Shaping the future of animal health
South Africa

LIVER FLUKE IN CATTLE - THE ECONOMIC IMPACT

Corné Mostert

The economic impact of liver fluke can be very substantial. Liver fluke infection causes a reduction in growth rates (ADG), reduced milk production, reduced fertility, liver condemnation at the abattoir, mortalities (deaths) and secondary infections.

IMPACT ON MILK PRODUCTION

In high risk fluke areas liver fluke is a significant threat to optimal milk production. The effect of liver fluke on milk is well documented.2

  • Milk loss due to liver fluke infection can amount up to 1kg/day.  Over a lactation period of 300 days, it translates to a loss in milk production of up to 300 litres per cow3.  With a producer milk price of R5,15/lt, it translates to a possible loss of R1545 per cow per lactation!
  • A high incidence of liver fluke infestation does not only reduce milk production, but also negatively affect the quality of the milk produced due to a reduction in the milk butterfat concentration1.

Reduction_Of_Milk_Production.jpg

IMPACT ON GROWTH IN CALVES

Liver fluke can affect weight gains (ADG) in all cattle, but especially in young and growing cattle. A heavy infestation of 200 fluke per calf, can cost up to 28,5% in reduced weight gain 4,5

The graph below shows the reduction in body weight expressed as weight loss on calves - depending on the severity of liver fluke infestation2

Reduction_In_Bodyweight.jpg 

A reduced growth rate could affect the general development of the calf and can lead to reduced weaning weights or a delay reaching puberty (breeding age). Both these conditions have a major economic impact. With the current weaner price of >R25/kg, a small reduction in weaning weight will mean a big loss in income.

LIVER CONDEMNATION

The loss of income due to liver condemnations caused by liver fluke infestation, can exceed R100 per animal slaughtered!

 Liver_Condemnation.jpg

Implement a STRATEGIC CONTROL STRATEGY year-round, using the most efficient products to REDUCE THE ECONOMIC IMPACT caused by liver fluke.

Lewerslakbesmettings kan ‘n groot ekonomiese impak hê deurdat dit lei tot verlaagde groeitempo’s (GDT), verlaagde  melkproduksie, verlaagde vrugbaarheid, lewers wat afgekeur word by die abbatoir, mortaliteite (vrektes) en sekondêre infeksies.

DIE IMPAK OP MELKPRODUKSIE

In hoërisiko lewerslakareas is lewerslakbesmettings 'n groot bedreiging vir melkproduksie. Die effek van lewerslakbesmettings op melkproduksie  is goed gedokumenteer2.

  • Melkverlies as gevolg van lewerslak besmetting kan tot 1 kg / dag wees. Oor ‘n laktasieperiode van 300 dae is dit 300 liter in melkproduksie verlies per koei per jaar. Met ‘n melkprys van R5,15 kan die verlies R1545 per koei tot gevolg hê.
  • Hoë lewerslak besmetting kan die bottervetkonsentrasie in die melk  verminder¹.

 

Vermindering_in_melkproduksie.jpg

DIE IMPAK OP GROEI BY KALWERS

Lewerslakbesmetting het ‘n negatiewe effek op gewigstoename, veral by jong en groeiende beeste. ‘n Swaar besmetting van 200 slakke per kalf, kan ‘n afname in groei van tot 28.5% tot gevolg hê4,5.

Die onderstaande grafiek wys die afname in liggaamsmassa wat verwag kan word by matige en swaar besmettings2.

Verminder_in_liggaamsmassa.jpg 

Laer gewigstoenames beïnvloed die algehele ontwikkeling van die kalf en lei tot laer speenmassas. Dit kan ook lei tot vertraging in die bereiking van puberteid (teelouderdom). Beide die toestande het ‘n groot ekonomiese impak. Teen die huidige speenkalfpryse van >R25/kg, kan laer speenmassas ‘n groot verlies aan inkomste beteken!

AFKEURINGS VAN LEWERS

Die verlies aan inkomste as gevolg van lewers wat by die abbatoirs afgekeur word a.g.v  lewerslakbesmetting, beloop maklik R100 per afgekeurde lewer!

 Afkeuring_van_lewers.jpg

Maak gebruik ‘n volgehoue STRATEGIESE BEHEERPROGRAM en die gebruik van die mees effektiewe produkte, om die EKONOMIESE IMPAK van lewerslak te VERMINDER

Kontak u Virbac verteenwoordiger vir 'n volledige lewerslak beheer program.

 

References/verwysings

  1. Department of Agriculture and Rural development, Technical Note, Dairy 13 April 2003
  2. Ross JG (1970) British Veterinary Journal, 126; xiii-xx
  3. The University of Reading, department of Agricultural and food Economics, The Economics of Fascioliasis  (Liver Fluke)
  4. Dargie DJ (1986) in Ed. MJ Howell, Parasitology, Quo Vadit 1986.
  5. Hutton Oddy, Meat and Livestock Australia, 2003 Armidale Feeder Steer School.