Revista Electrónica:
Depósito Legal: ppi 201502ZU4665 / / ISSN electrónico: 2477-944X
Revista Impresa:
Depósito Legal: pp 199102ZU46 / ISSN 0798-2259
MARACAIBO, ESTADO ZULIA, VENEZUELA
Vol. XXX (3) 2020
UNIVERSIDAD DEL ZULIA
REVISTA CIENTÍFICA
FACULTAD DE CIENCIAS VETERINARIAS
DIVISIÓN DE INVESTIGACIÓN
157
Revista Cientíca, FVC-LUZ / Vol. XXX, N° 3, 157 - 165, 2020
ABSTRACT
The objective of the present work was to evaluate the ecacy
of the compound Hemoveex® (isometamidium chloride 2,4%
and ivermectin 2,0%) of Reveex, a Venezuelan laboratory,
on the control of mixed infections of Trypanosoma vivax and
gastrointestinal nematodes in bovine. Sixteen one year old
heifers, assigned to two experimental groups (intramuscular (IM)
and subcutaneous (SC)), were treated each with Hemoveex® at
the dose of 1 mililiter (mL) /50 kg of body weight (BW); previously,
all 16 heifers had been inoculated with 5 mL each of bovine blood
showing 4 agellates/100X microscopic eld of Trypanosoma
vivax initially obtained from a cow in Puerto Berrío, Antioquia,
Colombia and further multiplied in a calf at the Jaime Isaza
Polytechnic of Marinilla, Antioquia. The assignment to either
group, was made on the basis of the “strongylid” nematode type
egg per gram (epg) of faeces, using the McMaster technique.
From day (d) 1 after treatment to d 63, when observations nished,
no trypanosomes were seen in any of the sixteen heifers. As for
the control of gastrointestinal nematodes, the association showed
ecacies of 36, 12, 24 and 84%, on d 7, 28 and 42, and 63 post-
treatment (PT), respectively, when applied by the IM route and
of 47.8, 39.1 and 78.3%, on d 21, 28 and 63 PT, respectively,
when administered (SC). Isometamidium + ivermectin was highly
ecacious against Trypanosoma vivax, given either IM or SC
presented a satisfactory anthelmintic ecacy only by d 63 PT.
Key words: Cattle; control; nematodes; test; trypanosomes
RESUMEN
El objetivo del presente trabajo fue evaluar la ecacia de la
mezcla (cloruro de isometamidio al 2,4% e ivermectina al 2,0%)
del laboratorio Reveex de Venezuela, en el control de infecciones
por Trypanosoma vivax y nemàtodos gastrointestinales en
bovinos. Dieciséis bovinos de aproximadamente 1 año de edad
divididos en dos grupos, por vía de inoculación intramuscular
y subcutánea, fueron tratados con la mezcla isometamidio +
ivermectina a la dosis de 1 mililitro (mL)/50 kg peso corporal; antes
del tratamiento los 16 animales fueron inoculados vía venosa con
5mL cada uno, de sangre con una parasitaemia de 4 parásitos por
campo en frotis de sangre coloreado con Giemsa, de una cepa
de Trypanosoma vivax adquirida en un bovino de Puerto Berrío,
Antioquia, Colombia y multiplicada en un ternero en el Politécnico
Colombiano Jaime Isaza Cadavid de Marinilla, Antioquia. La
división de los grupos se hizo teniendo en cuenta los huevos de
parásitos gastrointestinales tipo “strongylida” por gramo de heces,
mediante la técnica de McMaster. Desde un día (d) después del
tratamiento, hasta el d 63, cuando nalizaron las observaciones,
en ninguno de los 16 animales se observaron tripanosomas. Con
respecto al control de parásitos gastrointestinales, el producto
mostró ecacias de 36; 12; 24 y 84% en los 17; 28; 42 y 63 post-
tratamiento (PT), respectivamente, cuando se aplicó por vía
intramuscular (IM) y de 47,8; 39,1 y 78,3% en los d 21; 28 y 63
PT, respectivamente, cuando se aplicó por vía subcutánea (SC).
