Grape polyphenols: An ally to fight heat stress
Antioxidant diversification is essential to improve heat stress resilience and tackle the oxidative stress issue. In livestock, certain polyphenols from grape extracts allow to preserve a high level of performance and help combat the negative effects of heat stress.
BY CÉDRIC VANDENBOSSCHE AND DR PAUL ENGLER, NOR FEED L
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ooking at the metabolism of livestock animals, they all share a very similar antioxidant system, as each one plays a specific role at the molecular level. Vitamin E ensures the cell membrane stability while
vitamin C neutralises free radicals inside the cell. Then some enzymes are involved in the detoxification chain: the Superoxide Dismutase (SOD) initiates this process while the Glutathione Peroxidase finishes the process.
Consider the antioxidant system Such system is strongly solicited in modern farming due to high level of performance, even more in case of heat stress episodes, since the free radicals’ production increases lead to overwhelmed antioxidant defences. Nutritional strategies are major solutions to alleviate heat stress, as well as physical cooling measures. By increasing animal antioxidant intake, it is possible to compensate the loss due to lower feed
Figure 1 - Temperature Humidity Index during the trial period.
T° Maxi Average THI Thermoneutral THI Climatic conditions Alert THI
37 35 33 31 29
25 27
consumption, thereby reducing cell damages. Such strategy must consider the antioxidant system in its globality. Betting only on vitamins is insufficient. The best protection is set up once all the antioxidant mechanisms are stimulated, which also means increasing the antioxidant enzymatic activities.
Complete and efficient antioxidant cover Nor-Feed has built an expertise on animal stress since 2003 by developing its Nor-Grape range. The company draws at- tention specifically to heat periods, which can be extremely critical for animals. “At a nutritional level the best way to re- duce such negative impact is the diversification of the exoge- nous antioxidants. The cell, like a castle, is only well protected if using all the defences to fight. Numerous studies shows that betting only on high level of synthetic vitamin E or vitamin C is never the best option” explains Dr Paul Engler. By improving the antioxidants defences at every level, Nor-Grape compen- sates the oxidative stress. Several biological pathways have been identified, allowing the grape polyphenol product to act as a keystone by stimulating the production of certain endoge- nous defences while also regenerating vitamins E and C.
Heat stress impacts egg and chick quality Under heat stress, birds tend to deplete their antioxidant defences. In breeders, such oxidative stress lowers the concentration of immunoglobulins and phenolic compounds
▶ HEAT STRESS | MAY 2021
THI index
Average daily T° (°C)
PHOTO: ISTOCK
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