Author
SAN EMETERIO, FRANCISCO - UNIV OF WISCONSIN-MADISON | |
REIS, R - UNIV OF WISCONSIN-MADISON | |
Satter, Larry | |
COMBS, DAVID - UNIV OF WISCONSIN-MADISON |
Submitted to: Journal Dairy Science Supplement
Publication Type: Abstract Only Publication Acceptance Date: 6/25/1997 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: The experiment was conducted to evaluate the effect of physical form of corn on ruminal fermentation, milk production and composition. Nine ruminal cannulated cows were arranged in a 3 X 3 Latin square design replicated three times. The treatments were dry shelled corn coarsely ground (mean particle size 1.25 mm) (DC); high moisture ear corn coarsely ground (mean particle size 3.14 mm) (HC); and high moisture ear corn finely ground (mea particle size 2.22 mm) (HF). Cows were fed ad lib 4 times daily with fresh chopped grass-legume forage and 10 kg DM/d of corn based concentrate. Periods were 15 days with the last 6 days for sampling and parameter evaluation. Ruminal pH was not affected by the form of corn, but treatment HC had higher ruminal ammonia and total amino acid (TAA) concentrations (P < .05). Milk production and composition did not differ among treatments, though milk yield and 3.5% FCM trended higher for DC. Microbial protein synthesis in the rumen as estimated by blood allantoin concentration was not affected by treatment. Fine grinding improved overall starch digestibility (P < .001). |