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Caceres S, Moreno J, Crespo B, Silvan G, Illera JC. Physiological Stress Responses in Cattle Used in the Spanish Rodeo. Animals (Basel) 2023; 13:2654. [PMID: 37627445 PMCID: PMC10451956 DOI: 10.3390/ani13162654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/09/2023] [Accepted: 08/16/2023] [Indexed: 08/27/2023] Open
Abstract
Certain events can cause distress in cattle. In Spain, there is a sport similar to rodeo called persecution and takedown, in which calves are harassed and knocked down by riders. In this study, the physiological stress response of calves (n = 260) is assessed by measuring hormonal physiological parameters. Salivary samples were collected from Salers (n = 110) and Lidia (n = 150) calves before, during, and after the persecution and takedown event. The hormones epinephrine, cortisol, serotonin, and dopamine were determined in saliva samples using enzyme-immunoassay techniques. The results obtained revealed that epinephrine and cortisol levels increased during the event in Salers calves, with a significant increase (p < 0.05) in the case of epinephrine, although after the event, these values returned to their initial state. Therefore, this sport supposes an assumable punctual stressor stimulus for the animal. In contrast, in Lidia calves, cortisol and epinephrine levels decreased, with a significant decrease (p < 0.05) in the case of cortisol, which may be related to the temperament of this breed and facing a stressful situation in a different manner. This is confirmed by serotonin and dopamine levels that were altered in Lidia calves with respect to the other group studied. In conclusion, the sport of persecution and takedown produces a physiological response of adaptive stress assumable for the animals.
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Affiliation(s)
| | | | | | - Gema Silvan
- Department of Animal Physiology, Veterinary Medicine School, Complutense University of Madrid (UCM), 28040 Madrid, Spain; (S.C.); (J.M.); (B.C.); (J.C.I.)
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Rosa VBB, Dos Santos IFC, Souto LG, de Paiva Porto E, Pizzigatti D, Cholfe BF, de Almeida BFM, Patelli THC, Takahira RK. Effect of acupuncture on hematologic, muscular biomarkers, fibrinogen and serum lactate parameters in training rodeo bulls. Res Vet Sci 2023; 158:76-83. [PMID: 36940656 DOI: 10.1016/j.rvsc.2023.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 02/20/2023] [Accepted: 02/22/2023] [Indexed: 02/27/2023]
Abstract
The study aimed to evaluated the effects of acupuncture in rodeo bulls in training, by determining hematological variables, creatine kinase (CK), aspartate aminotransferase (AST), fibrinogen, and plasma lactate. Thirty adult healthy bulls, crossbred, were included in the study and randomly allocated into two groups of 15 animals, according to the use of acupuncture treatment for six months (GA) or not (GB). The variables were measured 30 min before (TP0) and 10 min (TP10min), 12 (TP12h), 24 (TP24h), 48 (TP48h), and 72 h (TP72h) after a single episode of jumping emulating rodeo exercise. The GB group showed variations in hemoglobin between TP0 and TP10min (p = 0.002) and TP0 and TP12h (p = 0.004), and the GA presented an increase in eosinophil values between TP0 and TP12h (p = 0.013) and TP0 and TP24h (p = 0.034). Leukopenia was observed in GB between TP10min and TP72h ((p = 0.008). The CK values were high (↑ 300 UI/l) after exercise until the TP24h, and decreased in TP48h, in both groups. The plasma lactate elevation was lower in the GA at TP10min (p = 0.011), TP12h (p = 0.008), TP72h (p < 0.001). The rodeo bulls submitted to acupuncture treatment showed smaller variations in hemogram, elevated eosinophils levels, and lower plasma lactate levels after exercise.
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Affiliation(s)
- Vitor Bruno Bianconi Rosa
- Departament of Animal Production and Veterinary, Northern Parana State University (UENP), Bandeirantes, Paraná, Brazil.
| | - Ivan Felismino Charas Dos Santos
- Departament of Veterinary Surgery and Animal Reproduction, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil; Rondônia Federal University (UNIR), Department of Veterinary Medicine, Rolim de Moura, Rondônia, Brazil.
| | - Letícia Gondim Souto
- Departament of Veterinary Clínic, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.
| | - Emília de Paiva Porto
- Departament of Animal Production and Veterinary, Northern Parana State University (UENP), Bandeirantes, Paraná, Brazil.
| | - Dietrich Pizzigatti
- Department of Equine, School of Veterinary, University of the Republic Uruguay, Montevideo, Uruguay
| | - Bruno Fornitano Cholfe
- Department of Veterinary Medicine, Unilago University, São José do Rio Preto, São Paulo, Brazil
| | | | | | - Regina Kiomi Takahira
- Departament of Veterinary Clínic, School of Veterinary Medicine and Animal Science, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil.
