Effects of maternal nutrition in the final third of gestation on performance and body composition of progeny at slaughter
DOI:
https://doi.org/10.1590/1809-6891v24e-74730EAbstract
This study aimed to assess how maternal nutrition in the final third of gestation affects progeny weight performance and body composition. Forty-one steers were included, born to cows subjected to different nutritional levels during this period: 13 cows without supplementation and under nutritional restriction (RES), 16 cows supplemented to meet 100% of requirements (REQ), and 12 cows supplemented to meet 150% of requirements (HIGH). The study design was completely randomized. Progeny performance was not influenced by maternal nutrition during gestation (P > 0.05). However, RES animals excelled during challenging periods, while REQ and HIGH animals performed better in nutritionally favorable environments. Maternal nutrition in the final third of gestation did not impact the contribution of non-carcass components (16.42%) and internal organs (3.17%). RES and HIGH steers had a higher relative weight of the rumen (2.48%) compared to REQ steers (2.24%), resulting in a greater proportion of the gastrointestinal tract (8.25% vs. 7.63%). Carcass characteristics did not differ significantly between treatments (P > 0.05), with an average hot carcass weight and yield of 304.28 kg and 57.80%, respectively. The primary fore, side, and hind cuts represented 39.22%, 10.64%, and 50.67% of the carcass, respectively. Overall, maternal nutrition during gestation affects fetal development, leading to modifications in body composition and, consequently, the productive potential of the offspring.
Keywords: carcass yield; gastrointestinal tract; slaughter weight; vital organs
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