Sperm Output and Fertility of Rabbits Ejaculated Either Once a Week or Once a Day for Forty-Three Weeks

Gregoire, A. T.; Bratton, R.W.; Foote, R.H.

doi:10.2527/jas1958.171243x

Cited by 23 publications

(19 citation statements)

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“…Our results agree with previous ones on the low frequency of non-response to buck solicitation in rabbits and also on the high frequency of ejaculates which are polluted by urine [5][6][7]18]. In this species, the causes of semen discarding have not been studied extensively; however, Bencheick [6,7] already found, for the B bucks, a high percentage of ejaculates contaminated by urine (13.4%).…”

Section: Discussionsupporting

confidence: 82%

Evidence for heterosis and maternal effects on rabbit semen characteristics

2002

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-The analysis concerned 546 ejaculates from 65 bucks from two strains ('1601', a duplicate of the 'Verde' strain from INIA-Valencia, Spain-and '2066' from INRA, France) and their two reciprocal crosses, recorded during a 210 day period spanning from August 1996 to February 1997. Two ejaculates were collected from each buck every three weeks and semen traits were recorded every six weeks when the semen was used for insemination. All semen traits were recorded for both ejaculates except concentration, which was recorded only for the ejaculate selected for insemination (the better of the two ejaculates for mass motility). On average, mass motility (scale of Petitjean, 1965 [24]) was 6.75 (standard deviation 1.01), pH 7.28 (0.33), volume 0.62 mL (0.19 mL), percent of motile spermatozoa (PMS) 70.1% (7.5%), concentration 492 × 10 6 spz·mL -1 (142 × 10 6 ), the total number of spermatozoa per ejaculate (TSE) 321 × 10 6 (110 × 10 6 ) and the number of motile sperms per ejaculate (MSE) 231 × 10 6 (83 × 10 6 ). Both strains had similar performances except for the volume of the ejaculate (1601: 0.67 ± 0.04 mL; 2066: 0.52 ± 0.04 mL) and PMS (1601: 69.8 ± 1.4%; 2066: 66.4 ± 1.4%). There was a significant heterosis effect for concentration (37.5% of the parental average), mass motility (6.8%) and PMS (4.1%). Heterosis for the synthetic criteria TSE and MSE amounted to 37.6% and 42.3%, respectively. Strain differences in maternal effects were evidenced: strain 1601 exhibited favourable maternal effects on volume, PMS and mass motility.rabbit / semen / heterosis / maternal effects Résumé -Hétérosis et effets maternels sur les caractéristiques de la semence de lapin. L'analyse concerne 546 éjaculats issus de 65 mâles de deux souches ('1601', issue par duplication de la souche 'Verde'de l'INIA-Valencia, Espagne-et '2066'de l'INRA, France) et de leurs deux croisements réci-proques, contrôlés pendant 210 jours entre août 1996 et février 1997. Les mâles sont prélevés toutes les 3 semaines (2 éjaculats), mais les caractéristiques de la semence sont mesurées toutes les 6 semaines, lors de l'insémination. Tous les caractères sont contrôlés sur les 2 éjaculats sauf la concentration, mesurée uniquement sur l'éjaculat sélectionné pour l'insémination (le meilleur des 2 sur la motilité (0)5 61 28 53 53; e-mail: brun@toulouse.inra.fr massale). En moyenne, la motilité massale (échelle de Petitjean, 1965 [24]) est de 6,75 (écart-type de 1,01), le pH de 7,28 (0,33), le volume de 0,62 mL (0,19 mL), le pourcentage de spermatozoïdes motiles (PMS) de 70,1 % (7,5 %), la concentration 492 × 10 6 spz·mL -1 (142 × 10 6 ), le nombre total de spermatozoïdes par éjaculat (TSE) de 321 × 10 6 (110 × 10 6 ) et le nombre de spermatozoïdes motiles par éjaculat (MSE) de 231 × 10 6 (83 × 10 6 ). Les deux souches ont des performances identiques sauf pour le volume de l'éjaculat (1601 : 0,67 ± 0,04 mL ; 2066 : 0,52 ± 0,04 mL) et PMS (1601 : 69,8 ± 1,4 % ; 2066 : 66,4 ± 1,4 %). On observe un effet d'hétérosis significatif sur la concentration (37,5 % de...

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Section: Discussionsupporting

confidence: 82%

Evidence for heterosis and maternal effects on rabbit semen characteristics

2002

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“…In the experiments of D 'Amato et al (1979) the 20th ejaculate happened to be associated with the highest conception rate. In the rabbit there are reports of the effect of ejaculation frequency on sperm output (Edwards, 1940;Desjardins, Kirton & Hafs, 1968), on sperm output and fertility (Gregoire, Bratton & Foote, 1958) and on sperm output and semen characteristics (Amann, 1966;Kirton, Desjardins & Hafs, 1966). …”

Section: Discussionmentioning

confidence: 99%

Semen characteristics and fertility of rabbits subjected to exhaustive use

Adams

Singh

1981

Lab Anim

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SummaryUp to 26 ejaculations were obtained from male rabbits within a period of 8 hours. During the next 20 days, further ejaculates were collected to establish the pattern of restoration of normal values. Repeated ejaculation resulted in a marked and progressive decline in the 3 semen characters examined; sperm density returned only slowly (3 weeks) to the initial level whereas fructose and volume, in particular, responded much faster. No significant effect of ejaculate order on fertility, litter size or sex ratio was demonstrated.

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“…Bucks to be used as semen donors were trained to service an AV during a 2-to 3-week period (Gregoire et al, 1958). On the day of AI, semen samples from at least 3 bucks were collected into an AV equipped with a reservoir warmed to 42 to 45°C just prior to use (Adams, 1961;Hafez, 1970;Tesh and Tesh, 1971;Hagen, 1974).…”

Section: Procedures For Rabbitsmentioning

confidence: 99%