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Constant C, Marchionatti E, Desrochers A, Babkine M, Nichols S. Admission lactate concentration has predictive value for death or severe complications within 30 days after admission in cattle with long-bone fractures. J Am Vet Med Assoc 2022; 261:273-280. [PMID: 36434763 DOI: 10.2460/javma.22.04.0181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To determine the prognostic value of lactate concentration measurements at admission in cattle with long-bone fractures. ANIMALS 43 cattle with long-bone fractures between July 2016 and Dec 2018. PROCEDURES In this prospective cohort study, lactate concentration was measured in systemic venous blood and locally in capillary blood sampled from the fractured and contralateral limbs of cattle and assessed for outcome prediction. The cutoff value was determined by maximizing the Youden index from receiver-operating characteristic curves. Multivariable logistic regression was employed to verify whether higher lactate concentrations compared with the cutoff value were an independent risk factor for poor outcomes at 30 days or 3 years after admission. RESULTS Poor outcome was associated with higher capillary lactate concentration in the fractured limb (P < .001) and greater difference with systemic blood (P = .005). A cutoff value of lactate difference ≥ 2.4 mmol/L (sensitivity = 0.80; specificity = 0.965) between capillary lactate in the fractured limb and systemic blood was the best predictor of death ≤ 30 days after admission (P < .001). Multivariable analysis revealed that this cutoff value was an independent risk factor for 30-day and 3-year outcomes (P < .001). CLINICAL RELEVANCE Admission blood lactate concentration difference ≥ 2.4 mmol/L between the fractured limb and systemic blood was a robust and independent predictor of outcome for cattle of the present report. Lactate metabolism is locally impaired in fractured limbs of nonsurviving or at higher complication risk cattle, which may help identify patients at high risk for poor outcomes.
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Affiliation(s)
- Caroline Constant
- 1AO Research Institute Davos, Davos, Switzerland.,2Department of Clinical Sciences, Université de Montréal, St-Hyacinthe, QC, Canada
| | - Emma Marchionatti
- 2Department of Clinical Sciences, Université de Montréal, St-Hyacinthe, QC, Canada.,3Clinic for Ruminants, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - André Desrochers
- 2Department of Clinical Sciences, Université de Montréal, St-Hyacinthe, QC, Canada
| | - Marie Babkine
- 2Department of Clinical Sciences, Université de Montréal, St-Hyacinthe, QC, Canada
| | - Sylvain Nichols
- 2Department of Clinical Sciences, Université de Montréal, St-Hyacinthe, QC, Canada
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Lomillos JM, Alonso ME. Relación de los niveles de Testosterona con el comportamiento del Toro Bravo durante la Lidia. REVISTA CIENTÍFICA DE LA FACULTAD DE CIENCIAS VETERINARIAS 2022. [DOI: 10.52973/rcfcv-e32181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Diversos estudios relacionan la concentración plasmática de testosterona con un comportamiento agresivo del animal. En ellos se han estudiado diferentes especies animales, pero se desconoce cómo es esta relación en el toro de lidia, perteneciente a una raza bovina singular por su selección etológica hacia la agresividad. En este trabajo se analizó de forma objetiva el comportamiento en el ruedo de 302 machos adultos de la raza bovina de lidia. Se registraron 33 parámetros etológicos, el número y gravedad de las caídas experimentadas por el animal y el tiempo de las cuatro fases del espectáculo, para correlacionar dicha información con la concentración plasmática de testosterona. Los resultados mostraron diferencias en la media de concentración plasmática de testosterona entre ganaderías y entre las líneas genéticas de procedencia estudiadas en la muestra. Igualmente se constata una correlación positiva entre la concentración de testosterona y un grupo de ocho parámetros etológicos, que señalan ejercicio físico del animal; por otro lado se observó una correlación negativa con los parámetros etológicos: “sale suelto”, “querencia” y “tardea”, sinónimos de falta de casta, lo que podría indicar una correlación positiva entre la testosterona y la agresividad, como indica la bibliografía.
