背景:第一次怀孕的后半期是乳腺生长发育的关键时期。在此期间使用功能化合物可能会对家畜的生产性能产生积极影响。
目的:在本研究中,分析了Saanen山羊乳腺中脂肪生成酶基因表达对不同饮食脂肪来源的反应。
方法:来自四组(每组10只)的山羊从怀孕的最后两个月到哺乳的四个月接受这些饮食:C-,不添加脂肪(阴性对照组),C+,饱和棕榈油(阳性对照组),SB,用烤大豆(omega-6组)和FS,与挤压亚麻籽(omega-3组)。脂肪含量为干物质的约4%。牛奶产量,牛奶脂肪酸简介,测定乳腺组织中4种脂肪生成酶的基因表达和牛奶健康指数(HI)。
结果:FS组的产奶量明显较高,ω-6至ω-3较低,单不饱和至多不饱和,和总饱和脂肪酸与其他组相比。总乳脂肪酸的16碳链较短和较长,表明C-和C+基团的值明显较高,分别。SB组的奶HI显著较高。乙酰辅酶A羧化酶的基因表达谱在C-组中高于其他实验组。
结论:结果表明,用不饱和脂肪补充剂控制饮食可以改善产奶量,初产Saanen山羊乳腺组织中乳脂的合成和脂肪生成酶的分子表达。
The second half of the first pregnancy is a critical period in the growth and development of the mammary gland. The use of functional compounds during this period may positively impact livestock performance.
In this study, changes in lipogenic enzyme gene expression in the mammary gland of Saanen goats in response to different dietary fat sources were analysed.
Goats from four groups (10 each) received these diets from the last two months of pregnancy through four months of lactation: C-, no added fat (negative control group), C+, with saturated palm oil (positive control group), SB, with roasted soybeans (omega-6 group) and FS, with extruded flaxseed (omega-3 group). The fat content was about 4% of dry matter. Milk yield, milk fatty acid profile, milk health index (HI) and gene expression of four lipogenic enzymes in mammary tissue were measured.
The FS group had significantly higher milk production with lower omega-6 to omega-3, monounsaturated to polyunsaturated, and total saturated fatty acids compared to other groups. The shorter and longer than16-carbon chain of total milk fatty acid indicates significantly higher values for the C- and C+ groups, respectively. The milk HI for the SB group was significantly higher. The gene expression profile for acetyl-coenzyme A carboxylase was higher in the C- group than other experimental groups.
The results show that manipulation of the diet with unsaturated fat supplements improved milk production, synthesis of milk fat and molecular expression of lipogenic enzymes in mammary tissue in primiparous Saanen goats.