in the eggs. This directly impacts the chick quality, threatening their immunity and livability. Moreover, newly hatched chicks are not able to assimilate vitamin E from the diet effectively and are dependent on its reserve built during embryonic development. Increased vitamin E dietary supplementation of the newly hatched chick has limited ability to increase their vitamin E status. This makes young birds very dependent of the breeder antioxidant status. Standardised grape polyphenols from Nor-Grape are well assimilated. Studies have shown the increase of total phenolic compounds (+18%) and more specifically of the alpha tocopherol (+15%) in eggs when laying hens where supplemented with 20ppm of Nor-Grape. Converging observations were made with broilers vaccinated against Gumboro and Infectious Bronchitis under artificial thermal discomfort (30°C). Birds which received 30ppm of the grape polyphenol product did express 82% of vaccination success while only 45% of the control birds were immunised thanks to the vaccines.
Polyphenols impact on sow performance Heat stress is known to have huge impacts on growing and adult pigs, due to their poor capacity to dissipate heat. Heat waves are associated with higher mitochondrial activities and a gap in the feed consumption, which impact the antioxidant status. In maternity, serious impacts are deplored. During
gestation, the high production of free radicals disrupts the nidation leading to dramatic decreases in prolificacy, while in lactation, higher oxidative stress reduces the colostrum quali- ty and quantity. This can be fatal for the litter. A trial was con- ducted under hot season in Vietnam on 88 sows. Nor-Grape was given from weaning to three weeks after insemination, so on a period of 28 days covering insemination and the early gestation. High humidity and temperature reaching up to 35°C led to an important heat stress for sows (Figure 1). Sows which received the grape polyphenol product on early gesta- tion gave birth to one extra piglet/litter resulting in +2,6kg piglets/litter at farrowing.
Rumen-protected version of Nor-Grape To ensure equivalent benefits in ruminants, Nor-Feed has de- veloped an encapsulated form of the product called Nor- Grape BP-O. The rumen-protected technology ensures the stability of the grape polyphenols within the rumen and thus ensures the optimisation of its use by the animal. Better co- lostrum quality (+42% IgG) and higher milk production (+1,84kg/cow/d) are some of the benefits overserved.
References are available on request
To know more about Nor-Feed’s trials and other products for animal health send a message to
contact@norfeed.net.
▶ HEAT STRESS | MAY 2021 55
Polyphenols from grape extracts can help tackle heat stress in livestock.
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