Body condition score at calving is the single most important trait determining when a cow resumes heat cycles and therefore when she is likely to re-conceive for the next calf crop. However, it is also very important to avoid condition loss between calving and the breeding season to maintain excellent rebreeding performance. Fall calving cows normally are in good body condition when they calve in September and October. Body condition changes from the time the cow calves until she begins the breeding season can also play a significant role in the rebreeding success story. This appears to be most important to those cows that calve in the marginal condition score range of “4” or “5”.