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

Castellini, Cesare; Lattaioli, P.; Cardinali, R.; Bosco, Alessandro Dal

doi:10.4995/wrs.2006.551

Cited by 9 publications

(9 citation statements)

References 15 publications

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“…If the repeatability is computed as the sum of h 2 , p 2 and c 2 , the values obtained would be 0.27 for the volume, 0.26 for concentration and 0.17 for sperm production per ejaculate. These values are of a similar magnitude to the values of repeatability estimated by Castellini et al. (2006) which were estimated to be 0.17 and 0.22 for concentration and sperm production, respectively, but lower than the values given by Bencheikh (1995) and García‐Tomás et al.…”

Section: Discussionsupporting

confidence: 76%

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Genetic parameter estimates for semen production traits and growth rate of a paternal rabbit line

Lavara

Vicente

Baselga

2010

Journal of Animal Breeding and Genetics

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Variance components of sperm production traits (volume in ml, V; concentration in ×10⁶ sperm/ml, CN; sperm production in ×10⁶ sperm, PROD) were estimated in a paternal line of rabbit selected for 25 generations based on daily weight gain (DG, g/day) between 28 and 63 days of age. Features of the marginal posterior distributions for ratios of genetic variance, variance owing to non-additive plus environmental permanent male effects and variance owing to common litter of birth effects with respect to phenotypic variance are reported. The correlations between sperm production traits and the selection criteria were also estimated. Three sets of two-trait analyses were performed, involving 12908 records of DG, 2329 ejaculates corresponding to 412 bucks and 14700 animals in pedigree file. The heritabilities (h²) of the semen traits were 0.13 ± 0.05, 0.08 ± 0.04 and 0.07 ± 0.03 for V, CN and PROD, respectively. The permanent environmental effects were lower than the corresponding values of h² and varied between 0.06 and 0.11. A favourable and moderate genetic correlation was observed between V and DG (0.36 ± 0.34; p > 0: 0.83), together with a non-favourable and moderate correlation between permanent environmental effects owing to common litter of birth for both traits (-0.35 ± 0.35; p < 0: 0.85). On the other hand, the correlation between male permanent environmental effects for semen traits and DG was moderate and non-favourable (-0.51 ± 0.29 with p < 0: 0.95 for DG-CN, and -0.31 ± 0.37 with p < 0: 0.79 for DG-PROD).

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Section: Discussionsupporting

confidence: 76%

“…Only a few studies on the repeatability and crossbreeding parameters can be found in the literature (Bencheikh 1995; Brun et al. 2002; Castellini et al. 2006; García‐Tomás et al.…”

Section: Introductionmentioning

confidence: 99%

Genetic parameter estimates for semen production traits and growth rate of a paternal rabbit line

Lavara

Vicente

Baselga

2010

Journal of Animal Breeding and Genetics

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“…Moreover, daily collection of semen for over two months in young adult rabbits led to the lowest ejaculate volumes and concentration of spermatozoa, as well as to the highest ratios of droplets in the latter. Conversely, a once weekly collection rhythm led to the highest output of spermatozoa (Castellini et al, 2006). In contrast, the effects of age on semen characteristics and fertilising capacity of sperm have not, to the best of our knowledge, been formally investigated in rabbits.…”

Section: Discussionmentioning

confidence: 94%

Study of copulatory behaviour in old male rabbits

2021

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<p>Male rabbit sexual behaviour consists of a single mount followed immediately by ejaculation. In young bucks this pattern changes gradually as they reach sexual satiety in a day and sexual exhaustion after several daily tests. Little is known about the characteristics of sexual behaviour in old rabbits (aged 48-54 mo) within a day and across daily tests leading to sexual exhaustion. By using sexually receptive(young) females, changed within a session to maximise copulation, we found that: a) the inter-ejaculatory interval increased between the first and last days of testing; b) test duration was 3.1 h on day 1 and 0.5 h on day 15; c) the “miss rate” (i.e., mounts not accompanied by ejaculation) significantly increased from the first to the last day of testing, regardless of when this occurred in each individual buck; d) the total number of ejaculations displayed in a session significantly decreased between the first and the last day of testing in all males; e) scent-marking (“chinning”) frequency significantly decreased after copulation to satiety, relative to that quantified at baseline, and was restored the following day. Compared with young bucks our results indicate quantitative, rather than qualitative, differences in sexual behaviour associated with age in rabbits. Specifically, on day 1 old bucks spent a shorter time engaged in copulation and displayed a lower number of ejaculations before reaching satiety than young males. In contrast, the interval between ejaculatory events and the “miss rate” increased across test days in both old and young rabbits. These results merit investigating the neuroendocrine mechanisms underlying the display of such an active sexual behaviour by old rabbit bucks.</p>

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“…Several studies have shown that the concentration of the particles in semen may be higher than that of the spermatozoa and the ratio varies depending on the collection rhythm and the health status of the rabbit bucks. A biological variation has also been observed with regard to the number of these particles produced by individual rabbits (Zaniboni et al, 2004;Castellini et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Validation of a spectrophometric method used for the measurement of spermatozoa concentration in rabbit semen

Castellini¹,

Lattaioli²,

Cardinali³

et al. 2010

World rabbit sci.

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ABSTRACT:In rabbits, the number of inseminated spermatozoa plays an important role in the fertility rate obtained after artificial insemination. However, methods for the correct determination of spermatozoa number are scarce. The aim of this study was to develop and validate a spectrophotometric method for the measurement of spermatozoa concentration corrected by the seminal particle/spermatozoa ratio. For this purpose 360 ejaculates were collected from 36 rabbit bucks. The semen samples were divided into three groups based on their particle/spermatozoa ratio subjectively determined by microscopic viewing. The spermatozoa concentration of each semen sample was evaluated by spectrophotometer and these results were compared with those obtained by using a haemotocytometer. The results of the standard spectrophotometric method were correlated with the results of the haemotocytometer count of spermatozoa (r=0.76; P<0.01). When the optical density was corrected by considering the P/S ratio, the correlation values greatly improved (r=0.94; P<0.01). The simplicity, rapidity and low cost of this method make it suitable for the routine measurement of spermatozoa concentration of heterospermic pools in rabbit artificial insemination centres.

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

Cited by 9 publications

References 15 publications

Genetic parameter estimates for semen production traits and growth rate of a paternal rabbit line

Genetic parameter estimates for semen production traits and growth rate of a paternal rabbit line

Study of copulatory behaviour in old male rabbits

Validation of a spectrophometric method used for the measurement of spermatozoa concentration in rabbit semen

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