79 Effects of Nutrient Restriction During Late Gestation of the First Parity on cow and Calf Performance During the Second Lactation

Abstract Fall-calving Herford-SimAngus heifers were individually fed either 100% (control; CON, n = 10) or 70% (nutrient restricted; NR, 12) of NASEM metabolizable energy and protein requirements from d 160 gestation to calving. Postpartum cows until 149 lactation, then tall fescue hay pasture as a single group through parity 2. Second cow performance calf size measured at birth, 30, 60 post-calving. Single-quarter colostrum yield was collected pre-suckling. At 30 4-hour milk collected. Data analyzed with the fixed effect first nutritional plane, calving breeding date, sex, sire (calf measures) covariates. Milk included day x treatment (repeated measures). We previously reported that in 1, NR reduced (P ≤ 0.04) yield, weaning weight, dam BCS. From 2, CON had greater 0.008) BCS 0.003) backfat on 30. Additionally, 0.002) BW compared lactation. Calf not affected ≥ 0.17) by plane except cannon length birth tended 0.08) be longer calves. Colostrum volume weight 0.37) plane. 0.001) than 60. These data indicate reserves remained less 2 when experienced late gestational nutrient restriction, but size, unaffected second parity.