title: Changes in oxidative status in periparturient dairy cows in hot conditions.
abstract: We investigated the changes in the plasma concentrations of oxidative stress markers in periparturient dairy cows in hot conditions. This study was performed on 10 cows from day -5 to day 10 after parturition. The experimental duration was divided into three periods: period 1 (5 days before parturition); period 2 (5 days after parturition); and period 3 (from day 6 to day 10 after parturition). The average rectal temperature in the cows during the experimental period was more than 39 °C. Plasma aspartate aminotransferase activities in periods 2 and 3 were higher than that in period 1 (P<0.05). Blood urea nitrogen concentration in period 3 was lower than those in periods 1 and 2 (P<0.05). The total ascorbic acid concentration in the plasma in period 2 was greater than those in periods 1 and 3 (P<0.05). Thiobarbituric acid reactive substances (TBARS) concentrations in periods 2 and 3 were greater than that in period 1 (P<0.05). TBARS concentration was positively correlated with aspartate aminotransferase activity (P<0.05). These results suggested that oxidative stress increased in cows after parturition under hot climatic conditions.
authors: National Agricultural Research Center for Kyushu Okinawa Region, Koshi, Kumamoto, Japan. mtmt@affrc.go.jp
authors: Masahito
authors: M
authors: Tanaka
authors: Yuko
authors: Y
authors: Kamiya
authors: Tomoyuki
authors: T
authors: Suzuki
authors: Yutaka
authors: Y
authors: Nakai
mesh_terms: D000818:Animals; D001205:Ascorbic Acid / Q000097:blood; D001219:Aspartate Aminotransferases / Q000097:blood; D001806:Blood Urea Nitrogen; D002417:Cattle / Q000097:blood / Q000502:physiology*; D002980:Climate; D005260:Female; D018384:Oxidative Stress / Q000502:physiology*; D058725:Peripartum Period / Q000502:physiology*; D011247:Pregnancy; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis
chemical_list: D017392:Thiobarbituric Acid Reactive Substances; D001219:Aspartate Aminotransferases; D001205:Ascorbic Acid