La mezcla isometamidio+ ivermectina resultó altamente ecaz
contra Trypanosoma vivax; administrada tanto por vía IM; como
SC y presentó una ecacia antihelmíntica satisfactoria sólo hacia
el d 63 PT.
Palabras clave: Control; ganado; nematodos; prueba;
tripanosomas
EVALUATION OF TRYPANOCIDAL AND ANTHELMINTIC EFFICACY OF
AN ISOMETAMIDIUM – IVERMECTIN ASSOCIATION IN BOVINE
EVALUACIÓN DE LA EFICACIA TRIPANOCIDA Y ANTIHELMÍNTICA DE UNA ASOCIACIÓN DE
ISOMETAMIDIUM E IVERMECTINA EN BOVINOS
Gustavo López-Valencia; Jesús Antonio Betancourt-Echeverry
2
; Elias Ascanio-Evano
3
; William Berrío-Cataño
4
; Andrés Felipe
Velásquez-Arboleda
5
; Jorge Gómez-Oquendo
6
and
7
Gustavo Alonso López-Sierra
7
Estadístico
1
Investigador independiente
2
Escuela de Microbiología y Bioanálisis, Facultad de Salud Universidad Industrial de Santander
3
Facultad
de Ciencias Veterinarias, Universidad Central de Venezuela; Asesor Investigación y Desarrollo Reveex Group
4
Dirección de Granjas,
5
Politécnico Colombiano Jaime Isaza Cadavid,
6
Politécnico and
7
Colombiano Jaime Isaza Cadavid Director en GSBPO Chile.
E-mail: gulova851@gmail.com
Recibido: 24/03/2020 Aceptado: 10/09/2020
158
Use of biooc technology nn the production / Gregorio, J. y col.
INTRODUCTION
Both, internal (gastrointestinal, pulmonary, hepatic, hematic,etc.)
and external (ticks, ies, lice, mites, etc.) cause high economic
losses to cattle industry worldwide.
Bovine (Bos taurus) trypanosomosis in Africa (caused mainly
by Trypanosoma vivax (T. vivax) and Trypanosoma congolense),
only in the Tse-Tse y belt, causes losses estimated in United
States of America (USA) $ 4,75 billions/year (yr) [18]. In Colombia
[5], where the disease is endemic in regions like Inter Andean
Valleys, Middle Magdalena, Caribbean Coast and Eastern Plains
[6], several studies conrm the economic importance of the disea-
se. Betancourt and Wells [8] recall an episode of trypanosomosis
in a dairy in the Cauca Valley where losses went up to USA$
5,654. Studies conducted in the State of Cordoba in 1996 found
that, in three months, calves infected with T. vivax, gained an ave-
rage of 6.0 kg less than non infected calves [1, 34].
Gastrointestinal worms severely aect the productivity of cattle
ranches, since it produces anorexia, loss of blood and plasmatic
proteins, lung damage, metabolic disturbance, diarrhea, and re-
tarded growth [14, 40].
In South America, the control of bovine trypanosomosis has
been based for many years on diminazene aceturate and, more
recently on isometamidium chloride [11,12].. Both compounds are
of common use also in Africa [24, 25, 29] and are marketed as
single molecules. Control of gastrointestinal parasitism (GIP) is
mainly done with benzimidazol derivatives (albendazol, fenben-
dazol and others), imidazotiazols (levamisol, tetramizol), macro-
ciclic lactones (Ivermectinas, milbemicines), organophosphates
(haloxon, triclorfon). All of them are also sold as single molecules.
[13, 27, 33].
The colombian veterinary market does not have a compound
containing both, isometamidium and ivermectin. Such a product
would be useful, considering that a high worm burden produces
immunodepression and could complicate a trypanosomosis clini-
cal episode. Reveex Laboratory has developed a mixed product
containing both drugs. It is expected that the product, while con-
trolling gastrointestinal parasitism, favors the preventive and cu-
rative eect on trypanosomes. The present work was conducted
to evaluate the ecacy of isometamidium and ivermectin combi-
nation, on the control of mixed infections by gastrointestinal para-
sites (GIP) and T. vivax in cattle.
