Oviducal sperm storage in turkeys: Spatial distribution of sperm within the uterovaginal junction sperm‐storage tubules

Bakst, M. R.; Vinyard, Bryan T.

doi:10.1002/jez.1156

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…In this context, alligator sperm are primarily stored within the junctions of the posterior uterus/ vagina and of the tube/isthmus, regions separated by as much as approximately 1-2 m from the infundibulum. This differs from avian species, where sperm reside in storage tubules located in the utero-vaginal junction, a short passage from the site of fertilization [50]. Thus, sperm movement and/or transport in crocodilian species would need to be rapid to facilitate their timely delivery to the predicted site of fertilization within the infundibulum.…”

Section: Discussionmentioning

confidence: 99%

The Australian saltwater crocodile (Crocodylus porosus) provides evidence that the capacitation of spermatozoa may extend beyond the mammalian lineage

et al. 2016

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Although mammalian spermatozoa only acquire functional maturity as they are conveyed through the male (epididymal maturation) and female (capacitation) reproductive tracts, the degree of post-testicular development necessary to achieve fertilization in other vertebrate species remains far less clear. Indeed, despite reports that the epididymis of birds and reptiles is capable of secreting proteins that bind and modify the sperm surface characteristics, it remains unclear whether capacitation is a pre-requisite for fertilization in these species. Using the ancient reptilian Australian saltwater crocodile as a model, this study was undertaken to explore whether reptile sperm do undergo capacitation-like changes following ejaculation. Our studies revealed that crocodile spermatozoa experienced a rapid and sustained, cyclic-AMP mediated increase in progressive motility following incubation under conditions optimized for the induction of capacitation in mammalian species such as the mouse and human. This response was coupled with elevated levels of phosphorylation associated with both protein kinase A and tyrosine kinase substrates, the latter of which were predominantly localized within the sperm flagellum. In findings that also accord with mammalian spermatozoa, we confirmed a homologue of outer dense fibre 2 as one of the principal substrates for tyrosine phosphorylation. Overall, our findings support the concept that crocodile spermatozoa do undergo a process that is homologous to capacitation in preparation for fertilization of an ovum.

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Section: Discussionmentioning

confidence: 99%

The Australian saltwater crocodile (Crocodylus porosus) provides evidence that the capacitation of spermatozoa may extend beyond the mammalian lineage

et al. 2016

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“…For example, female birds store sperm in sperm storage tubules at the utero‐vaginal junction of the oviduct. Recent experimental evidence indicates that in the domestic turkey, Meleagris gallopavo , only a maximum of 65% of the sperm storage tubules contained sperm, following artificial intravaginal inseminations of large (250 × 10 6 ) doses of sperm (Bakst & Vinyard, 2002). Similarly, some invertebrates have expandable sperm storage organs that (for many ejaculates) increase volumetrically as each ejaculate is added, so that the stored sperm increase linearly with number of matings (e.g.…”

Section: Sperm Competition Mechanisms and Sources Of Variation Inmentioning

confidence: 99%

Sperm competition and ejaculate economics

2010

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Sperm competition was identified in 1970 as a pervasive selective force in post-copulatory sexual selection that occurs when the ejaculates of different males compete to fertilise a given set of ova. Since then, sperm competition has been much studied both empirically and theoretically. Because sperm competition often favours large ejaculates, an important challenge has been to understand the evolution of strategies through which males invest in sperm production and economise sperm allocation to maximise reproductive success under competitive conditions. Sperm competition mechanisms vary greatly, depending on many factors including the level of sperm competition, space constraints in the sperm competition arena, male mating roles, and female influences on sperm utilisation. Consequently, theoretical models of ejaculate economics are complex and varied, often with apparently conflicting predictions. The goal of this review is to synthesise the theoretical basis of ejaculate economics under sperm competition, aiming to provide empiricists with categorised model assumptions and predictions. We show that apparent contradictions between older and newer models can often be reconciled and there is considerable consensus in the predictions generated by different models. We also discuss qualitative empirical support for some of these predictions, and detail quantitative matches between predictions and observations that exist in the yellow dung fly. We argue that ejaculate economic theory represents a powerful heuristic to explain the diversity in ejaculate traits at multiple levels: across species, across males and within individual males. Future progress requires greater understanding of sperm competition mechanisms, quantification of trade-offs between ejaculate allocation and numbers of matings gained, further knowledge of mechanisms of female sperm selection and their associated costs, further investigation of non-sperm ejaculate effects, and theoretical integration of pre- and post-copulatory episodes of sexual selection.

