The Structure and Radiographic Anatomy of the Alimentary Tract of the Tammar Wallaby, Macropus Eugenii (Marsupialia) 1. The Stomach.

1980 ◽  
Vol 28 (3) ◽  
pp. 367 ◽  
Author(s):  
KC Richardson
Keyword(s):  
Gastric Emptying ◽  
Contrast Agent ◽  
Distal Part ◽  
Alimentary Tract ◽  
Tammar Wallaby ◽  
Barium Sulphate ◽  
Macropus Eugenii ◽  
Middle Compartment ◽  
The Right

A description is given of the gross and radiographic anatomy of the stomach of Macropus eugenii. The stomach is in the form of a sigmoid tube beginning at a blind sac on the left side and ending at the caudally directed pylorus on the right side. It is haustrated over the whole length of the proximal compartment and most of the middle compartment. The distal part of the middle compartment, and the distal compartment, are not haustrated. The time, but not the pattern, of distribution and mixing with digesta of orally administered barium sulphate is shown to be different in wallabies which had been recently fed and those which had not been fed for 24 h. The contrast agent was carried from the cardia towards the caudal gastric flexure along the ventricular groove. The barium sulphate first dispersed both cranially and caudally from the ends of the groove and was subsequently mixed with digesta. Gastric emptying was difficult to determine radiographically. No radiopaque material was seen in the duodenum, and digesta were therefore assumed to have passed rapidly through into the jejunum.

Ovarian function and its manipulation in the tammar wallaby, Macropus eugenii

1993 ◽  
Vol 5 (1) ◽  
pp. 27 ◽  
Author(s):  
JC Rodger ◽  
SJ Cousins ◽  
KE Mate ◽  
LA Hinds
Keyword(s):  
Ovarian Function ◽  
Tammar Wallaby ◽  
Ovarian Activity ◽  
Follicle Development ◽  
Lh Surge ◽  
Macropus Eugenii ◽  
Multiple Ovulation ◽  
Gonadotrophin Releasing Hormone ◽  
The Right ◽  
Pregnant Mare Serum Gonadotrophin

This study aimed to develop a superovulation protocol for the monovulatory tammar wallaby (Macropus eugenii), and examined the regulation of ovarian activity which leads to alternate ovulation in this marsupial. The most effective stimulatory treatment was 20 I.U. pregnant mare serum gonadotrophin (PMSG) given intramuscularly (i.m.) 20 days after the activation of an oestrous cycle by the removal of a sucking pouch young (RPY). Bromocriptine treatment was given at the time of RPY if the animal was in early seasonal quiescence. Mating had generally occurred when animals were examined 2 days after PMSG treatment on the morning of Day 22 RPY. Ovulation occurred only if the animal was treated on Day 22 or 23 (i.e. 2 or 3 days after PMSG) with gonadotrophin releasing hormone (GnRH) to induce a luteinizing hormone (LH) surge. Three 30-micrograms injections of GnRH (in 0.2 mL olive oil) were delivered as i.m. injections at 3-h intervals. Radioimmunoassay confirmed that the PMSG dose used did not elevate circulating steroid hormone concentrations beyond those found in normal cycles and that the GnRH protocol led to an LH surge of at least 6 h. Although multiple ovulation was achieved, the number of ovulations was low (2 or 3 per female). A major factor influencing the low ovulation rate was that generally only one ovary responded. Fertilized eggs and cleaving embryos were obtained. However, the fertility of induced ovulations has not yet been examined systematically. Laparoscopic examination through successive natural cycles confirmed that follicle growth and ovulation in the tammar wallaby alternates between the right and left ovary. Inhibition of follicle development in the corpus luteum (CL)-bearing ovary was also seen in females treated with the exogenous gonadotrophin (PMSG/GnRH) superovulation protocol. Follicle development was inhibited during the first half of the cycle in the non-CL-bearing ovary and during the entire cycle in the CL-bearing ovary. This inhibition seemed to occur at the follicular level because exogenous gonadotrophin was unable to initiate a response during periods of inhibition and the response to gonadotrophin differed in the two ovaries. The number of follicles growing in the non-CL-bearing ovary in response to an exogenous gonadotrophin stimulus was inversely related to the weight of the growing CL for the first 19 days after RPY.(ABSTRACT TRUNCATED AT 400 WORDS)

scholarly journals Digestive plasticity of the small intestine and the fermentative hindgut in a marsupial herbivore, the tammar wallaby (Macropus eugenii)