Trypanosomosis
Bovine trypanosomosis produced by T. vivax is known in Co-
lombia since 1931 [37, 49] and it is considered endemic in regions
like: the Atlantic Coast, Cauca and Magdalena River Valleys and
the Eastern Planes [6, 22, 34, 46] in warm zones and under 1500
meters above sea level (m.a.s.l). Recently the presence of the
parasite was reported in cattle in Antioquia, at 2.486 m.a.s.l. [50].
The disease has a strong economic impact due to abortions,
anaemia, reduction of milk yield and control costs. [ 3, 4, 8, 9,
16, 34, 47].
Gastrointestinal parasites
Most known nematode genera have been reported in associa-
tion with GIP in cattle in Colombia. In the Eastern Planes, Coope-
ria, Haemonchus, Ostertagia, Oesophagostomum, Trichostron-
gylus, Trichuris, Bunostomum, Capillaria, Agriostomum, Toxocara
and Mecistocirrus have been found by dierent workers [32, 35,
39, 44]. In the Atlantic Coast, the genera Strongyloides, Toxoca-
ra, Cooperia, Haemonchus, Mecistocirrus, Oesophagostomum,
Bunostomum, and Ostertagia have been registered in Cordoba
State and the genera Strongyloides, Haemonchus, and Trichos-
trongylus in Cesar State [36, 41].
In the Middle Magdalena the genera Strongyloides, Coope-
ria, Ostertagia, Haemonchus, Oesophagostomum, Trichostron-
gylus and Bunostomum have also been found [13]. Another stu-
dy conducted in Santander State, found that the most common
nematodes infecting bovine in the García Rovira Province were
Toxocara, Cooperia, Haemonchus, Ostertagia, Nematodirus and
Trichostrongylus [38].
Generally speaking, GIP is more prevalent and severe in young
calves. Villar and Arguelles [43], found the highest counts of eggs
in faeces in calves 105 to 130 days (d). Some genera, like To-
xocara and Strongyloides, are more common in younger calves
[41, 44].
As for anthelmintics used in controlling GIP worms in bovine,
studies in a milk producing area of Boyacá, found that Albendazol
was the most commonly used (30%) [47], followed by ivermectin
(14%) and levamisol (7%) [33]. Another work reported the oral
use of 1% diatomaea sands as anthelmintic for cattle and repor-
ted 84 and 100% reduction in egg per gram (epg) of faeces count
on d 90 and 135, respectively [28]. Marquez et al. [30], repor-
ted anthelmintic resistance in 25% of the farms examined at the
Altiplano Cundiboyacense region. Resistance to albendazol and
ivermectin was reported on 17 and 8% of these farms, respecti-
vely.
MATERIALS AND METHODS
The study was conducted at the Román Gómez Farm of the
Jaime Isaza Cadavid Polytechnic in Marinilla, Antioquia located
at 6º11’47” North; 75º 20´ 0” West.
The drug tested: The Hemoveex
®
(Reveex Laboratories, Vene-
zuela), compound tested on its trypanocidal and anthelmintic e-
cacy, is an association of isometamidium chlorhidrate 2,4% and
ivermectin 2,0%. Ivermectin is an endectocide known for over 30
years. It works by stimulating the presynaptic GABA relaxation
with the resultant blockage of the nervous impulse in the post-
159
Revista Cientíca, FVC-LUZ / Vol. XXX, N° 3, 157 - 165, 2020
synaptic transmission, leading to paralysis and death of the pa-
rasite. According to Gregorio’s description, ivermectin binds to Cl
ions regulated by glutamate (GluCl) located in muscular and ner-
vous cells of invertebrates. This interaction leads to an increase in
the permeability to Cl- causing membrane hyperpolarization with
paralysis and death of the parasite [21]. As for isometamidium, in
the market for more than 50 yr, its mode of action is not fully un-
derstood. It is believed that selectively inhibits the kinetoplastic II
topoisomerase of the trypanosome [10, 26]. Isometamidium also
blocks nucleic acid synthesis [45]. Ivermectin and isometamidium
have very dierent loci of action and work on very dierent pro-
cesses; this discards any possible interaction between them.
