Reproductive parameters of miniature stallions.
Abstract: Breeding soundness evaluation (BSE) of stallions is a routine component of stud farm practice. Guidelines for assessing satisfactory breeding potential have been developed using data derived from stallions of full-size breeds. In view of the increasing popularity of miniature stallions, knowledge of normal semen parameters of these stallions is important. Therefore, testicular measurements and semen parameters from 216 sexually rested miniature stallions were obtained. Semen was collected twice, 1.5 to 3 h apart, using an artificial vagina. Values were averaged over the 2 collections because of the sexual inexperience of the stallions. The smaller stallions (Group A, 72 to 86 cm; Group B, 87 to 96 cm) had smaller testicles (P<0.05), and Group A stallions had the lowest ejaculate volume (P<0.05) compared with Group C (97 to 104 cm) stallions. Thus, although there was no difference in the concentration of spermatozoa per milliliter between groups of stallions, Group A stallions had fewer total spermatozoa in their ejaculate than Group C stallions (4.31+/-0.47x10(9) vs. 5.41+/-0.30x10(9), P<0.05). Moreover, miniature stallions had smaller testicles and fewer total spermatozoa in their ejaculate than is commonly accepted as normal in full-size stallions. Average total scrotal width of miniature stallions was found to be 7.13, 7.38 and 7.95 cm for Groups A, B and C, respectively. The average total number of spermatozoa in the ejaculates of miniature stallions in this study was 4.94+/-0.22x10(9) cells, with 1.75+/-0.09x10(9) total normal, motile spermatozoa. When only stallions <96.5 cm in height were considered (conforming to requirements of the American Miniature Horse Association Registry), the average total number of spermatozoa in the ejaculates was 4.59+/-0.30x10(9) cells, with 1.70+/-0.11x 10(9) total normal, motile spermatozoa. Based on these findings, different criteria should be used to evaluate the potential breeding soundness of miniature stallions than are commonly applied to full-size stallions.
Publication Date: 2000-03-23 PubMed ID: 10729098DOI: 10.1016/S0093-691X(99)00078-3Google Scholar: Lookup
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- Journal Article
Summary
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This study examines the breeding parameters of miniature stallions, suggesting that because of differences in parameters such as testicular measurement and sperm count compared to full-sized stallions, separate evaluation criteria should be used for breeding purposes.
Study Objectives and Methods
- The goal of this research was to provide clear parameters for the evaluation of the breeding capabilities of miniature stallions. This need for specific guidelines is driven by the increasing popularity of these small-sized horses.
- The research involved collecting testicular measurements and semen data from 216 miniature stallions. This data was gathered through semen collection conducted twice per stallion, with the collection times spaced 1.5 to 3 hours apart.
- All collected data was then averaged across the two collections per stallion to adjust for the sexual inexperience of these horses.
Research Findings
- The stallions were divided into three groups according to their sizes, Group A (72 to 86 cm), Group B (87 to 96 cm), and Group C (97 to 104 cm).
- It was found that the smaller stallions (Groups A and B) had smaller testicles than the larger stallions (Group C).
- Stallions in Group A also had the lowest ejaculate volume compared to the other groups.
- Even though there was no significant difference in the concentration of sperm per milliliter between the different groups, Group A stallions had a lower total sperm count in their ejaculate than Group C.
- This research also found that miniature stallions collectively had smaller testicles and fewer total sperm in their ejaculate than what is typically considered normal for full-sized stallions.
- Average total scrotal width and total sperm count of each group were also calculated with results highlighting variation across the groups.
Conclusion
- The study highlights the significant variations in reproductive parameters between miniature and full-sized stallions. This provides crucial information for those involved in the breeding of miniature horses.
- These differences necessitate the development of unique evaluation criteria specifically for assessing the breeding soundness of miniature stallions. This new set of criteria should take into account the smaller testicular measurements and lower sperm counts typically found in these horses.
Cite This Article
APA
Paccamonti DL, Buiten AV, Parlevliet JM, Colenbrander B.
(2000).
Reproductive parameters of miniature stallions.
Theriogenology, 51(7), 1343-1349.
https://doi.org/10.1016/S0093-691X(99)00078-3 Publication
Researcher Affiliations
- Department of Herd Health and Reproduction, Faculty of Veterinary Medicine, University of Utrecht, The Netherlands.
MeSH Terms
- Animals
- Breeding
- Horses / anatomy & histology
- Horses / physiology
- Male
- Reproduction
- Semen / physiology
- Sperm Count
- Sperm Motility
- Spermatozoa / abnormalities
- Testis / anatomy & histology
Citations
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