title: Effects of supplementing glycerol and soybean oil in drinking water on feed and water intake, energy balance, and production performance of periparturient dairy cows.
abstract: The objective of this study was to determine the effects of supplementing glycerol and soybean oil in drinking water on feed and water intake, calculated energy balance, and production performance of periparturient dairy cows. Ninety multiparous Holstein dairy cows were randomly assigned to 1 of 3 treatments: 1) no nutrients supplemented in the drinking water (control); 2) 20 g/L of glycerin supplemented in the drinking water (glycerol); and 3) 10 g/L of soybean oil supplemented in the drinking water (SBO). The trial lasted from 7 d prepartum to 7 d postpartum. Cows were offered a close-up and milking cow TMR for ad libitum intake, pre- and postpartum, respectively. The dry matter intake of cows supplemented with glycerol and SBO was lower than for the control cows throughout the experimental period but not different from each other. Water intake for the control cows was greater than the average for the glycerol and SBO cows prepartum, and greater than for SBO cows but similar to that of glycerol cows postpartum. Glycerol cows consumed more water than SBO cows. There were no differences in energy intake and energy balance of the cows pre- and postpartum. Serum triacylglycerol concentration for glycerol cows was lower than for the control and SBO cows prepartum and was lower than for the SBO cows postpartum. There were no differences in the serum nonesterified fatty acids and glucose concentrations throughout the experiment. There were no differences in the serum beta-hydroxybutyrate (BHBA) concentrations at parturition, but serum BHBA concentration of the glycerol cows was greater than for control and SBO cows during the prepartum period. However, during the postpartum period, serum BHBA concentrations of the control cows were greater than for glycerol and SBO cows. There were no differences in calf birth weights or milk yield and composition. Although the glucogenic property of glycerol supplemented in the drinking water at 20 g/L may not have been sufficient to elicit a milk yield response, it did reduce the concentration of BHBA postpartum.
authors.affiliation: Department of Animal and Poultry Science, University of Guelph, Ontario, Canada. vosborne@uoguelph.ca
authors.forename: V R
authors.initials: VR
authors.lastname: Osborne
authors.forename: N E
authors.initials: NE
authors.lastname: Odongo
authors.forename: J P
authors.initials: JP
authors.lastname: Cant
authors.forename: K C
authors.initials: KC
authors.lastname: Swanson
authors.forename: B W
authors.initials: BW
authors.lastname: McBride
mesh_terms: D020155:3-Hydroxybutyric Acid / Q000097:blood; D000818:Animals; D001824:Body Constitution / Q000502:physiology; D001835:Body Weight / Q000502:physiology; D002417:Cattle; D003612:Dairying; D019587:Dietary Supplements; D004326:Drinking / Q000502:physiology*; D004435:Eating / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D005990:Glycerol / Q000008:administration & dosage*; D007774:Lactation; D008892:Milk / Q000737:chemistry / Q000378:metabolism; D049590:Postpartum Period; D011247:Pregnancy; D011897:Random Allocation; D013024:Soybean Oil / Q000008:administration & dosage*; D014280:Triglycerides / Q000097:blood; D014867:Water / Q000737:chemistry*
chemical_list: D005230:Fatty Acids, Nonesterified; D014280:Triglycerides; D014867:Water; D013024:Soybean Oil; D005990:Glycerol; D020155:3-Hydroxybutyric Acid