日粮添加植物油籽对乳脂脂肪酸的影响

 【目的】 研究日粮中添加国内广泛种植的几种植物油籽对中国荷斯坦奶牛乳脂脂肪酸组成影响，为改变牛奶脂肪酸组成，提高乳品质寻找合适的途径。【方法】 选用40头泌乳中期（150±25d）、胎次（3±1胎）的中国荷斯坦奶牛，采用完全随机试验（对照组、全脂整粒大豆组、混合油籽组以及全脂膨化大豆组）设计。试验期6周，牛奶样品于试验第4、5和6周采集，利用气相色谱仪分析样品脂肪酸组成。【结果】与对照组相比，日粮添加膨化大豆后乳脂中共轭亚油酸（CLA）含量提高了83.33%(P<0.05）。全脂整粒大豆组、混合油籽组以及全脂膨化大豆组乳脂中月桂酸（C12﹕0）和豆蔻酸(C14﹕0)含量分别比对照组降低了35.73%和35.51%、38.65%和23.83%、24.85%和31.48%。【结论】日粮添加植物油籽可以改变乳脂脂肪酸组成，增加CLA含量，降低月桂酸（C12﹕0）和豆蔻酸(C14﹕0)含量，从而提高乳品质。

The Effect of Supplementation with Vegetable Oilseed on Fatty Acid Profiles in Milk Fat from Dairy Cows

Object] This study was conducted to research the effects of dietary supplementation with vegetable oilseeds on bovine milk quality. Method] Forty Chinese holstein dairy cows were arranged following treatments ( eg. control, and whole full fat soybean, mix-oilseeds with whole cottonseed and soybean and expand soybean, D expand soybean) with a factor completely randomized block, and what change do the fatty acids improve in bovine milk. Result] CLA percent is the highest in the expand soybean group(P＜0.05). The fatty acids content of high inductive cholesterol disease was decreased with oilseeds supplementation(P＜0.05).Conclusion] Bovine milk quality was improved with oilseed supplementation, and △9-desatuase activity is relative to ratio of c9t11CLA and t11C18:1 than others.