Moreover, an additional 100 pounds is typically gained during the last trimester of gestation for fetal growth and uterine development. Table 3 shows body condition scores and weight change recommendations for cows achieving a desired BCS of 5-7 90 to 100 days before calving. This is the critical time when the producer has the ability to put condition back on a 'thin' cow or restrict feed intake of a 'fat' cow.