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“…Poultry possesses a unique ability to store sperm for a prolonged period in the oviduct ( Bakst et al, 1994 ; Bakst and Vinyard, 2002 , Bakst, 2011 ). The SST are located in the UVJ and infundibulum of the hen oviduct, where sperm can be stored and survived for few days to few weeks after single AI or natural mating ( Fujii, 1963 ).…”

Section: Discussionmentioning

confidence: 99%

“…After a single mating or artificial insemination ( AI ) in their breeding season, the female domestic birds appear to be capable of sustained fertility for days or weeks (depending on the species), which is a widespread phenomenon among numerous avian, reptilian, and mammalian species ( Bakst, et al., 1994 ). This period of sustained fertility is generally identified as the duration of fertility ( DF ) ( Bakst and Vinyard, 2002 ). The sperm storage function of the sperm storage tubules ( SST ) is directly correlated with the fertility of laying hens ( Han, et al., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

A genome-wide single nucleotide polymorphism scan reveals genetic markers associated with fertility rate in Chinese Jing Hong chicken

Azmal¹,

Nan

Bhuiyan³

et al. 2020

Poultry Science

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The function of the sperm storage tubules is directly correlated with the fertility of laying hens. However, little is known about the molecular mechanisms regulating the fertility traits in chicken. To identify genetic markers associated with reproductive traits, we calculated fertility rate at 61 to 69 wk (51 D) of Jing Hong chickens parent generation as the phenotype and the genotype were detected by the chicken 600K Affymetrix Axiom High Density single nucleotide polymorphisms ( SNP )-array. The genome-wide association study using 190 Jing Hong hens showed that the 20 SNP in chromosomes 3 and 13 were significantly associated with fertility rate. To verify these results, a total of 1900 Jing Hong laying hens from 2 populations (P1 and P2) were further genotyped by polymerase chain reaction–restriction fragments length polymorphisms method. The association analysis results revealed that 12 polymorphisms (AX-75769978, AX-76582632, AX-75730546, AX-75730496, AX-75730588, AX-76530282, AX-76530329, AX-76529310, AX-75769906, AX-75755394, AX-80813697 and AX-76582809) out of 20 showed highly significant effects ( P < 0.0001) on fertility rate in P1, P2 and P1+P2. Six haplotypes (TTAA, TTGG, TTAG, CTAA, CTGG, and CTAG) were inferred based on significant loci (AX-75730546 and AX-76530282) also showed significant association with fertility rate, where haplotype CTAG was shown to be markedly associated with the significantly highest ( P < 0.0001) fertility rate (in P1, 86.42 ± 0.59; P2, 85.98 ± 0.59 and P1+P2, 86.16 ± 0.42) followed by other haplotypes for the irrespective of population studied. Collectively, we report for the first time that 12 SNP in the chromosomes 3 and 13 were significantly associated with fertility rate during the later stage of egg production, which could be used as the potential genetic markers that would be able to facilitate in the selection and improvement of fertility rate through chicken breeding.

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Oviducal sperm storage in turkeys: Spatial distribution of sperm within the uterovaginal junction sperm‐storage tubules

Cited by 11 publications

References 11 publications

The Australian saltwater crocodile (Crocodylus porosus) provides evidence that the capacitation of spermatozoa may extend beyond the mammalian lineage

The Australian saltwater crocodile (Crocodylus porosus) provides evidence that the capacitation of spermatozoa may extend beyond the mammalian lineage

Sperm competition and ejaculate economics

A genome-wide single nucleotide polymorphism scan reveals genetic markers associated with fertility rate in Chinese Jing Hong chicken

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