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Short Communication: Canola Meal as a Substitute for Cottonseed Meal in Diet of Midlactation Holsteins

S. M. Maesoomi^*, G. R. Ghorbani^*, M. Alikhani^* and A. Nikkhah^,1

^* Department of Animal Science, Isfahan University of Technology, Isfahan 84156, Iran
Department of Animal Science, University of Manitoba, Winnipeg, MB, Canada R3T 2N2

¹ Corresponding author: umnikkha{at}cc.umanitoba.ca

The growing demand by humans for monounsaturated vegetable oils has provided canola meal (CM) for use in dairy diets because it possesses an excellent nitrogen profile for rumen microbes. Six midlactation cows were used in a replicated 3 x 3 Latin square design with 3 periods of 20 d each. Treatments included diets with 1) CM, 2) 50% CM + 50% cottonseed meal (CSM), and 3) CSM. Total crude protein (CP), nonprotein nitrogen, and rapidly degradable true protein (% of CP) were greater in CM than in CSM. The neutral and acid detergent fibers, slowly degradable true protein, and unavailable CP were lower in CM than in CSM. Daily feeding of 3.4 kg of CM instead of 5.6 kg of CSM enhanced milk percentage of protein and SNF, and improved total tract digestibility of dry matter and CP. Therefore, CM offers an economical substitute for CSM in midlactation diets when commercial access, cost, and quality of CSM are variable.

Key Words: canola meal • cottonseed meal • protein fraction • midlactation cow

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