01728nas a2200265   4500000000100000008004100001260007000042653001500112653001800127653000800145653001200153653001100165653001400176100002600190700001600216700001500232700001800247700001200265700001300277700001300290245013900303490000800442520099800450022001401448       2018                            d  c11/2018bSchlütersche Verlagsgesellschaft mbH & Co. KGaHannover10aBaltic Sea10aostertagiosis10aODR10aEstonia10aLatvia10aLithuania1 aK Płoneczka-Janeczko1 aJ Piekarska1 aM Sarkunas1 aA Malakauskas1 aT Nagas1 aA Gamian1 aK Rypula00aPresence of antibodies against Ostertagia ostertagi in bulk tank milk from cattle herds in the northeastern Baltic countries of Europe0 v1313 aOstertagia (O.) ostertagi is a common cattle parasite that can be found on all  cattle farms where animals have access to pastures. To evaluate the presence of  anti-O. ostertagi antibodies in cattle herds, bulk tank milk (BTM) samples were  evaluated using a commercial ELISA test (SVANOVIR® O. ostertagi Ab ELISA, Svanova,  Sweden). Samples (n=830) were collected from dairy cattle herds in Estonia, Latvia,  Lithuania, and Poland. The average BTM optical density ratio (ODR) values in Poland  and Estonia were 0.400 and 0.493, respectively. Higher BTM ODRs were obtained in  samples collected in Lithuania (0.695) and in Latvia (0.703), which may correlate with  the reduction in milk yield by 0.75–1.2 kg of milk per cow per day in Lithuania and  Latvia. The first investigations on ostertagiosis using BTM samples were conducted  in Poland in 2011. To our knowledge, this is the first report to use BTM ELISA ODRs to  evaluate ostertagiosis in cattle in Estonia, Latvia, and Lithuania.  a0005-9366