Talk:Cat Development: Difference between revisions

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==10 Most Recent==
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===Cat Embryology===
<pubmed limit=5>Cat Embryology</pubmed>
===Pig Development===
<pubmed limit=5>Cat Development</pubmed>
==2012==


==2011==
==2011==

Revision as of 06:54, 25 December 2012

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Cite this page: Hill, M.A. (2024, March 28) Embryology Cat Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Talk:Cat_Development

10 Most Recent

Note - This sub-heading shows an automated computer PubMed search using the listed sub-heading term. References appear in this list based upon the date of the actual page viewing. Therefore the list of references do not reflect any editorial selection of material based on content or relevance. In comparison, references listed on the content page and discussion page (under the publication year sub-headings) do include editorial selection based upon relevance and availability. (More? Pubmed Most Recent)

Cat Embryology

<pubmed limit=5>Cat Embryology</pubmed>

Pig Development

<pubmed limit=5>Cat Development</pubmed>

2012

2011

Follicular growth monitoring in the female cat during estrus

Theriogenology. 2011 Oct 15;76(7):1337-46. Epub 2011 Jul 28.

Malandain E, Rault D, Froment E, Baudon S, Desquilbet L, Begon D, Chastant-Maillard S. Source INRA, UMR 1198 Biologie du Développement et Reproduction, Jouy en Josas, France.

Abstract

Follicular growth in the feline ovary is usually detected indirectly, through behavior observation, vaginal smears, or more invasively, by estradiol assay in blood. This study was designed to describe follicular dynamics by transabdominal ultrasonography. Secondly, the stage of follicular growth was associated to behavioral and vaginal changes. Ovarian ultrasonography was performed during nine anovulatory and 12 ovulatory cycles. Forty-eight follicles were followed during anovulatory cycles: on the first day of estrus behavior, 4.8 ± 0.2 follicles (2 to 7 per female) of 2.3 ± 0.01 mm mean diameter were present. Follicular growth continued at a rate of 0.2 ± 0.04 mm per day. At least one follicle in the cohort reached a diameter greater than 3.0 mm. Maximal follicular growth (when one follicle of the cohort reached the maximal diameter observed for the whole estrus) was reached 3.8 ± 0.3 days after the onset of estrus with the largest follicle reaching a diameter of 3.5 ± 0.04 mm. Growth of the various follicles within a cohort was not exactly synchronous. When no ovulation took place, the follicular diameter decreased by 0.1 ± 0.01 mm per day until the end of estrus. The first day after the end of behavioral estrus, the diameter of the largest follicle in each cohort was 2.7 ± 0.05 mm. No correlation was found between follicular development and either vaginal smear characteristics, or time elapsed since the onset of estrus. When ovulations were mechanically induced after one follicle had reached 3.0 mm in diameter, artificial insemination produced normal pregnancy rate and litter size: four pregnant females out of nine, and 2 to 4 kittens per litter. Ultrasonography proved thus to allow the monitoring of follicular growth in the female cat, with low correlation with behavior and vaginal smear modifications. Further studies are needed to evaluate the interest of an ultrasonographic ovarian follow-up to determine the optimal moment for ovulation induction prior to artificial insemination.

Copyright © 2011 Elsevier Inc. All rights reserved.

PMID 21798582

2009

Developmental changes of Müllerian and Wolffian ducts in domestic cat fetuses

Inomata T, Ninomiya H, Sakita K, Kashiwazaki N, Ito J, Ariga M, Inoue S. Exp Anim. 2009 Jan;58(1):41-5. PMID: 19151510


Development of external genitalia in fetal and neonatal domestic cats

J Vet Med Sci. 2009 Feb;71(2):139-45.

Inomata T, Ariga M, Sakita K, Kashiwazaki N, Ito J, Yokoh K, Ichikawa M, Ninomiya H, Inoue S.

Department of Laboratory Animal, School of Veterinary Medicine, Azabu University, Sagamihara, Kanagawa, Japan. inomata@azabu-u.ac.jp Abstract Development of the external genitalia of fetal and neonatal cat were studied macroscopically, paying attention to the formation of the labia and the sexual differentiation. The female urogenital folds budded from each side of the genital tubercle and, gradually extended to the tip of the genital tubercle by the 6.8 cm stage in crown-rump length. Then, the well-developed urogenital folds ensheathed completely the genital tubercle to form the prepuce of clitoris and the labia, flanking the external opening of vagina as the folds of skin which were equivalent to the labia minora in humans. The genital swellings known to become the labia majora in humans were clearly recognized in the caudolateral region of the genital tubercle during the fetal stage. These swellings became flat and obscure after birth. Thus, in cats the genital swellings did not join to the formation of the labia in the same way as in humans. The sex difference in the external genitalia was first observed at the 3.2-3.3 cm stages. In the male, the anogenital raphe appeared and the caudal portion of the genital swellings moved and fused each other at the caudal region of the genital tubercle. In the female, both features were not easy to observe.

PMID: 19262023

2008

Sex determining of cat embryo and some feline species

Zygote. 2008 May;16(2):169-77.

