中国畜牧兽医 ›› 2021, Vol. 48 ›› Issue (10): 3625-3634.doi: 10.16431/j.cnki.1671-7236.2021.10.013

• 动物营养与饲料科学 • 上一篇    下一篇

雷州山羊、努比亚羊及其杂交F1代在热应激环境下生理和血液生化指标的对比研究

童雄1, 闵力1, 孙浩1, 徐斌1, 丁迪云1, 李大刚1, 王刚1,2   

  1. 1. 广东省农业科学院动物科学研究所, 畜禽育种国家重点实验室, 广东省畜禽育种与营养研究重点实验室, 广州 510640;
    2. 广东省农业科学院动物卫生研究所, 岭南现代农业科学与技术广东省实验室茂名分中心, 广东省畜禽疫病防治研究重点实验室, 广州 510640
  • 收稿日期:2021-04-01 出版日期:2021-10-20 发布日期:2021-09-30
  • 通讯作者: 李大刚, 王刚 E-mail:609048302@qq.com;wgwg2004@aliyun.com
  • 作者简介:童雄(1986-),男,湖北孝感人,博士,助理研究员,研究方向:动物遗传育种,E-mail:tongxiong@gdaas.cn
  • 基金资助:
    广东省农业科学院院长基金项目(201809);广东省自然科学基金项目(2018A030313002);提升市县农业科技能力促进优势产业发展创新模式研究项目(TS-1-6-13)

Comparative Study on Physiological and Blood Biochemical Indexes of Leizhou, Nubia and Their F1 Crossbred Goats Under Heat Stress

TONG Xiong1, MIN Li1, SUN Hao1, XU Bin1, DING Diyun1, LI Dagang1, WANG Gang1,2   

  1. 1. State Key Laboratory of Livestock and Poultry Breeding, Guangdong Key Laboratory of Animal Breeding and Nutrition, Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;
    2. Maoming Sub-center Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Key Laboratory of Livestock Disease Prevention of Guangdong Province, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
  • Received:2021-04-01 Online:2021-10-20 Published:2021-09-30

摘要: 本试验旨在研究广东地区夏季热应激对雷州山羊、努比亚羊及其杂交F1代生理和血液生化指标的影响,进而评估3个类群羊之间热适应性的差异。试验以各个类群5月龄的阉羊为研究对象,在广东夏季(2019年7月)全天温湿度指数(THI)均值为84.30的热应激环境下,正试期第1和2天在08:00、14:00、20:00 3个时间点测定羊群的4项生理指标,第3天采集羊群血液进行29项生化指标的测定分析。结果显示,3个类群羊的表皮温度(ST)、直肠温度(RT)、呼吸频率(RR)和心率(HR)随着08:00至14:00 THI的增高而增高,随着14:00至20:00 THI的下降而下降。在08:00和14:00平均THI高于82的热应激条件下,雷州山羊的RT和RR极显著或显著低于努比亚羊(P<0.01;P<0.05)。白细胞分类指标中,雷州山羊的嗜中性粒细胞比例(NEUTr)在3个类群羊中最高,且显著高于努比亚羊(P<0.05)。与此相反,雷州山羊的淋巴细胞比例(LYMPHr)在三者中最低,且显著低于努比亚羊(P<0.05)。血液电解质指标中,雷州山羊的钾离子(K+)在3个类群中最高,且极显著高于努比亚羊(P<0.01)。血清酶类活性指标中,努比亚羊的乳酸脱氢酶(LDH)活性在3个类群中最高,且显著或极显著高于其他2个类群羊(P<0.05;P<0.01)。相比雷州山羊和杂交F1代,努比亚羊的丙氨酸氨基转移酶(ALT)活性更高,这与LDH的趋势一致,但其仅显著高于杂交F1代(P<0.05)。对比血清酶类活性指标(ALT和LDH),三碘甲状腺原氨酸(T3)的激素水平在3个类群羊之间呈现相反的趋势,努比亚羊的T3最低,且显著低于雷州山羊(P<0.05)。应用3个类群羊组间差异显著性的血液生化指标进行PCA聚类分析时发现,雷州山羊与努比亚羊之间存在明显的群体分离,而杂交F1代介于2个亲本群之间。综合以上结果,试验羊在试验期间全天长时间处于热应激状态;试验羊的生理和血液生化指标受到热应激的影响,且反映出类群之间存在耐热性差异,雷州山羊的耐热性优于努比亚羊,而杂交F1代的耐热性介于2个亲本之间。

关键词: 热应激; 雷州山羊; 努比亚羊; 生理指标; 血液生化指标

Abstract: The purpose of this experiment was to study the effects of heat stress on physiological and blood biochemical indexes of Leizhou, Nubia and their hybrid F1 goats in Guangdong. Differences of heat adaptation performance were evaluated among the three groups. In this experiment, five-month-old wethers of each group were selected as the research objects. In a heat stress environment with the mean daily temperature humidity index (THI) of 84.30 in Guangdong summer (July 2019), four physiological indexes were measured at 08:00, 14:00 and 20:00 on the first two days of the experimental period, and 29 biochemical indexes were detected after blood collection on the third day of the experiment period. The results showed that skin temperature (ST), rectum temperature (RT), respiratory rate (RR) and heart rate (HR) of the three groups increased with the increase of THI from 08:00 to 14:00, and decreased with the decrease of THI from 14:00 to 20:00. When the mean THI was higher than 82 at 08:00 and 14:00, RT and RR of Leizhou goats were extremely significantly or significantly lower than those of Nubia goats (P<0.01;P<0.05). Among leukocyte classification indexes, neutrophil ratio (NEUTr) of Leizhou goats was the highest, and significantly higher than that of Nubia goats (P<0.05). On the contrary, lymphocyte ratio (LYMPHr) of Leizhou goats was the lowest among the three groups, and significantly lower than that of Nubia goats (P<0.05). Among blood electrolyte indexes, potassium ion (K+) of Leizhou goats was the highest among the three groups, and was extremely significantly higher than that of Nubia goats (P<0.01). Among serum enzyme indexes, lactate dehydrogenase (LDH) of Nubia goats was the highest among the three groups, and was significantly or extremely significantly higher than that of the other two groups (P<0.05;P<0.01). Alanine aminotransferase (ALT) of Nubia goats was higher than that of Leizhou goats and hybrid F1 goats, which was consistent with the trend of LDH, but it was only significantly higher than that of hybrid F1 goats (P<0.05). By comparing the two serum enzyme content indexes (ALT and LDH), hormone level of triiodothyronine (T3) showed an opposite trend among the three groups, and the T3 level of Nubia goats was the lowest, and significantly lower than that of Leizhou goats (P<0.05). The results of PCA cluster analysis showed that there was a significant population separation between Leizhou goats and Nubia goats, and hybrid F1 goats were between the two parent populations. Based on the above results, the experimental goats were in a heat stress state throughout the whole experiment period. Effects of heat stress on the physiological and blood biochemical indexes of the studied goats were identified, and which reflected the difference of heat resistance among groups. The heat resistance of Leizhou goats was better than that of Nubia goats, while the heat resistance of hybrid F1 goats was between the two parent goats.

Key words: heat stress; Leizhou goat; Nubia goat; physiological index; blood biochemical index

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