The influence of age and breed on stallion semen

Dowsett, K. F.; Knott, L. M.

doi:10.1016/0093-691x(96)00162-8

Cited by 91 publications

(65 citation statements)

References 12 publications

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“…Our observation that high stallion age and high mare age had a downward effect on fertility was parallel to the report of Langlois and Blouin (2004). Dowsett and Knott (1996) accordingly found lower semen quality in older than in younger stallions. Furthermore, we found that male fertility did not decrease with increasing age as rapidly as that of females, which is in accordance with Langlois and Blouin (2004).…”

Section: Discussionsupporting

confidence: 90%

Effects of inbreeding and other genetic components on equine fertility

Sairanen

Nivola

Katila

et al. 2009

Animal

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The Finnish mating records of Standardbred trotters (SB; n 5 33 679) and Finnhorses (FH; n 5 32 731) were analysed to study the effect of the level of inbreeding on foaling rates and to estimate the heritability of foaling rate. A linear mixed model was assumed, with the outcome of the foaling (foal or no foal) as the trait of the study. A restricted maximum likelihood-based method was used to calculate the estimates of the variance components. Predictions of breeding values and estimates of fixed effects were also calculated. The average level of inbreeding was 9.9% in the SB and 3.6% in the FH. The average foaling rates were better in the SB (72.6%) than in the FH (66.3%), but within each breed intense inbreeding had a statistically significant negative effect on foaling rate ( P , 0.05). Also, the mating type, the age and breeding type of the mare, and the age of the stallion had statistically significant effects on foaling rate ( P , 0.001). The heritability of foaling rate was between 3.4% and 3.7% in SBs and between 5.5% and 9.8% in FHs, when the outcome of the foaling was considered to be a trait of the expected foal. With the same model, the estimates of maternal genetic effect were 4.7% for SBs and 3.2% for FHs, and the estimates of the permanent environmental effects of the stallion were between 1.3% and 1.7%. Avoiding matings with very high inbreeding coefficients would improve foaling rates. It would also be possible to devise a breeding program for better equine fertility, but because the heritability is low, improvement of environmental factors deserves special attention.

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Section: Discussionsupporting

confidence: 90%

Effects of inbreeding and other genetic components on equine fertility

Sairanen

Nivola

Katila

et al. 2009

Animal

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“…Results show that the stallion significantly influenced all parameters evaluated in raw and coldstored semen. The large individual differences observed in semen quality correspond with findings in other horse breeds [9,10]. For the Icelandic stallions used in this study, values for mean ejaculate volume, sperm concentration, total sperm count and sperm motility were 43.4 mL, 193.0 x 10 6 /mL, 6.7…”

Section: Discussionmentioning

confidence: 71%

“…In one study [9] performed with 168 stallions of 9 different breeds, the mean values for volume, concentration, total sperm count and sperm motility were 33.7 mL, 164.1 x 10 6 /mL, 6.3 x 10 9 and 76.4%. However, it is difficult to directly compare the results of different studies with varying study groups as it is known that breed [9,10], age [9], season of semen collection [10,11] as well as duration of sexual rest [11,12] may influence semen quality. To test the suitability of Icelandic stallions for the production of chilled semen, ejaculates were processed with 4 different extenders with and without removal of seminal plasma by centrifugation.…”

