Reproduction of the purple-necked rock-wallaby, Petrogale purpureicollis Le Souef (Marsupialia : Macropodidae) in captivity, with age estimation and development of the pouch young

2002 ◽  
Vol 29 (5) ◽  
pp. 463 ◽  
Author(s):  
Peter M. Johnson ◽  
Steven Delean
Keyword(s):  
Polynomial Growth ◽  
Age Determination ◽  
Mixed Effects Models ◽  
Embryonic Diapause ◽  
Linear Mixed Effects ◽  
In Captivity ◽  
Growth Equations ◽  
The Relationship ◽  
Age Prediction

Reproduction of the purple-necked rock-wallaby, Petrogale purpureicollis, was studied in captivity. The length of the oestrous cycle was 36–38 days followed by a gestation period of 33–35 days. Birth was usually followed by an oestrus and mating, and a subsequent lactation-controlled embryonic diapause. The interval between loss of pouch young and birth was 30–36 days. Pouch life was 178–197 days and weaning occurred 92–171 days after permanent emergence from the pouch. The youngest age at which sexual maturity was reached was 21.8 months for males and 18 months for females. Linear mixed-effects models were used to describe polynomial growth equations for age determination of pouch young using both head and pes length. The relationship between error in age prediction and each body measurement was also defined. Head measurements provided the most accurate estimates of the age of pouch young.

Development and age estimation of the pouch young of the black-striped wallaby Macropus dorsalis, with notes on reproduction.

2002 ◽  
Vol 24 (2) ◽  
pp. 193
Author(s):  
PM Johnson ◽  
S Delean
Keyword(s):  
Polynomial Growth ◽  
Age Determination ◽  
Mixed Effects Models ◽  
Embryonic Diapause ◽  
Linear Mixed Effects Models ◽  
Linear Mixed Effects ◽  
Growth Equations ◽  
The Relationship ◽  
Age Prediction

Macropus dorsalis was capable of breeding throughout the year. The period of gestation was 33 - 36 days. Birth was usually followed by an oestrus and mating, and a subsequent lactation-controlled embryonic diapause. The period between loss of pouch-young and birth was 29 - 30 days. Pouch life was 192 - 225 days and weaning occurred 81 - 159 days after permanent pouch emergence. Sexual maturity, defined as age at first fertility, occurred at 11.3 months in females and 15.7 months in males. Linear mixed-effects models were used to describe polynomial growth equations for age determination of pouch young using both head and pes length. The relationship between error in age prediction and each body measurement was also defined. Head measurements provided the most accurate estimates of the age of pouch young.

Corrigendum to: Reproduction in the northern bettong, Bettongia tropica Wakefield (Marsupialia : Potoroidae), in captivity, with age estimation and development of the pouch young

2001 ◽  
Vol 28 (6) ◽  
pp. 647 ◽  
Author(s):  
Peter M. Johnson ◽  
Steven Delean
Keyword(s):  
Polynomial Growth ◽  
Mating Behaviour ◽  
Age Determination ◽  
Embryonic Diapause ◽  
Linear Mixed Effects ◽  
In Captivity ◽  
Growth Equations ◽  
The Relationship ◽  
Age Prediction

Reproduction in the northern bettong, Bettongia tropica, was studied in captivity. B. tropica is capable of breeding throughout the year, and mating behaviour is similar to that reported for other Bettongia species. The length of the oestrous cycle was 21–23 days, and the period of gestation was 20–23 days. Birth was usually followed by an oestrus and mating, and a subsequent lactation-controlled embryonic diapause. The interval between loss of pouch young and birth was 19–20 days. Permanent emergence from the pouch occurred at 102–112 days, and young at foot were weaned at 166–185 days of age. Linear mixed-effects models were used to describe polynomial growth equations for age determination of pouch young using both head and pes length. The relationship between error in age prediction and each body measurement was also defined. Pes measurements provided the most accurate estimates of the age of pouch young.

