Reproduction in the Plain Rock-Wallaby, Petrogale penicillata inornata Gould, in Captivity, with Age Estimation of the Pouch Young

1979 ◽  
Vol 6 (1) ◽  
pp. 1 ◽  
Author(s):  
PM Johnson
Keyword(s):  
Age Estimation ◽  
Post Partum ◽  
Oestrous Cycle ◽  
Gestation Period ◽  
In Captivity ◽  
Hind Foot ◽  
Males And Females ◽  
Premature Removal

'Reproduction in the plain rock-wallaby was studied in captivity. The oestrous cycle ranged from 30.2 to 32.0 days and the gestation period from 30.0 to 32.0 days. A post-partum mating usually followed birth; the resultant quiescent embryo developed and was born 28-30 days after premature removal of pouch young. The pouch life of the young ranged from 189 to 227 days, males and females maturing sexually at approximately 590 and 540 days respectively. Tail and hind foot lengths were found to be useful indicators of age of young up to the end of pouch life.

Reproduction of the whiptail wallaby, Macropus parryi Bennett (Marsupialia : Macropodidae), in captivity with age estimation of the pouch-young

1998 ◽  
Vol 25 (6) ◽  
pp. 635 ◽  
Author(s):  
P. M. Johnson
Keyword(s):  
Age Estimation ◽  
Sexual Maturity ◽  
Post Partum ◽  
Age Determination ◽  
Oestrous Cycle ◽  
Gestation Period ◽  
Body Measurements ◽  
In Captivity ◽  
The Mean

Reproduction of the whiptail wallaby, Macropus parryi, was studied in captivity. The mean length of the oestrous cycle was 41.8 days while the mean length of the gestation period was 38.0 days. M. parryi bred throughout the year and post-partum oestrus was not recorded although mating did occur during the pouch life when the pouch-young was 118–168 days of age. The length of the pouch-life was 256–267 days and weaning occurred 104–215 days after emergence from the pouch. Sexual maturity for females occurred at 509–647 days of age. An age-determination table was produced and found useful for predicting age of pouch-young using body measurements.

Reproduction in the Bridled Nailtail Wallaby, Onychogalea fraenata Gould (Marsupialia : Macropodidae), in Captivity

1997 ◽  
Vol 24 (4) ◽  
pp. 411 ◽  
Author(s):  
P. M. Johnson
Keyword(s):  
Post Partum ◽  
Oestrous Cycle ◽  
Gestation Period ◽  
Young Males ◽  
In Captivity ◽  
Males And Females ◽  
The Mean

The reproduction of the endangered macropod Onychogalea fraenata was studied in captivity. O. fraenata breeds throughout the year. A post-partum oestrus was not recorded, although mating during the pouch life was observed when the pouch young were 80–92 days old. The mean length of the oestrous cycle was determined to be 36·2 days, while the mean length of a gestation period was 23·6 days. Pouch life ranged between 119 and 126 days, and the young males and females matured as early as 270 days and 136 days, respectively.

Reproduction in the red-legged pademelon, Thylogale stigmatica Gould (Marsupialia : Macropodidae), and age estimation and development of pouch young

1994 ◽  
Vol 21 (5) ◽  
pp. 553 ◽  
Author(s):  
PM Johnson ◽  
K Vernes
Keyword(s):  
Age Estimation ◽  
Post Partum ◽  
General Pattern ◽  
Age Determination ◽  
Gestation Period ◽  
Growth Equation ◽  
In Captivity ◽  
In The Wild ◽  
The Mean

The reproduction of Thylogale stigmatica in captivity was studied and a predictive growth equation for age determination of the pouch young was developed. The general pattern of reproduction involved an oestrous cycle of 29-32 days, a gestation period of 28-30 days and a mean pouch life of 184 days. A post-partum oestrus and mating generally followed birth. Births were observed in all months in captivity, and from October to June in the wild. Mean age of weaning of young was 66 days following permanent pouch emergence, and the mean ages at maturity for females and males was 341 and 466 days, respectively.

