Livestock Research Institute, Oita Prefectural Agriculture, Forestry and Fisheries Research Center, Oita, Japan.
Kuju Agricultural Research Center, Kyushu University, Oita, Japan.
Anim Sci J. 2019 Jun;90(6):728-736. doi: 10.1111/asj.13198. Epub 2019 Apr 21.
This study evaluated the effects of rice whole crop silage (RWCS) on growth, plasma levels of vitamin A, β-carotene, vitamin E and IGF-1, and expression of genes involved in muscle protein degradation and synthesis in Japanese Black calves. Eleven calves were divided into RWCS (fed RWCS ad libitum and concentrate, n = 5) and control groups (fed hay ad libitum and concentrate, n = 6). Final body weight and dairy gain were significantly larger in the RWCS group compared with the control group. Plasma β-carotene and vitamin E concentrations were significantly higher in the RWCS group compared with control group. Although plasma vitamin E concentration in the RWCS group significantly increased from 4 to 9 months of age, it did not increase in the control group. At 6 months of age in the RWCS group, ubiquitin B (p < 0.05) and calpain 1 (p = 0.097) mRNA expression were lower than control group, but they were not different between groups at 9 months of age. These results indicate that RWCS increases plasma β-carotene level and promotes muscle growth because of a decrease in the rate of protein degradation, but the effect is lost with the increase in plasma vitamin E level.
本研究评估了全株水稻青贮（RWCS）对日本黑牛 calves 生长、血浆维生素 A、β-胡萝卜素、维生素 E 和 IGF-1 水平以及肌肉蛋白降解和合成相关基因表达的影响。11 头 calves 分为 RWCS 组（自由采食 RWCS 和浓缩饲料，n = 5）和对照组（自由采食干草和浓缩饲料，n = 6）。与对照组相比，RWCS 组 calves 的最终体重和日增重显著更大。与对照组相比，RWCS 组 calves 的血浆 β-胡萝卜素和维生素 E 浓度显著更高。尽管 RWCS 组 calves 的血浆维生素 E 浓度从 4 月龄到 9 月龄显著增加，但对照组 calves 的血浆维生素 E 浓度并未增加。在 RWCS 组 calves 6 月龄时，泛素 B（p < 0.05）和钙蛋白酶 1（p = 0.097）mRNA 表达低于对照组，但在 9 月龄时两组间无差异。这些结果表明，RWCS 通过降低蛋白质降解率来增加血浆 β-胡萝卜素水平并促进肌肉生长，但随着血浆维生素 E 水平的增加，这种作用会消失。
