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It all depends on how big she is, how much milk she is producing, what stage of lactation she is in, what body condition she's in (fat, thin, or moderate), breed, age, and nutritional quality of the grass (as determined by growth stage and species that make up the pasture fodder). For this question, we can only use an example.

Say we have a 1200 lb Angus cow in her 3rd month of lactation and she's consuming around 4% of her bodyweight in dry-matter forage (in this case, grass) per day. This calculates out to this cow eating around 48 pounds (1200 x 0.04) of dry-matter forage per day. For as-fed, let's assume that the grass is good quality and at 65% moisture. This means that she is expected to eat around 6% of her bodyweight per day, or 72 pounds of grass per day.

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10y ago

What else can I help you with?