Reproduction in the Proserpine rock-wallaby, Petrogale persephone Maynes (Marsupialia : Macropodidae), in captivity, with age estimation and development of pouch young

1999 ◽  
Vol 26 (5) ◽  
pp. 631 ◽  
Author(s):  
Peter M. Johnson ◽  
J. Steven C. Delean
Keyword(s):  
Polynomial Growth ◽  
Age Determination ◽  
Embryonic Diapause ◽  
Linear Mixed Effects ◽  
In Captivity ◽  
Growth Equations ◽  
The Mean ◽  
The Relationship ◽  
Age Prediction

Reproduction in the Proserpine rock-wallaby, Petrogale persephone, was studied in captivity. Sexual maturity, defined as age at first fertility, was attained at 20.5 months in females whereas males were not mature until 24.8 months. P. persephone is capable of breeding throughout the year. The length of the oestrous cycle was 33–38 days, while the period of gestation was 30–34 days. Birth was usually followed by an oestrus and mating, and a subsequent lactation-controlled embryonic diapause. The mean interval between loss of a pouch young and birth was 31.5 days. Pouch life was 203–215 days and young at foot were weaned 105–139 days after permanent emergence from the pouch. Linear mixed-effects models were used to describe polynomial growth equations for age determination of pouch young using both head and pes length. The relationship between error in age prediction and each body measurement was defined. Head measurements provided the most accurate estimates of the age of pouch young.

Reproduction in the northern bettong, Bettongia tropica Wakefield (Marsupialia: Potoroidae), in captivity, with age estimation and development of pouch young

2001 ◽  
Vol 28 (1) ◽  
pp. 79 ◽  
Author(s):  
Peter M. Johnson ◽  
Steven Delean
Keyword(s):  
Polynomial Growth ◽  
Mating Behaviour ◽  
Age Determination ◽  
Embryonic Diapause ◽  
Linear Mixed Effects ◽  
In Captivity ◽  
Growth Equations ◽  
The Relationship ◽  
Age Prediction

Reproduction in the northern bettong, Bettongia tropica, was studied in captivity. B. tropica is capable of breeding throughout the year, and mating behaviour is similar to that reported for other Bettongia species. The length of the oestrous cycle was 21–23 days, and the period of gestation was 20–23 days. Birth was usually followed by an oestrus and mating, and a subsequent lactation-controlled embryonic diapause. The interval between loss of pouch young and birth was 19–20 days. Permanent emergence from the pouch occurred at 102–112 days, and young at foot were weaned at 166–185 days of age. Linear mixed-effects models were used to describe polynomial growth equations for age determination of pouch young using both head and pes length. The relationship between error in age prediction and each body measurement was also defined. Pes measurements provided the most accurate estimates of the age of pouch young.

Reproduction of Lumholtz's tree-kangaroo, Dendrolagus lumholtzi (Marsupialia : Macropodidae) in captivity, with age estimation and development of the pouch young

2003 ◽  
Vol 30 (5) ◽  
pp. 505 ◽  
Author(s):  
Peter M. Johnson ◽  
Steven Delean
Keyword(s):  
Polynomial Growth ◽  
Post Partum ◽  
Age Determination ◽  
Linear Mixed Effects ◽  
In Captivity ◽  
Growth Equations ◽  
The Relationship ◽  
Dendrolagus Lumholtzi ◽  
Age Prediction

Reproduction in Lumholtz's tree kangaroo, Dendrolagus lumholtzi, was studied in captivity. The length of the oestrous cycle was 47–64 days and the gestation period was 42–48 days. Post partum oestrus and embryonic diapause were not observed in this study. The interval between loss of a pouch young and a return mating was 22 days. Pouch life was 246–275 days long and weaning occurred 87–240 days later. Sexual maturity was obtained in females as early as 2.04 years and in males at 4.6 years. Linear mixed-effects models are used to describe polynomial growth equations for age determination of pouch young using both head and pes length. The relationship between error in age prediction and each body measurement is also defined. Head and pes measurements provide equally accurate estimates of the age of pouch young.

