The effects of copper supplementation and breed on milk fatty acid profile Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/th83m217s

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  • An experiment was conducted to determine the effect of dietary copper (Cu) on Cu status and lipid metabolism in Holstein and Jersey cattle. Eight Jersey and8 Holstein cows in mid-lactation were blocked by days in milk (169 ± 37) and assigned at random to one of two diets. Cows received either a control diet (Cu-) which contained a basal level of 8 mg Cu/kg DM or a treatment (Cu+) diet that was supplemented with 16 mg Cu/kg DM from CuSO4 for a total of 24 mg Cu/kg DM. The experimental design was a 2 by 2 factorial arrangement of treatments with breed (Jersey or Holstein) and Cu supplementation (0 or 16 mg Cu/kg DM) as main effects. As expected, DM intake and milk yield were greater for Holsteins and milk fat and protein percentages were greater for Jerseys. C18:0 was lower for both Cu treatment groups. C18:0 is a precursor in the production of conjugated linoleic acid (CLA). On day 90, Cu- cows produced more CIA (C18:2cgtll) than Cu+ cows, and Cu+ cows produced more total saturated fatty acids than Cu- cows.
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