Effects of esterification, saturation and amount of fatty acids infused into the rumen or abomasum in lactating dairy cows.

Our objective was to determine the effects of chemical structure, amount, and site of infusion of long-chain fatty acids (LCFA) in lactating dairy cows. Six multiparous Holstein cows were used in a 6 × 6 Latin square design with 21-d periods. During d 1 to 14, 250 g/d of LCFA and during d 15 to 21, 500 g/d of LCFA were infused continuously into either the rumen or abomasum.

Clinical observations, biochemical data, and postmortem and histopathologic findings in young dairy calves fed zeolite clinoptilolite binder combined with milk replacer.

Objective: To identify any adverse effects on health or performance in young dairy calves fed clinoptilolite mixed with milk replacer.

Animals: 26 male Holstein calves (1 to 7 days old).

Procedures: Twice daily for 28 days, calves were fed milk replacer with no clinoptilolite (control group; n=8), 0.

Plane of nutrition prepartum alters hepatic gene expression and function in dairy cows as assessed by longitudinal transcript and metabolic profiling.

Liver metabolism and health in dairy cows during the periparturient period are affected by plane of nutrition prepartum. Long-term adaptations in hepatic gene expression are important for complete understanding of liver function. We examined temporal gene expression profiles during the dry period and early lactation in liver of Holstein cows fed moderate dietary energy ad libitum or restricted during the entire dry period using a microarray consisting of 7,872 annotated cattle cDNA inserts and quantitative RT-PCR.