Use of serum biomarkers to predict the development and severity of osteochondrosis lesions in the distal portion of the femur in pigs

Nolan. Z. Frantz Hill's Pet Nutrition Incorporated, 400 SW 8th St, Topeka, KS 66603.

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Kim G. Friesen Hill's Pet Nutrition Incorporated, 400 SW 8th St, Topeka, KS 66603.

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Gordon A. Andrews Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506.

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Michael D. Tokach College of Veterinary Medicine, Department of Animal Sciences and Industry, College of Agriculture

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Ryan M. Yamka Hill's Pet Nutrition Incorporated, 400 SW 8th St, Topeka, KS 66603.

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Tom L. Loughin Department of Statistics, College of Arts and Sciences, Kansas State University, Manhattan, KS 66506.

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Jim L. Nelssen College of Veterinary Medicine, Department of Animal Sciences and Industry, College of Agriculture

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Steve S. Dritz Food Animal Health and Management Center, Kansas State University, Manhattan, KS 66506.

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Abstract

Objective—To evaluate the use of serum biomarkers of cartilage and bone metabolism to predict the occurrence and severity of osteochondrosis (OC) lesions in the distal portion of the femur in growing swine.

Animals—71 gilts.

Procedures—At an abattoir, serum samples for analysis of 10 biomarkers indicative of cartilage and bone metabolism were obtained prior to processing of the pigs. The distal portion of each pig's left femur was directly examined and cut into longitudinal sections to evaluate the number and severity of abnormalities on the external surface, articular cartilage, and growth plate. Each specimen was categorized as with (n = 56) or without (15) OC, and an overall OC severity score was assigned to affected pigs. Logistic and linear regression analyses were performed to predict odds of OC on the basis of biomarker concentrations and predict the severity of OC values in affected pigs, respectively.

Results—Compared with values in unaffected pigs, serum concentrations of C-propeptide of type II collagen (CPII) and cartilage oligomeric matrix protein were significantly increased and concentrations of carboxy-terminal telopeptide of type II collagen 3/4-length fragment (C2C) and pyridinoline cross-links were significantly decreased in affected pigs. A 2-fold increase in CPII concentration increased the odds of pigs having OC by a factor of 97 (95% confidence interval, 6 to infinity). Changes in serum C2C concentration accounted for 49% of the variation in overall OC severity score.

Conclusions and Clinical Relevance—Assessment of serum biomarker concentrations may be useful in the diagnosis of OC and aid in reduction of lameness in swine herds.

Abstract

Objective—To evaluate the use of serum biomarkers of cartilage and bone metabolism to predict the occurrence and severity of osteochondrosis (OC) lesions in the distal portion of the femur in growing swine.

Animals—71 gilts.

Procedures—At an abattoir, serum samples for analysis of 10 biomarkers indicative of cartilage and bone metabolism were obtained prior to processing of the pigs. The distal portion of each pig's left femur was directly examined and cut into longitudinal sections to evaluate the number and severity of abnormalities on the external surface, articular cartilage, and growth plate. Each specimen was categorized as with (n = 56) or without (15) OC, and an overall OC severity score was assigned to affected pigs. Logistic and linear regression analyses were performed to predict odds of OC on the basis of biomarker concentrations and predict the severity of OC values in affected pigs, respectively.

Results—Compared with values in unaffected pigs, serum concentrations of C-propeptide of type II collagen (CPII) and cartilage oligomeric matrix protein were significantly increased and concentrations of carboxy-terminal telopeptide of type II collagen 3/4-length fragment (C2C) and pyridinoline cross-links were significantly decreased in affected pigs. A 2-fold increase in CPII concentration increased the odds of pigs having OC by a factor of 97 (95% confidence interval, 6 to infinity). Changes in serum C2C concentration accounted for 49% of the variation in overall OC severity score.

Conclusions and Clinical Relevance—Assessment of serum biomarker concentrations may be useful in the diagnosis of OC and aid in reduction of lameness in swine herds.

Contributor Notes

Address correspondence to Dr. Dritz (dritz@vet.ksu.edu).
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