scholarly journals Determination of sex of sacrum in adult Macaca mulatta1

2018 ◽  
Author(s):  
Yan-Mei Wang ◽  
Xiao-Fan Han ◽  
Xiao-Jin Zhao
Keyword(s):  
Sex Differences ◽  
Statistical Analysis ◽  
Sex Determination ◽  
Macaca Mulatta ◽  
Rhesus Macaques ◽  
Articular Surface ◽  
The Other ◽  
Transverse Diameter ◽  
Two Indices

[Abstract]BackgroundSacrum being a part of pelvis is an important bone for identification of sex in both living primates and fossil ones.AimAim of this work was to examine the sex differences of sacral parameters in rhesus macaques and to compare with those of the other primates.Materials and MethodsFifty-six adult scara of macaques (17 males and 39 females) have been investigated. Measurement of various parameters was done using sliding vernier calliper; and statistical analysis was done using SPSS 23.0 package.ResultsThe present study showed that the cranial breadth of the sacrum, the sacral length, transverse diameter and sagittal diameter of the cranial articular surface, and two indices of relative sacral breadth were highly significant for sex determination in Macaca mulatta. Comparison of the present data with other studies suggest that sex determination of sacrum can be very different in various types of primates.ConclusionThe results suggest that these measures may be functionally integrated in response to locomotion, obstetric adequacy and cephalopelvic proportions in primates. Sacral index is more reliable and should be applied for sex determination of sacrum in various anatomical and anthropological investigations.

Sex Differences in Hierarchical Stability in a Formation of a Mixed-Sex Group of Rhesus Macaques

2021 ◽  
Author(s):  
Lauren J Woodell ◽  
Brianne A Beisner ◽  
Amy C Nathman ◽  
Ashleigh Day ◽  
Ashley Cameron ◽  
...  
Keyword(s):  
Sex Differences ◽  
Macaca Mulatta ◽  
Dominance Hierarchy ◽  
Management Practice ◽  
Rhesus Macaques ◽  
Group Formation ◽  
Alpha Male ◽  
Dominance Relationships ◽  
Hierarchical Stability ◽  
Established Group

Forming groups of captive rhesus macaques (Macaca mulatta) is a common management practice. New formations of unfamiliar macaques can be costly, with high levels of trauma, particularly as intense aggression is used to establish a dominance hierarchy. Combining previous subgroups into one new group may be beneficial, as some individuals already have established dominance relationships. We tested this hypothesis by forming a new mixed-sex group of rhesus macaques that combined an established group of females with an established group of males. Prior to the mixed-sex group formation, both the female and male hierarchies had been stable for 3 y; after mixed-sex group formation these hierarchies were maintained by the females and were initially maintained by the males for 3 wks. However, the temporary hospitalization (due to a laceration caused by aggression) of the alpha male destabilized the male hierarchy. Age and weight then predicted male rank. Temporary hospitalizations resulted in rank changes for the males, evidenced by reversals in subordination signals. Thisstudy indicates that using established groups of familiar individuals may maintain female hierarchical stability in a mixed-sex group formation, but further research is needed to understand how to maintain and predict male hierarchical stability to reduce trauma. Improved knowledge of hierarchical stability would be invaluable to managers of large rhesus macaque groups and would help improve the welfare of captive rhesus macaques.

Sex determination by discriminant function analysis using the human tibia in a Central Indian population

2019 ◽  
Vol 59 (3) ◽  
pp. 171-179 ◽  
Author(s):  
Preetika M Chatterjee ◽  
Kewal Krishan ◽  
RK Singh ◽  
Tanuj Kanchan
Keyword(s):  
Sex Determination ◽  
Discriminant Function ◽  
Discriminant Function Analysis ◽  
Function Analysis ◽  
Articular Surface ◽  
Transverse Diameter ◽  
Long Bones ◽  
Human Beings ◽  
Biological Profile ◽  
Nutrient Foramen

