Temporal bovine liver gene expression

Liver from five Holstein cows fed to current National Research Council (2001) recommendations during the dry period and early lactation was biopsied at -65, -30, -14, 1, 14, 28, and 49 days relative to parturition. cDNA from liver and a reference standard (made from cattle tissues not including liver or mammary) were labeled with Cy3 or Cy5 fluorescent dye and co-hybridized to our 7,872 bovine cDNA microarray using a dye-swap design. More than 5,000 sequences present on the array were expressed in liver. Normalized log-transformed ratios (liver/reference) were analyzed using a MIXED model in SAS. Keywords: cow, liver, lactation, microarray, periparturient period Keywords: time-course