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Barium sulphate was administered to two tortoises (Testudo graeca). Gastric emptying was not completed until 23 and 80 hours after barium administration and complete passage of barium through the gastrointestinal tract took 25 and 28 days. The consequences of these findings are discussed with reference to artificial feeding and medication regimes in chelonians.
Vet Rec 1978 Sep 02
PMID:Radiological studies of the alimentary tract in two Greek tortoises (Testudo graeca). 70 17

The effects of sedation with detomidine on oesophageal function were assessed by contrast radiography in 10 healthy adult thoroughbred horses. Barium swallows were monitored by means of image intensification, first without sedation and then after the intravenous administration of detomidine at doses of 10 and 20 micrograms/kg bodyweight. The transit time of contrast agent to the oesophageal hiatus was recorded and each swallow was scored for markers of oesophageal dysfunction. Analysis of the data indicated that there were highly significant dose dependent increases in the transit time, the retention of barium within the longitudinal mucosal folds, and retrograde peristalsis and pooling of contrast agent within the oesophagus at both the thoracic inlet and caudal to the base of the heart. The degree of gastrooesophageal reflux was not affected at either dosage. These changes in oesophageal function were similar to those recorded from cases of grass sickness and indicate that care should be taken in the interpretation of studies of swallowing in animals that have been given detomidine before a radiographic examination.
Vet Rec 1991 Jul 27
PMID:Effects of detomidine on equine oesophageal function as studied by contrast radiography. 192 11

Hypertrophic scars and keloids appear to be unique to humans since animals are not known to form these lesions. Therefore, in an effort to develop an experimental model for their study, implants of these human lesions were made in nude (athymic) mice (nu/nu) in suprascapular subcutaneous pockets. The implants were recovered from 2 to 246 days. By histological and fine structural parameters all implants remained viable and their morphological character was maintained. Selected mice were injected with barium to confirm by microangiography vascular flow between mouse and implant. Hoechst stain for DNA, used to distinguish mouse cells from human cells, confirmed vascular anastamosis between host and implant: barium-filled vessels in the interior of the implant demonstrated human endothelial cells. Peripheral vascularization of the implant with minimal ingrowth of mouse vessels occurs during the first 8 days. Anastamosis probably occurs sometime before 16 days postimplantation, or earlier, depending upon the availability of patent microvessels in the implanted tissue. The presence of the implant does not appear to prompt a continuing vascular growth into or throughout the implant. The time frame of 16 days postimplantation should be taken into account when developing schemata of experimental or therapeutic modalities.
Anat Rec 1989 Nov
PMID:Use of nude (athymic) mice for the study of hypertrophic scars and keloids: vascular continuity between mouse and implants. 281 36

In trials conducted in 1984 and 1985, the effects of selenium injections on the antibody responses of lambs marginally deficient in selenium to Salmonella dublin were assessed. Control lambs (mean glutathione peroxidase [GSHPx] less than 20 iu/ml) responded well to the vaccine. No difference was observed in the antibody titres of animals treated twice with 5 mg selenium as sodium selenate. During the following season animals given 50 mg selenium as barium selenate showed slightly higher titres than controls. The results show that marginally selenium deficient lambs are able to elicit strong antibody titres to a bacterial antigen and that supplementation with selenium produces, at best, a marginal enhancement of the responses observed.
Vet Rec 1986 Oct 25
PMID:Selenium supplementation in lambs: effects on antibody responses to a salmonella vaccine. 378 4

The anatomic structure of the mouse parotid gland was investigated by a sialographic method. The mouse parotid was infused with 0.4-0.6 micron grains of barium sulfate sol as an x-ray contrast medium and extirpated. The excised gland was flattened and imaged by using 10 or 25 k Vp x-rays. Twelve different strains of male mice 12 weeks old were investigated. It was found that the mouse parotid gland has the club-shaped major lobe and the accessory lobe and that the major lobe is further divided into three lobes: the superior lobe which extends underneath the ear, the middle lobe, and the inferior lobe which extends toward the submandibular gland. The accessory lobe began from the proximal part of Stensen's duct and extended to underneath the eye. The presence of the accessory lobe, the shape of the major lobe, and the branching pattern of the parotid duct tree were mouse strain dependent.
Anat Rec 1986 Feb
PMID:Sialographic investigations on the anatomy of mouse parotid glands. 395 71

