Oral and Poster Abstracts

5.00+0.67 and 4.94+0.15 mEq/l in the blood plasma of yaks in the
three trimesters of pregnancy, respectively.
1062 Relationship between Hepatotoxic Compounds and
Photosensitization in Cattle
J. Seixas 1 , P. Peixoto 2 , C. Pinto 3
1
Universidade Federal Rural do Rio de Janeiro, Curso de Pos
Graduacao em Ciencias Veterinarias, Seropédica, Rio de Janeiro,
Brazil
2
Universidade Federal Rural do Rio de Janeiro, Instituto de
Zootecnia, Seropédica, Rio de Janeiro, Brazil
3
Serviço de Desenvolvimento Agrário de Sao Miguel, Ponta Delgada,
Portugal
Most photosensitization in cattle is caused by phylloerythrin
retention consequential to liver damage caused by hepatotoxic
compounds. Injury to hepatic canalicular membranes and subsequent
cholestasis occurs in Lantana spp poisoning, although there is also
significant parenchimal lesions. Primary hepatocellular injury is
caused by the consumption of Myoporum laetum. Photosensitization
caused by sporidesmin from Pithomyces chartarum is characterized
mainly by marked fibrosis biliary obstruction may be caused by the
presence of birefringents crystals. The consumption of plants
containing saponins causes icterus which has, as one of the main
characteristics, crystal-associated cholangiopathy. Poisoning by
saponins is developed after consumption of Tribulus terrestris,
Panicum spp, Narthecium ossifragum and Brachiaria spp. This work
describes the main hepatotoxins causing cattle photosensitization
and relates them to their pathogenetic effects. The pentacyclic
triterpenoids (present in Lantana spp) cause intrahepatic cholestasis
with the inhibition of bile secretion. The metabolism of essential oils
of furanosesquiterpenes (M. laetum) cause hepatic necrosis. Saponin
poisoning normally occurs with hepatic biliary crystal obstruction.
Injury to the biliary ducts caused by the sporidesmin is characterized
by severe pericholangitis caused by the generation of oxygen free
radicals and resulting in fibrosis. There is no scientific consensus
about T. terrestris and N. ossifragum poisoning concerning hepatic
target lesions: hepatocellular or biliary system. Brachiaria spp
poisoning should be better included in the group of primary liver
parenchymal damaging plants, because of although it occur, in a
small percentage of cases, deposition of crystals birefringents in the
biliary ducts, those lesions are, in general, enough located. On the
other hand, ultramicroscopy reveals marked deposition of crystals
inside hepatocytes, with development of degenerative alterations. It
is also very characteristic the formation of numerous foam cells,
general under form of foci (crystals and remainders of necrotic
hepatocytes inside the macrophages) (Lemos et al., 1997; Driemeier
et al., 1998; Gomar et al., 2005; Seixas & Peixoto, 2007). Those
characteristics indicate that the phylloerythrin retention in case of
Brachiaria spp poisoning is doing in the hepatic parenchyma and not
in the biliary system.
Key words: photosensitization, hepatotoxic compounds, saponins,
sporidesmin, Brachiaria spp
1063 Urinary Bladder Rupture in Consequence of Urolithiasis in
Nelore Cattle
R. Godoy, L. Gouvea, C. Leite, C. Pereira, FH. Ximenes,
L. Gontijo, R. Ferreira II, JR. Borges
Universidade de Brasília, FAV, Brasília-DF Brazil, Brazil
Objective: The case report is of Nelore cattle, 28 months, male,
presenting obstructive urolithiasis and urinary bladder rupture,
examined at the School Hospital of Large Animals at the University of
Brasília.
