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The objective of this study was to evaluate the effects of puerperal metritis (PM) on the first lactation (1st L) on transition cow health and reproduction of dairy cows in their second lactation (2nd L). Two farms were enrolled in this study (Farm A and B). In both farms, the following diseases were recorded during the first 30 DIM: clinical hypocalcemia, retained fetal membrane (RFM), PM, hyperketonemia, left displaced abomasum, and clinical mastitis. Cows were inseminated for first service using only timed AI after submission to a Double-Ovsynch protocol (Farm A) or inseminated after estrus detection using an automated activity sensor (Farm B). Based on the diagnosis of PM in the first and second lactation, cows were classified into 4 groups: (1) no PM in the 1st L and no PM in 2nd L (NoPM+NoPM), (2) no PM in the 1st L and PM in the 2nd L (NoPM+PM), (3) PM in the 1st L and no PM in the 2nd L
(PM+NoPM), and (4) PM in the 1st L and PM in the 2nd L (PM+PM). A total of 4,834 cows (Farm A) and 4,238 cows (Farm B) in the 2nd L were considered for statistical analyses. Statistical analyses were performed using SPSS for Windows. On both farms, cows with PM in their 1st L had greater odds for RFM and PM in their 2nd L, while there was no association of PM in the 1st L with any other nonuterine diseases in the 2nd L. On Farm A, pregnancy per AI at first AI was 43.4 ± 1.3, 31.3 ± 2.7, 39.4 ± 2.3, and 44.3 ± 4.7% and on Farm B was 53.8 ± 3.4, 39.3 ± 4.9, 49.5 ± 4.3, and 23.7 ± 6.0% for 2nd L cows in NoPM+NoPM, NoPM+PM, PM+NoPM, and PM+PM, respectively. Pregnancy loss at first AI was 6.9 ± 0.7, 12.5 ± 3.0, 9.3 ± 1.8, and 18.8 ± 4.9% for 2nd L cows, on Farm A and on Farm B it was 8.6 ± 1.5, 19.6 ± 5.3, 11.8 ± 3.0, and 26.9 ± 11.6% for cows in NoPM+NoPM, NoPM+PM, PM+NoPM, and PM+PM, respectively. On both farms, there was an association with uterine health classification and pregnancy loss in second lactation at first AI. Puerperal metritis in the first lactation is associated with longlasting negative effects for cows in their next lactation.