Section: Discussionmentioning

confidence: 99%

Quality of Raw and of Cold-Stored Semen in Icelandic Stallions

Janett¹,

Sacher²,

Hässig³

et al. 2012

Journal of Equine Veterinary Science

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The aim of the present study was to evaluate the quality of raw and cooled semen in Icelandic stallions. Experiments were performed using seven stallions aged between 3 and 19 years. From each stallion, six ejaculates were collected, and semen quality was determined. Thereafter, the semen was split into eight equal parts and processed with and without centrifugation using the extenders INRA 82-egg yolk, INRA 96, GENT, and Equi-Pro to a final concentration of 30 × 106 sperm/mL. The extended semen was then cooled in an Equitainer, where it was stored for 24 hours, and subsequently refrigerated for another 24 hours at 5°C. Immediately after dilution as well as after 24 and 48 hours storage, sperm motility was analyzed using computer-assisted sperm analyzer, and viability was assessed after dual DNA staining with SYBR-14 in combination with propidium iodide. The results show that the stallion had a significant (P < .05) influence on all variables evaluated in raw semen, and mean (±SEM) values of 43.4 ± 4.3 mL for the volume, 193.0 ± 17.0 × 106 sperm/mL for the concentration, 6.7 ± 0.5 × 109 for total sperm and 73.5 ± 2.1% for total sperm motility, 48.7 ± 2.0% for progressive motility, and 65.3 ± 2.0% for rapid cells were measured. In the cold-stored semen, all variables were significantly (P < .05) influenced by the stallion, extender, and storage time (48 hours). Except for Equi-Pro, all extenders examined were suitable for cooled semen preservation. For storage of more than 24 hours, centrifugation and removal of the seminal plasma were advantageous for all extenders with the exception of Equi-Pro. AbstractThe aim of the present study was to evaluate the quality of raw and cooled semen in Icelandic stallions. Experiments were performed using 7 stallions aged between 3 and 19 years. From each stallion 6 ejaculates were collected and semen quality determined. Thereafter, the semen was split into 8 equal parts and processed with and without centrifugation using the extenders INRA 82-egg yolk, INRA 96 TM , GENT TM and Equi-Pro TM to a final concentration of 30 x 10 6 sperm/mL. The extended semen was then cooled in an Equitainer TM , where it was stored for 24 h, and subsequently refrigerated for another 24 h at 5 °C. Immediately after dilution as well as after 24 and 48 h storage, sperm motility was analyzed using CASA and viability assessed after dual DNA staining with SYBR-14 in combination with propidium iodide. The results show that the stallion had a significant (P < 0.05) influence on all variables evaluated in raw semen and mean (±SEM) values of 43.4±4.3 mL for the volume, 193.0±17.0 x 10 6 sperm/mL for the concentration, 6.7±0.5 x 10 9 for total sperm and 73.5±2.1% for total sperm motility, 48.7±2.0% for progressive motility and 65.3±2.0% for rapid cells were measured. In the cold-stored semen, all variables were significantly (P<0.05) influenced by the stallion, extender and storage time (48 h). Except for Equi-Pro TM , all extenders examined were suitable 2 for cooled semen preservation. For stora...

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“…This is the case for age: this effect has been documented for a long time [32][33][34][35], and is generally admitted in all studies [6,20,[36][37][38][39][40][41][42][43][44][45][46][47][48]. The curves here are the first that give such a precision on the evolution of fertility with the age of mares and stallions.…”

Section: Discussionmentioning

confidence: 96%

Statistical analysis of some factors affecting the number of horse births in France

Langlois

Blouin

2004

Reprod. Nutr. Dev.

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-Declarations of matings (535 746) and 308 549 consecutive declarations of birth from 1989 to 1999 were analysed by logistic regression in order to determine the effects of year, breed and age of parents on numerical productivity (the number of foals declared per mated mare per year). For the years 1994 to 1999, the status of the mare, type of mating and month of first mating, were also available. The effect of inbreeding and, for warm-blooded horses, the effect of the level of performances or the effect of the level of breeding value estimation were also analysed. The main results are the following: numerical productivity progressed in France more for draught breeds than for saddle breeds and trotters. Thoroughbreds progressed less and just reached the level of significance. Cold-blooded horses, however, appeared less productive than warm-blooded horses for which thoroughbreds were at the lower level. It cannot be concluded if this figure reveals biological differences in fertility or if it is only the result of differences in managing the official declarations. For warm-blooded horses, the absence of negative relationships between the trends of selection and numerical productivity results appeared clearly. A high performance level for the mare was positively associated with higher productivity results in sport and trotting horses and showed no significant influence for galloping horses. The relationships with breeding value estimation illustrated the same trends.horse / fertility / logistic model / factors of variation / selection / inbreeding

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The influence of age and breed on stallion semen

Cited by 91 publications

References 12 publications

Effects of inbreeding and other genetic components on equine fertility

Effects of inbreeding and other genetic components on equine fertility

Quality of Raw and of Cold-Stored Semen in Icelandic Stallions

Statistical analysis of some factors affecting the number of horse births in France

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