บทคัดย่องานวิจัย

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Mites in feeds, occurrence, effects and importance.

Kamphues, J.; Schulze-Becking, M.;

Ubersichten zur Tierernahrung Year: 1992 Vol: 20 Issue: 1 Pages: 1-3 Ref: 123 ref.

1992

บทคัดย่อ

Mites in feeds, occurrence, effects and importance.

A review. Mite infestations are widespread in grains, concentrates and roughage, but they receive little attention, because most infestations remain undetected. A strong infestation by mites results in feed damage, nutrient losses (highly available carbohydrates, amino acids and vitamins), reduced storage time and palatability. Potential risks to health and performance are twofold: specific effects of the mites and secondary effects due to feed spoilage. Mite infestation alone has a negative effect on nitrogen retention and leads to immunological reactions in various species. Intake, contact with or inhalation of constituents of mite-infested feeds may provoke allergic symptoms (skin reactions, intestine or respiratory disturbances). Active mites infest the skin directly and may cause clinical symptoms in animals and man. A large number of case reports on the detrimental effects of mite-infested feeds on animal health is published, but many symptoms are caused by further deterioration of the feeds (pathogenic bacteria, high counts of moulds and yeasts, contamination by mycotoxins or toxic substances produced during spoilage), that were wrongly attributed to mites. If an infestation of mites is detected during simple visual checks of feed samples, detailed investigations are recommended for quantifying the infestation and to assess germ counts and presence of mycotoxins, especially when the feeds are suspected to be the cause of losses or health problems. When mites are found, it is essential to inspect and improve storage conditions (cleaning the feed store, control of humidity, temperature and storage time).