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1.
Sensors (Basel) ; 15(7): 17258-73, 2015 Jul 16.
Article in English | MEDLINE | ID: mdl-26193274

ABSTRACT

Heat stress is considered a limiting factor for sheep production. We used information from physiological characteristics linked to heat tolerance to determine whether infrared thermography temperatures were able to separate groups of animals and determine the most important variables in this differentiation. Forty-eight four-month-old male lambs from eight genetic groups were used. Physiological (rectal temperature-RT, heart rate-HR, respiratory rate-RR) and blood traits, infrared thermography temperatures, heat tolerance indices, body measurements, weight and carcass traits were measured. Statistical analyses included variance, correlations, factor, discrimination and regression. Observing the correlations between physiological characteristics (RT, RR and HR) with temperatures measured by infrared thermography, regions for further studies should include the mean temperature of flank, nose and rump. Results show that there are strong relationships between thermograph measurements and RR, RT and HR in lambs, which are suggested to be directly correlated with heat tolerance capacity of the different genetic groups evaluated in this study. The assessment of body surface temperature measured by the thermograph could be used as a noninvasive tool to assess heat tolerance of the animals.


Subject(s)
Adaptation, Physiological , Hot Temperature , Infrared Rays , Sheep/genetics , Sheep/physiology , Thermography/methods , Animals , Body Temperature/physiology , Brazil , Cluster Analysis , Male , Principal Component Analysis , Regression Analysis , Respiratory Rate/physiology
2.
J Biomed Mater Res B Appl Biomater ; 91(1): 221-7, 2009 Oct.
Article in English | MEDLINE | ID: mdl-19399842

ABSTRACT

The correction of wall abdominal defects often requires the use of implants such as polypropylene meshes. In spite of presenting good tissue acceptance, these biomaterials can migrate to adjacent viscera, promote enterocutaneos fistulas, tissue adherence and visceral erosions. In this work, the barrier effect of chitosan films associated with polypropylene meshes on adhesion formation experimentally induced in Wistar rats was evaluated. The animals were divided into two groups with 10 animals each. Animals in the CPP group were implanted with chitosan films associated with polypropylene meshes, whereas the ones in the PP group received only polypropylene meshes. After 8 days, the animals were submitted to euthanasia using CO(2) and a descriptive study focusing adhesion formation, visceral involvement with sutures and mesh peritonization was performed. Also, subimplanted material was collected for histopathology analysis. The results showed that the CPP group presented weak adhesions to the omentum over the stitch knots in eight animals. In all animals, the meshes were peritonized, not allowing their visualization after removing the chitosan films. In the PP group, six animals presented intestinal adhesions to the meshes and, in one of them, hepatic adhesion to the mesh was observed, besides omentum adhesion on more than 50% of the mesh area. The protective effect of chitosan films when sutured over polypropylene meshes, as well as no exacerbation of inflammation associated to the peritoneal lesions was statistically demonstrated. Therefore, chitosan films can indeed minimize the formation of peritoneal adhesions induced by polypropylene meshes in rats.


Subject(s)
Biocompatible Materials , Chitosan , Implants, Experimental , Peritoneum , Polypropylenes , Surgical Mesh , Tissue Adhesions/prevention & control , Animals , Biocompatible Materials/chemistry , Biocompatible Materials/metabolism , Chitosan/chemistry , Chitosan/metabolism , Materials Testing , Omentum/pathology , Omentum/surgery , Peritoneum/pathology , Peritoneum/surgery , Polypropylenes/chemistry , Polypropylenes/metabolism , Rats , Rats, Wistar
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