179 Effect of feeding alternative coproducts in finishing calves

IF 2.9 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Journal of animal science Pub Date : 2025-06-27 DOI:10.1093/jas/skaf170.039

Colin T Tobin, Kendall C Swanson, Warren C Rusche, Madison Bierman, Zachary K Smith

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引用次数: 0

Abstract

Recent expansion of oilseed crushing facilities and multiple designations of renewable diesel fuel have created competitive markets in protein supplements for beef cattle. More research on the direct comparison to identify differences in finishing of beef cattle fed alternative coproducts produced across the northern US is needed for these expanding opportunities. The objective of this study was to determine the effects of alternative coproducts on dry matter intake (DMI), growth performance, and carcass characteristics of calf-fed finishing steers. Two hundred fifty-one crossbred steer calves (n=251, initial shrunk body weight [BW], 344 ± 9 kg) were stratified by source, and assigned to one of twenty-four pens (n=10-11 steers/pen) and one of three dietary treatments. Diets were formulated to provide similar amounts of crude protein and NEg with dried distillers grains plus solubles (DDGS), canola meal (CM), or soybean meal (SBM). Steers were fed for a total of 155 and 170 days with individual weights taken on d -1, 0, 23, 50, 78, 110, 154, and 155 and d -1, 0, 31, 56, 85, 112, 169, and 170 for block 1-3 and block 4, respectively. A 4% pencil shrink was applied to the initial and final BW. Growth and carcass data were analyzed in a generalized randomized block design using the GLIMMIX procedure of SAS 9.4 with dietary treatment and block (source) as fixed effects and pen serving as experimental unit. Dietary treatment differences in growth performance were detected with final BW (P = 0.04), BW gain (P = 0.02), and average daily gain (ADG, P = 0.02). Steers fed CM had greater final BW (P = 0.03), BW gain (P = 0.01), and ADG (P = 0.01) by 2.3%, 5.8%, and 5.8% to steers fed SBM, respectively. No differences were detected in DMI and gain:feed (P > 0.1). Dietary treatment differences in carcass characteristics were detected with hot carcass weight (HCW, P = 0.02), 12th rib fat thickness (RF, P = 0.03), and dressing percentage (DP, P = 0.01). Additionally, dietary treatment tended to influence USDA yield grade (YG, P = 0.06). Steers assigned to CM had 3.6% greater HCW (P = 0.01) and tended to have 2.5% heavier HCW (P = 0.09) compared to steers receiving SBM and DDGS, respectively. The USDA YG tended to be greater for CM than SBM (3.87 and 3.66, respectively) which corresponds to 0.16 cm greater RF for the CM fed steers (P = 0.02). No differences were detected in ribeye area or marbling score (P ≥ 0.16). No performance adjusted net energy differences were detected between the coproducts (P ≥ 0.71).

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179饲喂替代副产物对育肥犊牛的影响

最近油籽压榨设施的扩大和可再生柴油燃料的多种指定创造了肉牛蛋白质补充剂的竞争市场。这些扩大的机会需要更多的直接比较研究，以确定饲喂美国北部生产的替代副产品的肉牛的肥育差异。本研究旨在确定替代副产物对犊牛育肥牛干物质采食量（DMI）、生长性能和胴体特性的影响。选用251头杂交犊牛（初始缩小体重为344±9 kg），按来源分层，分为24个栏（n=10-11头/栏）和3个饲粮处理中的一个。饲粮中添加干酒糟加可溶物（DDGS）、菜籽粕（CM）或豆粕（SBM），以提供相近数量的粗蛋白质和NEg。试验共饲喂155和170天，分别在第1、0、23、50、78、110、154和155天以及第1、0、31、56、85、112、169和170天分别饲喂第1-3和第4块。在初始和最终的BW上应用4%的铅笔收缩。采用SAS 9.4的GLIMMIX程序对生长和胴体数据进行广义随机区组设计，以饲粮处理和区组（源）为固定效应，猪栏为实验单元。通过最终体重（P = 0.04）、体重增重（P = 0.02）和平均日增重（P = 0.02）检测饲粮处理对生长性能的影响。豆粕的末重（P = 0.03）、体重增重（P = 0.01）和平均日增重（P = 0.01）分别比豆粕高2.3%、5.8%和5.8%。DMI和增重(P >；0.1)。通过热胴体重（HCW, P = 0.02）、第12肋脂厚度（RF, P = 0.03）和屠宰率（DP, P = 0.01）检测饲粮处理对胴体性状的影响。此外，饲粮处理倾向于影响美国农业部产量等级（YG, P = 0.06）。与SBM和DDGS组相比，CM组的HCW增加3.6% (P = 0.01)， HCW增加2.5% （P = 0.09）。CM饲肉牛的USDA YG高于SBM（分别为3.87和3.66），对应于CM饲肉牛的RF高出0.16 CM （P = 0.02）。肋眼面积和大理石纹评分差异无统计学意义（P≥0.16）。副产物间无性能调整净能差异（P≥0.71）。

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来源期刊

Journal of animal science 农林科学-奶制品与动物科学

CiteScore

4.80

自引率

12.10%

发文量

1589

审稿时长

3 months

期刊介绍： The Journal of Animal Science (JAS) is the premier journal for animal science and serves as the leading source of new knowledge and perspective in this area. JAS publishes more than 500 fully reviewed research articles, invited reviews, technical notes, and letters to the editor each year. Articles published in JAS encompass a broad range of research topics in animal production and fundamental aspects of genetics, nutrition, physiology, and preparation and utilization of animal products. Articles typically report research with beef cattle, companion animals, goats, horses, pigs, and sheep; however, studies involving other farm animals, aquatic and wildlife species, and laboratory animal species that address fundamental questions related to livestock and companion animal biology will be considered for publication.