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Prepartum skeletal muscle reserves and branched-chain volatile fatty acid supplementation have minimal effects in response to intravenous glucose tolerance tests in periparturient dairy cattle.
JDS Commun
January 2025
Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.
Periparturient dairy cows experience metabolic adaptations to prepare for increased nutrient requirements of the fetus and the onset of lactation. Adaptations include increased peripheral tissue insulin resistance, which can be evaluated experimentally using intravenous glucose tolerance tests (IVGTT). The objective of this study was to determine if prepartum skeletal muscle reserves and supplementation of branched-chain volatile fatty acids (BCVFA) in the prepartum period affected blood glucose, β-hydroxybutyrate (BHB), and insulin concentrations 2 wk prepartum and 1 wk postpartum utilizing an IVGTT.
View Article and Find Full Text PDFInsulin, IGF-I, and lactoferrin concentrations and yields and their associations with other components within colostrum, transition, and whole milk of primiparous and multiparous Holstein cattle.
JDS Commun
January 2025
Department of Animal Biosciences, Animal Science and Nutrition, University of Guelph, Guelph, ON, Canada N1G 1Y2.
The primary objective of the study was to characterize concentrations and yields of lactoferrin (LF), insulin, and IGF-I in colostrum, transition milk (TM), and whole milk (WM) of multiparous (MP) and primiparous (PP) cows. A secondary objective was to determine associations between colostrum and TM components (fat, protein, lactose), IgG, and bioactive compounds (oligosaccharides, LF, insulin, IGF-I; defined as compounds present in micro quantities that stimulate physiological responses systemically or locally within the neonate). Holstein cows (10 MP and 10 PP) were assigned to the study at calving and colostrum was collected 5.
View Article and Find Full Text PDFTemporal patterns of liver and adipose lipase abundance across the periparturient period in multiparous Holstein dairy cows.
JDS Commun
January 2025
Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI 53706.
Lipases such as patatin-like phospholipase domain-containing protein 3 (PNPLA3) exist in multiple tissue types. In subcutaneous adipose tissue, PNPLA3 was not altered during the periparturient period. Conversely, strong associations between liver PNPLA3 and liver triglyceride content peripartum were identified and confirmed to be causative using knockdown approaches in a primary bovine hepatocyte model.
View Article and Find Full Text PDFTissue-specific responses to oxidative fuel source preference during heat stress in lactating dairy cows.
JDS Commun
January 2025
School of Animal Sciences, Virginia Tech, Blacksburg, VA 24061.
Prolonged exposure to high environmental temperatures results in an accumulated heat load that induces a heat stress (HS) response in dairy cattle. Heat stress compromises dairy farm profitability by reducing milk yield, altering milk composition, and hindering reproductive performance. The ability to alternate between carbohydrate and lipid sources for energy production is termed metabolic flexibility (Met Flex).
View Article and Find Full Text PDFEffect of anthocyanin rich black sugarcane on milk production and antioxidant capacity in lactating dairy cows.
Sci Rep
January 2025
School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand.
This study aimed to explore the effect of anthocyanin-rich black sugarcane on milk production, plasma antioxidant capacity, and the storage period DPPH scavenging capacity of milk in lactating dairy cows. Sixteen lactating dairy cows were stratified and randomly assigned into two balanced dietary groups, namely Anthocyanin-rich black sugarcane (AS), and Napier grass (NG). The AS group demonstrated a significant decrease (p < 0.
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