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Evaluation of mammary gland involution in dairy cows during the dry period using a 3-dimensional scanner.

J. Leite de Campos



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Evaluation of mammary gland involution in dairy cows during the dry period using a 3-dimensional scanner.
J. Leite de Campos*, J. Strickland, J. Gandy, L. M. Sordillo, C. Robison, P. L. Ruegg. Michigan State University East Lansing, MI.

Mammary gland involution is an important process during the dry period, and it is associated with immune defenses and the capability to prevent intramammary infection that could affect subsequent lactations. Currently methods to evaluate udder involution during the dry period are limited. The objective of this research was to compare the use of a 3D scanner and a metric tape to measure mammary gland involution in dairy cows. Clinically healthy Holstein cows (n = 15) of parity 2 through 5 were included in the study if they had a SCC < 200.000 cells/mL at the end of lactation. Mammary gland dimensions were measured at the dry off (d 0), and 2, 7, and 14 d later using both a 3D Scanner (Structure Sensor, Occipital, San Francisco) and manual measurements of marked areas between the middle rear left and right quarters and the median suspensory ligament. Data was collected from November 2019 — February 2020. Files obtained from the 3D scanning were analyzed for surface area of the rear quarters using 3- Matic software (Materialise, Belgium). Percentage change was calculated between measurements obtained at d 0, and measurements taken at d 2, 7, and 14. Analysis of variance was performed to analyze data. When measured manually using a metric tape, the width of the quarters increased and then decreased and were 117%, 101%, and 93% on d 2, 7, and 14, respectively. When measured using a 3D scanner, the surface area of the rear quarters was 125%, 100%, and 89% on d 2, 7 and 14 respectively. No significant difference in measurements was found based on method (P = 0.88). When width was measured manually, an increase in 16% and a decrease in 24% was observed from d 2 to 7 and d 2 to 14 (P < 0.01). When surface area was measured using the 3D scanner, it increased 25% and decreased 36% between d 2 to 7 and d 2 to 14, respectively (P < 0.001). No significant change in mammary gland dimensions was observed from d 7 to 14 (P > 0.08). Changes in mammary gland dimensions during the dry period were quantifiable using either manual measurements or 3-D scanning.

Keywords: dry period, udder involution, 3-dimensional scanner.

Biography: My name is Juliana, and I am a PhD student at Michigan State University. I am originally from Brazil and I came to the United States to work with Dr. Pamela Ruegg because I am super interested in milk quality.