title: Production and health of cows given monensin prepartum and a high-energy diet postpartum.
abstract: The object of this study was to evaluate the impact of monensin administration on the early lactation performance of cows maintained on a high-energy diet, and on health traits during the transition period. Cows (n = 168; parity 3.3 +/- 1.4, initial body condition score 3.1 +/- 0.08, and milk yield of 34.3 kg/d +/- 0.9 for multiparous cows in the preceding lactation) were divided into control and monensin treatment groups. A controlled-release capsule supplying 335 mg of monensin/d for 95 d was inserted into the rumen of monensin-treated cows 30 d before the expected calving. Blood samples were obtained 2 h after feeding on d 14 prepartum and on d 7, 14, and 50 postpartum. Plasma glucose concentration was 3% higher (58 +/- 0.5 vs. 56.4 +/- 0.5 mg/dL) and beta-hydroxybutyric acid was 17% (6.7 +/- 0.3 vs. 8.0 +/- 0.3 mg/dL) lower in monensin-treated than control cows. Plasma glucose was 10% higher (60.0 +/- 0.6 vs. 54.5 +/- 0.3 mg/dL) and beta-hydroxybutyric acid was 16% lower (6.8 +/- 0.3 vs. 7.9 +/- 0.2 mg/dL) in primiparous than multiparous cows. Plasma nonesterified fatty acid concentration (measured only in primiparous cows) was 17% lower (287 +/- 15 vs. 336 +/- 17 muEq/L) in treated than in control cows. Rate of ketosis incidence was 60% lower (8 vs. 21%) in monensin-treated than in control cows, and the proportion of control cows that required a supply of glucogenic precursors was 3-fold higher than in monensin-treated cows. The body condition score was 3.1 +/- 0.05, 2.7 +/- 0.05, and 2.4 +/- 0.05 on d 60 prepartum and d 7 and 50 postpartum, respectively, and was not affected by treatment. During the first 5 mo of lactation, milk yield was 7% higher (37.6 +/- 0.6 vs. 35.2 +/- 0.6 kg/d) in monensin-treated cows than in control cows. Our results showed that monensin administration, as a controlled-release capsule in prepartum cows, can be beneficial, even if these cows are maintained on a high-energy diet during the subsequent lactation.
authors.affiliation: The Hebrew University of Jerusalem, Faculty of Agricultural, Food and Environmental Quality Sciences, Rehovot 76100, Israel. Arieli@agri.huji.ac.il
authors.forename: A
authors.initials: A
authors.lastname: Arieli
authors.forename: U
authors.initials: U
authors.lastname: Dicken
authors.forename: I
authors.initials: I
authors.lastname: Dagoni
authors.forename: Y
authors.initials: Y
authors.lastname: Spirer
authors.forename: S
authors.initials: S
authors.lastname: Zamwel
mesh_terms: D020155:3-Hydroxybutyric Acid / Q000097:blood; D000818:Animals; D001219:Aspartate Aminotransferases / Q000097:blood; D001786:Blood Glucose / Q000032:analysis; D001823:Body Composition; D002417:Cattle / Q000502:physiology*; D003692:Delayed-Action Preparations; D004032:Diet; D002149:Energy Intake / Q000502:physiology*; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D006304:Health Status; D007476:Ionophores / Q000008:administration & dosage*; D007774:Lactation / Q000187:drug effects*; D008892:Milk / Q000737:chemistry; D008985:Monensin / Q000008:administration & dosage*; D049590:Postpartum Period / Q000502:physiology; D011247:Pregnancy
chemical_list: D001786:Blood Glucose; D003692:Delayed-Action Preparations; D005230:Fatty Acids, Nonesterified; D007476:Ionophores; D008985:Monensin; D001219:Aspartate Aminotransferases; D020155:3-Hydroxybutyric Acid