增加日粮中来自豆粕的瘤胃可降解蛋白质可改善育成肉牛的生长性能,但会增加肝脓肿的严重程度

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Applied Animal Science Pub Date : 2024-09-16 DOI:10.15232/aas.2024-02584
Cassidy R. Ross, Zachary K. Smith, Forest L. Francis, Ana Clara B. Menezes, Warren C. Rusche
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引用次数: 0

摘要

目的 我们的目的是确定在以高水分玉米为基础的日粮中,用溶剂萃取豆粕(SBM)部分或完全替代干蒸馏谷物加溶质(DDGS)是否会影响育成牛的生长性能、血清尿素氮(SUN)浓度和胴体性状。实验处理为饲喂 20% DM 的 DDGS(DDGS)、替代 50% DDGS 的 SBM(SBM50)和替代 100% DDGS 的 SBM(SBM100)。母牛被分配到 24 个栏中的一个(每个处理 8 个栏)。在第 77、105 和 139 天采集血清以测定 SUN。使用正交多项式对线性和二次效应进行评估,并将 SUN 作为重复测量指标进行分析。处理影响 ADG(二次)和 G:F。处理往往影响胴体调整后的 G:F(二次方),SBM 增加了日粮 NE(线性)。SBM100的肋眼面积更大(线性),但DP减少(线性)。额外的 SBM 会改变肝脏评分,SBM100 的脓肿更严重。用 SBM 替代 DDGS 增加了保留蛋白和肋眼面积,降低了 DP,G:F 呈二次方提高,但肝脓肿的严重程度增加。
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Increased dietary rumen degradable protein from soybean meal improved growth performance but increased liver abscess severity in finishing beef steers

Objective

Our objective was to determine whether partial or complete replacement of dried distillers grains plus solubles (DDGS) with solvent-extracted soybean meal (SBM) in diets based on high-moisture corn affected growth performance, sera urea nitrogen (SUN) concentrations, and carcass traits in finishing steers.

Materials and Methods

Beef steers (n = 189; initial shrunk BW = 381 ± 37.1 kg) were used in a 139-d experiment. Treatments were DDGS fed at 20% DM (DDGS), SBM replacing 50% of DDGS (SBM50), and SBM replacing 100% of DDGS (SBM100). Steers were allotted to 1 of 24 pens (8 pens per treatment). Sera was harvested on d 77, 105, and 139 for determination of SUN. Linear and quadratic effects were evaluated using orthogonal polynomials with SUN analyzed as repeated measures.

Results and Discussion

Feeding SBM increased final BW (linear). Treatment affected ADG (quadratic) and G:F. Treatment tended to affect carcass-adjusted G:F (quadratic), and SBM increased dietary NE (linear). The SBM100 had greater rib-eye area (linear) but decreased DP (linear). Additional SBM altered liver scores with SBM100 having more severe abscesses. Day and treatment affected SUN, increasing over time, and steers fed SBM100 had greater SUN concentrations than those fed DDGS.

Implications and Applications

Replacement of DDGS with SBM increased retained protein and rib-eye area, tended to decrease DP, and tended to quadratically improve G:F, with increased liver abscess severity.

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来源期刊
Applied Animal Science
Applied Animal Science AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
3.00
自引率
6.70%
发文量
68
期刊最新文献
Table of Contents Editorial Board Call for Submissions Fabrication yields and allometric growth coefficients of carcass components of serially slaughtered implanted or non-implanted beef steers Comparison of a single extended-release implant and a re-implant strategy on performance and carcass characteristics of beef finishing heifers
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