Metabolism and kidney function in the pouch young of the macropod marsupial <i>Setonix brachyurus</i>

Bentley, P. J.; Shield, John

doi:10.1113/jphysiol.1962.sp007007

Cited by 24 publications

(12 citation statements)

References 14 publications

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“…1987) compared with 37 mM in M. eugenii (Green et af. 1980) and 40 mM in S. brachyurus (Bentley and Shield 1962). The electrolyte concentration in mid-lactation I. macrourus milk is 95 mM, which is similar to that of D. viverrinus.…”

Section: Discussionmentioning

confidence: 60%

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Milk Composition in the Northern Brown Bandicoot, Isoodon macrourus (Peramelidae, Marsupialia)

Merchant

Libke²

1988

Aust. Jnl. Of Bio. Sci.

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Milk samples were obtained at regular intervals throughout lactation from northern brown bandicoots, Isoodon macrourus, in captivity. Total concentration of milk solids was initially 7% (w/w) and increased linearly to 45% (w/w) by 55 days. Carbohydrate, lipid and protein concentrations increased from about 2% (w/w) to about 7-8% (w/w) at 30 days. Thereafter they diverged, with lipid increasing to between 25-30% (w/w) at 56 days, protein reaching maximal values of 10-15% (w/w) at just over 40 days and carbohydrate gradually declining to about 5% (w/w) at 56 days before a rapid fall to 1-2% (w/w) at the completion of lactation. The milk of the bandicoot exhibits a similar pattern of change during the course of lactation to that shown by other marsupials.

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Section: Discussionmentioning

confidence: 60%

“…1987), M. eugenii (Green et af. 1980) and S. brachyurus (Bentley and Shield 1962). Linzell and Peaker (1971) note that it appears necessary for milk to be isosmotic with plasma and that its osmolarity is regulated predominantly by its carbohydrate and salt content.…”

Section: Discussionmentioning

confidence: 99%

Milk Composition in the Northern Brown Bandicoot, Isoodon macrourus (Peramelidae, Marsupialia)

Merchant

Libke²

1988

Aust. Jnl. Of Bio. Sci.

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“…At ages when they could voluntarily leave the pouch, quokka joeys showed well developed thermoregulatory powers. Bentley & Shield (1962) found that quokka joeys aged between 50 and 120 days of age still retained features of kidney function commonly met in foetal and new-born eutherians.…”

Section: Introductionmentioning

confidence: 90%

Oxygen consumption during pouch development of the macropod marsupial Setonix brachyurus

Shield¹

1966

The Journal of Physiology

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SUMMARY1. Measurements Of 02 consumption at 9 or 10 temperatures in the 20-40' C ambient temperature range were made on joeys with ages selected to cover the 180-day period of pouch occupancy.2. The rate of 02 consumption of joeys younger than 100 days increased directly with ambient temperature.3. After 100 days of age the 02 consumption rate at low temperatures rose and at about 140 days of age a constant rate was maintained over the full ambient temperature range.4. Heat transfer from joey to mother commenced after 100 days of age. 5. At 150-180 days of age the rate of 02 consumption at 20°C was approximately 12 times greater than at ages less than 100 days. A thermal neutral zone was established in the range 32-36°C by joeys older than 150 days.6. At the usual pouch temperature of 36.50 C, 02 consumption per unit wet body weight rose from 12 ml./kg.min at birth to 17 ml./kg.min at the end of pouch life. On a unit dry body weight basis it fell from 120 to 56 ml./kg. min. This decline parallels the decrease in growth rate.

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“…Liggins, Kennedy & Holm, 1967). Marsupials are born after a relatively short gestation and are considerably smaller than eutherian neonates.It has been postulated that the middle of pouch life, when homoiothermy is achieved, is comparable to the time of birth in eutherians (Bentley & Shield, 1962). Homoiothermy in the tammar wallaby, Macropus eugenii, is established between 140 and 170 days of pouch life (Setchell, 1974).…”

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confidence: 99%

“…It has been postulated that the middle of pouch life, when homoiothermy is achieved, is comparable to the time of birth in eutherians (Bentley & Shield, 1962). Homoiothermy in the tammar wallaby, Macropus eugenii, is established between 140 and 170 days of pouch life (Setchell, 1974).…”

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Adrenocortical Hormones in the Neonate and Pouch Young of the Tammar Wallaby, Macropus Eugenii

Catling¹,

Vinson²

1976

Journal of Endocrinology

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The adrenal cortex of many eutherian mammals is functional at birth and in some species at least may be involved in parturition (e.g. Liggins, Kennedy & Holm, 1967). Marsupials are born after a relatively short gestation and are considerably smaller than eutherian neonates.It has been postulated that the middle of pouch life, when homoiothermy is achieved, is comparable to the time of birth in eutherians (Bentley & Shield, 1962). Homoiothermy in the tammar wallaby, Macropus eugenii, is established between 140 and 170 days of pouch life (Setchell, 1974). Experiments were designed to determine when the adrenal cortex begins to synthesize and secrete steroids.Male pouch young of the tammar wallaby were bled from the carotid artery, and steroids were extracted with methanol. Adrenals were weighed, chopped and incubated (Vinson, Phillips, Chester Jones & Tsang, 1971 ; Vinson, 1974).In one experiment,neonatal adrenal tissue(50mg/ml)was incubated with [4-l4C] progesterone (1 µ / ) alone or with [7 -3 H] pregnenolone (1 µ / 1). Products were isolated as previously described (Vinson et al. 1971). Cortisol was identified as the major corticosteroid by fractionation in systems 1 and 2, treatment with acetic anhydride/pyridine and rechromatography as the acetate (systems 4 and 5), mixing with 50 mg authentic material and recrystal¬ lization. Successive specific activities were 143, 135 and 136 c.p.m./mg, and successive 3H:14C ratios 1-21, 1-25 and 1-27. In incubations with [14C] progesterone, labelled testosterone was identified by chromatography in systems 1 and 2, acetylation and rechromatography (system 2), addition of authentic tritiated material; hydrolysis with NaOH; oxidization with f-butyl chromate and rechromatography (systems 2, 5, 6 and 7). In the final three chromatograms the 3H: 14C ratios were 3-25, 2-95 and 3 1. In samples from incubations with [14C] -progesterone and [3 H] pregnenolone treated similarly (but without addition of [3H] testo¬ sterone), final 3H: 14C ratios were 1-71, 1-47 and 1-54. Yields of cortisol and testosterone were similar from both precursors, about 0-5%. These findings agree with those obtained using adult tissue from other marsupial species (Vinson et al. 1971 ;Vinson & Renfree, 1975).An index of corticosteroid and androgen levels in plasma and in incubations of adrenal tissue was obtained by direct competitive protein-binding assays (Vinson, 1974). At birth the animals weighed 0-410 + 0-01 g ( = 7) and the adrenals

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Metabolism and kidney function in the pouch young of the macropod marsupial Setonix brachyurus

Cited by 24 publications

References 14 publications

Milk Composition in the Northern Brown Bandicoot, Isoodon macrourus (Peramelidae, Marsupialia)

Milk Composition in the Northern Brown Bandicoot, Isoodon macrourus (Peramelidae, Marsupialia)

Oxygen consumption during pouch development of the macropod marsupial Setonix brachyurus

Adrenocortical Hormones in the Neonate and Pouch Young of the Tammar Wallaby, Macropus Eugenii

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