| 1. |
- De Oliveira, Daiana
(författare)
-
Effect of cypermethrin on the control of lesser mealworm (Alphitobius diaperinus) and broiler performance
- 2021
-
Ingår i: Pesquisa Veterinária Brasileira. - 0100-736X .- 1678-5150. ; 41
-
Tidskriftsartikel (refereegranskat)abstract
- This study analysed the effectiveness of using different levels of a product based on 6% cypermethrin and 2% citronella on broiler production and control the lesser mealworm (Alphitobius diaperinus). A total of 648 one-day-old chicks (Cobb (R)) which were allocated to one of three treatments (no application of the commercial product- control, and two concentrations of the product 2.00 and 3.33g/m(2)) in eight replicates with 27 birds each. The commercial product, which was based on cypermethrin was applied in the chambers with an atomizer. The lesser mealworm population was sampled weekly (1,7,14, 21, 28,35 and 42 days of the experiment) using traps, at three points (front, middle and back) inside the pen. The performance, carcass and cut yields were evaluated. At 21, 28, 35 and 42 days of the experiment, the number of lesser mealworm adults and larvae was lower in the treatment groups involving 2.00 and 3.33g/m(2) of the product than in the control group. On the first and 14th days of the study, the number of lesser mealworms adults was lower in the group treated with 3.33g/m(2) of the product compared to the control group, although the results did not differ statistically from those obtained with 2.00g/m(2) of the product. In conclusion, the application of the commercial product at both concentrations (2.00 and 3.33g/m(2)) was effective in combating Aiphitobius diaperinus adults and larvae, and the performance was not influenced by treatments.
|
|
| 2. |
|
|
| 3. |
- Rêgo, Mariana G., et al.
(författare)
-
Morphological description of ovary and uterus of the nurse shark (Ginglymostoma cirratum) caught off at the Fortaleza coast, Northeast Brazil
- 2019
-
Ingår i: Pesquise Veterinaria Brasileira. - 0100-736X .- 1678-5150. ; 39:12, s. 997-1004
-
Tidskriftsartikel (refereegranskat)abstract
- The nurse shark, Ginglymostoma cirratum (Bonnaterre, 1778) is one of the most studied species of elasmobranchs. However, the knowledge of their reproductive biology is still relatively rare, particularly in the western South Atlantic. This study aimed to describe the morphology of the uterus and the ovary of G. cirratum, based on specimens caught off at the Fortaleza/CE coast, northeast Brazil. Samples were collected from September 2012 to June 2013, from regular landings of artisanal fishing, which commercialize this species freely. A total of ten females were collected. The methodologies followed for analyzing the ovaries and uterus of those females included both macroscopic and histological analysis. G. cirratum has internal type ovary morphology, with invaginations of connective tissue, which defines compartments and separate oocyte groups in ovigerous lots. The epithelium lining the ovary changes from simple columnar ciliated in the area without ovigerous lots, which turns into a simple cubic epithelium in the coating portion of the epigonal organ where ovarian tissue is absent. The uterine mucosa has secretory cells denoted by Alcian Blue staining, indicating the production of mucopolysaccharides, even in immature individuals. This lecithotrophic shark has a uterine vascularized mucosa that is one characteristic of viviparous elasmobranch species.
|
|
| 4. |
- Ståhl, Karl
(författare)
-
Genetic diversity of bovine viral diarrhoea virus (BVDV) from Peru and Chile
- 2009
-
Ingår i: Pesquisa Veterinária Brasileira. - 0100-736X .- 1678-5150. ; 29, s. 41-44
-
Tidskriftsartikel (refereegranskat)abstract
- Twenty-five BVDV strains, detected in serum from persistently infected cattle from Peru (n=15) and Chile (n=10) were genetically characterized. The phylogenetic analysis based on the 5' UTR showed that all 25 strains belonged to genotype 1. Twenty-three of the strains could further be subdivided into subtype 1b, and two out of ten Chilean strains into subtype 1a. In conclusion, in total 23 out of 25 strains analyzed were of genotype 1, subtype 1b. This is the predominant BVDV subtype in many countries all over the world, including USA. The close homology with previously described strains reflects the influence of livestock trade on the diversity of BVDV circulating within and between countries and continents. Peru and Chile have imported large numbers of cattle from USA and Europe, mostly with insufficient or lacking health documentation.
|
|
