Home
http://www.virbac.fr/ http://www.boehringer-ingelheim.com/ http://www.novartis.com/ http://www.animalhealth.bayerhealthcare.com/
vetcontact
Vetrinär
Tiermedizin
  WELCOME  
vetcontact
Vetrinär
Tiermedizin
  Privacy Policy  
  Home  
  Login / Newsletter  
vetcontact
Vetrinär
Tiermedizin
  CONTACTS  
vetcontact
Vetrinär
Tiermedizin
  Classifieds  
  New Products  
  VetCompanies  
  VetSchools  
vetcontact
Vetrinär
Tiermedizin
  PROFESSION  
vetcontact
Vetrinär
Tiermedizin
  Edutainment  
  VetAgenda  
  Presentations  
  Posters  
  ESAVS  
  Specialisation  
vetcontact
Vetrinär
Tiermedizin
  INSIGHT  
vetcontact
Vetrinär
Tiermedizin
  Congress News  
  Picture Galleries  
vetcontact
Vetrinär
Tiermedizin
  PRODUCTS  
vetcontact
Vetrinär
Tiermedizin
  Bayer  
  Boehringer Ing.  
  Novartis  
  Virbac

 
  Simply book for less...  
    

Bovine    Equine    Small Animal Practice    Swine Practice    Articles    Vetjournal    
deutsch english español polski francais
Home / WELCOME / Archiv / Equine /     
 
Do wild ungulates develop `natural` antiparasitic behaviour?
Many owners of horses know that their animals try always to use only a certain place for defecation. Are selective defecation and selective foraging signs for a `natural` antiparasite behavior which is shown by grazing ungulates? An interesting question evaluated in this study which was published some weeks ago...

Selective defecation and selective foraging are two potential antiparasite behaviors used by grazing ungulates to reduce infection by fecaloral transmitted parasites.

While there is some evidence that domestic species use these strategies, less is known about the occurrence and efficacy of these behaviors in wild ungulates.

In this study, I examined whether wild antelope use selective defecation and selective foraging strategies to reduce exposure to gastrointestinal nematode parasites.

By quantifying parasite levels in the environment in relation to the defecation patterns of three species, dik-dik (Madoqua kirkii), Grant`s gazelle (Gazella granti), and impala (Aepyceros melampus), I found that nematode larval concentrations in pasture were higher in the vicinity of clusters of feces (dung middens) compared to single fecal pellet groups or dung-free areas. In addition, experimental feeding trials in free-ranging dik-dik showed that individuals selectively avoided feeding near concentrations of feces.

Given that increased parasite contamination was found in the immediate vicinity of fecal clusters, fecal avoidance could help reduce host consumption of parasites and may therefore be an effective antiparasite behavior for certain species.

On the other hand, while the concentration of parasite larvae in the vicinity of middens coupled with host avoidance of these areas during grazing could reduce host contact with parasites, results showing a positive correlation between the number of middens in a habitat and larval abundance at control sites suggest that dung middens might increase and not decrease overall host exposure to parasites.

If this is the case, dung midden formation may not be a viable antiparasite strategy.



Source: Ezenwa, Vanessa O. (2004): Selective Defecation and Selective Foraging: Antiparasite Behavior in Wild Ungulates?. In: Ethology 110 (11), 851-862.




Tell a friend   |   Print version   |   Send this article

EQUINE

Presumed Neuroglycopenia following Severe Hypoglycemia in Horsesmembers
Neuroglycopenia refers to a shortage of glucose in the brain resulting in neuronal dysfunction and death if left untreated. Presumed neuroglycopenia has not been described in horses. Thus, the objective of this retrospective study was to report neurological signs in horses with presumed neuroglycopenia as the result of severe hypoglycemia.

  • E321G MYH1 mutation and nonexertional rhabdomyolysis in Quarter Horsesmembers
  • Novel therapeutic approach for mares with suspected uterine tubal blockagemembers
  • Unusual cause of unilateral facial swelling in a coltmembers
  • Novel topical therapy of equine sarcoidsmembers
  • Conventional radiography versus CT to diagnose osteomyelitis in foalsmembers
  • Novel surgical treatment of recurrent laryngeal neuropathy in horses members
  • Standing repair of a fracture of the third metatarsal bone of a Hunt Thoroughbred mare members
  • Unusual cause of bilateral blindness in a young Quarter Horsemembers
  • Advanced imaging of an incomplete fracture of Os metacarpale III in a young Warmbloodmembers
  • Equine external beam radiation therapymembers
  • Insulin dysregulation in horses with SIRSmembers
  • The farrier role in supporting horse owners to prevent laminitismembers


  • [ Home ] [ About ] [ Contact / Request ] [ Privacy Policy ]

    Copyright © 2001-2018 VetContact GmbH
    All rights reserved