In human beings, sexual dimorphism can be well distinguished in almost every bone of the skeleton. Establishing a reliable biological profile is the foremost step in identifying human skeletal remains. Sex determination along with the estimation of age, stature and ancestry comprise the important parameters in establishing a biological profile. The pelvis and skull are considered the most reliable bones in sexing human remains. In the absence of the pelvis and skull, forensic scientists must rely upon other parts of the skeleton for sex assessment. Determination of sex from long bones based on morphological traits can be a challenging task, as there are a few morphological differences between the sexes for long bones. However, metric variations can prove to be helpful, as they are reproducible and more reliable. Metric analysis also has the added benefit of being less biased than nonmetric analysis. This study aimed to establish sex determination standards from tibiae using discriminant function analysis. A total of 17 measurements were taken on 162 dry tibiae (116 males and 46 females) of known sex and in the age range 20–60 years. Discriminant function analysis was performed to derive models for sexing of the tibiae. The breadth of the medial articular surface was observed to be the best parameter for sex prediction from metric measurements of the tibia. In stepwise analysis, only seven parameters – namely, the breadth of the medial articular surface, the condylo-malleolar length, the circumference at the nutrient foramen, the breadth of the lateral articular surface, the maximum length, the transverse diameter in the middle of the bone and the transverse diameter at the level of the nutrient foramen – were entered into the discriminant functions. Overall, the accuracy of sexing was observed to be 93.8% and 95% with the direct method and the stepwise method, respectively. This study provides a database and standards for sex estimation from tibiae based on discriminant function models. This investigation further concludes that tibiae can be used for sex determination in forensic examinations.

CYTOTAXONOMY AND SEX DETERMINATION OF RUMEX PAUCIFOLIUS

1956 ◽  
Vol 34 (2) ◽  
pp. 261-268 ◽  
Author(s):  
Áskell Löve ◽  
Nina Sarkar
Keyword(s):  
Sex Determination ◽  
Y Chromosome ◽  
Sex Chromosomes ◽  
The Other ◽  
Large Chromosome ◽  
Dioecious Species ◽  
The Third ◽  
Male Sex ◽  
Morphological Differences

The western North American dioecious species Rumex paucifolius is shown to be a tetraploid with 2n = 28 chromosomes. It is the third tetraploid known within the subgenus Acetosa, and the first polyploid dioecious taxon of that group, the others having either 2n = 14 ♂, 15 ♀ (R. Acetosa and relatives), or 2n = 8 ♂, 9 ♀ (R. hastatulus). The sex chromosomes of R. paucifolius are of the XX:XY type, the male sex being heterogametic. The X is a large chromosome, while the Y is the smallest chromosome of the complement. The mechanism of sex determination of R. paucifolius follows the Melandrium–Acetosella scheme with strongly epistatic male determinants in the Y–chromosome. Other dioecious Acetosae follow the Drosophila–Acetosa scheme of sex determination with a balance between the number of X and autosome complements, the Y being sexually inert. It is concluded from the observed cytogenetical and morphological differences that R. paucifolius should constitute a section of its own, Paucifoliae, which should be placed as far as possible from the section Acetosa, though within the same subgenus. The other American dioecious endemic, R. hastatulus, is placed in a subsection of the section Acetosa.

scholarly journals ROLE OF SACRUM IN SEX DETERMINATION IN WEST BENGAL POPULATION

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Ujwala Bhanarkar ◽  
Baishakhi Koley
Keyword(s):  
Sexual Dimorphism ◽  
Sex Determination ◽  
West Bengal ◽  
Statistical Significance ◽  
Transverse Diameter ◽  
Medical Sciences ◽  
Curvature Index ◽  
Degree Of Certainty

Background: Sex classification of a bone is possible with a degree of certainty only if it can be compared to a series of bones of known sexual dimorphism. Different parameters and indices are available based on which the sex can be determined using sacrum. Thus, it always attracted the attention of the medico-legal experts for establishing the sex, because of its contribution to pelvic girdle and associated functional sex differences. Objective: Study the sexual dimorphism and regional differences of the varied features of the sacrum in West Bengal population and compare the significant anthropometric indices with similar observations across India. Material and method: The study comprised of 50 adult sacra (35 male and 15 female), obtained from the department of anatomy and department of forensic medicine of ICARE Institute of Medical Sciences and Research and Haldia Institute of Dental Sciences and Research, Haldia, West Bengal. Different parameters viz. mid ventral straight length, mid ventral curved length, ventral straight breadth, transverse diameter of base, transverse diameter of body of S1, antero-posterior diameter of body of S1, breadth of alae were measured and indices viz. sacral index, longitudinal curvature index and corporobasal index were calculated and statistically analyzed. Result: Sacral index was found to be the most useful criterion for identification of sex followed by breadth of alae, corporobasal index and the ventral straight breadth. Conclusion: In the present study, out of the eleven parameters of the sacrum, seven parameters yielded statistical significance between the two sexes. Therefore, it can be concluded that sex determination of the sacrum with 100% accuracy may possible only when maximum number of parameters are taken into consideration. Keywords: Sacrum, sexual dimorphism, sacral parameters, sacral index

scholarly journals Sex Differences in the Development of Social Relationships in Rhesus Macaques (Macaca mulatta)

