PSVI-16 An evaluation using a visual health scoring system with vaginal temperatures of newly received feedlot heifers on immune status

IF 2.7 2区 农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE Journal of animal science Pub Date : 2024-09-14 DOI:10.1093/jas/skae234.611
Mackenzie M Smithyman, Mark E Branine, Consuelo A Sowers, Glenn C Duff, Clint A Loest
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Abstract

Newly received feedlot cattle often experience immune function impairment caused by stressors such as marketing and transportation, resulting in bovine respiratory disease (BRD). Morbidity is often visually detected and medically treated by implementing a 4-point scoring system based on depression, appetite, respiration, and temperature (DART). Using DART scoring, cattle are treated with antimicrobial medications for BRD if they have a rectal temperature (RT) ≥ 40°C and a DART = 2 (scale = 1 to 4), or if they have a DART ≥ 3 regardless of the 40°C RT threshold. However, cattle often exhibit visible clinical symptoms of BRD but do not have a RT ≥ 40°C threshold to warrant medical treatment. Immune status can be measured using a nanotechnology-based immunity test (D2Dx). The objective of this study was to evaluate newly received feedlot heifers on subsequent health status using the DART scoring system and D2Dx values during a 28-d receiving period. Crossbred heifers [n = 198; initial body weight (BW) = 219 ± 63 kg] were initially processed, weighed, and allocated to one of 10 soil-surfaced pens (12 x 35 m; 20 heifers per pen). A blank controlled intravaginal drug release (CIDR) device attached with indwelling temperature probe (iButton DS1925L) was inserted vaginally into each heifer to record vaginal temperature (VT) every 10 min for 28 d. All heifers were evaluated daily (0700 h) for signs of morbidity by three individuals (blinded from each other) implementing DART scoring. Individual DART evaluations were then pooled prior to determination of heifers needing further evaluation for medical treatment. Serum was collected on d 1, 28, and when a heifer was brought to the chute and evaluated for medical treatment (PULL). Initial D2Dx values were not different (P ≥ 0.54) between healthy and morbid heifers upon feedlot arrival. Heifers with DART ≥ 2 that were treated for BRD had decreased (P ≤ 0.05) D2Dx values than healthy heifers with DART = 0. The D2Dx values were not different (P ≥ 0.15) between heifers with DART = 2 and DART = 3. Upon feedlot arrival, D2Dx values were low for all heifers and increased (P ≤ 0.05) by the 1st and 2nd PULL. By d 28, D2Dx values were greater (P ≤ 0.01) than both d 0 and all total PULL. Average VT decreased (P ≤ 0.01) from d 0 to 28, implying heifer health status improved by d 28 as D2Dx values increased. In this study, morbidity cannot be determined by D2Dx values upon arrival. Employing the DART scoring method accompanied with the D2Dx immunity test provided an overview of how effective clinical BRD can be diagnosed. Therefore, contributing to the improvement and development of more effective strategies for identifying respiratory diseases in feedlot cattle.
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PSVI-16 使用视觉健康评分系统和阴道温度对新接收的饲养场小母牛的免疫状态进行评估
新接收的饲养场牛往往会因销售和运输等应激因素而导致免疫功能受损,从而引发牛呼吸道疾病(BRD)。发病率通常通过肉眼检测,并通过基于抑郁、食欲、呼吸和体温(DART)的 4 点评分系统进行药物治疗。利用 DART 评分法,如果牛的直肠温度(RT)≥ 40°C,且 DART = 2(评分 = 1-4),或者如果牛的 DART ≥ 3,而不管其直肠温度(RT)是否达到 40°C 的临界值,则使用抗菌药物治疗 BRD。不过,牛群通常会表现出明显的 BRD 临床症状,但 RT ≥ 40°C 的阈值却不足以进行治疗。免疫状态可通过基于纳米技术的免疫测试(D2Dx)来测量。本研究的目的是使用 DART 评分系统和 D2Dx 值评估新接收的饲养场小母牛在 28 天接收期内的后续健康状况。杂交小母牛[n = 198;初始体重 (BW) = 219 ± 63 千克]经过初步处理、称重,并被分配到 10 个土壤铺设的围栏(12 x 35 米;每个围栏 20 头小母牛)中的一个。每头小母牛的阴道内插入一个空白的阴道内药物释放(CIDR)受控装置,该装置附有留置温度探头(iButton DS1925L),每 10 分钟记录一次阴道温度(VT),持续 28 天。所有小母牛每天(7:00)由三人(互不设盲)采用 DART 评分法评估发病迹象。然后,在确定母牛是否需要接受进一步的医疗评估之前,将个人的 DART 评估结果汇总。在第 1 天、第 28 天以及小母牛被送入溜槽并接受治疗评估(PULL)时收集血清。健康母牛和发病母牛到达饲养场时的初始 D2Dx 值没有差异(P ≥ 0.54)。与 DART = 0 的健康小母牛相比,DART ≥ 2 且接受过 BRD 治疗的小母牛的 D2Dx 值降低(P ≤ 0.05)。到达饲养场后,所有母牛的 D2Dx 值都很低,到第 1 次和第 2 次挤奶时,D2Dx 值有所增加(P ≤ 0.05)。到第 28 天时,D2Dx 值比第 0 天和所有 PULL 总值都大(P ≤ 0.01)。从第 0 天到第 28 天,平均 VT 值下降(P ≤ 0.01),这意味着随着 D2Dx 值的增加,小母牛的健康状况到第 28 天有所改善。在这项研究中,到达时的 D2Dx 值无法确定发病率。采用 DART 评分法和 D2Dx 免疫测定可大致了解如何有效诊断临床 BRD。因此,这有助于改进和开发更有效的饲养场牛呼吸道疾病识别策略。
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来源期刊
Journal of animal science
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.
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