Ciani F, Cocchia N, Rizzo M, Ponzio P, Tortora G, Avallone L, Lorizio R. Source Department of Biological Structures, Functions and Technologies, University of Naples Federico II, Via F. Delpino, 1 - 80137 Naples, Italy. ciani@unina.it

Abstract

Sex identification in mammalian preimplantation embryos is a technique that is used currently for development of the embryo transfer industry for zootechnical animals and is, therefore, a resource for biodiversity preservation. The aim of the present study was to establish a rapid and reliable method for the sexing of preimplantation embryos in domestic cats. Here we describe the use of nested PCR identify Y chromosome-linked markers when starting from small amounts of DNA and test the method for the purpose of sexing different species of wild felids. To evaluate the efficiency of the primers, PCR analysis were performed first in blood samples of sex-known domestic cats. Cat embryos were produced both in vitro and in vivo and the blastocysts were biopsied. A Magnetic Resin System was used to capture a consistent amount of DNA from embryo biopsy and wild felid hairs. The results from nested PCR applied on cat blood that corresponded to the phenotypical sex. Nested PCR was also applied to 37 embryo biopsies and the final result was: 21 males and 16 females. Furthermore, beta-actin was amplified in each sample, as a positive control for DNA presence. Subsequently, nested PCR was performed on blood and hair samples from some wild felines and again the genotyping results and phenotype sex corresponded. The data show that this method is a rapid and repeatable option for sex determination in domestic cat embryos and some wild felids and that a small amount of cells is sufficient to obtain a reliable result. This technique, therefore, affords investigators a new approach that they can insert in the safeguard programmes of felida biodiversity.

PMID 18405438

2003

Testis morphometry, seminiferous epithelium cycle length, and daily sperm production in domestic cats (Felis catus)

Biol Reprod. 2003 May;68(5):1554-61. Epub 2002 Nov 27.

França LR, Godinho CL. Source Laboratory of Cellular Biology, Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil 31270-901. lrfranca@icb.ufmg.br

Abstract

There is very little information regarding the testis structure and function in domestic cats, mainly data related to the cycle of seminiferous epithelium and sperm production. The testis weight in cats investigated in the present study was 1.2 g. Compared with most mammalian species investigated, the value of 0.08% found for testes mass related to the body mass (gonadosomatic index) in cats is very low. The tunica albuginea volume density (%) in these animals was relatively high and comprised about 19% of the testis. Seminiferous tubule and Leydig cell volume density (%) in cats were approximately 90% and 6%, respectively. The mean tubular diameter was 220 microm, and 23 m of seminiferous tubule were found per testis and per gram of testis. The frequencies of the eight stages of the cycle, characterized according to the tubular morphology system, were as follows: stage 1, 24.9%; stage 2, 12.9%; stage 3, 7.7%; stage 4, 17.6%; stage 5, 7.2%; stage 6, 11.9%; stage 7, 6.8%; and stage 8, 11 %. The premeiotic and postmeiotic stage frequency was 46% and 37%, respectively. The duration of each cycle of seminiferous epithelium was 10.4 days and the total duration of spermatogenesis based on 4.5 cycles was 46.8 days. The number of round spermatids for each pachytene primary spermatocytes (meiotic index) was 2.8, meaning that significant cell loss (30%) occurred during the two meiotic divisions. The total number of germ cells and the number of round spermatids per each Sertoli cell nucleolus at stage 1 of the cycle were 9.8 and 5.1, respectively. The Leydig cell volume was approximately 2000 microm3 and the nucleus volume 260 microm3. Both Leydig and Sertoli cell numbers per gram of testis in cats were approximately 30 million. The daily sperm production per gram of testis in cats (efficiency of spermatogenesis) was approximately 16 million. To our knowledge, this is the first investigation to perform a more detailed and comprehensive study of the testis structure and function in domestic cats. Also, this is the first report in the literature showing Sertoli and Leydig cell number per gram of testis and the daily sperm production in any kind of feline species. In this regard, besides providing a background for comparative studies with other fields, the data obtained in the present work might be useful in future studies in which the domestic cat could be utilized as an appropriate receptor model for preservation of genetic stock from rare or endangered wild felines using the germ cell transplantation technique.

PMID 12606460

2002

Anat Histol Embryol. 2002 Feb;31(1):37-51.

Periods and stages of the prenatal development of the domestic cat

Knospe C. Source Institut für Tieranatomie der Ludwig-Maximilians-Universität München Veterinärstrasse. 13, D-80539 München, Germany. c.knospe@anat.vetmed.uni-muenchen.de

Abstract

Twenty-two stages of the prenatal development of the domestic cat are described for intraspecies comparison in embryological studies. These are assigned to the 15 embryonal periods based on the Nomina Embryologica Veterinaria to make the interspecies comparison possible.

PMID 11841356

Ultrasound aspects of fetal and extrafetal structures in pregnant cats

J Feline Med Surg. 2002 Jun;4(2):95-106.

Zambelli D, Caneppele B, Bassi S, Paladini C. Source Veterinary Clinical Department, Obstetrical and Gynaecological Section, University of Study of Bologna, Ozzano Emilia, Italy.

Abstract

Prenatal feline fetal growth and utero-placental development were ultrasonographically evaluated using an ultrasound scanner with a 10 MHz sector probe. Uterus, placenta, embryo, fetus and fetal membranes in 16 pregnant cats were monitored during the course of pregnancy; 13 subjects underwent an ovariectomy on specific days while three subjects went to term. Various anatomic structures, fixed in Carson-buffered formalin, were sectioned and then compared to ultrasound images. By ultrasound examination it is possible to evaluate every stage of the fetal development; the gestational chamber can be seen on the 10th and the embryo inside the chamber on the 14th day. By the 20th day it is possible to evaluate all the fetal membranes, and later it is possible to appreciate organs and structures such as the stomach, intestine, eyes (crystalline lens), kidneys and the cerebral choroid plexi, on the 30th, 40th, 50th, 39th and 40th day respectively. Based on our observations, it will be simpler to locate anomalies of development or pathologies during ultrasound examination of pregnant queens.

Copyright 2002 ESFM and AAFP. Published by Elsevier Science Ltd. All rights reserved.

PMID 12027508