Trypanosoma vivax strain: A T. vivax working strain was origi-
nally obtained from a natural infection in a cow at Puerto Berrío,
Antioquia and kept in liquid nitrogen at the CES, Colombian Insti-
tute of Tropical Medicine.
Gastrointestinal nematodes: The study was performed using
the natural nematode infections present in the calves when obtai-
ned for the study. Worm burdens were estimated on the basis of
epg of faeces count using the McMaster Technique as described
by Dunn [17]. Segmented eggs were named “strongylid” type, a
term that includes eggs of the genera Haemonchus, Trichostron-
gylus, Ostertagia, Cooperia, Mecistocirrus, Nematodirus, Bunos-
tomum and Oesophagostomum given the diculty in telling them
apart.
Experimental animals: Sixteen one year old heifers, Bos taurus
crosses, with an average weight of 140 kilograms (kg) were ob-
tained, kept stabled in the farm’s facilities and fed fresh chopped
grass, hay and commercial ration (2 kg/animal/d), salt and water
ad libitum.
Inoculations with T. vivax: A heifer (Num. 0054) was treated on
three consecutive d, with dexamethasone by the ntramuscular
(IM) route, at a dose rate of 0.1 miligrams (mg) /kg of body weight,
and then inoculated intravenously (IV) with 5 mililiters (mL) of
blood containing the working strain of T. vivax with a parasitae-
mia of 4.5 agellates/100 X microscopic elds using an Olym-
pus CX31 Japan equipment, as seen in a thin smear stained with
Giemsa. From here onward, the blood of the heifer was examined
daily or every other day to look for trypanosomes (in 50 microsco-
pic elds of a thin smear) and to determine the haematocrit value.
Body temperature was also measured at the same time. Once a
high parasitaemia was observed, the reamining 15 heifers were
inoculated IV, with 5 mililiters (mL) each of blood from heifer 0054,
and monitored as described to determine clinical (temperature),
haematological (haematocrit) and parasitologic (parasitaemia)
values. Once parasitaemia with T. vivax was evident, all heifers
were treated, either IV or IM, with Hemoveex®, at a dose rate of
1mL/50 kg BW, and monitored as described, on d [3, 7, 14, 21,
28, 42 and 63] post-treatment (PT).
Gastrointestinal parasites (GIP): On the same day of treatment
with isometamidium + ivermectin, all heifers were examined for
gastrointestinal nematodes, using the McMaster technique. The
heifers were assigned to either SC or IM group, depending on the
route by which the compound would be applied. On the same d, a
pool of faeces from those heifers showing the highest epg counts
was submitted to cultivation by the Corticelli and Lai technique as
described by Niec [31], to obtain L3 nematode larvae for further
genera identication. Monitoring of GIP was done on the same
PT d, described for T. vivax, and expressed in terms of epg of the
“strongylid” type.
Ecacy: The ecacy of treatments was estimated as percen-
tage parasitaemia and epg on each PT d, as compared with pre-
treatment values for the same variables.
Weight gain: Body weight for each heifer was measured both,
at the beginning and at the end of the study.
Statistical analysis Temperature, parasitaemia and haematocrit
values, as well as eggs per gram (epg) and body weight data,
before and after treatment, were compared by using the ANOVA
test (analysis of variance), and accepting a signicance level of
0,05 (5% error). All statistical calculations were made with the aid
of the STATA program [2].