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Affiliation(s)
- Juan Manuel Lomillos
- Universidad Cardenal Herrera (CEU), Facultad de Veterinaria, Departamento de Producción y Sanidad Animal, Salud Pública Veterinaria, Ciencia y Tecnología de los Alimentos. Valencia, España
| | - Marta Elena Alonso
- Universidad de León, Facultad de Veterinaria de León, Departamento de Producción Animal. León, España
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Blood Biochemical Variables Found in Lidia Cattle after Intense Exercise. Animals (Basel) 2021; 11:ani11102866. [PMID: 34679884 PMCID: PMC8532696 DOI: 10.3390/ani11102866] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 09/22/2021] [Accepted: 09/27/2021] [Indexed: 11/16/2022] Open
Abstract
Simple Summary There are limited published data in cattle on blood biological variables in response to intense work or after significant physical exertion. Stress should be considered in addition to exercise in the Lidia breed due to their agonistic behavioral characteristics. Therefore, changes in blood biological variables in response to intense exercise and stress were evaluated. Specifically, 438 bulls of the Lidia breed were sampled after a bullfight in order to determine the concentrations of different blood variables. We found that most of the measured blood variables clearly increased. Thus, severe hyperglycemia and an increase in various enzymes (LDH, AST, GGT, ALT, and particularly CK) were observed. The increase in all these variables is justified by the mobilization of energy sources, tissue and muscle damage, and dehydration, due to intense exercise and stress. Abstract There are limited published data in the bovine species on blood biological variables in response to intense work or after significant physical exertion. Lidia cattle, in addition to their exercise components, have some behavioral agonistic features that make them more susceptible to stress. The bullfight involves stress and exercise so intense that it causes significant changes in some metabolic variables. The study objective was to evaluate changes in blood biological variables in response to intense exercise and stress. After the fight in the arena, and once the bulls were dead (n = 438), blood samples were taken, and some biochemical and hormonal variables were determined in venous blood. A descriptive analysis was performed using the Statistica 8.0. computer program. The mean (±s.d.) results obtained were: total protein (85.8 ± 10.8 g/dL), albumin (3.74 ± 4.3 g/dL), triglycerides (39.65 ± 0.16 mg/dL), cholesterol (2.44 ± 0.03 mmol/L), glucose (22.2 ± 9.6 mmol/L), uric acid (340 ± 80 µmol/L), creatinine (236.9 ± 0.4 µmol/L), urea (5.93 ± 1.27 mmol/L), LDH (2828 ± 1975 IU/L), CK (6729 ± 10,931 IU/L), AST (495 ± 462 IU/L), ALP (90 ± 33 IU/L), GGT (50 ± 34 IU/L), ALT (59 ± 35 IU/L), cortisol (117.5 ± 46.6 nmol/L), and testosterone (20.2 ± 23.8 nmol/L). Most of the measured variables clearly increased; thus, we found severe hyperglycemia and increases in LDH, AST, GGT, and ALT enzymes, particularly in CK. The increases in all these variables are justified by the mobilization of energy sources, tissue/muscle damage, and dehydration due to continued stress and intense exercise.
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Mota-Rojas D, Napolitano F, Strappini A, Orihuela A, Martínez-Burnes J, Hernández-Ávalos I, Mora-Medina P, Velarde A. Quality of Death in Fighting Bulls during Bullfights: Neurobiology and Physiological Responses. Animals (Basel) 2021; 11:2820. [PMID: 34679841 PMCID: PMC8532837 DOI: 10.3390/ani11102820] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 09/21/2021] [Accepted: 09/24/2021] [Indexed: 02/07/2023] Open
Abstract
During bullfights, bulls undergo physiometabolic responses such as glycolysis, anaerobic reactions, cellular oedema, splenic contraction, and hypovolemic shock. The objective of this review article is to present the current knowledge on the factors that cause stress in fighting bulls during bullfights, including their dying process, by discussing the neurobiology and their physiological responses. The literature shows that biochemical imbalances occur during bullfights, including hypercalcaemia, hypermagnesaemia, hyperphosphataemia, hyperlactataemia, and hyperglycaemia, associated with increased endogenous cortisol and catecholamine levels. Creatine kinase, citrate synthase, and lactate dehydrogenase levels also increase, coupled with decreases in pH, blood bicarbonate levels, excess base, partial oxygen pressure, and oxygen saturation. The intense exercise also causes a marked decrease of glycogen in type I and II muscle fibres that can produce myoglobinuria and muscular necrosis. Other observations suggest the presence of osteochondrosis. The existing information allows us to conclude that during bullfights, bulls face energy and metabolic demands due to the high intensity and duration of the exercise performed, together with muscular injuries, physiological changes, and high enzyme concentrations. In addition, the final stage of the bullfight causes a slow dying process for an animal that is sentient and conscious of its surroundings.