Reproduction in Sminthopsis-Longicaudata (Marsupialia, Dasyuridae) - Laboratory Observations

1986 ◽  
Vol 13 (1) ◽  
pp. 7 ◽  
Author(s):  
PA Woolley ◽  
A Valente
Keyword(s):  
Endangered Species ◽  
Breeding Season ◽  
Early Summer ◽  
Oestrous Cycle ◽  
Gestation Period ◽  
Late Winter ◽  
Breeding Condition ◽  
Males And Females ◽  
The Mean

Observations on the pattern of reproduction in Sminthopsis longicaudata, at present considered to be an endangered species, are presented. S. longicaudata is polyoestrous and in the laboratory females are in breeding condition from late winter (August) to early summer (December). They enter oestrus up to four times during the breeding season. Two litters were born 17 and 19 days post-mating, but the gestation period may be less than 15 days. The mean length of the oestrous cycle is 34.4 days. Both males and females may be able to breed in more than one season.

Breeding Biology of the Agile Wallaby, Macropus agilis (Gould) (Marsupialia : Macropodidae), in Captivity

1976 ◽  
Vol 3 (2) ◽  
pp. 93 ◽  
Author(s):  
JC Merchant
Keyword(s):  
Sexual Maturity ◽  
Post Partum ◽  
Cell Types ◽  
Morphological Characters ◽  
Oestrous Cycle ◽  
Vaginal Smear ◽  
Vaginal Smears ◽  
Main Cell ◽  
In Captivity ◽  
The Mean

Female agile wallabies in captivity reached sexual maturity at about 12 months old and males produced mature spermatozoa by 14 months. Breeding was continuous throughout the year and birth and oestrus were recorded in every month. The mean length of the oestrous cycle was 32.4 days, and the mean gestation period 29.4 days. Females exhibited post-partum oestrus, usually mating within 1 day of birth. Sixty-four young born in captivity comprised 24 males, 30 females and 10 of unknown sex. If a pouch young were removed or lost, the quiescent blastocyst resumed its development, to birth about 26.5 days later. Failure or absence of the blastocyst was followed by an oestrus at about the time of the corresponding post-partum oestrus. Both the oestrous cycle and the interval between removal of a pouch young and oestrus were significantly longer than when a pregnancy intervened. The oestrous cycle was characterized by changes in the proportions of the main cell types in the vaginal smear, and by changes in the appearance of the urogenital opening and the pouch and teats. The approach of oestrus could not be predicted from vaginal smears but the post-oestrous condition was always recognizable even without mating. Young animals first left the pouch for short periods between the ages of 176 and 211 days, and left permanently between 207 and 237 days. Animals of known age were measured and the development of various morphological characters noted at weekly intervals from about birth until 12 months old.

Reproduction of the spectacled hare-wallaby, Lagorchestes conspicillatus Gould (Marsupialia: Macropodidae), in captivity, with age estimation of the pouch young

1993 ◽  
Vol 20 (1) ◽  
pp. 97
Author(s):  
PM Johnson
Keyword(s):  
Age Estimation ◽  
Age Determination ◽  
Gestation Period ◽  
Northern Australia ◽  
Normal Pattern ◽  
Widespread Distribution ◽  
Young Females ◽  
In Captivity ◽  
One Year

Lagorchestes conspicillatus has a widespread distribution across northern Australia. Observations were made on reproduction in captive animals and a key produced for age determination of pouch young. Females commence breeding at about one year of age and males when slightly older. Reproduction in this species involved an oestrous cycle of 30 days, a gestation period of 29-31 days and a mean pouch life of 152 days. A postpartum oestrus and mating following a birth was the normal pattern of reproduction.

Reproduction in Antechinus maculatus Gould (Dasyuridae)

1975 ◽  
Vol 2 (1) ◽  
pp. 77 ◽  
Author(s):  
HJ Aslin
Keyword(s):  
Breeding Season ◽  
Reproductive Potential ◽  
Gestation Period ◽  
In Captivity ◽  
Males And Females

The smallest member of the genus Antechinus, A. maculatus has a breeding pattern unlike that of its congeners. Captive females are polyoestrous, and can rear several litters of young each year. Both males and females show an extended breeding season in captivity, and males do not become senile after 12 months of age. Seven litters of A. maculatus, each containing up to 11 young, have been bred; the gestation period is 19-20 days. In comparison with most other marsupials, A. maculatus has a high reproductive potential in captivity.

