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© 2022, Veteriner Fakultesi Dergisi. All rights reserved.The aim of the study was to analyse beta-hydroxybutyric acid concentration in the blood (BBAC) and milk (MBAC) at postpartum week 2 (PPW2) and week 4 (PPW4) in Holstein (n=216, 8 farms), Montbeliard (n=23), Simmental (n=38) and Holstein/Montbeliard Crossbreed (n=23, BBAC only). Furthermore, the prevalence of subclinical ketosis (SCK) and its association with postpartum health disorders (PPHD), body condition score (BCS) and average daily milk yield in 90 days in milk (90DIM) were evaluated in Holstein. Holstein-Crossbreed and Montbeliard had significantly lower postpartum BBAC than others. Primiparous Montbeliard and Holstein had significantly higher MBAC at PPW2 than PPW4. Cows having BCS2 and 4 at calving had higher MBAC at PPW2 and 4 that was associated significantly with metritis and multiple diseases. Holstein with BCS4 at calving had higher BBAC at PPW2 and 4. SCK prevalence in the blood (BBAC>1.2 mmol/L, BSCK) and milk (MBAC=100 |imol/L, MSCK1), (MBAC>200 |imol/L, MSCK2) and (MBAC>100 ^mol/L, MSCK1/2) was 8.3, 11.8, 5.8 and 17.3% at PPW2 and 4.7, 4.9, 6.9 and 11.9% at PPW4 in Holstein respectively. Holstein with SCK was more likely to develop PPHD in 90DIM. MSCK1 and MSCK1/2 did not associate milk production loss in Holstein. Holstein with BSCK and MSCK2 at PPW2 had a 6.7 kg loss of average daily milk yield in 90DIM. Culling rate was 3.7% in Holstein and MSCK2 positive Holstein at PPW2 was significantly more likely to be culled (25%, Odds:11.2, P |