scholarly journals Association of body condition with lameness in dairy cattle: a single-farm longitudinal study

2021 ◽  
pp. 1-4
Author(s):  
Michaela Kranepuhl ◽  
Detlef May ◽  
Edna Hillmann ◽  
Lorenz Gygax
Keyword(s):  
Body Condition ◽  
Body Condition Score ◽  
Mixed Effects ◽  
Mixed Effects Models ◽  
Linear Mixed Effects Models ◽  
Linear Mixed Effects ◽  
Confounding Variables ◽  
Condition Score ◽  
The Impact ◽  
The Relationship

Abstract This research communication describes the relationship between the occurrence of lameness and body condition score (BCS) in a sample of 288 cows from a single farm that were repeatedly scored in the course of 9 months while controlling for confounding variables. The relationship between BCS and lameness was evaluated using generalised linear mixed-effects models. It was found that the proportion of lame cows was higher with decreasing but also with increasing BCS, increased with lactation number and decreased with time since the last claw trimming. This is likely to reflect the importance of sufficient body condition in the prevention of lameness but also raises the question of the impact of overcondition on lameness and the influence of claw trimming events on the assessment of lameness. A stronger focus on BCS might allow improved management of lameness that is still one of the major problems in housed cows.

THE RELATIONSHIP OF PLACENTAL THICKNESS WITHGESTATIONALAGE IN THIRD TRIMESTER AND PROBABLE FETAL OUTCOME

2021 ◽  
pp. 64-66
Author(s):  
Sambhunath Bandyopadhyay ◽  
Ritayan Sasmal ◽  
Debarshi Jana
Keyword(s):  
Birth Weight ◽  
Gestational Age ◽  
Age Determination ◽  
Fetal Outcome ◽  
Inclusion Criteria ◽  
Third Trimester ◽  
Relationship Of ◽  
The Relationship ◽  
Placental Thickness

Accurate gestational age determination is very important for management of continuation and termination planning of the pregnancy. rd To establish placental thickness as a parameter for determination of gestational age and fetal growth pattern at 3 trimester. 100 primigravida women who are fullling the inclusion criteria and attend gynae &obs OPD or admitted in their third trimester at IPGME&R from January 2017 to june 2018. Placental thickness at 3rd trimester USG scan is moderately correlated with gestational age, if placental thickness expressed in millimeter then it correlated with gestational age at weeks. rd st Placental thickness with >3.2 cm (32 mm) at 3 trimester almost associated with good fetal outcome, with APGAR score >8 at 1 min and birth weight >2500 gm.

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 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.

Age Determination of the Spider Crab Maja squinado and the European Lobster Homarus gammarus by 228Th/228Ra Chronology: Possible Extension to Other Crustaceans

1989 ◽  
Vol 46 (4) ◽  
pp. 720-724 ◽  
Author(s):  
Didier Le Foll ◽  
Evelyne Brichet ◽  
Jean Louis Reyss ◽  
Claude Lalou ◽  
Daniel Latrouite
Keyword(s):  
Activity Ratio ◽  
Natural Radionuclides ◽  
Age Determination ◽  
Spider Crab ◽  
European Lobster ◽  
Homarus Gammarus ◽  
Decapod Crustacea ◽  
In Captivity

A method of age determination was developed on carapaces of the spider crab, Maja squinado Herbst and European lobster Homarus gammarus L., by measuring the natural radionuclides activity ratio, 228Th/228Ra in the exoskeleton. This method allows the determination of the time elapsed since the preceding molt of the animal. It was successfully tested on five spider crabs and four lobsters which had molted in captivity and therefore had a carapace of known age. It is probable that the method could, with some reservations, be extended to all marine Decapod Crustacea bearing a well calcified exoskeleton.

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