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首页> 外文期刊>Animal Feed Science and Technology >Milk production and composition, milk fatty acid profile, and blood composition of dairy cows fed whole or ground flaxseed in the first half of lactation
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Milk production and composition, milk fatty acid profile, and blood composition of dairy cows fed whole or ground flaxseed in the first half of lactation

机译：泌乳前半部分全脂或磨碎亚麻籽喂养的奶牛的产奶量和成分，乳脂脂肪酸谱和血液成分

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A total of 27 multiparous Holstein cows averaging 634 kg body weight (BW) were allotted at calving to six groups of four cows and one group of three cows blocked for similar calving dates to determine effects of feeding whole or ground flaxseed on dry matter (DM) intake, milk production, milk composition, milk fatty acid profile and concentration of some blood metabolites. Cows within each block were assigned to one of four iso-net energy for lactation total mixed rations containing either 21 g/kg DM calcium salts of palm oil (control diet), 72 g/kg DM whole flaxseed, 72 g/kg DM ground flaxseed or 36 g/kg DM whole flaxseed and 36 g/kg DM ground flaxseed. Diets were fed for ad libitum intake from calving to week 28 of lactation. Flaxseed grinding and supplementation had no effect on BW and milk production, but intake of DM was lower for cows fed 72 g/kg DM ground flaxseed. The main difference in milk fatty acid profile determined on week 8 of lactation due to flax grinding was for linolenic acid proportion, which was higher in milk fat of cows fed ground (36 or 72 g/kg DM) flaxseed compared to cows fed 72 g/kg DM whole flaxseed. Flaxseed supplementation enhanced the linolenic acid proportion in milk fat compared to the control diet. Cows fed the control diet had higher proportions of 16:0 and cis7-16:1, and lower proportions of 18:0 and cis9-18:1, in milk fat than those fed flaxseed. Cows fed ground flaxseed tended (P=0.07) to have higher plasma concentrations of beta-hydroxybutyrate (BHBA) than those fed the other diets. Compared to diets containing 21 g/kg DM calcium salts of palm oil, 72 g/kg DM whole flaxseed or a mixture of 36 g/kg DM ground and 36 g/kg DM whole flaxseed, feeding 72 g/kg DM ground flaxseed may contribute to increased lipolysis of early lactation cows, as indicated by lower DM intake and higher BHBA concentrations in blood. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
机译：在产犊时，将总共27头平均体重为634公斤（BW）的荷斯坦奶牛分配给六组的四头母牛和一组三头的母牛以类似的产犊日期来确定饲喂整个或地面亚麻籽对干物质的影响（DM ）摄入量，牛奶产量，牛奶成分，牛奶脂肪酸谱和某些血液代谢产物的浓度。将每个区块内的母牛分配给四个等量净能量之一，以进行泌乳总混合日粮，其中包括21 g / kg DM棕榈油钙盐（对照日粮），72 g / kg DM全亚麻籽，72 g / kg DM地面亚麻籽或36 g / kg DM整体亚麻籽和36 g / kg DM地面亚麻籽。从产犊到哺乳第28周，饮食可以随意摄入。亚麻籽粉的研磨和添加对体重和牛奶产量没有影响，但饲喂72 g / kg DM研磨亚麻籽的母牛的DM摄入量较低。在哺乳第8周，由于亚麻研磨而导致的牛奶脂肪酸谱的主要差异在于亚麻酸的比例，以亚麻籽饲喂（36或72 g / kg DM）亚麻籽的母牛的牛奶脂肪高于以72 g饲喂的母牛。 / kg DM整个亚麻籽。与对照饮食相比，添加亚麻籽可增加乳脂中亚麻酸的比例。与饲喂亚麻籽的奶牛相比，饲喂对照饮食的奶牛的乳脂比例更高：16：0和cis7-16：1，比例较低：18：0和cis9-18：1。饲喂磨碎亚麻籽的母牛比其他饮食饲喂的母牛血浆中的β-羟基丁酸酯（BHBA）浓度更高。与含21 g / kg DM棕榈油钙盐的日粮相比，可以饲喂72 g / kg DM整个亚麻籽或36 g / kg DM研磨过的亚麻籽和36 g / kg DM整个亚麻籽的混合物，而饲喂72 g / kg DM干燥亚麻籽较低的DM摄入量和较高的血液中BHBA浓度表明，这有助于增加早期泌乳母牛的脂解作用。官方版权（C）2010，Elsevier B.V.保留所有权利。

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