83 Impacts of Heifer Post-Weaning Intake Classification on Performance Measurements of Lactating and non-Lactating two-, Five- and Eight-Year-old Angus Beef Females

Abstract Data used in these studies were part of another project described by Parsons et al. (2021). These evaluated heifer post-weaning intake classification on performance measurements two-, five- and eight-year-old lactating or non-lactating Angus females. We analyzed production data 57 pregnant, (Study 1) 54 lactating, non-pregnant 2) Heifer was calculated over 80 test days following weaning using GrowSafe units. Heifers categorized based as low (< -0.05 SD from the mean), average (± 0.05 high ( > 0.50 mean) within year. Non-lactating females showed an age effect (P ≤ 0.05) for cow body weight (BW), dry matter (DMI) rate (grams/minute), time spent at feeder (minutes/day). Intake greater cows compared with two-year-old cows, more than two- five-year-old cows. Cow BW significant < 0.001), = 0.03) a tendency age*intake interaction 0.10), older weighing younger Milk expressed kilograms grams per kilogram had 0.001) effect. Two-year-olds classifications milk produced classifications. Additionally, classified intake. In summary, minor impacts three classes beef two different levels.