TY - JOUR

T1 - Optimising the sampling procedure for forensic investigation of bruises on pigs

AU - Barington, Kristiane

AU - Skovgaard, Kerstin

AU - Henriksen, Nicole Lind

AU - Jensen, Henrik Elvang

PY - 2020

Y1 - 2020

N2 - Background: Human-inflicted bruises on pigs are a violation of the law and affected tissue is regularly sent for forensic investigation. The authors aimed to evaluate the variation in inflammation within and between human-inflicted porcine bruises in order to determine the optimal sampling procedure. Methods: Skin and muscle tissues from the centre and ends of 21 bruises were evaluated histologically. Moreover, RNA was extracted from the subcutaneous fat tissue. The bruises were detected during meat inspection at the slaughter line, and all carcases were kept at 5°C for 12-24 hours before sampling. Results: The sampling site with the most infiltration of neutrophils and macrophages differed between bruises inflicted on the same pig and between bruises inflicted on more pigs within the same delivery. The extracted RNA had RIN (RNA integrity number) values from 3 to 6.5. Conclusions: Tissue samples should always be taken from both skin and underlying muscle tissue. Samples should be collected from several sites along each bruise, and all bruises should be sampled in order to include the site of maximum tissue damage and inflammation. Moreover, RNA of sufficient quality for quantitative PCR and subsequent age estimation cannot be obtained from carcases kept for 12-24 hours at 5°C.

AB - Background: Human-inflicted bruises on pigs are a violation of the law and affected tissue is regularly sent for forensic investigation. The authors aimed to evaluate the variation in inflammation within and between human-inflicted porcine bruises in order to determine the optimal sampling procedure. Methods: Skin and muscle tissues from the centre and ends of 21 bruises were evaluated histologically. Moreover, RNA was extracted from the subcutaneous fat tissue. The bruises were detected during meat inspection at the slaughter line, and all carcases were kept at 5°C for 12-24 hours before sampling. Results: The sampling site with the most infiltration of neutrophils and macrophages differed between bruises inflicted on the same pig and between bruises inflicted on more pigs within the same delivery. The extracted RNA had RIN (RNA integrity number) values from 3 to 6.5. Conclusions: Tissue samples should always be taken from both skin and underlying muscle tissue. Samples should be collected from several sites along each bruise, and all bruises should be sampled in order to include the site of maximum tissue damage and inflammation. Moreover, RNA of sufficient quality for quantitative PCR and subsequent age estimation cannot be obtained from carcases kept for 12-24 hours at 5°C.

KW - bruise

KW - forensic pathology

KW - histology

KW - pig

KW - RNA integrity

KW - RNA quality

U2 - 10.1136/vr.105625

DO - 10.1136/vr.105625

M3 - Journal article

C2 - 32220978

AN - SCOPUS:85082480288

VL - 187

JO - Veterinary Record

JF - Veterinary Record

SN - 0042-4900

IS - 4

M1 - 153

ER -