Growth and Development of Suncus murinus in Captivity on Guam

1968 ◽  
Vol 49 (1) ◽  
pp. 51-62 ◽  
Author(s):  
G. L. Dryden
Keyword(s):  
Growth And Development ◽  
Suncus Murinus ◽  
In Captivity

Growth and development of the barren-ground caribou. II. Postnatal growth rates

1968 ◽  
Vol 46 (5) ◽  
pp. 1023-1029 ◽  
Author(s):  
E. H. McEwan
Keyword(s):  
Growth And Development ◽  
Growth Characteristic ◽  
Growth Curves ◽  
Postnatal Growth ◽  
Maintenance Costs ◽  
Cyclical Pattern ◽  
Body Weights ◽  
In Captivity ◽  
Growth Constants ◽  
Slow Growing

The growth curves of minimum body weights of fast-growing caribou reared in captivity and slow-growing wild caribou are compared. Captive animals exhibit a cyclical pattern of growth characteristic of other cervid species. The differences in the declining growth constants of wild caribou compared to captive caribou are attributed to environmental factors and activity, resulting in higher maintenance costs.

Growth of the Eastern Quoll, Dasyurus viverrinus (Shaw), (Marsupialia) in Captivity

1984 ◽  
Vol 11 (1) ◽  
pp. 21 ◽  
Author(s):  
JC Merchant ◽  
K Newgrain ◽  
B Green
Keyword(s):  
Litter Size ◽  
Adult Female ◽  
Growth And Development ◽  
Mammary Glands ◽  
Adult Females ◽  
In Captivity ◽  
Molar Teeth ◽  
Males And Females ◽  
At Will

The growth and development, from 10 to 270 days old, of eastern quolls in a captive colony was recorded. Young were able to detach from the teat by 65 days of age and their eyes were open by 80 days. Statistically significant differences in some measurements from males and females were found as early as 85 days of age. The weaning period commenced at 102 days ofage, and coincided with eruption ofthe first molar teeth. Total independence, determined by the cessation of lactation in the mother, was as early as 142 days in litters of one or as late as 200 days in larger litters. There was a high correlation between litter size and age at independence. Lactation was maintained in all previously suckled mammary glands of adult females after the death of young aged 65 days or over if some siblings remained. This was due to the ability of young of this age to detach and reattach to the teats at will. The implication of this observation is that the commonly held view that the numbers of surviving young in marsupial litters corresponds to the number of lactating teats in the adult female may not always be correct.

scholarly journals Growth and development of red deer calves in captivity

1969 ◽  
Vol 14 ◽  
pp. 141-151 ◽  
Author(s):  
Ryszard Dzięciołowski
Keyword(s):  
Growth And Development ◽  
Red Deer ◽  
In Captivity

Chromosome pairing in inter-racial hybrids of the house musk shrew (Suncus murinus, Insectivora, Soricidae)

Genome ◽  
1998 ◽  
Vol 41 (1) ◽  
pp. 79-90 ◽  
Author(s):  
Pavel M Borodin ◽  
Margarita B Rogatcheva ◽  
Antonina I Zhelezova ◽  
Sen-ichi Oda
Keyword(s):  
Microscopic Analysis ◽  
Suncus Murinus ◽  
Electron Microscopic ◽  
Robertsonian Translocations ◽  
Chromosome Races ◽  
Y Chromosomes ◽  
Structural Heterozygosity ◽  
In Captivity ◽  
Fertile Hybrids ◽  
Racial Hybrids

Two chromosome races of the house shrew Suncus murinus that differ from each other for five Robertsonian translocations (8.17, 9.13, 10.12, 11.16, and 14.15), heterochromatic insertions in chromosomes 7 and X, and multiple rearrangements in the Y chromosome were crossed and then intercrossed in captivity to produce a hybrid stock. Electron-microscopic analysis of synaptonemal complexes in fertile and sterile hybrid males was carried out. Meiosis in sterile males did not progress beyond pachytene and was severely disrupted. Meiotic arrest was not determined by structural heterozygosity: heterozygotes for all variant chromosomes distinguishing two parental races were found in both sterile and fertile male hybrids. Fertile hybrids demonstrated an orderly pairing of all chromosomes. In heterozygotes for Robertsonian fusions, completely paired trivalents were formed between the Robertsonian metacentrics and homologous acrocentrics. In heterozygotes for chromosome 7, bivalents with a small buckle were observed in a small fraction of pachytene cells. No differences were found in the morphology and pairing pattern of sex bivalents, composed of the X and Y chromosomes derived from the same or different parental races. Univalents, multivalents, and associations between X and Y chromosomes and autosomal trivalents, as well as associations of autosomal trivalents with each other, were observed in a small fraction of the pachytene cells of fertile males. Our results indicate that the system controlling male sterility in interracial hybrids of S. murinus is of genic rather than of chromosomal type.

