Infrared thermography or rectal temperature as qualification for targeted metaphylaxis in newly received beef steers and the effects on growth performance, complete blood count, and serum haptoglobin during a 42-day feedlot receiving period*
dc.creator | Smock, Taylor M. (TTU) | |
dc.creator | Broadway, P. Rand | |
dc.creator | Burdick Sanchez, Nicole C. | |
dc.creator | Carroll, Jeffery A. | |
dc.creator | Hoffman, Ashley A. (TTU) | |
dc.creator | Long, Nathan S. (TTU) | |
dc.creator | Manahan, Jeff L. (TTU) | |
dc.creator | McDaniel, Zach S. (TTU) | |
dc.creator | Theurer, Miles E. | |
dc.creator | Wells, Jim E. | |
dc.creator | Hales, Kristin E. (TTU) | |
dc.date.accessioned | 2023-08-17T17:23:49Z | |
dc.date.available | 2023-08-17T17:23:49Z | |
dc.date.issued | 2023 | |
dc.description | © 2023 None | |
dc.description.abstract | Objective: The objective was to evaluate rectal tem- perature and infrared thermography as qualification for targeted metaphylaxis, and effects on clinical health, growth performance, complete blood count, and serum haptoglobin in newly received beef steers during a 42-d feedlot receiving period. Materials and Methods: Crossbred beef steers (n = 240; arrival BW = 258 ± 22.5 kg) were used. Experimental treatments were arranged as a generalized complete block design: sterile saline (NCON); conventional metaphylaxis administered to all steers (CONV); targeted metaphylaxis administered to steers with rectal temperature ≥39.7°C (RECT); or targeted metaphylaxis administered to steers with ocular infrared temperature ≥39.7°C (EYE). Body weight and blood samples for quantification of complete blood count and serum haptoglobin were collected on d 0, 14, and 42 relative to metaphylaxis. Results and Discussion: Metaphylaxis was adminis- tered to 0% of NCON, 100% of CONV, 48.9% of RECT, and 48.6% of EYE steers (P < 0.01). Therapeutic bovine respiratory disease (BRD) treatment rate did not differ (P = 0.16), although overall BRD treatment rate was minimal. Metaphylaxis was 62.5% of total active antimicrobial compound administered to RECT and 32.1% of total ac- tive antimicrobial compound administered to EYE. Both methods of targeted metaphylaxis decreased percentage of animals administered antimicrobials relative to CONV (P < 0.01), but total milligrams of active drug compound administered was not different (P = 0.65). Body weight, DMI, DMI as percentage of BW, and G:F did not differ at any time point (P ≥ 0.07). A tendency (P = 0.06) was observed for ADG from d 0 to 14, where CONV was greatest, RECT and EYE were intermediate, and NCON was least. Day 0 to 42 ADG was greatest in CONV and RECT, least in NCON, and intermediate in EYE (P < 0.01). Platelet count tended (P = 0.10) to be greatest in NCON and RECT, followed by EYE and CONV. No further hematologic treatment differences were observed (P ≥ 0.22). Implications and Applications: Overall BRD morbidity was unexpectedly low in the present study. Both methods of targeted metaphylaxis decreased the propor- tion of animals administered antimicrobials relative to conventional metaphylaxis; however, total milligrams of active drug compound administered was not different. The ADG of steers administered targeted metaphylaxis based on rectal temperature did not differ from those ad- ministered conventional metaphylaxis. Use of targeted metaphylaxis with measures of body temperature may decrease the proportion of animals administered metaphylaxis while maintaining optimal health and growth perfor- mance outcomes. | |
dc.identifier.citation | Smock, T.M., Broadway, P.R., Burdick, Sanchez, N.C., Carroll, J.A., Hoffman, A.A., Long, N.S., Manahan, J.L., McDaniel, Z.S., Theurer, M.E., Wells, J.E., & Hales, K.E.. 2023. Infrared thermography or rectal temperature as qualification for targeted metaphylaxis in newly received beef steers and the effects on growth performance, complete blood count, and serum haptoglobin during a 42-day feedlot receiving period*. Applied Animal Science, 39(4). https://doi.org/10.15232/aas.2022-02370 | |
dc.identifier.uri | https://doi.org/10.15232/aas.2022-02370 | |
dc.identifier.uri | https://hdl.handle.net/2346/95641 | |
dc.language.iso | eng | |
dc.subject | bovine respiratory disease | |
dc.subject | feedlot cattle | |
dc.subject | metaphylaxis | |
dc.subject | receiving period | |
dc.title | Infrared thermography or rectal temperature as qualification for targeted metaphylaxis in newly received beef steers and the effects on growth performance, complete blood count, and serum haptoglobin during a 42-day feedlot receiving period* | |
dc.type | Article |
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