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A Pilot Study of the Effects of Mycoplasma Ovipneumoniae Exposure on Domestic Lamb Growth And

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A Pilot Study of the Effects of Mycoplasma Ovipneumoniae Exposure on Domestic Lamb Growth And bioRxiv preprint doi: https://doi.org/10.1101/459628; this version posted November 1, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 1 Full title: 2 A pilot study of the effects of Mycoplasma ovipneumoniae exposure on domestic lamb growth and 3 performance. 4 5 Thomas E. Besser1*, Jessica Levy1, Melissa Ackerman2, Danielle Nelson1, Kezia Manlove3, Kathleen A. 6 Potter1, Jan Busboom4, Margaret Benson4 7 8 Short title: 9 Sub-clinical Mycoplasma ovipneumoniae infection 10 11 1 Department of Veterinary Microbiology and Pathology, Washington State University College of 12 Veterinary Medicine, Pullman WA, United States of America 13 2 Department of Veterinary Clinical Sciences, Washington State University College of Veterinary 14 Medicine, Pullman WA, United States of America 15 3 Department of Wildland Resources, Utah State University College of Natural Resources, Logan UT, 16 United States of America 17 4 Department of Animal Sciences, Washington State University College of Agricultural, Human, and 18 Natural Resource Sciences, Pullman WA, United States of America. 19 * Corresponding author 20 E-mail: [email protected] 1 bioRxiv preprint doi: https://doi.org/10.1101/459628; this version posted November 1, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 21 Abstract 22 Mycoplasma ovipneumoniae is a globally distributed pathogen that has been associated with 23 pneumonia in both domestic and wild Caprinae. It is closely related to M. hyopneumoniae, a respiratory 24 pathogen of swine that is associated with decreased growth rates of pigs as well as clinical respiratory 25 disease. In order to assess the effects of M. ovipneumoniae on lamb performance, we generated a 26 cohort of lambs free of M. ovipneumoniae by segregation of test negative ewes after lambing, then 27 compared the growth and carcass quality traits of M. ovipneumoniae-free and -colonized lambs from 28 weaning to harvest. Some signs of respiratory disease were observed during the feeding trial in both 29 lamb groups, but the M. ovipneumoniae-exposed group included more affected lambs and higher 30 average disease scores. At harvest, lungs of lambs in both groups showed few grossly visible lesions, 31 although the M. ovipneumoniae-exposed group did exhibit increased microscopic lung lesions (P<0.05). 32 In addition, M. ovipneumoniae exposed lambs produced lower average daily gains (P<0.05), and lower 33 yield grade carcasses (P<0.05) compared to those of non-exposed lambs. The results demonstrated the 34 feasibility of test and segregation for elimination of M. ovipneumoniae from groups of sheep and 35 suggested that this pathogen may impair lamb growth and productivity even in the absence of overt 36 respiratory disease. 37 2 bioRxiv preprint doi: https://doi.org/10.1101/459628; this version posted November 1, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 38 Introduction 39 The bacterium Mycoplasma ovipneumoniae was originally isolated and described from a 40 Australian sheep flock experiencing a high incidence of pneumonia in lambs [1]. Lesions associated with 41 the disease included proliferative interstitial pneumonia with septal and bronchiolar epithelial cell 42 hyperplasia and proliferation, with additional infiltration in some cases by lymphocytes or neutrophils. 43 This disease has since been observed to have a global distribution, a variable but generally low severity, 44 and has been variously termed enzootic pneumonia, chronic non-progressive pneumonia, or interstitial 45 pneumonia [2]. In severe cases, enzootic pneumonia may involve co-infection with multiple genetic 46 strain types of M. ovipneumoniae and also other bacterial respiratory pathogens, including prominently 47 Mannheimia haemolytica [3, 4]. Enzootic pneumonia has been associated with adverse effects on lamb 48 growth and productivity [5-9]. 