The variety of sterility and gradual progression to fertility in hybrids of the horse and donkey

@article{Zong1989TheVO,
  title={The variety of sterility and gradual progression to fertility in hybrids of the horse and donkey},
  author={Emily Yu Zong and G Fan},
  journal={Heredity},
  year={1989},
  volume={62},
  pages={393-406}
}
Generally speaking, the majority of F1 hybrids between the horse and donkey are sterile and do conform to the hypothesis of gametogenic breakdown. The results of our own research, nevertheless, lead us to conclude that there is variability in degree of sterility and fertility for both F1 and B1 individuals, with a gradual advance from sterility to fertility being seen. This is the subject we will discuss from the points of view of oestrus, ovulation, mating, pregnancy, spermatogenesis… Expand
Testicular Characteristics and the Block to Spermatogenesis in Mature Hinny
TLDR
Results indicated that defects in seminiferous tubule development and structure occur in the testis of hinnies, which results in a block to spermatogenesis that prevents the formation of sperMatids and matured spermatozoa during meiosis in male hinnie. Expand
Cytological basis of sterility in male and female hybrids between sibling species of grey voles Microtus arvalis and M. levis
TLDR
It is suggested that substantial chromosomal and genetic divergence between the parental species affects preliminary alignment of homologues, homology search and elimination of ectopic interhomologue interactions that are required for correct homologous pairing. Expand
Refined genome-wide comparative map of the domestic horse, donkey and human based on cross-species chromosome painting: insight into the occasional fertility of mules
TLDR
Based on the hybridization results, genome-wide comparative chromosome maps involving the domestic horse, donkey and human are generated that define the overall distribution and boundaries of evolutionarily conserved chromosomal segments in the three genomes. Expand
Chromosome inheritance and reproductive barriers in backcrosses between two hybridizing Viviparus snail species
TLDR
All viable backcross progeny were homoploid as they inherited between seven and nine chromosomes from the hybrid father and the siring success of the karyotypically different hybrid sperm was skewed against one sperm karyotype depending on the non-hybrid mother in the cross. Expand
Laparoscopic Ovariectomy in Standing Mule Mares.
TLDR
A bilateral standing laparoscopic ovariectomy technique using the LigaSure technology was applied in 10 mare mules for treating unwanted behavioral patterns and owners declared to be satisfied with the resolution of the behavior. Expand
Horse domestication and conservation genetics of Przewalski's horse inferred from sex chromosomal and autosomal sequences.
TLDR
X chromosomal and autosomal data do not place Przewalski's horses in a separate clade within phylogenetic trees for horses, suggesting a close relationship between domestic and Przine's horses and the hypothesis that very few male horses along with numerous female horses founded the various domestic horse breeds is supported. Expand
Genetic evidence of hybridization between paletailed Spermophilus pallidicauda Satunin, 1903 and alashanic S. alaschanicus Büchner, 1888 ground squirrels in Mongolia
TLDR
Analysis of Spermophilus pallidicauda Satunin, 1903 from three localities in Mongolia using cytogenetic characteristics revealed the presence of a first-generation (F1) hybrid animal, and the mtDNA haplotypes of the three hybrids examined were highly similar to the Colobotis ground squirrels, albeit in phylogenetic reconstructions they were placed between Colobastis and Citellus. Expand
Current status of sperm functional genomics and its diagnostic potential of fertility in bovine (Bos taurus)
TLDR
Spermatozoal transcriptome profiling with validation studies are warranted in large numbers of animals to elucidate their significance for selecting fertile bulls for the breeding program and optimize cryopreservation and fertility yield. Expand
Chromosomes, conflict, and epigenetics: chromosomal speciation revisited.
TLDR
This review will examine both classical and current models of chromosomal speciation and describe the "evolving" theory of genetic conflict, epigenetics, and chromosomal Speciation. Expand
Comparative studies on testicular and epididymal morphology, and serum hormone concentrations in foxes and the hybrids during the breeding season.
TLDR
The results indicate that germ cell meioses in the hybrids were arrested at the prophase stage of meiosis, and that lesser concentrations of testosterone and greater concentrations of LH and prolactin can inhibit the completion of spermatogenesis. Expand
...
1
2
3
...

References

SHOWING 1-10 OF 28 REFERENCES
Development of the germ cells in the ovary of the mule and hinny.
TLDR
The development of oogonia in the ovaries of fetal and neonatal mules and hinnies was studied to determine whether they were capable of meiosis and oocyte formation, and the view that the degeneration of germinal cells is a direct result of parental chromosomal incompatibility is supported. Expand
Somatic chromosomes of the horse, the donkey and their hybrids, the mule and the hinny.
TLDR
There exist structural differences which are most noticeable in greater numbers of metacentric chromosomes in the donkey, and it is possible that these physical differences play a role in synaptic failure during meiosis. Expand
Does ‘affinity’ hold the key to fertility in the female mule?
Michie's hypothesis of ‘affinity’ is invoked to explain how fertility might theoretically be achieved in a female mule or hinny. Chromosomally balanced haploid gametes could be produced in theseExpand
A fertile mule and hinny in China.
TLDR
In China, where mules are bred extensively for work on the farms, a fertileFemale mule and a fertile female hinny have now been verified by chromosomal investigation, making it clear that mule-hinny fertility, at least for the female hybrid, is a real possibility. Expand
Fertile Mule in China and Her Unusual Foal
TLDR
Karyotype and biochemical investigations established the authenticity of the case of a fertile mule which gave birth to a filly foal sired by a donkey and the foal shows a unique hybrid karyotype not previously described. Expand
Cromosomes of the horse, the donkey, and the mule
TLDR
While the disparity between parental chromosomes satisfactorily accounts for sterility in male hybrids, it does not explain the occasional fertile female able to produce several offspring with no E. asinus traits. Expand
Male mule foal qualifies as the offspring of a female mule and jack donkey.
TLDR
The case of a cytogenetically verified female mule whose alleged male foal qualifies as offspring by a male donkey who is karyotypically a mule is reported here. Expand
Horse, ass, and mule chromosomes.
TLDR
Karyotypes of the horse with 64 chromosomes, the ass with 62 chromosomes, and the mule with 63 chromosomes are presented and chromosome complements are analyzed and compared. Expand
A mare mule--dam or foster mother?
TLDR
A female, horse-like foal was apparently born to a mare mule from mating to a Shetland stallion and was determined to be a horse by appearance, karyotype, blood type, and voice. Expand
Comparative Examination of Carboxylic Esterases in Sera of Horse, Donkey and their Hybrids
TLDR
Starch gel: horizontal migration, discontinued buffer system; tris-citrate pH 8.7 and borate 0.3 M, pH8.2; 10 samples analysed simultaneously; 0.1 ml. Expand
...
1
2
3
...