Seminal Characteristics in Spanish Purebred Stallions: A Retrospective Study

Akourki, A.; Arantxa, Echegaray; Mitjana, Olga

doi:10.1016/j.jevs.2012.09.002

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…It is striking that the Chilean purebred does not show significant differences associated with age or time of the year, which can be considered a potential of the breed because it facilitates work with biotechnological purposes such as dose calculation and repetitiveness of results over the year. This characteristic is also present in the Spanish horse (Adamou et al 2013) from which the Chilean purebred horse descended directly (Perez and Huber 2004), although the percentage of sperm motility achieved by the Spanish horse is slightly higher. Moreover, in the Arab breed it is possible to recognise a decrease of up to 10% in the sperm motility of aged individuals (El-Maaty et al 2014).…”

Section: Discussionmentioning

confidence: 90%

“…To do this, it is necessary to create referential values for each breed, also considering that the andrological variables depend on domestication grade of each on of them, as well as the latitude and photoperiod of the geographic place where they reside (Pereira et al 2012). Thus, contradictory situations might be seen such as in Spanish stallions that surprisingly show higher spermatic concentration during winter (Adamou et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Andrological characterisation of Chilean purebred stallions

Castro

Morales

Miranda

2020

Austral j. vet. sci.

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Chilean purebred horses are widely used in Chile for rodeo and farm work. Despite the importance of the breed, systematic studies characterising their andrological variables are lacking, making stallion evaluation and selection difficult. This study aimed to determine whether age and seasonality affect seminal, spermatic, gonadal and endocrine variables of 15 Chilean purebred stallions. The animals were studied over a year and were separated into a young group (n=6) (5 to 12 years) and an aged group (n=9) (13 to 25 years). The variables evaluated were: total seminal volume (mL), free gel seminal volume (mL), sperm concentration (106 x spermatozoa/mL using Spermacue refractometer TM), sperm progressive motility (conventional microscopy (%)), sperm vitality (Eosine-Nigrosine stain (%)) and sperm morphology (Hematoxylin Eosin stain (%)), testicle volume (cm 3 ) (ultrasound Weld 3000V, 5MHz), plasmatic testosterone (ng/mL) and estrogen (pg/mL) concentration determined by radioimmunoassay. To determine the statistical difference and correlation between variables, ANOVA and Pearson's correlation were used, respectively (P<0.05). Most of the andrological variables were affected by age and season and although not significant, the values obtained were higher in young stallions during summer. Progressive motility (70 ± 12.1 %), sperm normal morphology (90 ± 1.7 %) and plasmatic estrogen (6.49 ± 1.8 pg/mL) reached statistical significance to plasmatic testosterone (0.3 ± 0.08 ng/mL) (P=0.01), sperm concentration (253 ± 59.5 x 106 sperm/mL) (P=0.03) and testicular volume (463.4 ± 90 cm3) (P=0.002) variables. Despite the results, we suggest that all these variables should be considered during stallion selection since andrological variables were neither correlated with testosterone nor the oestrogen plasmatic concentration. The results provide parameters that should be considered during the evaluation and selection of Chilean purebred stallions to avoid the extrapolation of data from other breeds.

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Section: Discussionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Andrological characterisation of Chilean purebred stallions

Castro

Morales

Miranda

2020

Austral j. vet. sci.

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Impact of inbreeding and genetic parameter estimates for seminal traits in Lusitano horses

Gonçalves,

Telo da Gama,

Antunes

et al. 2023

Theriogenology

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Factors influencing reproductive efficiency and pregnancy in Pura Raza Española mares

Akourki¹,

Echegaray²,

Falceto³

et al. 2017

Vet. Med. - Czech

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The aim of this study was to analyse ovarian activity and pregnancy in 140 Pura Raza Espanola mares over a period of two consecutive years. The data were analysed using SPSS software to evaluate the effects of age, category of mares and season on pre-ovulatory follicle size, ovulation rate, interval from foaling to pregnancy, gestation length, incidence of twin pregnancies and pregnancy losses. The results showed that follicular diameter was significantly (P < 0.05) smaller in fillies (3-year-old) and maiden mares than in older and multiparous mares. Within the group of animals treated with gonadotropin hormone hCG, 87.23% ovulated 48 h following administration. Length of gestation varied from 305 to 356 days and all gestation pregnancies of less than 305 days resulted in a non-viable foal. In addition, foaling season affected (P < 0.05) the post-partum conception interval and the length of gestation, which were shorter and longer in the winter foaling, respectively. Regarding the other parameters, mares of this stud exhibited relatively very low rates of double ovulations, twin pregnancies and pregnancy losses. We conclude that age and category of mares and foaling season influence fertility and foaling rates by affecting pre-ovulatory follicle size, pregnancy loss and gestation length.

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Seminal Characteristics in Spanish Purebred Stallions: A Retrospective Study

Cited by 3 publications

References 14 publications

Andrological characterisation of Chilean purebred stallions

Andrological characterisation of Chilean purebred stallions

Impact of inbreeding and genetic parameter estimates for seminal traits in Lusitano horses

Factors influencing reproductive efficiency and pregnancy in Pura Raza Española mares

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