棕榈酸和硬脂酸共混物对预成型脂肪酸转化为乳脂的影响,采用18 C n-3脂肪酸摄动模型。

IF 4.4 1区 农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Y A Adeniji, S L Burtnett, M I Ibrahim, K J Harvatine
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引用次数: 0

摘要

膳食脂肪酸(FA)向乳脂的转移是可变的,据报道,低脂饮食的脂肪酸转移量更高,这可能是一种支持乳脂生产的同质性适应。本研究的目的是利用基于皱胃输注n-3 FA的微扰模型,确定增加饲料脂肪对预成型FA向乳脂转移动力学的影响。选取8头瘤胃插管的多产荷斯坦奶牛(115±32 DIM,产奶量41.5±4.43 kg, mean±SD),分3个21 d期进行切换设计。试验采用低脂基础饲粮(CON)和在基础饲粮中添加棕榈脂和硬脂脂肪酸的混合物,饲粮中添加2% DM(脂肪:33.5% 16:0,53.1% 18.0和6.2% 18:1n-9)。饲粮中添加FA可提高产奶量2.2 kg/d,提高乳脂产量170 g/d。牛奶中预成型FA的产量提高了119 g/d,但产量提高了
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of a blend of palmitic and stearic acid on transfer of preformed fatty acids into milk fat using an 18 C n-3 fatty acid perturbation model.

The transfer of dietary fatty acids (FA) into milk fat is variable and has been reported to be higher on lower fat diets, which may be a homeorhetic adaptation to support milk fat production. The objective of this study was to determine the effect of increasing dietary fat on the kinetics of transfer of preformed FA into milk fat using a perturbation model based on abomasal infusion of a bolus of n-3 FA. Eight ruminally cannulated multiparous Holstein cows (115 ± 32 DIM and producing 41.5 ± 4.43 kg of milk; mean ± SD) were used in a switchback design with three 21-d periods. Treatments were a low-fat basal diet (CON) and the basal diet supplemented with a blend of palmitic and stearic FA fed at 2% DM (Fat; 33.5% 16:0, 53.1% 18.0, and 6.2% 18:1n-9). Increasing dietary FA tended to increase milk yield by 2.2 kg/d and increased milk fat yield by 170 g/d. Yield of preformed FA in milk was increased 119 g/d but yield of <16 C and 16 C FA was not changed compared with CON. Apparent total-tract digestibility of DM, OM, NDF, and FA were not changed by FA supplementation. Transfer of dietary 18 C FA to milk fat was 110% of dietary fat consumed in CON and was decreased to 82% in the Fat treatment. On d 15 of each period, cows were abomasally infused with a free FA stock that provided 44 g of α-linolenic acid (ALA) and 20 g of stearidonic acid (SDA), and milk FA profile was observed over the following 7 d. Maximal enrichment of ALA and SDA in milk fat occurred at the second milking following the bolus (∼14 h) and returned to baseline concentrations by 74 h. Increasing dietary fat decreased total transfer of n-3 FA by 5.4 percentage units. Total transfer of infused ALA was 51.9% and SDA was 27.9% in the CON and decreased to 43.3% and 22.7% in the high-fat diet, respectively. Similar to previous work, the majority (81%) of the n-3 FA transferred to milk fat occurred in the first 24 h, which is expected to represent direct transfer of absorbed FA to milk fat and was not influenced by dietary fat. The greater than 100% transfer efficiency of 18 C FA to milk fat and the higher transfer efficiency of n-3 FA to milk fat when feeding a lower fat diet indicates dynamic partitioning of absorbed FA that is responsive to dietary FA supply.

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来源期刊
Journal of Dairy Science
Journal of Dairy Science 农林科学-奶制品与动物科学
CiteScore
7.90
自引率
17.10%
发文量
784
审稿时长
4.2 months
期刊介绍: The official journal of the American Dairy Science Association®, Journal of Dairy Science® (JDS) is the leading peer-reviewed general dairy research journal in the world. JDS readers represent education, industry, and government agencies in more than 70 countries with interests in biochemistry, breeding, economics, engineering, environment, food science, genetics, microbiology, nutrition, pathology, physiology, processing, public health, quality assurance, and sanitation.
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