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Effects of intramammary infections on colostrum quality in Jersey cows.

E. M. Hist


Effects of intramammary infections on colostrum quality in Jersey cows.
E. M. Hist*, N. R. Hardy, K. M. Enger, B. D. Enger. The Ohio State University, OARDC Wooster, OH.

A high-quality colostrum with sufficient antibody concentrations is essential for immune health in the newborn calf. Colostrum is highly variable between cows and among quarters within a cow. Intramammary infections (IMI) often occur during the time of colostrum formation; however, it is unknown if these infections ultimately affect colostrum quality and antibody concentrations. The objective of this study was to determine if antibody concentrations in colostrum from infected mammary glands differed from uninfected. Colostrum was collected from 90 cows across 4 Ohio dairy farms within 12 h of calving. Colostrum samples were aseptically collected from all 4 quarters of the cow by farm personnel and refrigerated at −4�C. Within 24 h of collection, Brix degrees were quantified using a refractometer and samples were cultured to determine infection status. Of the 353 quarters sampled, 88 quarters had an IMI. Antibody concentrations were quantified and compared within cow when a comparison was available among a pair of rear or fore quarters, one infected and one uninfected. This resulted in 8 primiparous quarter pairs and 10 multiparous pairs to be evaluated by ELISA. Statistical analyses were performed in SAS using the MIXED procedure with infection status and parity included as fixed effects; cow nested within farm was a random effect. Overall, Brix degrees were greater in primiparous cows than multiparous (27.2 vs 24.3 � 1.2; P < 0.05). Infected quarters had lower Brix degrees than uninfected in multiparous cows (23.6 vs 25.1 � 1.0; P < 0.01), but this was not observed in primiparous cows. Of the paired samples, concentrations of IgG2 tended to be lower in multiparous cows than primiparous cows (2.9 vs 4.5 � 0.7mg/mL; P = 0.11). Concentrations of IgA, IgM, and IgG1 did not differ based on infection status or parity. Ultimately antibody concentrations were not highly influenced by infection status, but differences were seen between parity groups. These results indicate that variability in colostrum quality is more greatly influenced by factors other than infection status.

Keywords: antibody.

Biography: Erin is from Medina, Ohio and majoring in Animal Bioscience at Ohio State University. She has been involved in original research in dairy, swine, beef, and sheep and works with several commercial dairy operations in Ohio. Erin plans to attend graduate school in the Fall.