China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (10): 3625-3634.doi: 10.16431/j.cnki.1671-7236.2021.10.013

• Animal Nutrition and Feed Science • Previous Articles     Next Articles

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

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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