Evaluation of lung lesions using modified madec lung scoring system and its correlation with farm management practices

Thong, Jessamine Jiah Kher (2023) Evaluation of lung lesions using modified madec lung scoring system and its correlation with farm management practices. [Project Paper] (Submitted)

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Abstract

Lung scoring is commonly conducted in slaughterhouses to quantify lung lesions and gauge severity of respiratory diseases in clinically healthy finisher pigs. Two scoring systems, the Madec Lung Score (MLS) and the Modified Madec Lung Score (MMLS), are employed for this purpose. MLS divides a pig's lung into seven lobes, assigning scores ranging from 0 to 4 for each lobe based on lesion severity, with a maximum possible total score of 28 per lung. MMLS refines this approach by categorizing scores based on the percentage of the total lung volume affected by lesions, offering a more detailed evaluation. Both MLS and MMLS were used in this study on 429 commercial finisher pigs from 14 farms at the slaughterhouse, yielding a median score of 1-25%, signifying a common range of lesion severity. However, MLS exhibited a wider range of scores, including extreme scores reaching Madec 100%, indicating a larger variation in lesion severity assessments when using MLS. Conversely, MMLS provided more conservative and consistent range of scores with the highest reaching Madec 51-70%, suggesting a more precise evaluation of lung lesions. Bronchopneumonic lesions were negatively correlated with closed housing systems used for grower houses (r=-0.586, p<0.05), suggesting that closed housing practices may have a positive impact on lung health. The use of antibiotics in grower feed was strongly negatively correlated with affected surfaces in pneumonic lungs (r=-0.608, p<0.05), Madec50% (r=-0.618, p<0.05) and the E.P Index (r=-0.608, p<0.05), indicating that timely and adequate antibiotic dosage use during grower stages may be associated with reduced lung lesions at slaughter. Besides, lung scarring is strongly positively correlated with weaner bathing practices (r=0.537, p<0.05), suggesting that farms practising weaner bathings may have a negative impact on lung health and potentially contribute to lung scarring. Furthermore, lung scarring was moderately negatively correlated with higher mycoplasma vaccination age (r=-0.555, p<0.05) and PCV2 vaccination age (r=-0.555, p<0.05), suggesting that delaying vaccinations against both mycoplasma hyopneumoniae and PCV2 is associated with reduced lung scarring upon slaughter. The presence of cranial-ventral pleurisy is strongly negatively correlated with CSF vaccination at older age (r=-0.748, p<0.05), suggesting that delaying CSF vaccination may be associated with a reduced presence of cranial-ventral pleurisy. In conclusion, the use of MMLS is a useful tool for evaluation of lung lesions and results from this study emphasizes the importance of farm management practices and vaccination timing in influencing lung scoring outcomes in finisher pigs upon slaughter.

Item Type:	Project Paper
Faculty:	Faculty of Veterinary Medicine
Depositing User:	Ms. Nordeena Abdul Aziz
Date Deposited:	18 Nov 2024 08:25
Last Modified:	18 Nov 2024 08:25
URI:	http://psaspb.upm.edu.my/id/eprint/2150

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