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Breed and Lactation Stage Alter the Rumen Protozoal Fatty Acid Profiles and Community Structures in Primiparous Dairy Cattle

Cersosimo, Laura M., Bainbridge, Melissa L., Wright, Andre-Denis G., Kraft, Jana
Journal of agricultural and food chemistry 2016 v.64 no.9 pp. 2021-2029
Entodinium, Holstein, Jersey, Protozoa, community structure, conjugated linoleic acid, cows, crossbreds, dairy cattle, digesta, fatty acid composition, lactation stage, milk, nutrition, oleic acid, rumen, rumen protozoa
The protozoal fatty acid (FA) composition and community structure are important to dairy cattle nutrition and their products. The purpose of the study was to observe if the rumen protozoal FA profiles and protozoal community structure differed by breed and lactation stage. At 93, 183, and 273 days in milk (DIM), whole rumen digesta samples were collected from seven co-housed Holstein (H), eight Jersey (J), and seven Holstein–Jersey crossbreed (C) cows. Rumen protozoal linoleic acid was higher at 183 DIM (8.1%) and 273 DIM (8.3%) than at 93 DIM (5.7%). Oleic acid was the most abundant protozoal unsaturated FA (10.1%). Protozoal rumenic acid and protozoa of the genus Metadinium were higher in J (9.9%) than in H (0.52%) and C (0.96%). Protozoa belonging to the genus Entodinium were more abundant in H (45.2%) than in J (23.4%) and C (30.2%). In conclusion, breed and DIM affected several protozoal FAs and genera.