See the current Vallejo, CA weather and a 5 day forecast. Also view: monthly average temperatures, precipitation, snow depth, wind speed, air quality and pollution.
For Brahman or Santa Gertrudis crosses (tropical breeds), a medium to high roughage diet may be adequate. For animals raised on the range from weaning to 18 months, a daily live weight gain of 0.3 kg has been reported (Animal production and range research unit 1988) and this will probably decline as the animals mature.
A good rule of thumb is 4% of body weight per head per day of good hay for mature dry cows ( 1st and 2nd trimesters of pregnacy). 4% mature weight per head per day of 50/50 good quality grass/alfalfa in the last trimester of pregnancy and early lactation. Watch their condition and adjust feeding accordingly.