Hybrids in Marsupial Research

1989 ◽  
Vol 37 (3) ◽  
pp. 259 ◽  
Author(s):  
RL Close ◽  
PS Lowry
Keyword(s):  
Gene Mapping ◽  
Genetic Markers ◽  
Chromosome Numbers ◽  
Growth And Development ◽  
Parental Species ◽  
Interspecific Crosses ◽  
Personal Communications ◽  
In Captivity ◽  
Morphological Differences ◽  
Fertile Hybrids

Many species from the superfamily Macropodoidea hybridise in captivity despite chromosomal and/or morphological differences. Details of such hybrids were collected from the literature or by personal communications from researchers or breeders of macropods. A Table of known hybrids and notes on their fertilities is presented, which includes the chromosome numbers and differences in gross and C-banded karyotypes of each parental species. Also included in the table are the numbers of proteins known to differ in electrophoretic mobility between each pair of parental species, and the number of proteins which are polymorphic in either of the two parental species. This table, therefore, can be used in gene mapping studies for assessing which hybrids carry suitable chromosomal and genetic markers and might be fertile. Four different interspecific crosses have already been reported as fertile, and artificial methods of increasing fertility could increase the likelihood of producing fertile hybrids. Moreover, the variety of hybrids and their different degrees of fertility show that they are potentially valuable for studying the effects of genic and chromosomal heterozygosity on growth and development, meiotic processes and spermatogenesis.

Sexual Maturity in the Female Bandicoot Isoodon-Macrourus (Gould) in Captivity

1986 ◽  
Vol 34 (2) ◽  
pp. 199 ◽  
Author(s):  
RT Gemmell
Keyword(s):  
Adult Female ◽  
Growth And Development ◽  
Sexual Maturity ◽  
Environmental Cues ◽  
Development Rates ◽  
In Captivity ◽  
The Mean

In Queensland the bandicoot breeds throughout the year, but the breeding rate decreases from April to June. In this study, it was found that animals born from April to June gave birth to their first litter at an earlier age than those born in January-March, October-December or July-September: 204.0, 229.7, 244.0 and 286.8 days respectively. Similarly, the mean weights of the mothers of the four groups when giving birth to their first litter increased from 845.0 g to 873.0, 938.2 and 954.1 g respectively. The 11 bandicoots born in July-September formed two groups: five animals gave birth at 193.8 � 7.3 days (range 176-212 days) at a weight of 734.0 � 17.3 g (range 680-780 g) six animals gave birth at 364.3 � 7.7 days (range 352-399 days) at a weight of 1137.5 � 42.2 g (range 1020-1307 g). The latter group appeared to have delayed their sexual maturity during the decreased or non-breeding part of the year. Bandicoots which delay their sexual maturity are heavier when they produce their first litter than the faster developing animals. Therefore it is unlikely that decrease growth and development rates during April-June prevents the onset of sexual maturity. It is probable that the environmental cues which inhibit breeding in the adult female also affect the maturation of juvenile females.

An ultrastructural study of vegetative incompatibility in plants

1978 ◽  
Vol 36 (2) ◽  
pp. 436-437
Author(s):  
Randy Moore
Keyword(s):  
Ultrastructural Study ◽  
Cell Walls ◽  
Growth And Development ◽  
Solanum Pennellii ◽  
Initial Product ◽  
Basic Aspect ◽  
Tissue Interactions ◽  
Graft Interface ◽  
Antigen Antibody ◽  
Standard Fixation

Cell and tissue interactions are a basic aspect of eukaryotic growth and development. While cell-to-cell interactions involving recognition and incompatibility have been studied extensively in animals, there is no known antigen-antibody reaction in plants and the recognition mechanisms operating in plant grafts have been virtually neglected.An ultrastructural study of the Sedum telephoides/Solanum pennellii graft was undertaken to define possible mechanisms of plant graft incompatibility. Grafts were surgically dissected from greenhouse grown plants at various times over 1-4 weeks and prepared for EM employing variations in the standard fixation and embedding procedure. Stock and scion adhere within 6 days after grafting. Following progressive cell senescence in both Sedum and Solanum, the graft interface appears as a band of 8-11 crushed cells after 2 weeks (Fig. 1, I). Trapped between the buckled cell walls are densely staining cytoplasmic remnants and residual starch grains, an initial product of wound reactions in plants.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

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