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Mycoplasma ovipneumoniae  is a globally distributed pathogen that has been associated with pneumonia in both domestic and wild Caprinae. It is closely related to  M .  hyopneumoniae , a respiratory pathogen of swine that is associated with decreased growth rates of pigs as well as clinical respiratory disease. In order to assess the effects of  M .  ovipneumoniae  on lamb performance, we generated a cohort of lambs free of  M .  ovipneumoniae  by segregation of test negative ewes after lambing, then compared the growth and carcass quality traits of  M .  ovipneumoniae- free and -colonized lambs from weaning to harvest. Some signs of respiratory disease were observed during the feeding trial in both lamb groups, but the  M .  ovipneumoniae- exposed group included more affected lambs and higher average disease scores. At harvest, lungs of lambs in both groups showed few grossly visible lesions, although the  M .  ovipneumoniae- exposed group did exhibit increased microscopic lung lesions ( P <0.05). In addition,  M .  ovipneumoniae  exposed lambs produced lower average daily gains ( P <0.05), and lower yield grade carcasses ( P <0.05) compared to those of non-exposed lambs. The results demonstrated the feasibility of test and segregation for elimination of  M .  ovipneumoniae  from groups of sheep and suggested that this pathogen may impair lamb growth and productivity even in the absence of overt respiratory disease.

A pilot study of the effects of Mycoplasma ovipneumoniae exposure on domestic lamb growth and performance