Influence of nonenzymatically browned soybeans on ruminal fermentation and lactational performance of dairy cows.
Four ruminally fistulated Holstein cows were assigned to one of four total mixed rations (TMR) in a 4 x 4 Latin square with 3-wk periods to investigate the effects of added lipid from nonenzymatically browned soybeans or soybean oil on ruminal metabolism and milk fatty acids. All rations contained 50% forage and 1) 4% added lipid from soybean oil, 2) 4 or 6% added lipid from nonenzymatically browned soybeans, or 3) no added lipid (control). The TMR that contained nonenzymatically browned soybeans increased milk C18:2 by 35% compared with the TMR that contained soybean oil. A lactation trial was conducted in which 60 Holstein cows were assigned to one of five TMR from wk 3 to 18 of lactation. The TMR contained 1) 4.5% added lipid from soybean oil, 2) 1.5% added lipid from nonenzymatically browned soybeans and 3% from soybean oil, 3) 3% added lipid from nonenzymatically browned soybeans and 1.5% from soybean oil, 4) 4.5% added lipid from nonenzymatically browned soybeans, and 5) 4.5% added lipid from Ca salts of long-chain fatty acids. Dry matter intake was reduced by 11% for cows fed the TMR containing soybean oil only compared with that for cows fed the other TMR. Milk C18:2 and C18:3 were increased as the inclusion of nonenzymatically browned soybeans in the TMR increased. All percentages of the nonenzymatically browned soybeans fed to cows resulted in fat-corrected milk yields that were similar to those of cows fed the TMR that contained Ca salts of fatty acids.
Abel-Caines
S F
SF
Department of Animal Science, University of Nebraska, Lincoln 68583-0908, USA.
Grant
R J
RJ
Klopfenstein
T J
TJ
Winowiski
T
T
Barney
N
N
D000818:Animals; D002417:Cattle / Q000502:physiology*; D004041:Dietary Fats / Q000008:administration & dosage*; D004043:Dietary Fiber / Q000378:metabolism; D004063:Digestion; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005260:Female; D005285:Fermentation; D005511:Food Handling; D006863:Hydrogen-Ion Concentration; D007774:Lactation / Q000502:physiology*; D008055:Lipids / Q000032:analysis; D008892:Milk / Q000737:chemistry; D008894:Milk Proteins / Q000032:analysis; D012417:Rumen / Q000378:metabolism*; D013024:Soybean Oil / Q000008:administration & dosage; D013025:Glycine max
D004041:Dietary Fats; D004043:Dietary Fiber; D005232:Fatty Acids, Volatile; D008055:Lipids; D008894:Milk Proteins; D013024:Soybean Oil