The association between occurrence and severity of subclinical and clinical mastitis on pregnancies per artificial insemination at first service of Holstein cows

Journal of Dairy Science
M J FuenzalidaP L Ruegg

Abstract

The objective of this prospective study was to determine associations between occurrence and severity of clinical (CM) and subclinical mastitis (SM) during a defined breeding risk period (BRP, 3d before to 32d after artificial insemination) on pregnancies per artificial insemination at first service (P/AI1). Dairy cows (n=3,144) from 4 Wisconsin herds were categorized based on the occurrence of one or more CM or SM events during and before the BRP: (1) healthy, (2) mastitis before BRP, (3) SM during BRP, (4) chronic SM, (5) CM during BRP, or (6) chronic CM. Clinical mastitis cases were categorized based on etiology (gram-negative, gram-positive, and no growth) and severity (mild, moderate, or severe). Compared with healthy cows, the odds of pregnancy were 0.56, 0.67, and 0.75 for cows experiencing chronic CM, CM, or SM during the BRP, respectively. The occurrence of chronic SM was not associated with reduced probability of P/AI1. Compared with healthy cows, the odds of pregnancy were 0.71 and 0.54 for cows experiencing mild or moderate-severe cases of CM during the BRP, respectively. The odds of pregnancy for cows experiencing CM caused by gram-negative or gram-positive bacteria during the BRP were 0.47 and 0.59, respectively. ...Continue Reading

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Citations

Jan 13, 2015·International Journal of Food Microbiology·Conor J DoylePaul D Cotter
Sep 22, 2010·Journal of Dairy Science·J E LombardD M Weary
Jan 25, 2011·Journal of Dairy Science·W OuweltjesJ L van Leeuwen
Aug 19, 2007·Journal of Dairy Science·C W R ComptonS McDougall
Nov 7, 2016·Journal of Dairy Science·J F GuarínP L Ruegg
Mar 12, 2017·Tropical Animal Health and Production·Narender KumarM Sivaram
Nov 21, 2017·Journal of Dairy Science·Pamela L Ruegg
Aug 23, 2019·The Veterinary Record·John RemnantChris David Hudson
Aug 12, 2019·Journal of Dairy Science·Randall L BondDixie F Mollenkopf
Feb 25, 2020·Journal of Dairy Science·F M DalaneziH Langoni
May 20, 2021·Reproduction in Domestic Animals = Zuchthygiene·Nan WangXu Zhou

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