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Reproductive characteristics and semen quality in maiden Dutch Warmblood stallions
J M Parlevliet1, B Kemp, B Colenbrander
1Department of Herd Health and Reproduction, Faculty of Veterinary Medicine, University of Utrecht, The Netherlands.
Insights
Semen characteristics in Dutch Warmblood stallions vary significantly between ejaculates and breed lines. Heritability differences allow for selection based on semen quality, aiding breeding programs.
Area of Science:
- Equine Reproduction
- Animal Breeding
- Semen Analysis
Background:
- Dutch Warmblood stallions are a significant breed in equestrian sports.
- Understanding semen characteristics is crucial for effective breeding programs.
- Variability in semen quality can impact reproductive success.
Purpose of the Study:
- To assess semen characteristics and testicular size in 3-year-old maiden Dutch Warmblood stallions.
- To identify differences in semen quality between ejaculates, breed lines, and sire families.
- To evaluate the potential for selecting stallions based on heritable semen traits.
Main Methods:
- Studied 398 maiden Dutch Warmblood stallions (3 years old).
- Collected and analyzed two ejaculates per stallion, 1 hour apart.
- Measured testicular size, semen volume, sperm concentration, motility, morphology, and pH.
- Compared semen characteristics between breed types (riding vs. carriage) and among semi-siblings.
Main Results:
- Determined mean values for age, testicular size, and various semen parameters.
- Significant differences (P < 0.05) were observed between first and second ejaculates for multiple semen traits.
- Significant differences (P < 0.05) in semen characteristics existed between riding and carriage horse types.
- A significant sire effect (P < 0.05) was found for semen volume, motility, and sperm concentration.
Conclusions:
- Semen quality and quantity exhibit significant variability within Dutch Warmblood stallions.
- Differences in heritability for semen traits suggest potential for selective breeding.
- Selection based on semen characteristics can improve reproductive efficiency in this breed.
Abstract:
The semen characteristics and testicular size of 398 3-year-old maiden Dutch Warmblood stallions were studied during February and March. Mean values (+/- SD) of age (1030 +/- 88 days) and testicular size (9.8 +/- 0.9 cm) of the maiden stallions were determined as well as the following semen characteristics (mean of two ejaculates, taken 1 h apart): volume (65 +/- 26 ml), sperm concentration (2.061 +/- 1.685 x 10(8) ml-1), total number of spermatozoa (1.129 +/- 0.71 x 10(10)), percentage of progressively motile spermatozoa (68 +/- 9%), percentage of live spermatozoa with normal morphology (66 +/- 15%), total number of progressively motile morphologically normal spermatozoa (5.307 +/- 3.833 x 10(9)) and pH (7.5 +/- 0.2). The morphology of the spermatozoa was studied and data on the most common abnormalities are presented. The first and second ejaculates show significant differences (P < 0.05) in volume, motility, number of spermatozoa, sperm morphology, total number of progressively motile morphologically normal spermatozoa and pH. The original breed has been split up into two different lines. There was a significant difference (P < 0.05) in semen characteristics between the types (riding and carriage horses). The semen quality and quantity of semi-siblings were compared and a significant sire effect (P < 0.05) was shown for the following characteristics: volume, motility (%) and sperm concentration. These results indicate that there are differences of heritability of those factors, which makes it possible to select on semen quality.