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Effects of Mid-Gestation Nutrient Restriction on Carcass Measurements and Meat Quality of Resultant Offspring

The goal of this study was to investigate feedlot performance and meat quality of calves born to cows that underwent a nutrient restriction during the second trimester of gestation which may be occurring in the Intermountain West. Thirty-four angus influenced calves from the same sire were used for this study. The calves were born from cows that were separated into either a maintenance group, and kept on an irrigated pasture, or a restricted group, that was placed on an unirrigated pasture and allowed to lose one body condition score during the second trimester of pregnancy. This study begins with the calves on day 85 of the finishing portion of the feedlot phase. During the finishing feedlot phase, calves were individually housed, fed ad libitum, and feedlot performance measurements were taken every 28 days. Carcasses from the calves were evaluated for yield and quality. A loin from each carcass was collected, aged, frozen, and cut into individually packaged steaks that were used to assess meat quality. There was no difference in feedlot performance and carcass measurements for either maintenance and restricted calves. Meat quality measurements revealed no difference in color, instrumental tenderness values, or composition of steaks from either group. A trained sensory panel found that ten characteristics of flavor were similar for both treatments. There was however, a trend for steaks from nutrient restricted cattle to have more of a bloody/serumy flavor. The trained sensory panel also found that there was a difference in tenderness of steaks from nutrient restricted animals being perceived as more tender than animals from maintenance cows. The results of this study demonstrate that nutrient restriction during mid-gestation does not have negative effects on feedlot performance, carcass characteristics, or meat quality measurements. These results also indicate that steaks from calves born to nutrient restricted cows may be perceived as more tender

0775 Effects of Maternal Dietary Restriction During the Second Trimester on Offspring Growth and Feedlot Performance

This study determined the impacts of maternal dietary insult during the second trimester on offspring growth and early feedlot performance. Angus-influenced commercial cows (n = 34) were naturally bred to a purebred Angus sire. During preparturition, individual cow served as the experimental unit for one-way ANOVA. During 84 d of mid gestation, cows were stratified into two groups, maintenance (n = 16) and restricted (n = 18), by initial weights (P = 0.804) and BCS (P = 0.723). Restricted cows were provided with lower forage biomass (1,662 kg/ha, DM) in comparison with maintenance (2,309 kg/ha, DM). Following the insult period, restricted cows had a mean BCS 1.55 lower (P = 0.001) than maintenance cows and a BW difference of 85.3 kg (P = 0.024). Dams were commingled and uniformly managed following mid gestation. Calves were weaned approximately 215 d of age and placed on a background diet for 7 wks before entering the feedlot phase where calves were kept in individual pens and fed a grower ration ad libitum. Calves BW were measured at birth, weaning, and every 28 d of the feedlot phase. Ultrasound was used for measurement of BF and REA during the feedlot phase. Calf temperament was evaluated at weaning and during the feedlot phase. Serum glucose, insulin, IGF-1, and cortisol were determined for calves at weaning, 1 wk before the feedlot phase, and the last day of the feeding trial. One-way ANOVA was used to determine impacts of fetal programming on calves. Individual calf served as the experimental unit. Calf BW at birth, weaning, and during feeding showed no differences (P ≥ 0.245). No differences were determined for ADFI (P ≥ 0.428), ADG (P ≥ 0.338), G:F (P ≥ 0.273), REA (P ≥ 0.285), or BF (P ≥ 0.416) during the feedlot stage. Concentrations of glucose (P ≥ 0.504), insulin (P ≥ 0.224), IGF-1 (P ≥ 0.107), and cortisol (P ≥ 0.709) were found to be similar at all time points. Restricted calves were found to be more excitable, with greater temperament scores at weaning (P = 0.026). Recent work has indicated that fetal programming alters progeny carcass characteristics. However, concerns for negative impacts on performance of progeny exist. This study determined little impact on calf performance during early feedlot stages