49 M. ovipneumoniae is a member of the neurolyticum/hyopneumoniae subgroup of mycoplasmas, 50 which also includes M. hyopneumoniae of swine, M. dispar of cattle, and M. conjunctivae of sheep and 51 goats [10, 11]. M. hyopneumoniae is recognized as an important pathogen contributing to respiratory 52 disease and unthriftiness in pigs [12, 13]. The combined impacts of M. hyopneumoniae on respiratory 53 disease and impaired growth have led to the recent development and adoption of methods to eliminate 54 this pathogen from large swine herds through the use of breeding management combined with 55 antibiotic therapy [14, 15]. If the effects of M. ovipneumoniae on lamb growth and productivity are 56 similar to those of M. hyopneumoniae in swine, similar efforts at flock-level elimination of this pathogen 57 may be merited. 58 M. ovipneumoniae is widespread in US sheep operations. The USDA National Animal Health 59 Monitoring Service included diagnostics for M. ovipneumoniae in its Sheep 2011 survey of 450 US 60 domestic sheep operations [16]. Evidence of M. ovipneumoniae colonization was detected in 3 bioRxiv preprint doi: https://doi.org/10.1101/459628; this version posted November 1, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 61 approximately 90% of operations. M. ovipneumoniae has also recently been identified as the primary 62 pathogen initiating severe epizootics of pneumonia in bighorn sheep [17, 18]. Further complicating the 63 picture, M. ovipneumoniae may also be detected in the lungs of lambs in the absence of overt clinical 64 signs or grossly visible lesions of enzootic pneumonia [2, 19]. These sub-clinical infections may also play 65 a role in impaired lamb growth and productivity that would not be detected in studies that rely solely on 66 grossly visible lung lesions as a marker for infection. 67 While previous studies of enzootic pneumonia have generally compared groups of lambs that 68 differed in the extent of grossly visible lung lesions, our approach was designed to evaluate the effects 69 of M. ovipneumoniae infection regardless of the extent of visible pneumonia lesions. Therefore, the 70 objective of this study was to determine the feasibility of producing a cohort of lambs unexposed to M. 71 ovipneumoniae on an infected premises in order to evaluate the effects of M. ovipneumoniae infection 72 or colonization of domestic lambs from weaning to harvest. 73 Materials and Methods 74 Ethics statement 75 This study was carried out in accordance with the recommendations in the Guide for the Care 76 and Use of Laboratory Animals of the National Institutes of Health and in conformance with 77 United States Department of Agriculture animal research guidelines, under protocol #04482 approved 78 by the Washington State University Institutional Animal Care and Use Committee (WSU IACUC). Parts of 79 this study were conducted at the University of Idaho Sheep Center under that same Washington State 80 University IACUC protocol under a memorandum of understanding with the University of Idaho 81 Laboratory Animal Research office. 82 Animals and husbandry 4 bioRxiv preprint doi: https://doi.org/10.1101/459628; this version posted November 1, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 83 The study was conducted using lambs from a cross-bred production flock of approximately 100 84 ewes located at the University of Idaho Sheep Center. Carrier and non-carrier ewes were identified by 85 longitudinal testing using nasal swab samples tested by realtime polymerase chain reactions (PCR). After 86 lambing, lambs were supplemented with selenium and vitamin E (0.5 ml Bo-Se, Merck Animal Health, 87 Madison NJ) and carrier and non-carrier ewes with their lambs were separated and housed in non- 88 adjacent pens to prevent nose-to-nose contact. During this period, the pre-weaned lambs had access to 89 the feed available to the ewes, which consisted of a 50:50 mix of rolled corn and whole barley (1 90 kg/ewe/day) plus long-stemmed dairy-quality alfalfa hay (2 kg/ewe/day). At approximately 65 days of 91 age the lambs were weaned, weighed, and vaccinated with Clostridial CDT bacterin/toxoid. A second 92 dose of CDT vaccine was administered 30 d later during the feeding trial. 93 Microbiology 94 M. ovipneumoniae was detected in nasal swab and lung samples using realtime PCR. Swabs (BBL 95 CultureSwabEZ, Fisher Scientific, Waltham, MA) were serially inserted into both nares of each sampled 96 animal, replaced in the swab sheath, and maintained at 4C for up to 3 hrs before storage at -20C until 97 DNA extraction. At harvest, separate swabs from each principal bronchus (left, right, tracheal) were 98 handled and stored similarly. Swabs were eluted by vigorous agitation in 400 ul of phosphate-buffered 99 saline,
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