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首页> 外文期刊>Asian-Australasian Journal of Animal Sciences >Effect of supplementation of fish and canola oil in the diet on milk fatty acid composition in early lactating Holstein cows.
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Effect of supplementation of fish and canola oil in the diet on milk fatty acid composition in early lactating Holstein cows.

机译：日粮中添加鱼油和低芥酸菜子油对早期泌乳荷斯坦奶牛的牛奶脂肪酸组成的影响。

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This study examined the effects of supplementation of fish oil and canola oil in the diet on milk yield, milk components and fatty acid composition of Holstein dairy cows in early lactation. Eight multiparous early lactation Holstein cows (42+or-12 DIM, 40+or-6 kg daily milk yield) were fed a total mixed ration supplemented with either 0% oil (Control), 2% fish oil (FO), 1% canola oil +1% fish oil (FOCO), or 2% canola oil (CO) according to a double 4x4 Latin square design. Each period lasted 3 wk; experimental analyses were restricted to the last week of each period. Supplemental oils were added to a basal diet which was formulated according to NRC (2001) and consisted of 20% alfalfa, 20% corn silage and 60% concentrate. Milk yield was similar between diets (p>0.05), but dry matter intake (DMI) was lower (p<0.05) in cows fed FO diet compared to other diets. Milk fat percentage and daily yield decreased (p<0.01) with the supplementation of fish and canola oil. The daily yield and percentage of milk protein, lactose and solids-not-fat (SNF) were not affected by diets (p>0.05). The proportion (g/100 g fatty acids) of short chain fatty acids (SCFA) decreased and polyunsaturated fatty acids (PUFA) increased (p<0.05) in milk of all cows fed diets supplemented with oil. The proportions of 6:0, 8:0, 10:0 12:0 and 14:0 fatty acids in milk fat decreased (p<0.01) for all diets supplemented with oil, but the proportions of 14:1, 16:0 and 16:1 fatty acids were not affected by diets (p>0.05). The proportion of trans(t)-18:1 increased (p<0.01) in milk fat of cows fed FO and FOCO diets, but CO diet had the highest proportion of cis(c)-11 18:1 (p<0.01). The concentration of t-10, c-12 18:2, c-9 t-11 18:2, 18:3, eicosapentaenoic acid (EPA, 20:5) and docosahexaenoic acid (DHA, 22:6) increased (p<0.05) in FO and FOCO diets in comparison with the other two diets. These data indicate that including fish oil in combination with canola oil significantly modifies the fatty acid composition of milk.
机译：这项研究检查了日粮中补充鱼油和低芥酸菜籽油对荷斯坦奶牛早期泌乳的产奶量，牛奶成分和脂肪酸组成的影响。给八头早产多头荷斯坦奶牛（42 +或-12 DIM，每天产奶量40 +或-6 kg）喂食全混合日粮，补充0％油（对照组），2％鱼油（FO），1％根据双4x4拉丁方形设计，低芥酸菜籽油+ 1％鱼油（FOCO）或2％低芥酸菜子油（CO）。每个时期持续3周;实验分析仅限于每个时期的最后一周。将补充油添加到根据NRC（2001）配制的基础日粮中，该基础油由20％的苜蓿，20％的玉米青贮饲料和60％的精矿组成。两种日粮之间的产奶量相似（p> 0.05），但与其他日粮相比，以FO日粮喂养的奶牛的干物质摄入量（DMI）较低（p <0.05）。补充鱼油和低芥酸菜籽油可降低乳脂率和日产量（p <0.01）。饮食不影响牛奶蛋白，乳糖和非脂肪固体的日产量和百分比（p> 0.05）。在所有补充了油脂的奶牛的牛奶中，短链脂肪酸（SCFA）的比例（g / 100 g脂肪酸）降低，多不饱和脂肪酸（PUFA）升高（p <0.05）。在所有添加油脂的饮食中，乳脂中脂肪酸的6：0、8：0、10：0 12：0和14：0的比例均降低（p <0.01），但比例为14：1、16：0和16：1脂肪酸不受饮食的影响（p> 0.05）。饲喂FO和FOCO日粮的母牛的乳脂中 trans（t） -18：1的比例增加（p <0.01），但是CO饮食中顺式（c）的比例最高 -11 18：1（p <0.01）。 t -10， c -12 18：2， c -9 t -11 18： 2、18：3，FO和FOCO日粮中二十碳五烯酸（EPA，20：5）和二十二碳六烯酸（DHA，22：6）与其他两种日粮相比增加（p <0.05）。这些数据表明，将鱼油与低芥酸菜子油结合使用可显着改变牛奶的脂肪酸组成。

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