Meta-analysis of the effects of the dietary inclusion of brewers grains on feed intake, milk yield, and feed efficiency of lactating dairy cows

JDS communications Pub Date : 2025-05-01 DOI:10.3168/jdsc.2024-0626

S.C. Chelkapally , T.H. Terrill , I.M. Ogunade , Z.M. Estrada-Reyes , A.A. Pech-Cervantes

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Abstract

Distillery byproducts such as brewers grains (BG) have been widely used in dairy cow diets for decades to reduce diet costs and improve nutrient efficiency. Thus, the objective of this study was to evaluate the magnitude of the effects of dietary supplementation with BG on feed intake (DMI), digestibility, milk yield (MY), and feed efficiency (FE) of lactating dairy cows. A total of 12 peer-reviewed articles (n = 472 dairy cows) from 1983 to 2021 were collected systematically with the PRISMA method. The weighted raw mean differences (RMD) between dietary BG and control treatments were estimated with a robust variance estimation. Likewise, diet characteristics, such as CP content, NDF content, type of BG (wet = 1 and dry = 2), DIM, and BG inclusion rate (0 to 75%) were used as covariates in a meta-regression, subset, and dose-response analysis. Compared with the control, dietary BG decreased DMI (19.7 vs. 20.2 kg/d) and tended to increase MY (28.9 vs. 28.4 kg/d), but no effects were observed on FCM yield (29.1 vs. 28.8 kg/d), milk fat (3.8 vs. 3.7%), and milk protein (3.2 vs. 3.2%) concentrations. However, dietary BG increased FE (1.45 vs. 1.34 FCM/DMI) without influencing total-tract DM (61.9 vs. 55.7%) and NDF (49.7 vs. 54.5%) digestibility. Increasing the inclusion rate of BG linearly increased (R² = 0. 554) dietary NDF. Thus, the dose-response analysis revealed that feeding up to 20% BG (dietary NDF = 39%) to lactating dairy cows increased MY and FE. Overall, this meta-analysis supports the hypothesis that dietary BG improved FE in lactating dairy cows.

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饲粮中添加啤酒糟对泌乳奶牛采食量、产奶量和饲料效率影响的meta分析

几十年来，为了降低奶牛日粮成本和提高营养效率，酿酒副产物如啤酒糟（BG）已被广泛应用于奶牛日粮中。因此，本研究旨在评估饲粮中添加BG对泌乳奶牛采食量（DMI）、消化率、产奶量（MY）和饲料效率（FE）的影响程度。采用PRISMA方法系统收集了1983 ~ 2021年12篇同行评议论文（n = 472头奶牛）。饲粮BG和对照处理之间的加权原始平均差异（RMD）用稳健方差估计估计。同样，饮食特征，如CP含量、NDF含量、BG类型（湿= 1和干= 2）、DIM和BG包含率（0至75%）被用作meta回归、子集和剂量-反应分析的协变量。与对照组相比，饲粮中添加BG降低了DMI (19.7 vs. 20.2 kg/d)，有提高MY （28.9 vs. 28.4 kg/d）的趋势，但对FCM产量（29.1 vs. 28.8 kg/d）、乳脂（3.8 vs. 3.7%）和乳蛋白（3.2 vs. 3.2%）浓度没有影响。然而，饲粮BG提高了FE (1.45 vs. 1.34 FCM/DMI)，但不影响全消化道DM （61.9 vs. 55.7%）和NDF （49.7 vs. 54.5%）消化率。增加BG的包涵率线性增加（R2 = 0）。554)膳食NDF。因此，剂量效应分析显示，饲粮中添加20% BG（饲粮NDF = 39%）可提高泌乳奶牛的代谢能和FE。综上所述，本荟萃分析支持饲粮BG提高泌乳奶牛FE的假设。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

JDS communications Animal Science and Zoology

CiteScore

2.00

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0.00%

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