scholarly journals A comparision of horn quality of the white line in the domestic horse(Equus caballus)( and the Przewalski horse (Equus przewalski)

1996 ◽  
Vol 12 (4) ◽  
pp. 641-645 ◽  
Author(s):  
K D Budras ◽  
C Schiel
Keyword(s):  
Equus Caballus ◽  
Domestic Horse ◽  
White Line ◽  
Przewalski Horse

Equus caballus (Domestic horse)

1967 ◽  
pp. 131-133
Author(s):  
T. C. Hsu ◽  
Kurt Benirschke
Keyword(s):  
Equus Caballus ◽  
Domestic Horse

Characterization of the domestic horse (Equus caballus) karyotype using G-and C-banding techniques

1976 ◽  
Vol 32 (9) ◽  
pp. 1146-1149 ◽  
Author(s):  
R. A. Buckland ◽  
Judith M. Fletcher ◽  
Ann C. Chandley
Keyword(s):  
Equus Caballus ◽  
Domestic Horse ◽  
C Banding

154 REPRODUCTIVE SEASONALITY AND FOLLICULAR DYNAMICS IN THE PRZEWALSKI'S HORSE

2009 ◽  
Vol 21 (1) ◽  
pp. 176
Author(s):  
C. W. Collins ◽  
S. L. Monfort ◽  
M. M. Vick ◽  
R. B. Weiss ◽  
D. E. Wildt ◽  
...  
Keyword(s):  
Sperm Motility ◽  
Repeated Measures ◽  
Sperm Concentration ◽  
Domestic Horse ◽  
Dominant Follicle ◽  
Isolated Populations ◽  
Genetic Management ◽  
Endowment Fund ◽  
Przewalski Horse ◽  
Follicular Dynamics

Artificial insemination has served as a valuable tool for the genetic management of small, isolated populations of several wildlife species (Pukazhenthi B et al. 2004 Development 16, 33–46). The overall aim of the present project was to develop a successful protocol for AI in the Przewalski horse (Equus ferus przewalskii), which is formally listed on the IUCN Red List as “extinct in the wild.” Achieving the long-term goal requires a series of requisite studies to improve our fundamental understanding of reproductive biology in this rare species of equid; therefore, our specific objectives in the present project were to (1) characterize ejaculate traits and examine the influence of seasonality in stallions; and (2) determine the follicular dynamics in mares. Stallions (n = 7) were anesthetized and subjected to a standardized electroejaculation procedure (Collins CW et al. 2006 Anim. Reprod. Sci. 94, 46–49). Testicular volume (TTV) and seminal traits [total sperm concentration (TSC), and total (TM) and progressive sperm motility (PM)] were assessed once each season (winter, January to March; spring, April to June; summer, July to September; fall, October to December) for 1 year, with data analyzed by repeated-measures ANOVA. Mares (n = 8) were examined by ultrasonography in a specialized chute system 3 days/week during breeding season (April to June) over 3 years. At each examination, ovarian structures [size of the dominant follicle and presence of corpora lutea (CL)] were assessed. Values for total ejaculate volume (mean ± SEM, 33.0 ± 22.2 mL), sperm motility (TM, 58 ± 19%; PM, 49 ± 18%), and TSC (2.8 ± 0.3 × 109) were highly variable among individuals. Seasonality significantly (P < 0.05) influenced TSC, which was highest in summer (4.41 ± 0.09 × 109) compared with spring (2.7 ± 0.5 × 109), fall (1.7 ± 0.4 × 109), and winter (2.5 ± 0.4 × 109). Season had no influence on TTV or other seminal traits (P > 0.05), with motile sperm being recovered at all ejaculation attempts. Ultrasonography revealed that the reproductive cycle of the Przewalski mare was composed of two phases. The follicular phase (4.3 ± 2.2 days; range, 3 to 7) was characterized by the presence of one dominant follicle that grew at a rate of 2.9 ± 0.2 mm (range, 1–6 mm) per day and ovulated at a size of 43.8 ± 1.5 mm in diameter (range, 30–57 mm). The luteal phase was distinguished by the presence of a CL that was sustained and evident on the ovary for 12.2 ± 3.3 days (range, 9–15) before regression. In summary, the basic reproductive physiology of the Przewalski horse is comparable with the domestic horse, including the ability of stallions to retain year-round spermatogenesis and ovarian follicular dynamics (including number, size, and growth rate) in the mare. These data allow us to suggest that established protocols for AI in the domestic horse (including estrus induction) likely will have relevance to adapting this technology to the genetic management of the rare Przewalski horse. Morris Animal Foundation (Grant No. D07ZO-403), Sichel Endowment Fund, Smithsonian Endowment Fund, Animal Management staff at CRC and The Wilds.

Comparative Anatomy of the Nuchal Ligament Lamellae and Cervical Interspinous Ligament in Zebrines (Horse and Zebra) and Asinines (Donkey)

2020 ◽  
Author(s):  
Sharon May-Davis ◽  
Robert Hunter ◽  
Wendy Y. Brown
Keyword(s):  
Comparative Anatomy ◽  
Cervical Vertebrae ◽  
Equus Caballus ◽  
Dorsal Spine ◽  
Domestic Horse ◽  
Interspinous Ligament ◽  
Attachment Sites ◽  
Close Relatives ◽  
Nuchal Ligament

A recent study postulated the reduction in nuchal ligament lamellae attachments from C2-C7 to primarily C2-C5, occurred after domestication in modern horse (Equus caballus). It further identified that close relatives of E. caballus still retained the nuchal ligament lamellae from C2-C7, whether the equid was a zebrine or asinine. To date, the morphology of the attachment sites of the nuchal ligament lamellae to the cervical vertebrae between zebrines and asinines have not been investigated. In this study, zebrines were represented by domestic horse, Przewalski&rsquo;s horse, close descendants of Equus ferus ferus and zebra; asinines were represented by donkeys. Comparative anatomy revealed that in zebrines the nuchal ligament lamellae attached to the eminence of the cervical dorsal spines with triangular apertures between each attachment and when attached to C6 and C7, the apertures elongated dorsally. Furthermore, the cervical interspinous ligament attached to each cervical dorsal spine forming a ligamentous base to each aperture from C2-T1. In asinines, the findings revealed the nuchal ligament lamellae attached to the entire dorsal eminence including the cervical dorsal spines from C2-C7, and neither apertures nor cervical interspinous ligaments were present. These informative results may benefit studies involving equid biomechanics and Palaeontologists identifying individual cervical specimens.

scholarly journals Haemoparasites Status of Domestic Horse (Equus caballus) at two Polo Fields in South Southern Nigeria

2020 ◽  
Vol 15 (2) ◽  
pp. 47-51
Author(s):  
Ebenezer Amawulu ◽  
Eze Chinwe Nwa ◽  
Francis Godswisdom
Keyword(s):  
Equus Caballus ◽  
Domestic Horse ◽  
Southern Nigeria

The effects of weaning on the domestic horse (Equus caballus)

2008 ◽  
Vol 110 (1-2) ◽  
pp. 42-57 ◽  
Author(s):  
Natalie K. Waran ◽  
Nancy Clarke ◽  
Mark Farnworth
Keyword(s):  
Equus Caballus ◽  
Domestic Horse
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