PS11-8. Relationships Between Visceral Organ Mass and Feedlot Performance of Holstein Steers, SimAngus x Holstein Steers and Heifers, and SimAngus Steers.

IF 3.7 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Journal of animal science Pub Date : 2026-09-29 DOI:10.1093/jas/skag272.435

Melanie Pimentel-Concepción, Daniel D Buskirk, Jerad Jaborek

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引用次数: 0

Abstract

Visceral organ mass contributes substantially to maintenance energy expenditure and, as a result, influences growth performance and feed efficiency in feedlot cattle. This study evaluated visceral organ weights expressed as a percentage of empty body weight (EBW) and the relationships between those percentages and performance traits. Feedlot performance was compared among Holstein (HO) steers (n = 42), SimmentalxAngusxHO (SMANxHO) heifers (n = 38) and steers (n = 39), and SMAN steers (n = 42). Cattle were randomly allocated by body weight (BW) to seven pens per cattle type and fed for 189 (SMANxHO heifers), 232 (SMANxHO steers), 272 (SMAN steers), and 335 d (HO steers). Body weight, average daily gain (ADG), and gain to feed (G:F) were determined every 28 d, and dry matter intake (DMI) was determined every 14 d. A subset of 28 cattle (7 per type) were scheduled for harvest at a similar empty body fat (32.5%) as predicted by ultrasound. Empty BW was calculated as shrunk BWx0.891. The HO and SMAN steers had the greatest EBW, followed by SMANxHO steers, and lastly heifers (P < 0.01). Gastrointestinal tract (GIT) and non-GIT organ weights will herein be expressed as a percentage of EBW. Esophagus, rumen, reticulum, cecum, and pancreas were similar among cattle types (P > 0.08). Across cattle types, GIT weight was negatively correlated with EBW (R=-0.71;P<0.01). The GIT weight was greatest for SMANxHO heifers, intermediate for HO and SMANxHO steers, and least for SMAN steers (P = 0.05). Within GIT components, SMAN steers had lesser omasum, abomasum, and small intestine weights compared with the other cattle types (P ≤ 0.05), while having similar abomasum weights to SMANxHO steers. Large intestine weight was greatest for SMANxHO heifers (P < 0.01), followed by SMANxHO steers, and lastly HO and SMAN steers. Non-GIT organ weights were greater for SMANxHO cattle than HO steers and SMAN steers (P < 0.01). Liver weight was greater for HO steers and SMANxHO cattle compared with SMAN steers (P < 0.02). Total GIT and non-GIT weights were greater for SMANxHO cattle compared with SMAN steers (P < 0.01). For HO steers, GIT and liver weights were negatively correlated with ADG (R=-0.66) and DMI (R=-1.00;P<0.05), which may reflect increased metabolic maintenance costs associated with greater GIT and non-GIT organs. The GIT weights for SMANxHO cattle were positively correlated with G:F (R = 1.00;P<0.05), suggesting that greater digestive capacity may support improved nutrient utilization in beef x dairy cattle. For SMAN steers, GIT (R = 0.94) and liver (R = 1.00) weights were positively correlated with ADG (P < 0.05). The SMANxHO cattle exhibited greater relative GIT and non-GIT organ weights but also demonstrated superior G:F. Collectively, these results indicate differences among beef, beef x dairy, and dairy cattle in GIT and non-GIT organs contribute to variation in feedlot growth and feed efficiency. For image description, please refer to the figure legend and surrounding text.

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PS11-8。荷斯坦阉牛、荷斯坦×荷斯坦阉牛和小母牛、荷斯坦阉牛内脏器官质量与饲用性能的关系。

内脏器官质量在维持能量消耗方面起着重要作用，因此影响着饲养场牛的生长性能和饲料效率。本研究评估了内脏器官重量占空体重（EBW）的百分比，以及这些百分比与性能性状之间的关系。比较荷斯坦（HO）阉牛（n = 42）、西蒙塔尔和安格斯霍（SMANxHO）小母牛（n = 38）和阉牛（n = 39）以及斯曼阉牛（n = 42）的饲养场生产性能。按体重（BW）将牛随机分配到7个栏中，分别饲喂189头（SMANxHO型）、232头（SMANxHO型）、272头（SMAN型）和335天（HO型）。每28 d测定一次体重、平均日增重（ADG）和料重比（G:F），每14 d测定一次干物质采食量（DMI）。28头牛（每种7头）计划在超声预测的相似空体脂（32.5%）下收获。空BW计算为缩水BWx0.891。HO和SMAN阉牛的EBW最大，其次是SMANxHO阉牛，最后是小母牛（P < 0.01）。胃肠道（GIT）和非胃肠道器官重量将在这里表示为EBW的百分比。不同类型牛的食道、瘤胃、网状、盲肠和胰腺相似（P > 0.08）。在不同牛种中，臀重与EBW呈负相关（R=-0.71;P<0.01）。SMANxHO小母牛的GIT重量最大，HO和SMANxHO小母牛的GIT重量居中，SMAN小母牛的GIT重量最小（P = 0.05）。在胃肠道成分中，SMAN肉牛的瓣胃、皱胃和小肠重量低于其他类型的肉牛（P≤0.05），而其皱胃重量与SMAN肉牛相似。SMANxHO犊牛大肠重最大（P < 0.01）， SMANxHO犊牛次之，HO犊牛和SMAN犊牛最后。SMANxHO牛非git器官重量大于HO和SMAN肉牛（P < 0.01）。与SMAN肉牛相比，HO肉牛和SMANxHO肉牛的肝脏重量更大（P < 0.02）。与SMAN肉牛相比，SMANxHO肉牛的总GIT和非GIT重量更大（P < 0.01）。对于HO肉牛，GIT和肝脏重量与ADG （R=-0.66）和DMI （R=-1.00;P<0.05）呈负相关，这可能反映了更大的GIT和非GIT器官相关的代谢维持成本增加。SMANxHO牛的胃肠道重量与G:F呈显著正相关（R = 1.00;P<0.05），说明较大的消化能力有助于提高肉牛对营养物质的利用率。对于SMAN肉牛，GIT （R = 0.94）和肝脏（R = 1.00）重量与平均日增重呈正相关（P < 0.05）。SMANxHO牛表现出更大的相对GIT和非GIT器官重量，但也表现出更优越的G:F。综上所述，这些结果表明，牛肉、牛乳和奶牛在胃肠道和非胃肠道器官上的差异导致了饲养场生长和饲料效率的变化。有关图像说明，请参阅图例和周围文字。

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

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.