Effect of high environmental temperatures on ascorbic acid, sulfhydryl residue and oxidized lipid concentrations in plasma of dairy cows

Abstract

Information on oxidative stress under hot conditions from the levels of cells to organs and the whole body has accumulated in the last decades. Although a hot climate decreased dairy performance, changes of oxidative stress markers under hot conditions have remained obscure. Therefore, the effect of high environmental temperature on ascorbic acid, sulfhydryl (SH) residue and oxidized lipids concentrations in plasma from a total of 128 dairy cows was investigated. The monthly average maximum day temperature varied from 9.2°C in January to 32°C in August of 2004 in this institute. High ambient temperatures increased the rectal temperature of dairy cows up to 39.3°C in August. One of the reducing equivalents in plasma, SH residue concentration, decreased in July compared with December (P < 0.05). Another antiradical molecule, ascorbic acid concentration in plasma, also decreased in July (P < 0.01). The oxidative stress index, thiobarbituric acid reactive substance (TBARS), which was produced from the oxidation of polyunsaturated fatty acids under oxidative conditions, increased in summer (P < 0.05). A significant positive relationship of SH residue and ascorbic acid concentrations in the hot season was observed (P < 0.01). A negative correlation between rectal temperatures and ascorbic acid concentrations in the hot season was obtained (P < 0.01). However, TBARS concentration varied independently of the SH residue and ascorbic acid concentration. These results suggest that the response of oxidative stress markers of SH residue, ascorbic acid and TBARS concentration to oxidative stress under hot conditions were not shown to be the same, and that oxidative stress in dairy cows in the hot season increased.

Effect of different temperature humidity indices onantioxidant parameters in Surti buffaloes

“…Similar increase in TBARS concentration was observed in heat exposed Holstein cows by Bernabucci et al (2002). Dietary supplementation of ascorbic acid resulted in lower TBARS concentration (Tanaka et al, 2007). This is due to the fact that ascorbic acid acts as a chain blocker of lipid peroxidation.…”

Effect of Distiller's Dried Grains with Solubles (DDGS) Feeding to Dairy Cows on Oxidative Status under Hot Condition

“…The values of three oxidative stress markers in plasma just before the experimental period showed no differences between the DDGS and control groups and the oxidative stress markers in cow plasma did not change drastically (Table 4). The SH residue and ascorbic acid concentration in plasma tend to be higher in the DDGS group than the control group, while the alteration of either compound in plasma can be considered an indicator of the oxidative stress status in cows 20 . However, the concentration of TBARS as another oxidative stress marker 13 , especially the oxidized product of polyunsaturated fatty acid in plasma, was found to be significantly decreased in the DDGS group on the 17th day (P < 0.05).…”

“…One of the distiller's grain, distillation residue of Awamori spirit contains several antioxidative components, cyclic dipeptides, which shown reducing activity 0.89 to 4.2 times that of Lascorbic acid 19) . Oxidative stress in cows at higher ambient temperature was increased 20) and the milking performance in hot conditions shown a negative correlation with oxidative stress in dairy cows 21) . Information on the influences of DDGS feeding to dairy cows in hot conditions on the oxidative status in cows is limited.…”

Effects of shade on physiological changes, oxidative stress, and total antioxidant power in Thai Brahman cattle

“…Oxidative stress corresponds to an imbalance between the rate of oxidant production and that of their degradation (Sorg 2004). This condition is believed to be involved in the etiology of many diseases, and to reduce the metabolic activity of several tissues, consequently decreasing the performance of domestic animals (Tanaka et al 2007). Valtorta and Gallardo (2004) reported that housing and shade could reduce heat stress during the summer season.…”