RESULTS AND DISCUSSION
Trypanosomes in donor heifer 0054
On d 11 post-inoculation, heifer 0054 presented a haemato-
crit of 26%, a body temperature of 39,0ºC and a parasitaemia of
4,5 trypanosomes/eld in a blood-stained smear. On this d, blood
was collected with Ethylene Diamine Tetraacetic Acid (EDTA) as
anticoagulant to inoculate the 15 remaining experimental bovi-
nes. Each heifer received IV 5 mL of parasitemic blood and was
assigned to either the IM or the SC group.
Trypanosomes in the experimental heifers
On d six after inoculation, all heifers showed parasitaemia with
T. vivax. The IM group, presented an average parasitaemia of
2.6 trypanosomes/eld and the SC group presented an average
parasitaemia of 5 trypanosomes/eld on stained blood smears.
The incubation period observed for T. vivax in the present work,
was similar to that reported by dierent researchers in Africa and
America [3, 6, 15, 23], especially when the infection is the result
of IV inoculation.
On d 7 PT, eight heifers were treated IM and the remaining
eight heifers SC, with isometamidium + ivermectin association at
a dose rate of 1mL/50 kg of body weight. From d 1 PT to d 63
PT, no trypanosomes were seen in any of the experimental hei-
fers with the Woo´s [48] and Giemsa stained blood parasitological
techniques employed. Parasitaemia readings on d 0 (treatment
day) and until d 63 PT are presented on TABLES I and II, for the
160
Use of biooc technology nn the production / Gregorio, J. y col.
IM and SC groups, respectively.
Ecacy
The absence of trypanosomes in the blood of all heifers from
d 1 to d 63 PT, both in the IM and SC groups, demonstrated that
under the conditions of the present study the association was
100% ecacious in controlling T. vivax infections in bovine, at
least until d 63 PT. The early, 24 (h) curative eect provided by
isometamidium has also been reported [42] and its ecacy as
preventive and curative of infections with the parasite, as well as
its long lasting protection, up to six months has been previously
documented corchetes, [8, 11, 12, 15, 19, 20, 24, 29, 42].
Temperature readings
In the IM group, on the d of administration, being T. vivax
present, ve, out of eight heifers presented a body temperature
≥ 39ºC, with an average for the group of 39.2ºC. From here on,
averages of body temperature for the group were 38.8, 38.5,
38.3, 38.6, 38.8, 38.5 and 39.0ºC for the d 3, 7, 12, 14, 19, 21, 28,
42 and 63 PT, respectively (FIG 1).
n the SC group, on the day of the administration, being T. vivax
present in all heifers, seven of eight animals had a body tempera-
ture ≥ 39.1ºC, with an average for the group of 39.4ºC. From here
on, except for two heifers on d 3 PT, and one with wild behaviour
TABLE I
Trypanosoma vivax PARASITAEMIA IN HEIFERS TREATED WITH
ISOMETAMIDIUM – IVERMECTIN BY THE INTRAMUSCULAR (IM) ROUTE
Trypanosomes (N x microscopic eld)
Identication Experimental Days
Animal Number 0 3 7 14 21 28 42 63
168 3,6 0 0 0 0 0 0 0
185 3,0 0 0 0 0 0 0 0
194 4,0 0 0 0 0 0 0 0
190 1,0 0 0 0 0 0 0 0
177 0,8 0 0 0 0 0 0 0
182 1,4 0 0 0 0 0 0 0
054 4,5 0 0 0 0 0 0 0
180 2,5 0 0 0 0 0 0 0
Total 20,8 0 0 0 0 0 0 0
Average 2,6 0 0 0 0 0 0 0
TABLE II
Trypanosoma vivax PARASITAEMIA IN HEIFERS TREATED WITH
ISOMETAMIDIUM-IVERMECTIN BY THE SUBCUTANEOUS ROUTE
Trypanosomes (N x microscopic eld)
Identication Experimental Days
Animal Number 0 3 7 14 21 28 42 63
183 13,0 0 0 0 0 0 0 0
187 1,6 0 0 0 0 0 0 0
009 15,0 0 0 0 0 0 0 0
186 3,8 0 0 0 0 0 0 0
179 0,1 0 0 0 0 0 0 0
189 2,0 0 0 0 0 0 0 0
192 2,5 0 0 0 0 0 0 0
175 2,2 0 0 0 0 0 0 0
Total 40,2 0 0 0 0 0 0 0
Average 5,0 0 0 0 0 0 0 0
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Revista Cientíca, FVC-LUZ / Vol. XXX, N° 3, 157 - 165, 2020
which was always hyperthermic, body temperature was normal,
with averages of 38.7, 38.2, 38.4, 38.6, 38.8, 38.4 and 38.7ºC on
d 3, 7, 14, 21, 28, 42 and 63 PT, respectively (FIG. 1).
