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Table 1 Description of variables used in the main statistical calculations

From: Plasma Vitamin E and Blood Selenium Concentrations in Norwegian Dairy Cows: Regional Differences and Relations to Feeding and Health

Variable Description
Analytical:
TOC Plasma a-tocopherol concentration, μg/ml
SEL Blood selenium concentration, μg/g
Obtained from the questionnaires:
DATE Date of blood sample
YIELD Daily milk yield of sampled cow at sampling time, kg
CONC Daily amount of concentrates fed to the cow at sampling time, kg
REGSIL Daily amount of regular silage fed to the cow at sampling time, kg
QUALSIL Quality of regular silage fed to the cow, scale 1–4
BALE Daily amount of baled silage fed to the cow at sampling time, kg
HAY Daily amount of hay fed to the cow at sampling time, kg
STRAW Daily amount of ammoniated straw fed to the cow at sampling time, kg
MIN Daily amount of mineral supplement fed to the cow at sampling time, g
Obtained from the Norwegian Dairy Herd Recording System and the Norwegian Cattle Health Recording System:
CALVNUMB Parity number*
CALVDATE Last date of calving
COWMAST The sampled cow was treated for mastitis** in the same lactation*
COWACMA The sampled cow was treated for acute clinical mastitis in the same lactation*
COWPARES The sampled cow was treated for parturient paresis in the same lactation*
COWKETOS The sampled cow was treated for ketosis in the same lactation*
COWREPRO The sampled cow was treated for reproductive disorders in the same lactation*
Calculated from other variables:
DAYSPP DATE - CALVDATE
TOTSIL REGSIL + BALE
  1. * Class variable.
  2. ** Encompasses all recorded mastitis treatments, included treatments for acute clinical mastitis, subacute/chronic and subclinical mastitis.