Changes in milk carbohydrates during lactation in the common brushtail possum, Trichosurus vulpecula (Marsupialia:Phalangeridae)

1989 ◽  
Vol 1 (4) ◽  
pp. 309 ◽  
Author(s):  
EA Crisp ◽  
PE Cowan ◽  
M Messer
Keyword(s):  
Tammar Wallaby ◽  
Brushtail Possum ◽  
Trichosurus Vulpecula ◽  
Macropus Eugenii ◽  
Qualitative And Quantitative ◽  
Milk Samples ◽  
Nucleotide Pyrophosphatase ◽  
The Common ◽  
Quantitative Changes ◽  
Beta Galactosidase

Milk samples (186) were obtained at various stages of lactation from 27 common brushtail possums (Trichosurus vulpecula). Qualitative and quantitative changes in the milk carbohydrates during early and mid-lactation were similar to those previously seen in other marsupials; the principal carbohydrate was lactose early in lactation and higher oligosaccharides in mid-lactation, and the hexose concentration reached a peak during mid-lactation. However, the late-lactation milk was unusual in that the carbohydrate was mainly lactose and its concentration remained relatively high (3.5 to 5.5%). In contrast to earlier findings on the milk of the tammar wallaby (Macropus eugenii), little or no nucleotide pyrophosphatase, beta-galactosidase and alkaline phosphatase activities were detected late in lactation.

Limb development in pouch young of the brushtail possum (Trichosurus vulpecula) and tammar wallaby (Macropus eugenii)

2006 ◽  
Vol 0 (0) ◽  
pp. 060606025751023-???
Author(s):  
R. G. Lentle ◽  
M. C. Kruger ◽  
D. J. Mellor ◽  
M. Birtles ◽  
P. J. Moughan
Keyword(s):  
Limb Development ◽  
Tammar Wallaby ◽  
Brushtail Possum ◽  
Trichosurus Vulpecula ◽  
Macropus Eugenii

Composition of Milk of the Common Brushtail Possum, Trichosurus Vulpecula (Marsupialia: Phalangeridae): Concentrations of Elements

1996 ◽  
Vol 44 (5) ◽  
pp. 479 ◽  
Author(s):  
SE Jolly ◽  
GA Morriss ◽  
S Scobie ◽  
PE Cowan
Keyword(s):  
Growth And Development ◽  
Developmental Changes ◽  
Brushtail Possum ◽  
Trichosurus Vulpecula ◽  
Milk Samples ◽  
Eye Opening ◽  
The Common ◽  
Common Brushtail Possum ◽  
Zinc Levels ◽  
Almost All

The concentrations of 11 elements (calcium, copper, iron, magnesium, manganese, phosphorus, potassium, sodium, strontium, sulphur and zinc) were measured in milk samples collected from 193 lactating brushtail possums, Trichosurus vulpecula, at all stages of lactation. Most elements showed patterns of change during lactation similar to those of other marsupials. The most marked changes occurred at about 80-120 days, when the growth rate of the pouch young increased and developmental changes took place, such as eye opening and fur growth. Compared with eutherians, copper and iron concentrations were high in possum milk, as in other marsupials, but zinc levels were exceptionally high. Strontium and manganese levels, not measured before in marsupial milk, were considerably higher than levels reported in eutherian milk. In contrast to eutherian mammals, marsupial young must be supplied with large quantities of minerals in the milk as almost all growth and development occurs after birth, and possum young are entirely dependent on milk supplied by the mother for about the first 100 days.

scholarly journals 62. Sperm proacrosin/acrosin system in two marsupial species, the brushtail possum (Trichosurus vulpecula) and the tammar wallaby (Macropus eugenii)

2003 ◽  
Vol 15 (9) ◽  
pp. 62
Author(s):  
K. S. Sidhu ◽  
K. E. Mate ◽  
F. C. Molinia ◽  
J. C. Rodger
Keyword(s):  
Tammar Wallaby ◽  
Brushtail Possum ◽  
Trichosurus Vulpecula ◽  
Macropus Eugenii ◽  
Marsupial Species

scholarly journals Successful fertilization after superovulation and laparoscopic intrauterine insemination of the brushtail possum, Trichosurus vulpecula, and tammar wallaby, Macropus eugenii