Contrast radiography (barium sulphate suspension fed by stomach tube) was used to assess abomasal profile area (a reflection of tone in the abomasal wall) and the rate of abomasal emptying in healthy lambs aged four to 144 hours and in lambs affected by watery mouth. In healthy lambs abomasal profile area increased from 15.1 +/- 0.56 cm2/kg at four hours of age to 23.1 +/- 1.07 cm2/kg at 24 to 48 hours (P less than 0.001). There was no change up to 48 to 72 hours but after this age there was a substantial decrease to 12.8 +/- 0.76 cm2/kg at 120 to 144 hours (P less than 0.001). The rate of abomasal emptying decreased as abomasal profile area increased. Complete emptying of the abomasum was observed within three hours of feeding in the majority of lambs aged four hours (seven out of eight) and 120 to 144 hours (13 out of 16) but only in a minority of lambs aged 24 to 48 hours (one out of 11). In lambs affected by watery mouth (mean age [+/- se] 33 +/- 2.8 hours, n = 34) abomasal profile area was greater and the rate of abomasal emptying was slower than in healthy lambs aged 24 to 48 hours. These findings confirm the previous suspicion that watery mouth is associated with an impairment of gut motility. Abomasal emptying time was prolonged in lambs aged four hours when either ewe or cow colostrum was included with the contrast medium. A similar effect was observed in lambs aged 24 to 48 hours when cow colostrum was included. The castration of lambs aged four hours with rubber rings immediately before the administration of contrast medium had no effect on the rate of abomasal emptying.
Vet Rec 1985 Sep 28
PMID:Abomasal size and emptying time in healthy lambs and in lambs affected by watery mouth. 406 May 41

Twenty Angus cross heifers were fed a complete diet which contained 0.07 mg selenium/kg dry matter. Thirteen were injected subcutaneously with barium selenate at a dose rate of approximately 1 mg selenium/kg bodyweight and seven remained untreated. All the heifers were slaughtered during the following 121 days, the last of the treated group 119 days after injection. Glutathione peroxidase activity in blood increased within four weeks of administration and remained high thereafter. The selenium dependent glutathione peroxidase activity did not increase in liver kidney or muscle. The concentrations of selenium in the blood, liver and muscle were increased significantly from 30 days until 119 days. Between 76 and 99 per cent of the selenium injected remained at the site of injection.
Vet Rec 1985 Oct 19
PMID:Barium selenate injections in cattle: effects on selenium concentrations in plasma and liver and residues at site of injection. 407 29

Barium selenate was developed as a long-acting subcutaneous injection for selenium treatment. The results from trials using this product show that it is a safe preparation for treating and preventing selenium deficiency in sheep. It produces a satisfactory selenium status which will be maintained for at least six months and, when injected into pregnant ewes, results in the transfer of selenium from the ewe to its progeny.
Vet Rec 1984 Jun 09
PMID:Trials with a long acting parenteral selenium preparation in ruminants: sheep. 646 19

Parenteral treatments can provide a rapid successful method of supplementing ruminants with copper and selenium, and avoid the possible interactions between an oral supplement and other dietary constituents. The copper preparations studied contained copper complexed with calcium edetate (EDTA) or copper methionate , copper oxide or copper oxyquinoline sulphonate. The recommended doses of these commercial preparations contain different amounts of copper only part of which is transferred to the liver stores from which it can be released during the following months. The recommended dose of copper oxyquinoline sulphonate contains only 12 mg copper and the duration of its protective effect is short. Only a small proportion of the copper in copper methionate and copper oxide is transferred to the liver whereas nearly all the copper in a single dose of the EDTA complex (50 mg copper for sheep) is transferred to the liver stores. Although no longer recommended for use in sheep the copper EDTA complex can be administered to cattle to provide up to 1 mg copper/kg bodyweight. Selenium deficiency in both cattle and sheep can be corrected by the subcutaneous administration of up to 0.15 mg selenium/kg bodyweight as sodium selenate. However, if a dietary deficiency persists copper and selenium treatments are effective for only a few months. To avoid the need for repeated treatments, slowly dissolving or controlled release systems have been developed. Subcutaneous depots of barium selenate have been used (1 mg selenium/kg bodyweight) but large residues remained at the site of injection for up to three months. Initial trials with controlled release glasses containing copper have shown that they maybe useful for routine parenteral therapy.
Vet Rec 1984 May 05
PMID:Parenteral methods of supplementation with copper and selenium. 673 Feb 68

Recent availability of computerized image analysis has fostered hope that barium injection and landmarking of pulmonary arteries would be unnecessary for morphometric assessment when using this technique. We reasoned that if barium injection altered morphometric variables, it would do so in a linear fashion correlating with incremental increases in injection pressure of the barium. The two goals of the present study were to determine whether barium injection into arteries affected morphometric measurements and to determine whether incremental increases in injection pressure correlated with alterations in morphometric measurements in a linear fashion. Computerized image analysis was used to measure the internal elastic lamina (IEL) and external elastic lamina (EEL). Medial area (MA), luminal area (LA), percentage of medial thickness, IEL square root of MA, and idealized LA were calculated. Barium injection did not alter morphometric variables in a linear fashion correlating with incremental increases in injection pressure of the barium except the percentage of arteries that filled with barium. Maximum recruitment for pre-acinar arteries occurred at 40 mmHg pressure and 60 mmHg distending pressure for intra-acinar arteries. Incremental increases in injection pressure did not affect IEL, EEL, or calculated morphometric variables. However, IEL, medial thickness, and MA were all smaller in injected vessels than in uninjected vessels. IEL square root of MA and the ratio of measured vs. idealized LA were both increased in injected lungs. We suspect that vascular injection selects for evaluation, a population of smaller, thin-walled vessels, which in the uninjected lungs are collapsed and hence excluded from analysis.
Anat Rec 1998 09
PMID:Computerized morphometry of the pulmonary vasculature over a range of intravascular pressures. 973 46


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