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Affiliation(s)
- Daniel Mota-Rojas
- Neurophysiology, Behavior and Animal Welfare Assessment, DPAA, Xochimilco Campus, Universidad Autónoma Metropolitana, Ciudad de México 04960, Mexico
| | - Fabio Napolitano
- Scuola di Scienze Agrarie, Forestali, Alimentari ed Ambientali, Università Degli Studi Della Basilicata, 85100 Potenza, Italy;
| | - Ana Strappini
- Animal Science Institute, Faculty of Veterinary Sciences, Universidad Austral de Chile, Valdivia 5090000, Chile;
| | - Agustín Orihuela
- Facultad de Ciencias Agropecuarias, Universidad Autónoma del Estado de Morelos, Cuernavaca 62209, Mexico
| | - Julio Martínez-Burnes
- Animal Health Group, Faculty of Veterinary Medicine, Universidad Autónoma de Tamaulipas, Ciudad Victoria 87000, Mexico;
| | - Ismael Hernández-Ávalos
- Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México (UNAM), State of Mexico 54714, Mexico; (I.H.-Á.); (P.M.-M.)
| | - Patricia Mora-Medina
- Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México (UNAM), State of Mexico 54714, Mexico; (I.H.-Á.); (P.M.-M.)
| | - Antonio Velarde
- IRTA, Animal Welfare Program, Veinat Sies S-N, 17121 Monells, Spain;
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Escalera-Valente F, Alonso ME, Lomillos JM, Gaudioso VR, Alonso ÁJ, González-Montaña JR. Effect of Intense Exercise on Plasma Macrominerals and Trace Elements in Lidia Bulls. Vet Sci 2021; 8:vetsci8060097. [PMID: 34205854 PMCID: PMC8228837 DOI: 10.3390/vetsci8060097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/21/2021] [Accepted: 05/26/2021] [Indexed: 11/17/2022] Open
Abstract
Minerals are inorganic substances present in all body tissues and fluids that directly or indirectly influence the maintenance of multiple metabolic processes and, therefore, are essential for the development of various biological functions. The Lidia bull breed may be considered an athlete, as during a bull fight it displays considerable physical effort of great intensity and short duration in a highly stressful situation. The objective of this study was to assess plasma minerals concentration (macro- and microminerals) in Lidia bulls after intense physical exercise during a bull fight. Plasma Ca, Mg, P, K, Na, Fe, Cr, Co, Ni, Cu, Zn, Se and Mo concentrations were measured in 438 male Lidia bulls. Ca, P and Mg were measured using a Cobas Integra autoanalyzer, while Na and K were determined by ICP-AES, and Fe, Cr, Co, Ni, Cu, Zn, Se and Mo were measured by ICP-MS. All macrominerals, (Ca: 2.96 ± 0.31, Mg: 1.27 ± 0.17, P: 3.78 ± 0.65, K: 7.50 ± 1.58, Na: 150.15 ± 19.59 in mmol/L), and Cr (1.24 ± 0.58), Ni (0.249 ± 1.07), Cu (22.63 ± 4.84) and Zn (24.14 ± 5.59, in μmol/L) showed greater mean values than the reported reference values in the published literature, while Co (0.041 ± 0.07), Se (0.886 ± 0.21) and Mo (0.111 ± 0.08, in μmol/L) values were lower than those reported for other bovine breeds. These increased concentrations could be justified mainly by muscle cell metabolism, hepatic need to provide energy, and intense dehydration and hemoconcentration by losses through sweat glands or urination.
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Affiliation(s)
| | - Marta E. Alonso
- Animal Production Department, Veterinary Faculty, University of León, 24071 León, Spain; (M.E.A.); (V.R.G.)
| | - Juan M. Lomillos
- Production and Animal Heath, Public Health Veterinary and Science and Technology of Food Department, Veterinary Faculty, Cardenal Herrera—CEU University, 46115 Valencia, Spain;
| | - Vicente R. Gaudioso
- Animal Production Department, Veterinary Faculty, University of León, 24071 León, Spain; (M.E.A.); (V.R.G.)