Reproduction ◽  
1998 ◽  
Vol 113 (1) ◽  
pp. 9-17 ◽  
Author(s):  
F. C. Molinia ◽  
R. J. Gibson ◽  
A. M. Brown ◽  
A. M. Glazier ◽  
J. C. Rodger
Keyword(s):  
Intrauterine Insemination ◽  
Tammar Wallaby ◽  
Brushtail Possum ◽  
Trichosurus Vulpecula ◽  
Macropus Eugenii

scholarly journals Changes in a-Lactalbumin, Total Lactose, UDP-Galactose Hydrolase and other Factors in Tammar Wallaby (Macropus eugenii) Milk during Lactation

1987 ◽  
Vol 40 (1) ◽  
pp. 37 ◽  
Author(s):  
MichaeI Messer ◽  
Christine Elliott
Keyword(s):  
Post Partum ◽  
Rabbit Antiserum ◽  
Tammar Wallaby ◽  
Macropus Eugenii ◽  
Milk Samples ◽  
In Vitro Hydrolysis ◽  
Nucleotide Pyrophosphatase ◽  
Hydrolysis Of

a-Lactalbumin was isolated from milk of M. eugenii and its concentration in milk samples taken at various times during lactation (0-40 we.eks post partum) was determined by single radial immunodiffusion using rabbit antiserum to the purified protein. The a-lactalbumin concentration remained almost constant throughout lactation even though the concentration of total lactose (free �lactose plus lactose contained in oligosaccharides) feli to zero after 34 weeks post partum. This fall in lactose was accompanied by a rise in the free galactose and glucose concentrations and marked increases in UDPgalactose hydrolase, nucleotide pyrophosphatase, alkaline phosphatase and acid fj-galactosidase activities. It is suggested that the in vitro hydrolysis of UDP-galactose was due to nucleotide pyrophosphatase and that this enzyme may also playa role in vivo late in lactation by making UDP-galactose unavailable for the synthesis of lactose. Alternatively, lactose and lactose-containing oligosaccharides might be degraded by the acid fj-galactosidase during or after secretion.

scholarly journals Acrosome formation during sperm transit through the epididymis in two marsupials, the tammar wallaby (Macropus eugenii) and the brushtail possum (Trichosurus vulpecula)

1999 ◽  
Vol 194 (2) ◽  
pp. 223-232
Author(s):  
MINJIE LIN ◽  
JOHN C. RODGER
Keyword(s):  
Spatial Information ◽  
Dorsal Surface ◽  
Tammar Wallaby ◽  
Sperm Head ◽  
The Body ◽  
Brushtail Possum ◽  
Trichosurus Vulpecula ◽  
Macropus Eugenii ◽  
Acrosomal Membrane ◽  
Acrosome Formation

In certain Australian marsupials including the tammar wallaby (Macropus eugenii) and the brushtail possum (Trichosurus vulpecula), formation of the acrosome is not completed in the testis but during a complex differentiation process as spermatozoa pass through the epididymis. Using transmission and scanning electron microscopy this paper defined the process of acrosome formation in the epididymis, providing temporal and spatial information on the striking reorganisation of the acrosomal membranes and matrix and of the overlying sperm surface involved. On leaving the testis wallaby and possum spermatozoa had elongated ‘scoop’-shaped acrosomes projecting from the dorsal surface of the head. During passage down the epididymis, this structure condensed into the compact button-like organelle found on ejaculated spermatozoa. This condensation was achieved by a complex process of infolding and fusion of the lateral projections of the ‘scoop’. In the head of the epididymis the rims of the lateral scoop projections became shorter and thickened and folded inwards, to eventually meet midway along the longitudinal axis of the acrosome. As spermatozoa passed through the body of the epididymis the lateral projections fused together. Evidence of this fusion of the immature outer acrosomal membrane is the presence of vesicles within the acrosomal matrix which persist even in ejaculated spermatozoa. When spermatozoa have reached the tail of the epididymis the acrosome condenses into its mature form, as a small button-like structure contained within the depression on the anterior end of the nucleus. During the infolding process, the membranes associated with the immature acrosome are either engulfed into the acrosomal matrix (outer acrosomal membrane), or eliminated from the sperm head as tubular membrane elements (cytoplasmic membrane). Thus the surface and organelles of the testicular sperm head are transient structures in those marsupials with posttesticular acrosome formation and this must be taken into consideration in attempts to dissect the cell and molecular biology of fertilisation.

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