Characterization of metabolic changes during a protocol for inducing lactation ketosis in dairy cows.
During the 5 wk immediately after parturition, five high producing cows that were overfed prepartum completed a protocol for inducement of ketosis. By 12 d postpartum, hepatic glycogen decreased by 75% and hepatic triglyceride, beta-hydroxybutyrate, and acetoacetate increased by 6, 4, and 2.5 times. The protocol, initiated at 2 wk postpartum, consisted of a 15 to 20% decrease from ad libitum feed intake plus dietary supplementation with 1,3-butanediol, a ketogenic substrate. Severity of the ketotic state increased gradually, and four cows developed clinical signs of ketosis at an average of 36 d postpartum. Glycogen was 90% depleted, and triglycerides, beta-hydroxybutyrate, and acetoacetate concentrations in liver were increased to 10, 10, and 15 times above average prepartum concentrations. In plasma, beta-hydroxybutyrate increased and glucose decreased. Plasma insulin exhibited an initial postpartal decrease (40%) but then was stable at that concentration through 36 d. After treatment for ketosis, glucose and insulin concentrations of plasma were greater than prepartal concentrations. Results indicate that a relatively simple protocol of prolonged energy deficit combined with an influx of ketone body precursors can induce experimental lactation ketosis in overfed cows. The protocol should be a valuable tool for ketosis research.[1]References
- Characterization of metabolic changes during a protocol for inducing lactation ketosis in dairy cows. Mills, S.E., Beitz, D.C., Young, J.W. J. Dairy Sci. (1986) [Pubmed]
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