72 Immunoglobulin subclasses in colostrum and plasma of Quarter Horse mares and foals fed diets with or without added probiotics

It is dangerous for both riders and horses when a horse suddenly startles. Sometimes horses do this in familiar environments because familiar objects may look different when rotated. The purpose of this study was to determine whether horses that had been habituated to a complex object (children’s playset) would react to the object as novel when rotated 90 degrees. Twenty young horses were led past the playset 15 times by a handler. Next, the rotated group was led past the rotated playset 15 times. Each time the horse was led by the object was a pass. The behavioral responses observed and analyzed were ears focused on the object, nostril flares, neck raising, snort, avoid by stopping, avoid by moving feet sideways, and avoid by flight. An increasing reactivity scale was used to quantify behavioral responses. A two-sample t-test was performed on the reactivity scores comparing the first pass by the novel object to the first pass by the rotated object. The horses in the rotated group reacted to the rotated orientation similarly to the first exposure (p = 0.001, α < 0.05). Being aware of potential reactions to changes in previously familiar environments can help keep the handler safer.

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Streptococcus pluranimalium meningoencephalitis in a horse

Journal of Veterinary Diagnostic Investigation ◽

10.1177/10406387211023465 ◽

2021 ◽

pp. 104063872110234

Author(s):

Dah-Jiun Fu ◽

Akhilesh Ramachandran ◽

Craig Miller

Keyword(s):

Ribosomal Rna ◽

Cross Sections ◽

Nucleotide Sequencing ◽

Formalin Fixed Paraffin ◽

Quarter Horse ◽

Formalin Fixed Paraffin Embedded ◽

History Of ◽

The Brain ◽

Gram Positive Cocci ◽

Formalin Fixed

A 3-y-old, female Quarter Horse with a history of acute neurologic signs was found dead and was submitted for postmortem examination. Areas of petechial and ecchymotic hemorrhage were present on cross-sections of the cerebrum, cerebellum, and brainstem. Histologic examination of the brain revealed severe, purulent meningoencephalitis and vasculitis with a myriad of intralesional gram-positive cocci. Streptococcus pluranimalium was identified from formalin-fixed, paraffin-embedded tissue obtained from sites with active lesions by PCR and nucleotide sequencing of bacterial 16S ribosomal RNA. S. pluranimalium should be considered as a cause of meningoencephalitis in a horse.

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Chronic interstitial pneumonia with features of organizing pneumonia in an adult horse

Journal of Veterinary Diagnostic Investigation ◽

10.1177/1040638720936251 ◽

2020 ◽

Vol 32 (4) ◽

pp. 621-625

Author(s):

Miguel F. Carrillo ◽

Deborah Kemper ◽

Leslie W. Woods ◽

Francisco R. Carvallo

Keyword(s):

Connective Tissue ◽

Interstitial Pneumonia ◽

Bacterial Pneumonia ◽

Organizing Pneumonia ◽

Respiratory Problems ◽

Nodular Pattern ◽

Quarter Horse ◽

History Of ◽

Alveolar Septa ◽

Formalin Fixed

A 22-y-old American Quarter Horse gelding was presented with a history of chronic progressive respiratory problems and a diffuse pulmonary nodular pattern in thoracic radiographs. The horse was euthanized, and 4 formalin-fixed samples of lung were submitted for histopathology. There were multifocal areas of marked thickening of alveolar septa as a result of proliferation of myofibroblasts embedded in fibromyxoid matrix (interpreted as “Masson bodies”), focal areas of fibrosis, and numerous papillary projections of connective tissue into bronchioles. A diagnosis of organizing pneumonia was reached. No etiology was found for this lesion. It is important to consider causes of chronic interstitial pneumonia with fibrosis in horses other than equid herpesvirus 5, such as complicated viral or bacterial pneumonia or chronic toxicoses.

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