2015 ◽  
Vol 36 (2) ◽  
pp. 353-376 ◽  
Author(s):  
Lars Kulik ◽  
Federica Amici ◽  
Doreen Langos ◽  
Anja Widdig
Keyword(s):  
Sex Differences ◽  
Social Relationships ◽  
Macaca Mulatta ◽  
Rhesus Macaques

Intercomparative Study on the Determination of Polynuclear Aromatic Hydrocarbons in Marine Shellfish Tissue

1988 ◽  
Vol 71 (2) ◽  
pp. 363-368 ◽  
Author(s):  
John F Uthe ◽  
Charles J Musial
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Liquid Chromatography ◽  
Statistical Analysis ◽  
Aromatic Hydrocarbons ◽  
Polynuclear Aromatic Hydrocarbons ◽  
The Other ◽  
Acetone Powder ◽  
Relative Standard ◽  
Polycyclic Aromatic

Abstract Twenty-five laboratories were sent 2 materials, one an acetone powder of lobster digestive gland, the other, the oil which had been extracted during preparation of the powder. Each laboratory was requested to measure the levels of a suite of polycyclic aromatic hydrocarbons in both materials. The response was poor with only 10 laboratories submitting results. Both intra- and interlaboratory precisions were poor; the interlaboratory error was so great as to preclude statistical analysis of the error. Relative standard deviations for oil results determined by liquid chromatography ranged from 39 to 96%.

scholarly journals Sex Determination According to the Lengths of Hand Bones in Rhesus Macaques (Macaca Mulatta )

2017 ◽  
Vol 300 (10) ◽  
pp. 1741-1746
Author(s):  
Huaxiang Tian ◽  
Xiaojin Zhao ◽  
Fengxia Hu ◽  
Haiyang Hu
Keyword(s):  
Sex Determination ◽  
Macaca Mulatta ◽  
Rhesus Macaques ◽  
Hand Bones

Sex Differences in the Development of Aggressive Behavior in Rhesus Macaques (Macaca mulatta)

2015 ◽  
Vol 36 (4) ◽  
pp. 764-789 ◽  
Author(s):  
Lars Kulik ◽  
Federica Amici ◽  
Doreen Langos ◽  
Anja Widdig
Keyword(s):  
Sex Differences ◽  
Aggressive Behavior ◽  
Macaca Mulatta ◽  
Rhesus Macaques

Comparison of protocols for cryopreservation of rhesus monkey spermatozoa by post-thaw motility recovery and hyperactivation

2006 ◽  
Vol 18 (7) ◽  
pp. 777 ◽  
Author(s):  
S. M. Nichols ◽  
B. D. Bavister
Keyword(s):  
Statistical Analysis ◽  
Cyclic Amp ◽  
Rhesus Macaques ◽  
The Other ◽  
In Vitro Fertilisation ◽  
Dibutyryl Cyclic Amp ◽  
Atmospheric Air ◽  
Cryopreservation Techniques ◽  
Over Time

Cryopreservation of spermatozoa is useful for gene banking and for in vitro fertilisation (IVF). This study compared several published cryopreservation techniques to find the most efficient for rhesus macaques. Effectiveness was assessed by sperm longevity (post-thaw motility % and duration) and ability to hyperactivate in response to chemical activators (caffeine, dibutyryl cyclic AMP). Each ejaculate from three males was treated with four published cryopreservation protocols (Seier et al. 1993; Sanchez-Partida et al. 2000; Si et al. 2000; Isachenko et al. 2005). Upon thawing, each sub-sample was incubated either at 37°C in 5% CO2 in air with or without activators or at ~22°C in atmospheric air without activators for 0–24 h. Samples cryopreserved using one method showed zero motility and were not included in the 2 × 2 G-test statistical analysis. The other methods all demonstrated good immediate post-thaw motility rates (68%, 73% and 62% respectively) and underwent capacitation after exposure to activators. Sperm motility in each treatment decreased over time at both temperatures but overall, incubation at 22°C preserved motility better in all three methods. In summary, cryopreservation of rhesus spermatozoa using the method published by Sanchez-Partida et al. or Seier et al. appeared best, potentially supporting gene banking as well as allowing for multiple IVF uses from the same sample.

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