The heritability of pampiniform plexus vessel size and varicocoele in boars

Authors

Tasha R. Gruhot, University of Nebraska - LincolnFollow
Lea A. Rempel, USDA, Agricultural Research ServiceFollow
Matthew L. Spangler, University of Nebraska - LincolnFollow
Stephen D. Kachman, University of Nebraska-LincolnFollow
Benny E. Mote, University of Nebraska-LincolnFollow

ORCID IDs

Tasha R. Gruhot

Date of this Version

2019

Citation

Reprod Dom Anim. 2019;54:270–274.

Comments

© 2018 Blackwell Verlag GmbH

DOI: 10.1111/rda.13350

Abstract

Ultrasonography was used to capture a coronal–sagittal image of the veins of the pampiniform plexus (PP) and the testicular artery of 327 maternal‐line boars at approximately 6 months of age at the University of Nebraska—Lincoln. Varicocoele was diagnosed by two methods. Method 1 diagnosed varicocoele when the average vessel area on one side of the scrotum was 1.5 times larger than the average vessel area on the other side of the scrotum. Method 2 diagnosed varicocoele when the average vessel area on one side of the scrotum of a boar was 1.5 times larger than the average vessel on the same side of the scrotum of the boar’s cohorts (same population and year). Varicocoele was diagnosed in 23.17% and 15.1% of boars measured using method 1 and method 2, respectively. Ultrasonography showed to be an effective means to measure PP vessel size in boars and may even allow for earlier detection of varicocoele than by using palpation. Animal models were employed to estimate the heritability for: average area of right PP vessels (0.52), average area of the left PP vessels (0.46), varicocoele presence using method 1 (0.26) and varicocoele presence using method 2 (0.25). These heritability estimates suggest that vessel size and varicocoele could be selected against in breeding programmes to potentially improve boar semen quality.