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• W3205967486 abstract "Abstract To determine the effects of late gestational nutrient restriction (NR) on heifer performance, fetal growth, and calving difficulty, single-sired fall-calving Hereford-SimAngus heifers (BW: 451 ± 28 [SD] kg; BCS: 5.4 ± 0.7) bred to a single sire were allocated by fetal sex and expected calving date to either 100% (control; CON; n = 12) or 70% (n = 13) of NASEM net energy and metabolizable protein requirements for maintenance, pregnancy, and growth. Beginning on d 160 of gestation, heifers were individually fed chopped sorghum sudan hay (1.74 Mcal ME, 6.66% CP, 72.0% NDF; DM basis) and based on individual intakes, supplemented to meet targeted nutritional planes. Dam BW, BCS, and backfat (BF) were determined pre-treatment, every 21 d (BW) or 42 d (BCS and BF) during treatments, and post-calving. At birth, calf BW and size (length, heart girth, abdominal girth, flank girth, cannon circumference, cannon length, shoulder height, and ribeye area) were measured. Data were analyzed with treatment, treatment initiation date, and calf sex (when P &lt; 0.25) as fixed effects. Dam BW tended to be less (P = 0.09) and BCS was less (P = 0.04) at d 202 of gestation for NR dams. Dam BW, BCS, and BF were less (P ≤ 0.01) in NR dams for the remainder of gestation. Post-calving, NR dams weighed 64 kg less (P ≤ 0.01) than CON, with a BCS of 3.6 ± 0.1. Nutrient restriction did not affect (P ≥ 0.27) calf gestation length, BW, or size. Calf BW as % post-calving dam BW tended to be greater (P = 0.09) for NR calves. Fetal presentation was normal for all CON births, while 23.1% of NR dams had fetal malpresentation (P = 0.12). In the current study, NR dam BW and BCS were sacrificed during late gestation without altering fetal growth trajectory." @default.
• W3205967486 created "2021-10-25" @default.
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• W3205967486 date "2021-10-08" @default.
• W3205967486 modified "2023-10-16" @default.
• W3205967486 title "342 Effects of Maternal Nutrient Restriction During Late Gestation on Primiparous Dam Performance and Fetal Growth" @default.
• W3205967486 doi "https://doi.org/10.1093/jas/skab235.343" @default.
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