| | - Ángel J. Alonso
- Medicine, Surgery and Anatomy Veterinary Department, Veterinary Faculty, Campus de Vegazana, University of León, 24071 León, Spain;
| | - José Ramiro González-Montaña
- Medicine, Surgery and Anatomy Veterinary Department, Veterinary Faculty, Campus de Vegazana, University of León, 24071 León, Spain;
- Correspondence: ; Tel.: +34-987-2941214
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8
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Relationships Between Concentrations of Biological Variables in Eye Fluids and Blood After Exercise in Lidia Cattle. ACTA VET-BEOGRAD 2019. [DOI: 10.2478/acve-2018-0034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Lidia cattle are a heterogeneous Iberian cattle population known for its natural aggressiveness and resistance to traditional handling procedures making in vivo blood sampling and biological fluid collections extremely difficult. Blood variables are influenced by physical exertion and stressful situations; consequently, post-mortem blood analysis does not reflect basal concentrations for this species. Nevertheless, ocular fluids (aqueous and vitreous humour) maintain their stable composition after death and maybe could be used to estimate ante-mortem blood concentrations. So, 15 bulls which had fought (for 15-20 minutes) and, subsequently after death, blood, aqueous and vitreous humour were sampled. Total protein, albumin, triglycerides, uric acid, urea, AST, ALT, GGT, AP, CK, LDH, cholesterol, creatinine, glucose and lactate were measured. Statistical analysis and correlation coefficients between the three fluids were carried out. All variables showed high plasma concentrations of glucose, uric acid, LDH and CK, compared with normal bovine concentrations. Apart from urea, all plasma concentrations were greater than those found in ocular fluids. The measured enzymes activities were higher in the vitreous than in the aqueous humour, but only marked differences in uric acid, lactate, AP and AST were found. There was a significant correlation between creatinine in the plasma and aqueous humour, and between albumin and GGT in the plasma and vitreous humour. Glucose, creatinine and urea exhibit a high correlation between ocular fluids. All plasma concentrations were clearly modified, however ocular fluids do not seem affected, thus establishing important correlations between the blood and intraocular fluids.
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Hagenmaier JA, Reinhardt CD, Bartle SJ, Henningson JN, Ritter MJ, Calvo-Lorenzo MS, Vogel GJ, Guthrie CA, Siemens MG, Thomson DU. Effect of handling intensity at the time of transport for slaughter on physiological response and carcass characteristics in beef cattle fed ractopamine hydrochloride. J Anim Sci 2018; 95:1963-1976. [PMID: 28727025 DOI: 10.2527/jas.2016.0821] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The effects of handling intensity on the physiological response and carcass characteristics of feedlot cattle fed ractopamine hydrochloride were evaluated at the time of transport to slaughter. Eighty steers (BW = 668 ± 36 kg) representing 10 lots of similar breed, frame size, and degree of finish were blocked by lot, stratified by weight, and randomly assigned to 1 of 2 handling intensities (HI) over a 1,600 m dirt alley course: 1) low-stress handling (LSH) or 2) high-stress handling (HSH). For the LSH treatment, 4 penmates were kept at a walk with the use of a lead rider. For the HSH treatment, 4 penmates were kept at a minimum of a trot and received 2 applications of an electric prod (approximately 1 s per impulse) at 2 separate instances: first in the alley before post-handling sampling, and again during loading for transportation to the abattoir. Behavioral observations and physical indicators of stress were recorded a minimum of 1 h before handling (baseline), immediately after handling (POSTHAND), and while in lairage after a 200 km transport to the abattoir. Vital parameters were recorded at baseline and POSTHAND. Venous blood samples were collected via jugular venipuncture at baseline and POSTHAND, and mixed arterial and venous blood samples were collected during exsanguination at slaughter. Muscle tremors tended to be more prevalent in HSH cattle at POSTHAND ( = 0.10). The HSH cattle tended to have greater POSTHAND heart rate ( = 0.08); however, there was no effect of HI on POSTHAND respiration rate or rectal temperature ( 0.34). The HSH cattle had greater lactate, epinephrine, norepinephrine, cortisol, and glucose concentrations at POSTHAND ( ≤ 0.02). Additionally, HSH cattle had lower POSTHAND blood pH, bicarbonate, base excess, and partial pressure carbon dioxide ( < 0.0001). Bicarbonate concentrations were greater in HSH cattle at slaughter ( = 0.05); however, there were no differences between HI treatments for the remaining blood variables ( 0.11). Concentrations of stress hormones and CK were significantly greater at slaughter relative to baseline and POSTHAND for both LSH and HSH cattle ( < 0.001). These findings suggest cattle trotted without a lead rider develop metabolic acidosis, and illustrate the importance of low-stress handling at the time of transport for slaughter. Further research is warranted to develop strategies to mitigate stress at the time of transport and ensure the welfare of beef cattle presented to abattoirs.
