Milk yield and composition during abomasal infusion of conjugated linoleic acids in dairy cows
Milk yield and composition during abomasal infusion of conjugated linoleic acids in dairy cows
复制标题
DOI：
10.3168/jds.s0022-0302(99)75530-x
复制
发表时间：
1999-12-01
影响因子：
3.5
通讯作者：
Bauman, DE
中科院分区：
文献类型：
--
作者：
Chouinard, PY;Corneau, L;Bauman, DE
共轭亚油酸是指具有共轭双键的亚油酸的位置和几何异构体的混合物。将3种异构体富集程度不同的共轭亚油酸添加剂注入泌乳奶牛皱胃，以测定瘤胃后对产奶量和乳成分的影响。4头荷斯坦奶牛采用4 × 4拉丁方设计。试验组：1）对照组，5 kg脱脂牛奶，（共轭亚油酸补充剂的载体），2）共轭亚油酸补充剂1（28.8 g/d; 6.9 g顺式/反式9，11; 6.4 g顺式/反式8，10），3）共辄亚油酸补充剂2（48.5 g/d; 7.1 g顺式/反式9，11; 4.1 g顺式/反式8，10; 8.3 g顺式/反式10，12; 5.5 g顺式/反式11，13），和4）共轭亚油酸补充剂3（16.3 g/d; 7.1 g顺式/反式9，11; 7.2 g顺式/反式10，12）。输注增加了共轭亚油酸含量的牛奶脂肪从0.43克/100克脂肪的对照治疗的1.02，1.52和0.95克/100克脂肪的共轭亚油酸补充剂1，2和3，分别。顺/反8，10，顺/反9，11，顺/反10，12，顺/反11，13的乳脂转移率分别为25.2，33.5，21.0，28.4%。输注共轭亚油酸对干物质摄入量、产奶量和乳蛋白含量没有影响。然而，共轭亚油酸补充剂分别使乳脂的含量和产量降低了28%和25%。不同的共轭亚油酸补充剂的反应的相似性并不允许我们确定不同异构体的具体作用，但牛奶脂肪酸组成的变化表明，影响主要是从头脂肪酸合成和去饱和过程。
Conjugated linoleic acids refer to a mixture of positional and geometric isomers of linoleic acid with conjugated double bounds. Three supplements of conjugated linoleic acids which differed in isomer enrichment were infused into the abomasum of lactating dairy cows to determine postruminal effect on milk yield and composition. Four Holstein cows were used in a 4 x 4 Latin square design. Treatments were 3-d abomasal infusion of 1) control, 5 kg of skim milk (carrier for conjugated linoleic acid supplements), 2) conjugated linoleic acid supplement 1 (28.8 g/d; 6.9 g of cis/trans 9,11; 6.4 g of cis/trans 8,10), 3) conjugated linoleic acid supplement 2 (48.5 g/d; 7.1 g of cis/trans 9,11; 4.1 g of cis/trans 8,10; 8.3 g of cis/trans 10,12; 5.5 g of cis/trans 11,13), and 4) conjugated linoleic acid supplement 3 (16.3 g/d; 7.1 g of cis/trans 9,11; 7.2 g of cis/trans 10,12). Infusions increased the conjugated linoleic acids content of milk fat from 0.43 g/100 g of fat for the control treatment to 1.02, 1.52, and 0.95 g/100 g of fat for conjugated linoleic acid supplements 1, 2, and 3, respectively. Apparent efficiency of transfer in milk fat was 25.2, 33.5, 21.0, and 28.4% for cis/trans 8,10, cis/trans 9,11, cis/trans 10,12, and cis/trans 11,13, respectively. Infusion of conjugated linoleic acids had no effect on dry matter intake, milk yield, and milk protein content. However, conjugated linoleic acid supplements reduced the content and yield of milk fat by 28 and 25%, respectively. The similarity of response for the different conjugated linoleic acid supplements did not allow us to identify the specific role of different isomers, but the changes in milk fatty acid composition indicated that effects were primarily on de novo fatty acid synthesis and the desaturation process.