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From unloading to trimming: studying bruising in individual slaughter cattle

Livestock bruising is both an animal welfare concern and a detriment to the economic value of carcasses. Understanding the causes of bruising is challenging due to the numerous factors that have been shown to be related to bruise prevalence. While most cattle bruising studies collect and analyze dat...

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Autores principales: Kline, Helen C, Weller, Zachary D, Grandin, Temple, Algino, Ryan J, Edwards-Callaway, Lily N
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7594242/
https://www.ncbi.nlm.nih.gov/pubmed/33150305
http://dx.doi.org/10.1093/tas/txaa165
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author Kline, Helen C
Weller, Zachary D
Grandin, Temple
Algino, Ryan J
Edwards-Callaway, Lily N
author_facet Kline, Helen C
Weller, Zachary D
Grandin, Temple
Algino, Ryan J
Edwards-Callaway, Lily N
author_sort Kline, Helen C
collection PubMed
description Livestock bruising is both an animal welfare concern and a detriment to the economic value of carcasses. Understanding the causes of bruising is challenging due to the numerous factors that have been shown to be related to bruise prevalence. While most cattle bruising studies collect and analyze data on truckload lots of cattle, this study followed a large number (n = 585) of individual animals from unloading through postmortem processing at five different slaughter plants. Both visual bruise presence and location was recorded postmortem prior to carcass trimming. By linking postmortem data to animal sex, breed, trailer compartment, and traumatic events at unloading, a rich analysis of a number of factors related to bruise prevalence was developed. Results showed varying levels of agreement with other published bruising studies, underscoring the complexity of assessing the factors that affect bruising. Bruising prevalence varied across different sex class types (P < 0.001); 36.5% of steers [95% confidence interval (CI): 31.7, 41.6; n = 378], 52.8% of cows (45.6, 60.0; 193), and 64.3% of bulls (no CI calculated due to sample size; 14) were bruised. There was a difference in bruise prevalence by trailer compartment (P = 0.035) in potbelly trailers, indicating that cattle transported in the top deck were less likely to be bruised (95% CI: 26.6, 40.4; n = 63) compared to cattle that were transported in the bottom deck (95% CI: 39.6, 54.2; n = 89). Results indicated that visual assessment of bruising underestimated carcass bruise trimming. While 42.6% of the carcasses were visibly bruised, 57.9% of carcasses were trimmed due to bruising, suggesting that visual assessment is not able to capture all of the carcass loss associated with bruising. Furthermore, bruises that appeared small visually were often indicators of larger, subsurface bruising, creating an “iceberg effect” of trim loss due to bruising.
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spelling pubmed-75942422020-11-03 From unloading to trimming: studying bruising in individual slaughter cattle Kline, Helen C Weller, Zachary D Grandin, Temple Algino, Ryan J Edwards-Callaway, Lily N Transl Anim Sci Animal Health and Well Being Livestock bruising is both an animal welfare concern and a detriment to the economic value of carcasses. Understanding the causes of bruising is challenging due to the numerous factors that have been shown to be related to bruise prevalence. While most cattle bruising studies collect and analyze data on truckload lots of cattle, this study followed a large number (n = 585) of individual animals from unloading through postmortem processing at five different slaughter plants. Both visual bruise presence and location was recorded postmortem prior to carcass trimming. By linking postmortem data to animal sex, breed, trailer compartment, and traumatic events at unloading, a rich analysis of a number of factors related to bruise prevalence was developed. Results showed varying levels of agreement with other published bruising studies, underscoring the complexity of assessing the factors that affect bruising. Bruising prevalence varied across different sex class types (P < 0.001); 36.5% of steers [95% confidence interval (CI): 31.7, 41.6; n = 378], 52.8% of cows (45.6, 60.0; 193), and 64.3% of bulls (no CI calculated due to sample size; 14) were bruised. There was a difference in bruise prevalence by trailer compartment (P = 0.035) in potbelly trailers, indicating that cattle transported in the top deck were less likely to be bruised (95% CI: 26.6, 40.4; n = 63) compared to cattle that were transported in the bottom deck (95% CI: 39.6, 54.2; n = 89). Results indicated that visual assessment of bruising underestimated carcass bruise trimming. While 42.6% of the carcasses were visibly bruised, 57.9% of carcasses were trimmed due to bruising, suggesting that visual assessment is not able to capture all of the carcass loss associated with bruising. Furthermore, bruises that appeared small visually were often indicators of larger, subsurface bruising, creating an “iceberg effect” of trim loss due to bruising. Oxford University Press 2020-09-08 /pmc/articles/PMC7594242/ /pubmed/33150305 http://dx.doi.org/10.1093/tas/txaa165 Text en © The Author(s) 2020. Published by Oxford University Press on behalf of the American Society of Animal Science. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Animal Health and Well Being
Kline, Helen C
Weller, Zachary D
Grandin, Temple
Algino, Ryan J
Edwards-Callaway, Lily N
From unloading to trimming: studying bruising in individual slaughter cattle
title From unloading to trimming: studying bruising in individual slaughter cattle
title_full From unloading to trimming: studying bruising in individual slaughter cattle
title_fullStr From unloading to trimming: studying bruising in individual slaughter cattle
title_full_unstemmed From unloading to trimming: studying bruising in individual slaughter cattle
title_short From unloading to trimming: studying bruising in individual slaughter cattle
title_sort from unloading to trimming: studying bruising in individual slaughter cattle
topic Animal Health and Well Being
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7594242/
https://www.ncbi.nlm.nih.gov/pubmed/33150305
http://dx.doi.org/10.1093/tas/txaa165
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