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Journal of Dairy Science Vol. 81 No. 9 2459-2468
© 1998 by American Dairy Science Association ®
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Effect of Added Dietary Fat on Performance, Rumen Characteristics, and Plasma Metabolites of Midlactation Dairy Cows

G. R. Khorasani 1 and J. J. Kennelly 1

1 Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada T6G 2P5

Effects of supplemental Jet-Sploded® canola seed in the diets of dairy cows on milk yield and composition and blood metabolite concentrations were investigated. Twenty multiparous and 5 primiparous midlactation Holstein cows were assigned to treatments following a 3-wk covariate period; cows were then on the treatments for 70 d. Ten of the cows had previously been fitted with rumen cannulas. Five concentrate mixtures containing 0, 7.5, 15, 22, or 29% Jet-Sploded® canola seed (Simons Feed Co., Quimby, IA) (equivalent to 0, 2.66, 5.33, 7.81, and 10.30% added fat, respectively) were formulated by substituting Jet-Sploded® canola seed for barley and canola meal. Diets consisted of 25% alfalfa silage, 25% whole-crop oat silage, and 50% of one of the concentrate mixtures (dry matter basis). An increase in the amount of dietary fat from Jet-Sploded® canola seed did not influence feed intake, milk yield or composition, or milk component yields. The inclusion of Jet-Sploded® canola seed in the diet increased long-chain fatty acids and inhibited de novo synthesis of medium-chain fatty acids in milk. Mean total volatile fatty acids in the rumen and propionate concentration were reduced in a linear fashion by treatment. The inclusion of Jet-Sploded® canola seed in the diets of midlactation cows altered rumen and blood metabolite concentrations; however, these changes had minimal effects on yield responses with the exception of milk fatty acid composition and milk protein content.

Key Words: canola seed • dietary fat • dairy cows

Submitted on September 2, 1997
Accepted on May 9, 1998




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J. L. Leupp, G. P. Lardy, S. A. Soto-Navarro, M. L. Bauer, and J. S. Caton
Effects of canola seed supplementation on intake, digestion, duodenal protein supply, and microbial efficiency in steers fed forage-based diets
J Anim Sci, February 1, 2006; 84(2): 499 - 507.
[Abstract] [Full Text] [PDF]


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Copyright © 1998 by the American Dairy Science Association ®.