Serum Amyloid A Concentrations in Young Japanese Black Cattle: Relationship with Colostrum Intake and Establishing Cut-Off Concentrations
Urara Shinya | Osamu Yamato | Yuka Iwamura | Tomohiro Kato | Yuhei Hamada | Oky Setyo Widodo | Masayasu Taniguchi | Mitsuhiro Takagi
This study aimed to investigate the variations in serum amyloid A (SAA) concentrations and influencing factors in young Japanese Black (JB) cattle. The cut-off values were 18.5 mg/L, 17.7 mg/L, 14.4 mg/L, and 8.1 mg/L at 30–59, 60–89, 90–119, and 120–300 days of age, respectively. Calves that ingested colostrum had significantly higher SAA concentrations than those that did not. The SAA concentrations at 1–7 days of age showed no correlation with γ-glutamyltransferase, total protein, or globulin levels. A slight increase in mammary-associated amyloid A concentrations—a colostrum-derived SAA—was observed before and after colostrum intake on 1 day of age; however, a significant overall increase in SAA concentrations was noted. The reference values for the SAA concentration in 1-month-old calves also showed a gradual decline. These findings suggest that the elevated SAA concentrations in 1-month-old JB calves, similar to Holstein calves, are not due to absorption from colostrum but SAA is instead biosynthesized by the calves as a biological defense mechanism. The clinical application of SAA concentrations in JB calves after one month of age may contribute to improving calf productivity.
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