Fatty acid and triglyceride composition of milk fat from lactating Holstein cows in response to supplemental canola oil
Fatty acid and triglyceride composition of milk fat from lactating Holstein cows in response to supplemental canola oil
复制标题
DOI：
10.3168/jds.s0022-0302(01)74550-x
复制
发表时间：
2001-04-01
影响因子：
3.5
通讯作者：
Perez-Monti, H
中科院分区：
文献类型：
--
作者：
DePeters, EJ;German, JB;Perez-Monti, H
目的是确定膳食脂质对泌乳荷斯坦奶牛乳脂肪的总脂肪酸和sn - 2脂肪酸组成以及甘油三酯结构的影响。5头安装了瘤胃和十二指肠瘘管的初产荷斯坦奶牛采用4×5不完全拉丁方设计。所有奶牛都接受基础日粮。处理包括：不添加补充菜籽油的基础日粮（对照）；在日粮的精料部分添加菜籽油使脂肪含量达到1.6%的基础日粮；直接向瘤胃注入330克菜籽油的基础日粮；直接向皱胃注入330克菜籽油的基础日粮。与对照相比，菜籽油处理降低了乳脂肪中的棕榈酸含量，增加了油酸含量。与对照和皱胃注入相比，当菜籽油可在瘤胃中利用时，硬脂酸含量更高。与其他处理相比，皱胃注入增加了乳脂肪中的亚油酸和亚麻酸含量。sn - 2脂肪酸组成反映了总脂肪酸组成。所有菜籽油处理都降低了sn - 2位置的棕榈酸含量，增加了油酸含量。sn - 2组成的变化反映了酰基转移酶的特异性和底物浓度。以碳数表示的甘油三酯组成因菜籽油而改变。碳数为C50、C52和C54的甘油三酯增加，而C32、C34和C36的甘油三酯减少。
The objective was to determine the influence of dietary lipid on total and sn-2 fatty acid composition and triglyceride structure of milk fat in lactating Holstein cows. Five primiparous Holstein cows surgically fitted with ruminal and duodenal cannulas were used in a 4 X 5 incomplete Latin square. All cows received a basal diet. Treatments consisted of a basal diet with no supplemental canola oil (control), basal diet with canola oil added to the concentrate portion of the diet to provide 1.6% fat, basal diet with 330 g of canola oil infused directly into the rumen, and basal diet with 330 g of canola oil infused directly into the abomasum. Canola oil treatments decreased palmitic acid and increased oleic acid content of milk fat compared with the control. Stearate was higher when canola oil was rumen available compared with control and abomasal infusion. Abomasal infusion increased linoleic and linoleic acids in milk fat compared with the other treatments. The sn-2 fatty acid composition reflected total fatty acid composition. All canola oil treatments reduced palmitic acid and increased oleic acid content at the sn-2 position. Changes in sn-2 composition reflect specificity of the acyl transferases and substrate concentration. Triglyceride composition reported as carbon number was altered by canola oil. Triglycerides in carbon number C50, C52, and C54 were increased while C32, C34, and C36 were decreased.