title: Energy content of reduced-fat dried distillers grains with solubles for lactating dairy cows.
abstract: Eight Holstein and 8 Jersey multiparous, lactating cows were used to complete 56 energy balances to determine the energy content of reduced-fat dried distillers grains with solubles (RFDDGS). A repeated switchback design was used to compare treatments with and without RFDDGS. Diets consisted of 24.2% corn silage, 18.4% alfalfa hay, 6.94% brome hay with either 22.9% rolled corn or 14.8% soybean meal (control), or 8.95% rolled corn, 28.8% RFDDGS, and 0% soybean meal [Co-P; dry-matter (DM) basis]. The inclusion of RFDDGS did not affect DM intake, averaging 21.4 ± 0.53 kg of DM for all cows, but milk production tended to increase from 29.8 to 30.9 ± 1.46 kg/d for control and Co-P treatments, respectively. Milk fat percentage and energy-corrected milk did not differ between treatments, averaging 4.33 ± 0.14% and 34.1 kg/d, respectively. Milk protein was significantly decreased by the Co-P treatment (3.56 and 3.41 ± 0.08% for control and Co-P treatments), but protein yield was not affected. Milk energies were 1.40 Mcal/d greater with Co-P. Energy lost as methane was reduced by 0.31 Mcal/d with the addition of RFDDGS to the diet. Heat loss averaged 29.9 ± 0.55 Mcal/d and was not different between diets. Average energy retained as tissue energy was -2.99 ± 0.93 Mcal/d and did not differ between treatments. Intake of digestible and metabolizable energy were not different between the control and Co-P treatments, averaging 2.68 and 2.31 Mcal/kg of DM, respectively. The net energy of lactation values of control and Co-P diets were calculated to be 1.43 and 1.47 Mcal/kg of DM, respectively. These energy estimates suggest greater energy content of diets containing RFDDGS than diets containing a mixture of corn and soybean meal in lactating dairy cows.
authors.affiliation: Department of Animal Science, University of Nebraska-Lincoln, Lincoln 68583.
authors.forename: A J
authors.initials: AJ
authors.lastname: Foth
authors.affiliation: USDA, Agricultural Research Service, US Meat Animal Research Center, Clay Center, NE 68933.
authors.forename: T
authors.initials: T
authors.lastname: Brown-Brandl
authors.affiliation: Department of Statistics, University of Nebraska-Lincoln, Lincoln 68583.
authors.forename: K J
authors.initials: KJ
authors.lastname: Hanford
authors.affiliation: Department of Animal Science, University of Nebraska-Lincoln, Lincoln 68583.
authors.forename: P S
authors.initials: PS
authors.lastname: Miller
authors.affiliation: Department of Animal Science, University of Nebraska-Lincoln, Lincoln 68583.
authors.forename: G
authors.initials: G
authors.lastname: Garcia Gomez
authors.affiliation: Department of Animal Science, University of Nebraska-Lincoln, Lincoln 68583. Electronic address: pkononoff2@unl.edu.
authors.forename: P J
authors.initials: PJ
authors.lastname: Kononoff
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D002417:Cattle; D004032:Diet / Q000662:veterinary; D002149:Energy Intake; D004734:Energy Metabolism; D005223:Fats / Q000032:analysis; D005260:Female; D007774:Lactation / Q000502:physiology*; D008892:Milk / Q000737:chemistry; D008894:Milk Proteins; D012820:Silage; D013025:Glycine max; D014866:Waste Products; D003313:Zea mays
chemical_list: D005223:Fats; D008894:Milk Proteins; D014866:Waste Products
keywords: dairy cow; energy balance; indirect calorimetry; reduced-fat dried distillers grains with solubles