Department of Animal Science, Universidade Federal de Lavras, Lavras, Minas Gerais 37200-900, Brazil.
Department of Animal Production, Universidade Estadual Paulista, Botucatu, São Paulo 18610-307, Brazil.
Meat Sci. 2022 Feb;184:108676. doi: 10.1016/j.meatsci.2021.108676. Epub 2021 Sep 17.
This study aimed to evaluate intramuscular fat and expression of genes in the muscle of Montana × Nellore treated with vitamin A at birth. We hypothesized that an injection of vitamin A after birth would increase marbling by increasing the expression of angiogenic, adipogenic, and lipogenic genes. Animals treated with vitamin A had greater marbling in the longissimus muscle (P = 0.05). The vitamin A treatment increased the expression of VEGFA gene at 40 days of age and at weaning and increased the expression of ZNF423 at weaning and at harvesting (P ≤ 0.03). The expression of WNT was higher (P = 0.01) at 40 days of age and at weaning in the animals treated with vitamin A. Vitamin A also increased the expression of SREBF1 at 40 days of age and at weaning (P ≤ 0.05). Therefore, the administration of vitamin A to cattle at birth could be a way to increase carcass marbling without affecting the performance of the animals.
本研究旨在评估蒙塔纳牛×内罗尔牛在出生时接受维生素 A 治疗后的肌内脂肪和肌肉基因表达。我们假设出生后注射维生素 A 会通过增加血管生成、脂肪生成和脂生成基因的表达来增加大理石花纹。接受维生素 A 治疗的动物具有更大的背最长肌大理石花纹（P=0.05）。维生素 A 处理在 40 天和断奶时增加了 VEGFA 基因的表达，并在断奶和收获时增加了 ZNF423 的表达（P≤0.03）。在接受维生素 A 处理的动物中，WNT 的表达在 40 天和断奶时更高（P=0.01）。维生素 A 还增加了 SREBF1 在 40 天和断奶时的表达（P≤0.05）。因此，在出生时向牛注射维生素 A 可能是一种增加胴体大理石花纹的方法，而不会影响动物的性能。
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