Material and method the animal had anuria, tachycardia,
dehydration, abdominal pain and azotemia. It was on exhibition for
24 days, being fed with hay, silage and concentrate. Trans-rectal
palpation showed a filled bladder, soon after that the animal expelled
a calculi. The urine had reddish colour, density 1,010, pH 7.0,
protein (++), haemoglobin (++++) and macroscopically a lot of
smaller stones could be visualized. The treatment during
hospitalization was of continuous intravascular fluid, vitamin C
(10mg/Kg - TID - 3 days), enrofloxacin (5mg/Kg - SID - 5 days),
flunixim meglumine (1.1 mg / kg - SID - 2 days), oral-ruminal
hydration and restricted diet of grass. The improvement was evident
302 XXV. Jubilee World Buiatrics Congress 2008
by the obtention of normal colored urine in the end of the second day
of treatment. The animal was released with guidance of restriction of
continuous concentrate feed as treatment. Forty days after, it
returned to the Veterinary Hospital showing symptoms worsened to
his previous hospitalization, again with a history of beind fed with
concentrate. The animal was apathetic with dirty nostrils, reluctant
to move, tachycardiac, with severe dehydration, tachypnea,
abdominal pain and ruminal. Paracentesis revealed large quantities
of fluid with odor resembling urine. The presence of a greater
concentration of creatinine in the peritoneal fluid (42.5 mg / dL)
compared to its serum concentration (10.5 mg / dL) proved the fact
of it being urine. Exploratory laparotomy was performed and
confirmed the rupture of bladder.
Results: after analysis of laboratory tests, clinical evaluation and
laparotomy, euthanasia was performed. At necropsy, macroscopically
confirmed the bladder rupture and found to be calculi of 2.5 x1, 0cm the
cause of obstruction in urethra near the glans.
Conclusion: It was concluded that treatment done during the first
hospitalization was effective, however, animals with a predisposition
to the formation of calculi that continue to receive food rich in
concentrate and are subjected to constant stress, may have recurrent
obstructions. Comparison of the levels of creatinine, in the serum and
peritoneum, proved to be an important tool in the diagnosis of the
presence of urine in the abdominal cavity.
Key words: calculi, urethra obstruction, creatinine
1064 Carcass pH and Temperature of Supply Animals with
Organic Chromium, of Nellore and F1 Brangus x Nellore
Cattle on Pasture System
A. Jorge 1 , A. Polizel Neto 1 , P. Moreira 2 , A. Ramos 1 , J. Souza 3 ,
R. Pinheiro 1 , C. Francisco 1
1 UNESP- School of Veterinary Medicine and Animal Sciences,
Animal production, Botucatu, Brazil
2 UFMT, Animal Production, Sinop, Brazil
3 UFPR, Animal Science Department, Palotina, Brazil
Chromium works as component integral and biologically that
potential the insulin action in the cells, stimulating there of keep the
glycogenic and this affecting post mortem pH. The aim of this study
was evaluate the effect of the organic chromium supplementation in
the carcass pH curve and freezing, of the two racial groups of steers,
Nellore e F1 Brangus x Nellore, on pasture system. Were used two
groups composed 18 animals each (9 Nellore e 9 F 1 Brangus x
Nellore), submitted to two experimental treatments, with and
without organic chromium supplementation. The animals were
distributed in the treatments at 210 days until at 600 days of age,
when the animals were slaughed, and gauged the pH and the
temperature at 2, 10 and 24 hours after animals died. Not was
detected racial group, treatment and interaction influence to any
characteristics evaluated. The conclusion was that the organic
chromium supplementation to beef cattle, on pasture system, not
influences the carcass pH curve and temperature.
Key words: bovine, chromium, meat, minerals, supplementation
1065 Evaluation of Carcass Alteration, by Ultrasound Measures,
of Nellore and F1 Brangus x Nellore Steers Supply with
Organic Chromium in Pasture System
A. Jorge 1 , A. Polizel Neto 1 , P. Moreira 2 , A. Ramos 1 , J. Souza 3 ,
R. Pinheiro 1 , C. Francisco 1
1 UNESP School of Veterinary Medicine and Animal Sciences, Animal
Science Department, Botucatu, Brazil
2 UFMT, Animal Science Department, Sinop, Brazil
3 UFPR, Animal Science Department, Palotina, Brazil
As chromium is related to insulin, supplementing with bio available
organic molecules containing chromium could be quite important for
improving muscular growth and carcass quality. Thus the objective of
this experiment was to evaluate the carcass alterations, by ultrasound
measures of the Nellore and F 1 Brangus x Nellore steers supply with
organic chromium, in pasture system. Were used two groups with 18
animals each (9 Nellore and 9 F 1 Brangus x Nellore), submitted to two
experimental treatments: with and without organic chromium
supplementation. Were measures, in two experimental moments, at 450
(I) and 600 (II) days of age, the rib eye area (REA_I and REA_II), in
cm 2 ; the sub cutaneus fat thickness at the back and at the rump, in mm,