Effects of artificial photoperiods on sexual behaviour and sperm output in the rabbit

Theau-Clément, Michèle; Michel, Nicole L.; Esparbié, Jean; Bolet, Gérard

doi:10.1017/s1357729800008249

Cited by 26 publications

(15 citation statements)

References 6 publications

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“…Concerning the influence of the rank of the ejaculate on semen characteristics, the higher mass motility found in the second ejaculate is in agreement with the results of Bencheikh [6] and Theau-Clément et al [27]. Several authors have found a higher concentration and production of spermatozoa in the second ejaculate [6,12,21,23,27].…”

Section: Discussionsupporting

confidence: 87%

“…Several authors have found a higher concentration and production of spermatozoa in the second ejaculate [6,12,21,23,27]. Our study did not allow verification of this since concentration was never recorded on both ejaculates from one buck and moreover it was only recorded on a selected sample of the ejaculates.…”

Section: Discussionmentioning

confidence: 60%

“…Due to the correlation between mass motility and concentration, concentration estimates were biased upwards. (27) 225 ab (27) 231 ab (26) 216 bc (27) +, *, **, *** significant at the level of 10%, 5%, 1%, 1‰.…”

Section: Discussionmentioning

confidence: 99%

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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: 87%

Section: Discussionmentioning

confidence: 60%

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Evidence for heterosis and maternal effects on rabbit semen characteristics

2002

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“…Thirty adult (7 months of age) New Zealand White rabbit bucks were divided into three homogeneous groups and submitted to 3 rhythms of semen collection: every day (D), every week (W) and every 2 weeks (2W). Rabbits were kept under a continuous 16 h light/8 h dark photoperiod (Theau-Clément et al, 1995) with an intensity of 40 lux (Besenfelder et al, 2005). The ambient temperature ranged from 18 to 27°C.…”

Section: Animals and Housingmentioning

confidence: 99%

Effect of collection rhythm on spermatozoa and droplet concentration of rabbit semen

Castellini¹,

Lattaioli²,

Cardinali³

et al. 2010

World rabbit sci.

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ABSTRACT:The aim of the paper was to analyse the effect of collection rhythms on spermatozoa and droplet concentration of rabbit semen. Thirty adult New Zealand White rabbit bucks were submitted to 3 collection rhythms: every day (D), every week (W), every 2 weeks (2W). The trial lasted 71 days and a total of 790 ejaculates were collected. Volume, concentration of spermatozoa, droplets and their dimensions were evaluated. Ejaculate volume and concentration of spermatozoa were the lowest (0.37± 0.08 mL and 48.9± 43.8x10 6 mL -1 , respectively) when the samples were collected daily, whereas the ratio droplets/spermatozoa was the highest (6.4 ± 3.3). The output of spermatozoa per week was the highest with W rhythm (173.4 ± 105.3x10 6 ), followed by D (134.2± 75.1x10 6 ) and by 2W (79.5 ± 49.8x10 6 ) collection whereas the weekly output of droplets was the highest for D (810.2 ± 615.7x10 6 ). In the following order of collection the spermatozoa concentration was similar in W and 2W while D showed a sharp decline of values after few collections. Semen droplets with respect to spermatozoa showed a more stable trend showing that droplets are able to respond better to high soliciting. Bucks submitted to an intensive rhythm were able to increase about 9-fold (respecting to W) the secretion of droplets by prostate glands. As a result, the ratio droplet/spermatozoa showed the highest values in daily collected semen (6.4 ± 3.3). The repeatability of seminal traits showed that volume and spermatozoa concentration had the highest value followed by droplets, and ratio droplets/spermatozoa. In conclusion, it is possible to affirm that the collection rhythm, besides influencing the concentration of spermatozoa, also affects the rate of droplet production. A collection rhythm every 2 weeks was detrimental to both the spermatozoa and droplet output.

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“…However, these animals selected for high growth rate usually present a relatively low sperm count (200-600 × 10 6 ), the number of inseminations per week being reduced to 10 or 20 (the main authors advise around 16-30 × 10 6 spermatozoa per insemination). Several studies have thus been carried out to increase the number of doses and quality of the sperm produced per male, reducing the number of sperm in insemination doses [1] or improving male management [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Rearing management of rabbit males selected by high growth rate: the effect of diet and season on semen characteristics

et al. 2004

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-A total of sixty-six young males were used to evaluate the effect of low (L), medium (M) and high (H) concentrations of dietary digestible energy received during the rearing seasons (autumn and spring) on the performance and main semen characteristics of males for artificial insemination selected by a high growth rate. Males reared during the spring season presented a significantly higher weight at weaning than those reared during the autumn season (P < 0.001), and these differences were maintained until the end of the trial. The requirements of the males were easily covered as a general rule. In the autumn group, the males were unable to intake the digestible protein recommended only during their 3rd month of life, especially with low concentrate diets (P < 0.05). H males showed higher semen concentration and production during the autumn season, while L males showed a higher semen concentration and production than M males during the spring season, the H group showed intermediate values (P < 0.001). Males reared during the spring season showed significantly higher values of sperm concentration (P < 0.01) and production (P < 0.01). H males presented a lower percentage of spermatozoa with cytoplasmic droplets than the L group (P < 0.05) and the lowest values for sperm abnormalities during the autumn season, while the L group presented higher values for percentage abnormalities, especially during the last month controlled (P < 0.05). As a general rule, the main motility parameters controlled were not affected by the rearing diet received nor the season. These results seem to indicate that the management of rabbit males during the growing and rearing periods seem to significantly affect their subsequent performance and semen production.rabbit males / rearing / semen characteristics / dietary energy / season

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Effects of artificial photoperiods on sexual behaviour and sperm output in the rabbit

Cited by 26 publications

References 6 publications

Evidence for heterosis and maternal effects on rabbit semen characteristics

Evidence for heterosis and maternal effects on rabbit semen characteristics

Effect of collection rhythm on spermatozoa and droplet concentration of rabbit semen

Rearing management of rabbit males selected by high growth rate: the effect of diet and season on semen characteristics

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