Morphological characteristics of stallion spermatozoa

Dowsett, K. F.; Osborne, H. G.; Pattie, WA

doi:10.1016/0093-691x(84)90046-3

Cited by 29 publications

(11 citation statements)

References 4 publications

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“…The decrease in motility in the cooled semen in Foote extender may be attributed to changes in available energy or damage to elements of axoneme that may compromise progressive sperm motility without promoting high injury rate in the plasma membrane (Watson, 1995). The sperm motility and morphology were the characteristics that best correlated to fertility of the semen in some studies (Dowsett et al, 1984;Daels et al, 1991;Jasko et al, 1992). In addition, in another study (Johansson et al, 2008) a positive correlation between sperm viability by supravital test and sperm motility were observed in stallion semen.…”

Section: Resultsmentioning

confidence: 99%

Viability and fertility of cooled equine semen diluted with skimmed milk or glycine egg yolk-based extenders

et al. 2012

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-Two semen extenders were compared for their ability to maintain viability of horse semen during 24 hours of cold preservation, and for the pregnancy rate after artificial insemination. In the experiment 1, five ejaculates from three stallions were split-diluted in either a skimmed milk-based extender (Kenney extender) or a glycine egg yolk-based extender (Foote extender) and cooled at 6-8 °C for 24 hours. Semen samples stored in Kenney extender for 24 hours had higher motility and spermatic vigor compared with those stored in Foote extender. However, samples stored in Foote extender had higher number of reactive sperm by hypoosmotic test and greater viability by epifluorescence test compared with those in Kenney extender. In the experiment 2, 17 and 23 ejaculates from two stallions were split-diluted with Kenney extender and Foote extender. The sperm concentration in each extender was adjusted to 500 million viable sperms per insemination dose. Semen was cooled to 6-8 °C and stored for 24 hours. Seventy-four cycles of crossbred mares were inseminated with either semen diluted in Kenney extender or semen diluted in Foote extender. The pregnancy rate was higher from semen diluted in Kenney extender than that from semen in Foote extender (0.553 vs. 0.306). The Kenney extender is effective in preserving the motility, vigor and fertility of stallion semen after 24 hours of cold storage, whereas the Foote extender is not acceptable.

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Section: Resultsmentioning

confidence: 99%

Viability and fertility of cooled equine semen diluted with skimmed milk or glycine egg yolk-based extenders

et al. 2012

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“…Later, Kenney et al (1983) found that sperm concentration associated with normal sperm morphology and motility were the seminal characteristics that best explained variations in pregnancy rates obtained at the end of the breeding season. Similarly, Dowsett et al (1984) and Jasko et al (1990) have shown that motility and morphology were the most important factors for fertility results. On the other hand, Bielanski (1975) found that stallions with high levels of morphological abnormalities could have good fertility.…”

Section: Resultsmentioning

confidence: 99%

Physical and morphological characteristics of the first three jets of Pêga jackasses sperm-rich fraction

Carvalho

Filho

Palhares

et al. 2016

Arq. Bras. Med. Vet. Zootec.

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The first three jets of the sperm-rich fraction of Pêga jackasses were collected and assessed separately. Five fertile Pêga jackasses were used as semen donors and underwent fractionated semen collection, using an open model artificial vagina. The first three jets of the semen were collected separately and assessed for volume, sperm motility, vigor, concentration/mL of semen, and sperm morphology. These characteristics were compared between first, second and third jets and between jackasses. It was observed that the jet volume differed (P<0.05) between jackasses, although it was similar (P>0.05) between first, second and third jets. Sperm motility did not differ (P>0.05) between jets and jackasses. Vigor was similar (P>0.05) between jets of the same jackass, and only the first jet differed (P<0.05) between jackasses. The first, second and third jets of the sperm-rich fraction had decreased sperm concentrations (P<0.05) of 955.56, 725.56 and 280.56x 10 6 sperm/mL of semen, respectively. Sperm morphology differed between the first three jets only for the incidence of mid-piece defect, higher in the third one (4.26%), compared to the first (3.36%) and second (3.38%) ones. When comparing the morphological characteristics of the sperm-rich fraction between five jackasses, regardless of the jet, there were differences in the percentage of normal sperm, proximal cytoplasmic droplet, mid-piece and head defects.

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“…Differences between stallions in breeding results can be caused by differences in semen quality. The variation in semen quality explains over B0% the variatron in fertility (Jasko et al 1997 ate fertility in horses are e.g, foaling rate (per season or per cycle), per cycle pregnancy rate or the number of services per mare required to achieve a pregnancy (Dowsett et al 1984;Pickett et al 1987;. Other parameters for breeding performance of a stallion are the first cycle pregnancy rate or the first cycle non-return (into a next oestrus after insemination) rale (Brutn et al 1992, Heiskanen et al 1994van Buiten et al 1994).In contrast to other species, like the bovine and the porcine, which demonstrate a small variation in pregnancy rate, 68-720/o (Lansbergen et al 1996), and B5-9OoÄ (Colenbrander and Grooten 1991), respectively, there is a wide variation in first cycle pregnancy rates (35-65) for mares bred with diluted (unchilled or chilled) semen (Samper et al 1991, Heiskanen et al, 1994.…”

Section: Semen Quality and Fertilitymentioning

confidence: 99%

Pre-seasonal breeding evaluation of the stallion

Parlevliet¹

1999

PHK

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Fertility of the stallion js an essential factor in the success of a breeding operation as good semen quality is a prerequisite for a good breeding performance. Therefore, pre-seasonal evaluation of stallion reproductive performance is of importance. In the Netherlands almost all breeding associations require a breeding soundness evaluation before a stallion is registered as a breeding stallion. Each year more than 600 young (mostly three year-old) stallions are evaluated on reproductive characteristics as semen quality and external genital organs (testicles and epididymides). Criteria for acceptance of a stallion for breeding vary betlveen breeding associations Semen evaiuation prior to breeding has been proven to be a valuable test for predicting stallion fertility in the first breeding season. As a high number of mares (> 300) can be inseminated frorn one stallion insight in the semen production is necessary. Therefore, this production shouid be evaluated (for ten days)to estimate the daily sperm output (DSO)at the beginning of lhe breeding season. In an Al-program the semen can be used either localy, shipped to the mare owners place or to another stud farm. Shipment of semen requires an adequate storage procedure to ensure minimal loss of semen qualily. Semen can either be slored chilled (shod term) or frozen (long term). The quality of semen after storage is highly dependent on the quality of the semen before storage and will at best approximate, but never exceed the quality of fresh semen. Therefore the storage ability of chilled semen should also be tested at the beglnning of the breeding season. Then the management of the stallion can be adapted depending on the semen quality and the number of mares to be served to optimize breeding results and mlnimize costs.

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Morphological characteristics of stallion spermatozoa

Cited by 29 publications

References 4 publications

Viability and fertility of cooled equine semen diluted with skimmed milk or glycine egg yolk-based extenders

Viability and fertility of cooled equine semen diluted with skimmed milk or glycine egg yolk-based extenders

Physical and morphological characteristics of the first three jets of Pêga jackasses sperm-rich fraction

Pre-seasonal breeding evaluation of the stallion

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