02619naa a2200409 a 450000100080000000500110000800800410001902400520006010000220011224501120013426000090024652014350025565000240169065000280171465000190174265000150176165000200177665000140179665000220181065000140183265000240184665000290187065000150189965000150191465000120192965000240194165000240196565000180198965300190200765300210202665300120204770000190205970000210207870000200209970000160211977300740213521547102023-07-01       2023    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1007/s11250-023-03559-72DOI1 aPFEIFER, L. F. M.  aEarly versus late body condition score loss in dairy cowsbreproductive performance.h[electronic resource]  c2023  aThis study aimed to compare milk production and reproductive performance in high yield Holstein cows that lose BCS early and late in the postpartum period. Lactating dairy cows (n = 76) were received frst timed AI at 60 to 75 DIM using the farm-managed estradiol-progesterone-GnRH?based timed AI protocol. The BCS of all cows was daily evaluated by automated BCS cameras. Aiming to evaluate the efect of the days in milk (DIM) in which a cow reached the nadir BCS on the reproductive parameters, cows were separated into two groups: early BCS loss (n = 42), cows that reached the nadir BCS ≤ 34 DIM, and late BCS loss (n = 34), cows that reached the nadir BCS &gt 34 DIM. The optimal cut-of point for determining the relationship between days to nadir BCS and pregnancy by 150 DIM (P150) was calculated using the receiver operating characteristic (ROC) curve. From the ROC analysis, the cut-of was 34 DIM (Se, 80.9%; Sp, 66.7%; AUC, 0.74; P &lt 0.01). No diferences (P&gt0.05) were detected between groups on the BCS and milk production. The average of milk production in both groups was 46.65 ± 6.15 Kg/day. Cows that reached the nadir BCS early postpartum presented lower (P &lt 0.01) calving interval and greater (P &lt 0.01) pregnancy at frst AI and P150. In summary, cows that lost BCS early had better reproductive performance and had similar milk yield compared with cows that lost BCS late in the postpartum period.  aAnimal reproduction  aArtificial insemination  aBody condition  aDairy cows  aMilk production  aOvulation  aPostpartum period  aPregnancy  aCondição Corporal  aInseminação Artificial  aOvulação  aPós-Parto  aPrenhez  aProdução Leiteira  aReprodução Animal  aVaca Leiteira  aCarambeí (PR)  aFazenda leiteira  aParaná1 aLIMA, R. A. de1 aNAKASHIMA, S. H.1 aSILVA, J. T. da1 aSCHMITT, E.  tTropical Animal Health and Productiongv. 55, article 149, Apr. 2023.