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Johnsen et al. Acta Vet Scand (2019) 61:59
RESEARCH
Indirectquanti?cationof IgGusing
a digitalrefractometer,and factorsassociated with colostrumqualityin NorwegianRedCattle JulieFøske
Johnsen
1* , Johanne Sørby 2 , Cecilie MarieMejdell
1 , ÅseMargrethe
Sogstad
3 , AneNødtvedt
4 andIngrid
Hunter
Holmøy
4Abstract
Background:
Results:
Brix%(
theinternationalstandardof50 =0.71,P<0.001).ABrixConclusions:
toahighproportionofthesampleswith conditions.Keywords:
Welfare© The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License
http://creat ivecommons .org/licen ses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium,
provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license,
and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/
publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.Background
Collins[
4 ]estimatedthatthecalfneeds100-200 gofIgGwithin6 hafterbirth.Consequently,theconcentra
immunoglobulinsdefinedasFPT(<10 g/LIgGinserum
ofcalvesaged24-48 h).Awidelyusedcut-offlevelforOpenAccessActa Veterinaria Scandinavica*Correspondence:Julie.johnsen@vetinst.no
1Sectionof
Institute,Pb750Sentrum,0106
Oslo,Norway
Page2of9Johnsen et al. Acta Vet Scand (2019) 61:59 >50 g/L IgG[ 5 ].Otherimportantdeterminantsofcolostrum qualityaree.g.bacterialcontamination. 6 7 bovinecolostrumbasedonBrix%readings[e.g. 8 10 11 12 ].An colostrumqualityofNorwegianReddairycows[ 13 14 ].ColostrumIgGvariesatcowlevel[ 15 ,16],butalso betweenherds[ 13 ].?isvariationmightthereforebe periodmanagement. tionofcolostrumofhighquality(>50 g/L)definedby
NorwegianReddairycows.
Methods
Theherds
insufficientnumberofcalvings(< four)duringthesam questionnaire(Table 1).Additionally,aherdlevelassess 17 ].Farm performthesampling.Colostrumsampling
milkingafterbirthinto15 mL(TINENorwegianDairies) and50 mLtesttubes(FalconConicalCentrifugetubes,
pling.?ecolostrumsampleswerefrozen(18 °C) as
videdbytheresearchers(Table 2Quanti?cationof Brix%
formedononealiquot(i.e.the50 mLtesttubes)oftheQuanti?cationof IgG(g/L)
?eotheraliquot(i.e.the15 mLtesttubes)ofthecolos- wasusedtodetermineIgGconcentration(g/L).Statisticalanalysis
Corp.,CollegeStation,TX,USA).
Agreementof RIDvs.digitalrefractometerand diagnostic testevaluation Page3of9Johnsenet al. Acta Vet Scand (2019) 61:59 Table1Herdlevelvariableswith associatedIgGvaluesincludedin the statisticalanalysisof possibleriskfactors
for lowcolostrumqualityin 167colostrumsamplescollectedfrom 19herdsin a speci?cgeographicalregionin Norway
(Ringsakermunicipality,HedmarkCounty) VariableClassor mean(SD)Herds(N)Samples(n)IgG,g/L(SD)