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首页> 外文期刊>Small Ruminant Research >Dairy performance and milk fatty acid composition of dairy goats fed high or low concentrate diet in combination with soybeans or canola seed supplementation
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Dairy performance and milk fatty acid composition of dairy goats fed high or low concentrate diet in combination with soybeans or canola seed supplementation

机译：高浓缩饲料或低浓缩饲料配合大豆或低芥酸菜籽添加的奶山羊的乳性能和乳脂肪酸组成

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The objective of this trial was to study the effects of diets with low (L, 45% diet DM) or high (H, 65% diet DM) percentage of concentrate combined with the addition of extruded soybeans (SB) or rolled canola seeds (CS) on the performance of dairy goats and milk fatty acid (FA) composition. Twenty-four Saanen or Alpine goats were used in an 8 wk trial with the first 2 wk for the adaptation to one of the 4 experimental diets (L-SB, L-CS, H-SB, H-CS) accordingly to a 2 x 2 factorial arrangement. Individual milk production and gross composition were recorded weekly and milk FA was analyzed in the middle and at the end of the trial. The dry matter intake was similar among groups, but total FA intake was higher in H-CS group. The dietary treatments did not affect the milk yield (kg/d), the contents (g/kg) and yields (g/d) of fat and protein, the yield of lactose and the content of urea; however feeding H-CS diet increased the content of lactose. The dietary treatments did not affect the proportion of FA from C4:0 to C10:0 in milk fat. Feeding H rations increased the percentage of trans-C18:1 (t6 + 7 + 8 and t9 to t12-C18:1), c9,c12-C18:2 and c9,t11-C18:2 at the expense of C14:0, c9,c12,c15-C18:3 and the iso and ante-iso FA. Feeding CS increased the C18:0 and total trans-C18:1 whereas SB raised the C16:0 and c9,c12-C18:2. The milk from H-CS group was the richest in trans FA, but the extent of the response of the trans FA was slightly different according to the isomer: it was higher for t6 + 7 + 8-C18:1 than for t11-C18:1. Feeding high concentrate diets combined with dietary fat can be used to modify the FA profile of goat milk, without any negative effect on milk yield and milk fat or protein contents. Their effects may be complementary, at least for trans-FA. Moreover, the profile of trans isomers relative to total trans-C18:1 seems dependent on the source of dietary fat
机译：该试验的目的是研究低（L，45％日粮DM）或高（H，65％日粮DM）精矿配合添加膨化大豆（SB）或低芥酸菜籽种子（ CS）对乳山羊性能和牛奶脂肪酸（FA）的组成。在8周的试验中，使用了24只Saanen或Alpine山羊，其中前2周适应了4种实验饮食（L-SB，L-CS，H-SB，H-CS）中的一种。 x 2析因排列。每周记录单个奶的产量和总成分，并在试验的中期和结束时对牛奶FA进行分析。各组之间的干物质摄入量相似，但H-CS组的总FA摄入量较高。饮食处理不会影响牛奶的产量（kg / d），脂肪和蛋白质的含量（g / kg）和产量（g / d），乳糖的产量和尿素的含量。然而，喂养H-CS饮食会增加乳糖含量。饮食处理不影响乳脂中FA从C4：0到C10：0的比例。喂食H粮增加了反式C18：1（t6 + 7 + 8和t9至t12-C18：1），c9，c12-C18：2和c9，t11-C18：2的百分比，但以C14：0为代价，c9，c12，c15-C18：3以及iso和aniso-iso FA。进料CS提高了C18：0和总反式C18：1，而SB提高了C16：0和c9，c12-C18：2。 H-CS组的牛奶中反式FA含量最高，但是根据异构体，反式FA的反应程度略有不同：t6 + 7 + 8-C18：1的含量高于t11-C18 ：1。饲喂高浓缩日粮和膳食脂肪可以用来改变山羊奶的FA谱，而不会对牛奶产量，乳脂或蛋白质含量产生任何负面影响。它们的作用可能是互补的，至少对于反式FA而言。此外，反式异构体相对于总反式C18：1的分布似乎取决于膳食脂肪的来源

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