Relationship of liver abnormalities with carcass performance and value*

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Applied Animal Science Pub Date : 2024-06-01 DOI:10.15232/aas.2023-02482
B.B. Grimes , T.J. McEvers , T.C. Tennant , J.W. Johnson , T.E. Lawrence
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引用次数: 0

Abstract

Objective

We evaluated the association of liver ab- normalities with carcass characteristics and value, using 2 independent databases generated from 2010 through 2021.

Materials and Methods

Liver abnormalities (ab- scesses, congestive heart failure [CHF], flukes, telangiec- tasis) and associated carcass outcomes were evaluated for 371,476 carcasses housed in database 1. Liver abnormali- ties of individual carcasses (n = 1,166,056) in database 2 were captured as lot-level (n = 7,196) audits and summa- rized as frequencies across demographic categories. Data were analyzed with mixed models.

Results and Discussion

Livers were scored as fol- lows: edible = no abscess or abnormality, A− = 1 to 2 small abscesses or inactive scars, A = 1 or 2 large ab- scesses or multiple small abscesses, A+ = multiple large abscesses, A+adhesion (A+AD) = liver adhered to part of the gastrointestinal tract or diaphragm or both, A+open (A+OP) = open abscess, A+adhesion/open (A+AD/OP) = combination of A+AD and A+OP score. Other non- abscess liver abnormalities recorded were CHF = dark mottled blue appearance and noticeably enlarged; flukes = presence of black lymph nodes, enlarged thickened bile ducts, visible dark tracts scattered throughout the dorsal side of the liver, or presence of flukes within the liver; and telangiectasis = peppering of blue/red dots on the surface of the liver tissue. Liver abnormality rates across both da- tabases were A− = 7.3% to 7.4%, A = 2.7% to 5.3%, A+ = 2.4% to 4.8%, A+AD = 3.9% to 6.2%, A+OP = 1.4% to 1.7%, A+AD/OP = 0.8% to 1.3%, CHF = 0.1% to 0.2%, flukes = 1.3% to 3.6%, telangiectasis = 0.6% to 0.7%, with 67.0% to 77.0% of livers being edible. Carcasses with se- vere abscesses (A+, A+AD, A+OP, A+AD/OP) or CHF had less hot carcass weight (HCW; 13.0 and 42.5 kg, re- spectively) compared with carcasses with edible livers. All abnormalities except telangiectasis reduced LM area. Less 12th-rib s.c. fat was observed for carcasses with A−, A, A+, A+AD, and CHF abnormalities compared with car- casses with edible livers. As liver abscess severity increased compared with edible livers, carcass value diminished and frequency of carcasses railed off line (removed from the production line) increased, particularly for A+AD (4.2%), A+OP (9.7%), and A+AD/OP (11.9%).

Implications and Applications

Based on analysis of this large database, liver abnormalities, especially severely abscessed and CHF outcomes, greatly affect HCW. These results indicate control of liver abscesses, and understand- ing the development of CHF, is important to prevent loss- es in carcass value.

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肝脏异常与胴体性能和价值的关系*
材料和方法对数据库 1 中饲养的 371,476 头胴体的肝脏异常(肝脏脓肿、充血性心力衰竭 [CHF]、吸虫、毛细血管扩张)和相关胴体结果进行了评估。数据库 2 中单个胴体(n = 1,166,056)的肝脏异常情况以批次(n = 7,196)为单位进行审计,并汇总为不同人口统计类别的频率。数据采用混合模型进行分析。结果与讨论肝脏按以下方式评分:可食用 = 无脓肿或异常,A- = 1 到 2 个小脓肿或不活动疤痕,A = 1 或 2 个大脓肿或多个小脓肿,A+ = 多个大脓肿,A+粘连(A+AD) = 肝脏粘连到部分胃肠道或横膈膜或两者都粘连,A+开放(A+OP) = 开放性脓肿,A+粘连/开放(A+AD/OP) = A+AD 和 A+OP 分数的组合。记录到的其他非脓肿肝脏异常情况包括:CHF = 外观呈深斑驳蓝色且明显肿大;虫蚀 = 存在黑色淋巴结、肿大增粗的胆管、散布在整个肝脏背侧的可见暗色道或肝脏内存在虫蚀;毛细血管扩张 = 肝组织表面出现点状蓝色/红色小点。两个阶段的肝脏异常率分别为:A- = 7.3% 到 7.4%,A = 2.7% 到 5.3%,A+ = 2.4% 到 4.8%,A+AD = 3.9% 到 6.2%,A+OP = 1.4% 到 1.7%, A+AD/OP = 0.8% to 1.3%, CHF = 0.1% to 0.2%, flukes = 1.3% to 3.6%, telangiectasis = 0.6% to 0.7%, 67.0% to 77.0% 的肝脏可食用。与可食用肝脏的胴体相比,患有严重脓肿(A+、A+AD、A+OP、A+AD/OP)或CHF的胴体热重(HCW;分别为13.0千克和42.5千克)较轻。除毛细血管扩张外,所有异常情况都会减少肝脏内膜面积。与有可食用肝脏的胴体相比,有 A-、A、A+、A+AD 和 CHF 异常的胴体第 12 肋 s.c. 脂肪较少。与可食用肝脏相比,随着肝脓肿严重程度的增加,胴体价值降低,胴体下线(从生产线上移除)的频率增加,尤其是 A+AD (4.2%)、A+OP (9.7%) 和 A+AD/OP (11.9%)。这些结果表明,控制肝脓肿和了解 CHF 的发展对防止胴体价值损失非常重要。
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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
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