FIGURE 1. AVERAGE BODY TEMPERATURE ON HEIFERS
TREATED WITH ISOMETAMIDIUM + IVERMECTIN BY
INTRAMUSCULAR OR SUBCUTANEOUS ROUTE.
Haematocrit values
In the IM group, on the d of the administration, haematocrit
values were normal, with an average for the group of 36.9%. From
here on, the haematocrit increased until d 63 PT, with averages of
38.4, 45.4, 47.2, 50.6, 42.9, 45.2 and 49.1% for d 3, 7, 14, 21, 28,
42 and 63 PT, respectively (FIG. 2).
FIGURE 2. AVERAGE HAEMATOCRIT VALUES IN HEIFERS
TREATED WITH ISOMETAMIDIUM + IVERMECTIN BY
INTRAMUSCULAR OR SUBCUTANEOUS ROUTES.
In the SC group, on the d of treatment with isometamidium-
ivermectin, the haematocrit values were normal, with an average
for the group of 34.7%. From here on, the haematocrit increased
reaching average values of 35.0, 41.4, 43.2, 46.2, 43.2, 44.5 and
46.5% for d 3, 7,14, 21, 28, 42 and 63 PT, respectively (FIG. 2).
Gastrointestinal parasitism
Although early in the study Moniezia eggs and Eimeria oocysts
were seen in some animals; they were not included in the results,
since isometamidium + ivermectin has no eect on this type of
parasites.
“Strongylid” type egg counts in both treated groups are
presented in TABLES III and IV and FIG. 3. In the IM group, initial
epg counts averaged 312.5. In terms of ecacy, the compound
showed reduction of GIP on d 7, 28, 42 and 63 PT, the average
ecacies being 36, 12, 24 and 84%, respectively. On d 14 PT,
there was a marked increase in the epg values for the group,
possibly due to eggs laid by adult worms that were on the larval
stage in the intestinal mucose, on the day of the treatment (TABLE
III).
Nematode eggs obsrvedin the feces ofheifers in the presnt work,
were al lof the “strongylid” type, which includes many of the
genera reported by other workers [5,13,32,35,36,38,41,44]
In the SC group, initial epg counts averaged 287.5. In terms
of ecacy, the compound showed reduction of GIP on d 21,
28 and 63 PT, with average ecacies of 47.8, 39.1 and 78.3%,
respectively (TABLE IV and FIG. 3). As seen in the IM group,
on d 14 there was also an increase in the epg count, possibly
due to eggs laid by adult worms that were on the larval stage in
the intestinal mucose on the day of the treatment (TABLE IV).
Though no specic anthelmintic resistance tests were performed,
the results suggest the existence of the phenomenon which has
already been reported in Colombia [30].
FIGURE 3. AVERAGE “STRONGYLID” TYPE EGGS
PER GRAM OF FAECES IN HEIFERS TREATED WITH
HEMOVEEX® BY INTRAMUSCULAR OR SUBCUTANEOUS
ROUTE.
Cultivation of faeces
Cultivation of faeces yielded no L3 nematode infective larvae.
For this reason, identication of nematode genera was not
possible.
Statystical analysis
ANOVA test [2] did not show statistical (P<0.05) dierence
between IM and SC groups for the variables: parasitaemia with T.
vivax, body temperature, haematocrit, nematode egg counts and
weight gain.
162
Use of biooc technology nn the production / Gregorio, J. y col.
