Ultrasound-assisted minimally invasive technique for tissue collection from bovine mammary glands.

Background And Aims: The objective of this case report was to describe an ultrasound-guided, minimally invasive method for longitudinal mammary gland tissue collection from the bovine species.

Materials And Methods: Biopsies were performed on 14 8-week-old calves and 113 10-week-old calves. A subset of 36 animals had repeated mammary gland biopsies through the first lactation.