral (TN; 18–21°C, 40–55 % RH) conditions in climate-controlled chambers. Lambs exposed to one to five days HW exhibited higher face, eye and ear temperature compared to animals exposed to equal duration under TN conditions. HW also had a significant impact on blood gas parameters which include higher blood pH, and lower CO₂, Ca²⁺, Na⁺, CHCO₃^- and Cl^-. However, HW lambs’ histology structure of the ileum and the GSSG: GSH of the ileum and Longissimus thoracis (LT) muscle were not influenced (P > 0.05) by HW. LT muscle showed higher total antioxidant capacity (TAC) in HW conditions, but the TAC of intestine and blood had no difference between HW and TN groups. These results suggest that short-duration HW (one to five days) had a significant impact on lambs’ body temperature and blood parameters, but neither caused oxidative stress nor any changes in their intestinal structure.

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短时热浪会提高体温并改变血气平衡，但可能不会导致羔羊氧化应激和肠道结构变化

本研究调查了短时热浪（HW）对二胎杂交羔羊体温、血气、肠道组织学和氧化应激参数的影响。研究人员挑选了72只次交羔羊[Poll Dorset × (Border Leicester × Merino)]，并在气候控制室中将其暴露于为期一、三或五天的热浪（28-38°C，40-60 % 相对湿度（RH））或热中性（TN；18-21°C，40-55 % 相对湿度）条件下。与在 TN 条件下暴露相同时间的动物相比，暴露 1 到 5 天 HW 的羔羊脸部、眼睛和耳朵温度更高。高湿对血气参数也有显著影响，包括血液 pH 值升高，CO2、Ca2+、Na+、CHCO3- 和 Cl- 降低。然而，回肠组织学结构以及回肠和胸长肌（LT）肌肉的 GSSG: GSH 均不受 HW 影响（P > 0.05）。在 HW 条件下，LT 肌肉的总抗氧化能力（TAC）较高，但肠道和血液的总抗氧化能力在 HW 组和 TN 组之间没有差异。这些结果表明，短期HW（1至5天）对羔羊的体温和血液参数有显著影响，但既不会引起氧化应激，也不会改变羔羊的肠道结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Small Ruminant Research 农林科学-奶制品与动物科学

CiteScore

3.10

自引率

11.10%

发文量

210

审稿时长

12.5 weeks

期刊介绍： Small Ruminant Research publishes original, basic and applied research articles, technical notes, and review articles on research relating to goats, sheep, deer, the New World camelids llama, alpaca, vicuna and guanaco, and the Old World camels. Topics covered include nutrition, physiology, anatomy, genetics, microbiology, ethology, product technology, socio-economics, management, sustainability and environment, veterinary medicine and husbandry engineering.