title: [Lactational incidences of common diseases in dairy herds in Schleswig-Holstein (Germany): effect of first test-day milk yield, herd milk yield and number of lactation].
abstract: It was the aim of this study to record common diseases in dairy cows in Schleswig-Holstein, Germany, and to describe associations between lactation number (LN: 1, 2, > 2), first test-day milk yield (TD1: < 30 kg, ≥ 30 kg) and herd milk yield (HM: ≤ 7500 kg, > 7500 kg), the latter parameter serving as a proxy for herd management (extensive vs. intensive). Data of 98 dairy herds (6439 lactations) were processed on cow level using mixed logistic regression models with LN< TD1, HM and calving season as fixed effects and herd as random effect. Lactational incidences were as follows: hypocalcaemia (5.0%), dystocia (13.2%), retained placental membranes (7.2%), clinical metritis/endometritis (4.9%), clinical mastitis (15.3%), subclinical mastitis (61.9%), ketosis (1.6%), displaced abomasum (0.4%), lameness (15.4%). Number of lactation (2, > 2 vs. 1) was a risk factor for hypocalcaemia (OR 3.715, 23.047), retained placental membranes (OR 1.764, 2.479), clinical mastitis (> 2 vs. 1 OR 2.118), subclinical mastitis (OR 1.668,4.397), ketosis (> 2 vs. 1 OR 3.936) and lameness (OR 1.275, 2.070). Older cows had a lower risk for dystocia (OR 0.373, 0.357). TD1 (≥ 30 kg) was not a risk factor of disease except for subclinical mastitis in first parity animals (OR 1.319). Herd milk yield (> 7500 kg) was a risk factor for clinical metritis/endometritis (OR 1.971), displaced abomasum (OR 7.764), lameness (OR 1.618) and hypocalcaemia (cows with high TD1 [OR 2.273]). In conclusion, not individual milk yield, but herd milk yield as an indicator of differences in intensity of herd management as well as number of lactation seemed to influence the frequency of common diseases in dairy cows.
authors.forename: Natascha
authors.initials: N
authors.lastname: Gundling
authors.forename: Inga
authors.initials: I
authors.lastname: Ruddat
authors.forename: Kristin
authors.initials: K
authors.lastname: Prien
authors.forename: Birte
authors.initials: B
authors.lastname: Hellerich
authors.forename: Martina
authors.initials: M
authors.lastname: Hoedemaker
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D003612:Dairying; D005260:Female; D005858:Germany / Q000453:epidemiology; D006996:Hypocalcemia / Q000453:epidemiology / Q000662:veterinary; D015994:Incidence; D007774:Lactation; D008414:Mastitis, Bovine / Q000453:epidemiology; D018457:Placenta, Retained / Q000453:epidemiology / Q000662:veterinary; D011247:Pregnancy