Undesirable reactions
No systemic or local undesirable reactions were detected in any
of the heifers treated with the association, neither on the d. of
treatment, nor on any of the post treatment d.
Weight gain
TABLES V and VI present the wight values for each heifer at
the beginning and the end of the study in the IM and SC groups,
respectively. Connement and suering clinical tripanosomosis
did not seem to have severely aected weight gain. In the IM
group, average weight gain was 43.6 kg whilst in the SC group, it
was 42.1 kg, during the 63 d of the study.
CONCLUSIONS
Isometamidium + ivermectin association was 100% ecacious in
controlling T. vivax infections in cattle from the days following IM
or SC administration to d 63 PT.
Body temperature and haematocrit values signicantly improved
in all trypanosome infected bovine after treatment.
TABLE IV
NUMBER OF STRONGYLID TYPE EGGS PER GRAM OF FAECES IN HEIFERS
TREATED WITH ISOMETAMIDIUM - IVERMECTIN BY THE SUBCUTANEOUS ROUTE
Strongylid type (epg)
Identication Experimental Days
Animal number 0 3 7 14 21 28 42 63
183 550 550 400 700 300 200 400 150
187 100 0 600 500 0 200 300 0
009 350 350 600 500 300 100 400 250
186 0 600 300 200 0 100 100 0
179 50 250 300 100 200 200 500 100
189 350 300 500 500 0 100 100 0
192 650 400 200 700 300 200 300 0
175 250 200 200 300 100 300 300 0
Total 2300 2650 3100 3500 1200 1400 2400 500
Average 287,5 331,25 387,5 437,5 150 175 300 62,5
Ecacy % - 0 0 0 47,8 39,1 0 78,3
TABLE III
NUMBER OF STRONGYLID TYPE EGGS PER GRAM OF FAECES IN HEIFERS
TREATED WITH ISOMETAMIDIUM-IVERMECTIN BY THE INTRAMUSCULAR ROUTE
Strongylid type (epg)
Identication Experimental Days
Animal number 0 3 7 14 21 28 42 63
168 700 400 200 200 300 200 300 50
185 400 400 300 1,600 800 500 100 50
194 100 250 200 400 300 200 200 50
190 350 50 300 1,400 200 500 300 50
177 250 0 100 0 0 100 100 0
182 350 400 200 500 500 200 600 0
054 100 250 100 100 200 200 300 150
180 250 900 200 400 200 300 0 50
Total 2500 2650 1600 4600 2500 2200 1900 400
Average 312,5 331,25 200 575 312,5 275 237,5 50
Ecacy % - 0 36 0 0 12 24 84
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In the rst 21 d PT with the association given IM and 14 d PT
given SC, anthelmintic ecacy of the compound was low, but
then increased by d 63 PT and reached values of 84 and 78.3%,
respectively.
The study did not reveal any dierence in ecacy against
trypanosomes and GIP nematodes between heifers treated by
the IM or the SC route.
It seems that isometamidium + ivermectin, prevented weight
loss in bovine suering a clinical episode of tripanosomosis and
a simultaneous infection with GIP nematodes. All treated heifers
had gained weight signicantly during the duration of the study.
The association did not cause any local or systemic undesirable
reactions in bovine during the 63 d following its administration
either by the IM or the SC route.
ACKNOWLEDGMENTS
The excellent collaboration of the sta and operative support
personnel of the Jaime Isaza Cadavid Polytechnic in the Marinilla
Farm and the nantial and logistic support of Reveex, are highly
appreciated.
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TABLE VI
INITIAL AND FINAL BODY WEIGHT VALUES IN HEIFERS TREATED WITH
ISOMETAMIDIUM - IVERMECTIN BY THE SUBCUTANEOUS ROUTE
Animal Number Initial Body Weight Final Body Weight
183 181 239
187 138 190
009 120 150
186 148 168
179 150 179
189 136 174
192 144 216
175 148 186
Total 1,165 1,505
Average 145,6 187,7
164
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Vol, XXX, N
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