title: Dry cow diet, management, and energy balance as risk factors for displaced abomasum in high producing dairy herds.
abstract: The objective of this study was to determine prepartum risk factors for displaced abomasum. The design was a prospective study of 1170 multiparous Holstein cows from 67 high producing dairy herds in Michigan. Each farm was visited four times within a 6-wk period. At each visit, data on nutrition and management were collected. All multiparous cows within 35 d of projected calving were assigned a body condition score, and blood was sampled to determine the concentration of nonesterified fatty acids in plasma. A multivariable linear regression model was used to determine risk factors associated with the incidence of displaced abomasum during lactation on a herd basis. A multivariable logistic regression model with random effect was used to determine risk factors for displaced abomasum on an individual cow basis. Significant risk factors for displaced abomasum included a negative energy balance prepartum (as estimated from plasma nonesterified fatty acids), a high body condition score, suboptimal feed bunk management prepartum, prepartum diets containing > 1.65 Mcal of net energy for lactation/kg of dry matter, winter and summer seasons, high genetic merit, and low parity.
authors.affiliation: Department of Large Animal Clinical Science, Michigan State University, East Lansing 48824, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Cameron
authors.forename: P B
authors.initials: PB
authors.lastname: Dyk
authors.forename: T H
authors.initials: TH
authors.lastname: Herdt
authors.forename: J B
authors.initials: JB
authors.lastname: Kaneene
authors.forename: R
authors.initials: R
authors.lastname: Miller
authors.forename: H F
authors.initials: HF
authors.lastname: Bucholtz
authors.forename: J S
authors.initials: JS
authors.lastname: Liesman
authors.forename: M J
authors.initials: MJ
authors.lastname: Vandehaar
authors.forename: R S
authors.initials: RS
authors.lastname: Emery
mesh_terms: D000018:Abomasum; D000818:Animals; D001823:Body Composition; D002417:Cattle / Q000502:physiology*; D004032:Diet; D002149:Energy Intake; D004734:Energy Metabolism; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D007774:Lactation; D012307:Risk Factors; D012621:Seasons; D013272:Stomach Diseases / Q000209:etiology / Q000662:veterinary*
chemical_list: D005230:Fatty Acids, Nonesterified