【作者】 于军方； 梁学武； 张良荣； 刘庆华；

【Author】 Yu Junfang1 Liang Xuewu1 Zhang Liangrong Liu Qinghua1 (1 College of Animal Science,Fujian Agricultural and Forestry University,Fuzhou 350002; 2 Animal husbandry station of Jianning county,Fujian province 354500)

【机构】 福建农林大学动物科学学院； 福建省建宁县畜牧兽医站；

【摘要】 临床健康的荷斯坦乳牛和荷斯坦牛-娟姗牛杂交F1牛(荷-娟F1)各20头,分为2组,分别于冬季12月份(牛舍日平均气温为10.35℃,THI为47.24)和次年夏季7月份(牛舍日平均气温为38.07℃,THI为82.61)条件下,研究热应激对血清中丙二醛(MDA)含量,总超氧化物歧化酶(T-SOD)活力,总抗氧化能力(T-AOC)的影响。结果表明:热应激期间荷-娟F1血清中MDA含量显著低于荷斯坦牛(P<0.05);T-SOD活力显著高于荷斯坦牛(P<0.05);T-AOC有升高的趋势但差异不显著(P>0.05)。在非热应激期间,荷-娟F1与荷斯坦牛相比血清中的MDA含量、T-SOD活力和T-AOC均无显著差异(P>0.05)。荷-娟F1和荷斯坦牛在热应激期间的血清中MDA含量、T-SOD活力与非热应激期差异均极显著(P<0.01),荷斯坦牛血清中T-AOC差异显著(P<0.05),而荷-娟F1血清中T-AOC差异不显著(P>0.05)。由此表明,热应激对乳牛的抗氧化能力产生显著的影响;热应激期间荷-娟F1的抗氧化能力高于荷斯坦牛,更能适应热带和亚热带地区高温高湿的气候条件。更多还原

【Abstract】 The effects of heat stress on changes in the MDA contents,T-SOD and T-AOC activities were evaluated in two groups of 40 healthy Holstein and Jersey×Holstein dairy cows. These animals were subjected to a cool environment when the mean temperature-humidity index (THI) was 47.24 and temperature was 10.35℃ during the month of December. This experiment was repeated during the hotter month of July of the following year,when the mean THI was 82.61 and temperature was 31.07℃. The results were showed as follows: During heat stress period,compared with Holstein,the MDA contents of Jersey×Holstein evidently decreased(P<0.05)and T-SOD activities of Jersey×Holstein significantly increased(P<0.05),the T-AOC of Jersey ×Holstein no significantly increased. however,during non-heat stress period,there were no significant differences on the MDA contents ,the T-SOD and T-AOC activities between Jersey×Holstein and Holstein cow. the MDA contents decreased(P<0.01) and the T-SOD activities increased (P<0.01)of both Jersey×Holstein and Holstein cow;the T-AOC activities of Holstein serum increased evidently(P<0.05)between hot and cold season. The experiment results indicated that heat stress would do harm to dairy cattle significantly;during heat stress the anti-oxidation capability of Jersey×Holstein was higher than Holstein,Jersey×Holstein was more suitable to live in the tropic and semi-tropica area than Holstein. It provided a scientific theory for the diagnosis of heat stress and selecting heat-resistant dairy cattle.更多还原