2006 ◽  
Vol 54 (4) ◽  
pp. 287 ◽  
Author(s):  
Adam J. Munn ◽  
Peter Banks ◽  
Ian D. Hume
Keyword(s):  
Small Intestine ◽  
Body Mass ◽  
Alimentary Tract ◽  
Nutritional Ecology ◽  
Tammar Wallaby ◽  
Proximal Colon ◽  
The Body ◽  
Macropus Eugenii ◽  
Diet Versus ◽  
Pelleted Diet

We investigated the effects of a ground, pelleted diet versus natural forage on the gross morphology of the gastrointestinal tract of a medium-sized (5–7 kg body mass) macropodid marsupial, the tammar wallaby (Macropus eugenii). The empty wet mass (g) of the small intestine of tammar wallabies maintained on a pelleted diet for 6 weeks was 22% greater than that of animals maintained on natural forage, once body mass was taken into account by ANCOVA. Similarly, the body-mass-adjusted length of the tammar wallaby caecum and proximal colon combined was 25% longer in animals maintained on the pelleted diet compared with those maintained on forage. Our data suggest that food particle size may be directly involved in controlling the size of the post-gastric alimentary tract in tammar wallabies, and thus in their diet choice and nutritional ecology. Notably, this is the first study that links phenotypic plasticity of the gut directly to diet in a marsupial and we conclude that the tammar wallaby is an excellent model for exploring the causes and consequences of digestive plasticity in macropodid marsupials.

scholarly journals Surgical treatment for common hepatic aneurysm. Original one-step technique

Open Medicine ◽  
2020 ◽  
Vol 15 (1) ◽  
pp. 898-904
Author(s):  
Bruno Amato ◽  
Renato Patrone ◽  
Gennaro Quarto ◽  
Rita Compagna ◽  
Roberto Cirocchi ◽  
...  
Keyword(s):  
Surgical Treatment ◽  
Hepatic Artery ◽  
Distal Part ◽  
Intraoperative Ultrasound ◽  
Section Area ◽  
One Step ◽  
A New Technique ◽  
Open Surgical Treatment ◽  
The Right ◽  
Vascular Stapler

AbstractIntroductionHepatic artery aneurysms are rare, and their treatment represents a challenge for the surgeons.Materials and methodsA new technique is presented for common hepatic artery (CHA) aneurysm: it requires minimal vascular surgical dissection and only one linear vascular stapler is applied at the bottom of aneurysm. Aneurysm exclusion is easily obtained, which allowed retrograde thrombosis. Liver blood supply is ensured to the right and left hepatic artery, through the gastroduodenal artery, and can be previously monitored, with temporary clamping of the section area, by visual control, enzyme evaluation and intraoperative ultrasound examination. We reported an open surgical treatment, with simultaneous removal of hepatic and adrenal metastases, secondary to colon cancer.ResultsThe duration of vascular surgery was 30 min and did not involve complications. Postoperative controls confirmed the efficacy of the procedure.DiscussionThis original technique can be added to the various open and endovascular techniques so far described for the treatment of a CHA aneurysm. It is advisable as open surgery, mostly in case of associated pathologies.ConclusionsThe authors believe that this “one shot” technique by vascular staple of the distal part of CHA is minimally invasive and effective to obtain the exclusion of the aneurysm.

scholarly journals Growth of the corpus luteum and its progesterone content during pregnancy in the tammar wallaby, Macropus eugenii

Reproduction ◽  
1979 ◽  
Vol 57 (1) ◽  
pp. 131-136 ◽  
Author(s):  
M. B. Renfree ◽  
S. W. Green ◽  
I. R. Young
Keyword(s):  
Corpus Luteum ◽  
Tammar Wallaby ◽  
Macropus Eugenii
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