饲喂3个成熟期的青贮牛，添加或不添加精料时胸最长肌脂肪酸分布和肌内脂肪浓度的变化

IF 0.8 4区农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Acta Agriculturae Scandinavica Section A-Animal Science Pub Date : 2021-03-18 DOI:10.1080/09064702.2021.1900381

Å. Randby, L. Aass, A. Haug

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引用次数: 1

摘要

摘要本试验旨在研究青贮草株成熟度对公牛胸最长肌肌内脂肪(IMF)浓度和脂肪酸谱的影响。从7 ~ 8月龄至屠宰，36头挪威红公牛在3个成熟期随意饲喂青贮草，添加或不添加精料。随着植株成熟度的增加，IMF中α-亚麻酸的比例降低(P = 0.04)。添加精料提高了亚油酸和C20:3n-6在IMF中的比例(P < 0.001)，降低了所有n-3多不饱和脂肪酸(P≤0.02)、共轭亚油酸(P < 0.01)和反式异戊酸(P < 0.001)。多不饱和脂肪酸n-6/n-3比值在1.0 ~ 2.1之间，随植株成熟度和精料添加量的增加而增加。结果表明，在放牧季节较短的地区，“草饲牛肉”也可以在室内用草青贮生产。

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Fatty acid profile and intramuscular fat concentration of Musculus longissimus thoracis in bulls fed grass silage harvested at one of three maturity stages, either with or without concentrate supplementation

ABSTRACT The study investigated the effect of plant maturity of grass silage on intramuscular fat (IMF) concentration and fatty acid profile in M. longissimus thoracis of bulls. From 7 to 8 months of age until slaughter, 36 bulls of Norwegian Red were offered grass silage harvested at three maturity stages ad libitum, with or without concentrate supplement. Increasing plant maturity decreased the proportion of α-linolenic acid in IMF (P = 0.04). Concentrate supplementation increased the proportions in IMF of linoleic acid (P < 0.001) and C20:3n-6 (P < 0.008), decreased all analysed n-3 polyunsaturated fatty acids (P ≤ 0.02), conjugated linoleic acid (P < 0.01) and trans vaccenic acid (P < 0.001). Polyunsaturated fatty acids n-6/n-3 ratios were in the range 1.0–2.1 and increased with plant maturity and concentrate supplementation. Results suggest that ‘grass-fed beef’ also may be produced indoors with grass silages in regions with short grazing season.

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来源期刊

Acta Agriculturae Scandinavica Section A-Animal Science 农林科学-奶制品与动物科学

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

>36 weeks

期刊介绍： Acta Agriculturæ Scandinavica, Section A – Animal Science publishes results of original research in animal science and their applications related to the following topics: -Animal breeding and genetics -Molecular genetics -Animal physiology and reproduction -Nutrition and feeding -Animal behaviour and welfare -General animal husbandry and systems of production, including economic and technical aspects -Hygiene and quality of animal products In addition to original articles, covering basic as well as applied subjects, the journal features review articles and short communications. Acta Agriculturæ Scandinavica, Section A – Animal Science forms part of a trilogy of titles published on behalf of the Nordic Association of Agricultural Scientists (NJF). The series also includes Section B - Soil & Plant Science and the recently launched Section C - Food Economics . Acta Agriculturae Scandinavica A, B and C are available to purchase as a combined subscription. This provides access to all three journals in the series, and is available to institutional subscribers only. For full pricing information, please view the Taylor & Francis Journals Price List here. Scientists in research, teaching and extension with specialised interest in animal science and production.