Simulation of loading and unloading through ramps of different configuration: effects on the ease of handling and physiological response of pigs of two slaughter weights

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-24 DOI:10.1139/cjas-2024-0029

Aloma Zoratti, Jéssica Gonçalves Vero, J. Genova, N. Devillers, S. Conte, A. Bridi, E. Piasentier, L. Faucitano

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Abstract

Behaviour, heart rate (HR) and blood lactate concentration of 144 pigs, equally distributed into lighter (L, 122 kg on average) and heavier (H, 153 kg on average) groups, were assessed to study the effects of slaughter weight on pigs’ response to a simulated loading and unloading procedure using four ramp configurations, i.e., 0º (level ramp), 15º slope and 1.66 m length, 15º slope and 2.71 m length (15ºLO), and 25º slope and 1.66 m. No interaction was found between ramp configuration and slaughter weight (P > 0.10). The frequencies of pigs’ slips or falls (P = 0.01) increased on sloped ramps compared to the floor level (Padj < 0.05), and pigs jumped-off more from the 25° than the 15°LO ramp (Padj = 0.05). Pigs negotiating the 25° slope ramp presented a higher concentration of blood lactate than those walking at the floor level (P = 0.02). When compared to L pigs, H pigs were more reluctant to move (P = 0.05) and, presented higher increments of HR (ΔHR) during handling (P = 0.03). In conclusion, heavier pigs were more difficult to handle, regardless of the ramp steepness, which alone reduced ease of handling and affected the physiological condition of pigs.

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模拟通过不同配置的坡道进行装卸：对两种屠宰重量的猪的易操作性和生理反应的影响

对 144 头猪的行为、心率（HR）和血液乳酸浓度进行了评估，这些猪平均分为体重较轻（L 组，平均 122 千克）和体重较重（H 组，平均 153 千克）两组，以研究屠宰体重对猪在使用四种斜坡配置（即 0º（水平斜坡）、15º斜坡和 1.66 米长、15º斜坡和 2.71 米长（15ºLO）以及 25º斜坡和 1.66 米长）进行模拟装卸程序时的反应的影响、坡道配置与屠宰体重之间没有交互作用（P > 0.10）。与地面相比（Padj < 0.05），斜坡上猪滑倒或摔倒的频率增加（P = 0.01），从 25°LO 斜坡上跳下的猪比从 15°LO 斜坡上跳下的猪多（Padj = 0.05）。与在地面上行走的猪相比，在 25° 斜坡上行走的猪血液中乳酸浓度更高（P = 0.02）。与 L 型猪相比，H 型猪更不愿意移动（P = 0.05），并且在搬运过程中心率增量（ΔHR）更高（P = 0.03）。总之，无论坡道坡度如何，较重的猪都更难搬运，这不仅降低了搬运的便利性，还影响了猪的生理状况。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.