The objective of this study is to evaluate if Omnigen-AF® supplementation influences somatic cell count (SCC) and microbiologic culture in early lactation dairy cows. Forty multiparous crossbred Holstein/Gir pregnant non-lactating cows will be classified according to body weight (BW) and body condiiton score (BCS) 30 days previous to the expected calving date and assingned to one of two treatments: 1)diet formulated to meet maintenance and lactation requirements with Omnigen-AF® supplementation (56g/animal/day); or 2) diet formulated to meet maintenance and lactation requirements with caolin (ruminal inert product) supplementation (56g/animal/day). Animals will be kept in drylot pens with natural shade and ad libitum water and corn silage. Concentrate and supplementation (Omnigen-AF® or caolin) will be fed individually in headlock system during all the experimental period. BW will be recorded weekly and BCS every fifteen days. Milk production will be recorded daily for each animal and a milk sample will be collected for SCC and composition. Every fifteen days a individual milk sample will be collected for microbiologic culture. Data will be analyzed using SAS MIXED procedure.
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