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The distribution and morphology of fibrous astrocytes in the cervical spinal cord of normal horses and horses with chronic compressive myelopathy were demonstrated using immunohistochemical staining for glial fibrillary acidic protein. In the spinal cord from normal horses, astrocytes with stellate cell bodies and short processes were irregularly distributed in grey matter. In the white matter, their cell bodies were small and angular in areas adjacent to grey matter and larger and more stellate-shaped in the subpial area. Astrocyte processes were fine, and evenly distributed in a predominantly radial pattern in transverse sections of cord. Gliosis was marked in the spinal cords of horses with cervical compressive myelopathy. In the grey matter at the level of compression astrocytes were often enlarged and rounded, with short, blunt processes, but the gliosis was generally mild. In the white matter, gliosis was obvious in areas of nerve fibre swelling and degeneration at the level of compression and in areas of ascending and descending Wallerian degeneration. The fine radial pattern of astrocyte fibres was replaced by a dense, irregular arrangement. Gliosis persisted in the cords of chronically affected horses after active nerve fibre degeneration had subsided. The areas of gliosis coincided with the areas of Marchi staining for degenerating myelin and with areas of myelin loss in osmium tetroxide post-fixed tissue. Histological observations were consistent with astrocytes replacing areas of extracellular space that remained after nerve fibre degeneration. it is concluded that astrocytic gliosis is a prominent and persistent alteration of the spinal cord of horses with chronic cervical compressive myelopathy. 相似文献
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JOHN V. YOVICH bsc bvms A. S. TURNER bvsc ms Diplomateacvs F. W. SMITH bsme msme PhD D. M. DAVIS bs 《Veterinary surgery : VS》1986,15(1):55-59
Comparison was made of the holding power of orthopedic screws inserted self-tapped or after pre-tapping in foal bone. Third metacarpal and metatarsal bones were used. Comparative trials were made between screws inserted at the same site in the corresponding bones from the contralateral limbs of the same foal. A MTS servohydraulic tensile testing machine was used to perform screw pullouts at a displacement rate of 19 mm/sec. The 5.5 mm cortical screws had significantly greater holding power than 6.5 mm cancellous screws when both were inserted self-tapped (p = 0.0056). Pre-tapped insertion of 5.5 mm screws produced a significantly greater holding power than self-tapped insertion of 5.5 mm screws (p = 0.018). Pre-tapped insertion of 6.5 mm screws produced a significantly greater holding power than self-tapped insertion of 6.5 mm screws (p = 0.0000). In internal fixation of fractures in foals, insertion of 5.5 mm and 6.5 mm screws pre-tapped in metaphyseal bone is recommended because it produces greater holding power than self-tapped insertion. 相似文献
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OAT Peltoniemi A Tast M Heinonen J Oravainen C Munsterhjelm O Hälli C Oliviero P Hämeenoja JV Virolainen 《Reproduction in domestic animals》2010,45(6):1008-1014
The effect of ad libitum (ADLIB) feeding strategy on the fertility of the group housed sow was studied in a prospective field trial during 1.5 years. All study animals farrowed under standard farrowing circumstances in crates, and they were provided with an ad libitum feeding throughout the 30‐day lactation. After weaning, animals were randomly allocated to one of the two dry sow feeding strategies (AD LIB or CONT). After oestrus detection in groups, they were artificially inseminated and moved into pregnancy pens with partially slatted floor, in groups of 40 sows each. The ADLIB sows (n = 447) were loose housed and provided with ad libitum access to 7.7 MJ/kg feed high in fibre from two feeders per group. The control sows (n = 479; CONT) were also loose housed and given a standard dry sow feed in feeding stalls once a day (2.5 kg/day. The energy content of the feed was 9.3 MJ/kg NE). The feeding strategy (ADLIB vs CONT) had no effect on pregnancy rate (85.8 vs 90.9, p > 0.05), weaning to oestrus interval (7.7 vs 7.3 days, p > 0.05), piglets born alive (11.5 ± 3.5 vs 11.6 ± 3.3, p > 0.05), stillborn piglets (1.2 ± 1.8 vs 0.9 ± 1.5, p > 0.05) nor on progesterone concentration (p > 0.05). CONT sows weaned more piglets (9.7 ± 2.2 vs 9.4 ± 2.0, p < 0.01), whereas the piglets of AD LIB sows were heavier at weaning (8.8 ± 0.9 vs 8.0 ± 1.3 kg, p < 0.05). In conclusion, ad libitum feeding with a high in fibre diet during pregnancy did not affect the reproductive performance. 相似文献
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毛皮动物一般指那些能提供高档裘皮产品的动物,属于野生或经过人工驯化饲养的哺乳类动物。作者对毛皮动物的栖息环境、采食习性、行为等野生习性及驯化的关键问题和方法进行了综述。 相似文献
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Fractures of the distal phalanx in horses 总被引：1，自引：0，他引：1
Summary. Nineteen cases of fracture of the distal phalanx in horses are reviewed. This represented 1.1% of the total number of horses seen at Murdoch University Veterinary Hospital (MUVH) over a 32-month period. All horses were managed conservatively. Eight horses made a complete recovery. Three are being trained again and are not lame. Four horses made a limited recovery. Two horses are still resting and one horse was killed humanely when it still showed lameness after 2 years. One horse was killed humanely after the fracture was first diagnosed. 相似文献