Reproduction in Captive Wallaroos - the Eastern Wallaroo, Macropus-Robustus-Robustus, the Euro, Macropus-Robustus-Erubescens and the Antilopine Wallaroo, Macropus-Antilopinus

1987 ◽  
Vol 14 (3) ◽  
pp. 225 ◽  
Author(s):  
WE Poole ◽  
JC Merchant
Keyword(s):  
Sexual Maturity ◽  
Post Partum ◽  
Reproductive Activity ◽  
Oestrous Cycle ◽  
Full Length ◽  
Reproductive Patterns ◽  
In Captivity

Wallaroos were bred in captivity during almost 20 years. Individual males attained sexual maturity at between 18 and 20 months old and females at between 14 and 24 months old; both sexes were capable of breeding throughout the year. Gestation was 30-38 d and extended almost the full length of the oestrous cycle, 31-46 d. Post-partum mating usually produced a blastocyst subject to lactational quiescence. Removal or loss of a pouch young usually resulted in birth 28-32 d later but up to 41 d later in the presence of an actively suckled young-at-foot. Pouch life ranged between 231 and 270 d, with vacation of the pouch usually followed by another birth 1-14 d later. Lactation exceeded 12-14 months but suckling had waned by 15-17 months. Reproductive patterns for M. r. robustus and M. r. erubescens were similar although significant differences between the subspecies were recorded in length of oestrous cycle, the interval from loss of pouch young to birth and post-partum oestrus, the length of pouch life and the time between vacation of the pouch and birth. In addition, the reproductive activity of hybrids produced by matings between the subspecies was observed, as was that of a limited number of M. antilopinus.

Breeding of a Captive Colony of Notomys fuscus Wood Jones (Rodentia : Muridae)

1980 ◽  
Vol 7 (3) ◽  
pp. 379 ◽  
Author(s):  
HJ Aslin ◽  
CHS Watts
Keyword(s):  
Breeding Season ◽  
Vaginal Bleeding ◽  
Post Partum ◽  
Reproductive Rate ◽  
Oestrous Cycle ◽  
Gestation Period ◽  
Pregnant Females ◽  
Delayed Implantation ◽  
Lactating Females

Reproductive data were obtained from a captive colony of N. fuscus over 10 years. Females had an oestrous cycle averaging 7.4 days, and a gestation period averaging 34.3 days. Only three possible instances of post-partum mating were recorded, but. some lactating females returned to oestrus 14-22 days after birth of their young. There was no evidence of delayed implantation due to lactation. Vaginal bleeding occurred in pregnant females 8-17 days before birth. Seventy-four litters were born, litter sizes ranging from one to five, average 2.7. No breeding season was evident. Both sexes were reproductively mature at 70 days old. Comparisons are made with other species of Notomys, and their generally low reproductive rate discussed.

scholarly journals [NO TITLE AVAILABLE]

2007 ◽  
Vol 67 (4) ◽  
pp. 707-713 ◽  
Author(s):  
V De Conto ◽  
R Cerqueira
Keyword(s):  
Sexual Dimorphism ◽  
Litter Size ◽  
Post Partum ◽  
Growth Curves ◽  
Gompertz Model ◽  
Significant Negative Correlation ◽  
Gestation Length ◽  
Significant Difference ◽  
In Captivity ◽  
Males And Females

The reproduction, development and growth of Akodon lindberghi were studied in captivity. The colony was derived from animals captured in Simão Pereira, Minas Gerais state, which represents a new area of geographical distribution known for this species. Twelve males and twelve females were crossed, producing 144 young in 53 litters. Post-partum oestrus was observed and gestation length was estimated in 23 days. Litter size ranged from 1 to 4 with a mean of 2.72 (SD = 0.97, n = 53) and modal size of 3. Sexual dimorphism was neither present in body mass at birth nor at weaning. There was a significant negative correlation between litter size and mass at birth or weaning. Permanent emergence of adult external appearance occurred at 15 days. Puberty for males and females was 43 and 42 days, respectively, and the first fecundation event for two females was recorded at 47 and 54 days of age. The weight growth was described by fitting a Gompertz model. No significant difference was found in any parameter of growth curves for males and females. Measurements (head-body, tail, hind foot and internal and external ear lengths) obtained for adult individuals also did not reveal the presence of sexual dimorphism.

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