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Buczinski S, Rademacher RD, Tripp HM, Edmonds M, Johnson EG, Dufour S. Assessment of L-lactatemia as a predictor of respiratory disease recognition and severity in feedlot steers. Prev Vet Med 2014; 118:306-18. [PMID: 25537763 DOI: 10.1016/j.prevetmed.2014.12.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 11/03/2014] [Accepted: 12/05/2014] [Indexed: 10/24/2022]
Abstract
The bovine respiratory disease complex (BRD) is a major health issue in feedlot cattle and one of the primary reasons for antimicrobial use in the North American feedlot industry. The purpose of the present study was to assess blood L-lactate levels of feedlot steers at high risk of developing BRD during the early feeding period. Blood samples were obtained at initial processing and again after BRD confirmation (using bronchial lavage or thoracic ultrasound exam). The study involved 232 recently weaned steers received at a single research feedlot that were processed without metaphylactic antimicrobial treatment. Blood samples were obtained for determination of L-lactatemia and temperament scores (very quiet or stoic [score 1], average [score 2] and very excited [score 3]) were systematically assigned at initial processing. A subsample of calves that were later confirmed as cases of BRD were sampled at first pull (day 0), and at subsequent observation points on days 3, 6, 9 and 15 following initial BRD diagnosis for blood lactate determination as a potential indicator of subsequent death. The clinical BRD cumulative incidence in the cohort was 38% (87/232). Temperament was associated with the probability of becoming a BRD case during the early feeding period. Stoic or very excited calves showed 2.2 times higher odds (95%CI: 1.3, 3.8) of becoming BRD cases compared to calves with average temperament. The impact of L-lactatemia differed by temperament strata. In calves with a temperament score of 2 (average temperament) every 1-log unit increase of lactatemia at processing resulted in 1.9 times higher odds (95% CI: 1.2, 3.1) of becoming a BRD case; this relationship was not significant in calves with a score of either 1 or 3. Twenty-nine confirmed BRD cases were studied for the dynamic lactate assessment analysis. L-lactate at first pull was not significantly different between survivors (median 3.3mmol/L; range 0.8-7.8mmol/L) and non-survivors (median 2.7mmol/L; range: 1.6-5.4mmol/L) steers. However, the dynamic assessment of L-lactatemia was associated with the hazard of death using Cox proportional hazard survival analysis. A 1-log increase of lactatemia increased the hazard of dying prior to the next observation by a factor of 36.5 (95% CI: 3.5-381.6). For calves showing a normal temperament score (i.e. temperament score of 2), a misclassification cost term analysis was conducted to identify potential L-lactate test thresholds for identifying future BRD steers. When planned test usage was for informing decision of administering or not a metaphylactic treatment at processing, experts agreed that false-negative (not treating a calf that would have benefit from treatment) to false-positive (wrongfully treating a calf that would have remained healthy) health costs ratio ranged from 8:1 to 20:1. In this situation, a threshold of 5mmol/L would have best informed treatment decision. When using L-lactate for informing the type of antimicrobial used at processing, false-negative to false-positive health costs ratio ranging from 1:1 to 3:1 could be expected and, again, a L-lactate threshold of 5.0mmol/L would have minimized the costs associated with calves' misclassification and could be used to identify calves that would benefit from a more efficient metaphylactic treatment. This study provides an interesting perspective on the potential application of chute-side markers or diagnostic tests to stratify the risk of future pull for BRD in cattle during processing in order to adapt antimicrobial treatments accordingly.
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Affiliation(s)
- S Buczinski
- Faculté de médecine vétérinaire, Université de Montréal, CP 5000, Saint-Hyacinthe, Québec J2S 7C6, Canada.
| | - R D Rademacher
- College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, United States
| | - H M Tripp
- Center for Veterinary Health Sciences, Oklahoma State University, Stillwater, OK 74078, United States
| | - M Edmonds
- Johnson Research LLC, Parma, ID, United States
| | - E G Johnson
- Johnson Research LLC, Parma, ID, United States
| | - S Dufour
- Faculté de médecine vétérinaire, Université de Montréal, CP 5000, Saint-Hyacinthe, Québec J2S 7C6, Canada
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