transition period

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Udder health of dairy cows with an extended voluntary waiting period from calving until the first insemination.
Feeding rumen-protected methionine during the peripartum period improved milk fat content and reduced the culling rate of Holstein cows in a commercial herd
Effects of replacing inorganic salts of trace minerals with organic trace minerals in pre- and postpartum diets on feeding behaviour, rumen fermentation, and performance of dairy cows.