The effect of feeding canola meal on concentrations of plasma amino acids.
An initial meta-analysis on isonitrogenous experiments where a protein source was replaced by canola meal (CM) showed that CM feeding increased yields of milk and milk protein and apparent N efficiency. The objective of the current study was to determine if these responses were related to increased changes in plasma AA concentrations. Although only half of the experiments of the initial meta-analysis reported concentrations of plasma AA and could be used in the current meta-analysis, lactational responses to CM feeding were similar to those reported previously. In the current meta-analysis, CM feeding increased plasma concentrations of total AA, total essential AA (EAA) and all individual EAA, but decreased concentrations of blood and milk urea-N. The current meta-analysis suggests that CM feeding increased the absorption of EAA, which would be responsible for the increased milk protein secretion and the increased apparent N efficiency.
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada J1M 0C8.
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Martineau
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada J1M 0C8.
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Ouellet
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada J1M 0C8. Electronic address: Helene.Lapierre@agr.gc.ca.
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Lapierre
D000596:Amino Acids / Q000097:blood*; D000601:Amino Acids, Essential / Q000097:blood; D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D029688:Brassica napus / Q000737:chemistry*; D029741:Brassica rapa / Q000737:chemistry*; D002417:Cattle / Q000097:blood / Q000502:physiology*; D004032:Diet; D004044:Dietary Proteins / Q000008:administration & dosage / Q000378:metabolism; D007774:Lactation; D008892:Milk / Q000378:metabolism; D008894:Milk Proteins / Q000378:metabolism; D009149:Mustard Plant / Q000737:chemistry*
D000596:Amino Acids; D000601:Amino Acids, Essential; D004044:Dietary Proteins; D008894:Milk Proteins
amino acid; blood urea-N; canola meal; metabolizable protein