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Animal Genetics   Research Article

Is the number of antennal plate organs (sensilla placodea) greater in hygienic than in non-hygienic Africanized honey bees?

Authors: Kátia Peres Gramacho, Lionel Segui Gonçalves, Antônio Carlos Stort, Adriana Backx Noronha

Hygienic behavior is a desirable trait in honey bees (Apis mellifera L.), as hygienic bees quickly remove diseased brood, interrupting the infectious cycle. Hygienic lines of honey bees appear to be more sensitive to the odors of dead and diseased honey bee brood, and Africanized honey bees are generally more hygienic than are.. Read More»

Genet. Mol. Res. 2(3):
Animal Genetics   Research Article

Effects of crude extracts of Agaricus blazei on DNA damage and on rat liver carcinogenesis induced by diethylnitrosamine

Authors: Luís Fernando Barbisan, Clarissa Scolastici, Maristela Miyamoto, Daisy Maria Favero Salvadori, Lúcia Regina Ribeiro, Augusto Ferreira da Eira, João Lauro Viana de Camargo

The effects of crude extracts of the mushroom Agaricus blazei Murrill (Agaricaceae) on both DNA damage and placental form glutathione S-transferase (GST-P)-positive liver foci induced by diethylnitrosamine (DEN) were investigated. Six groups of adult male Wistar rats were used. For two weeks, animals of groups 3 to 6 were trea.. Read More»

Genet. Mol. Res. 2(3):
Animal Genetics   Research Article

Relationships of weight and height with age in hybrid Holstein-Friesian/Guzera females

Authors: F.E. Madalena, R.L. Teodoro, A.P. Madureira

Serial data on live weights, height at withers and the weight/height ratio of 263 cows (3 to 9 years old) and 196 heifers (2 to 5 years old) were studied. The animals were of six red and white Holstein-Friesian (HF)/Guzera crosses (1/4, 1/2, 5/8, 3/4, 7/8 and ≥31/32 HF-expected gene fraction). Separate analyses were perform.. Read More»

Genet. Mol. Res. 2(3):
Animal Genetics   Research Article

Comparing data on the reproduction of Varroa destructor

Authors: Maria H. Corrêa-Marques, Luis Medina Medina, Stephen J. Martin, D. De Jong

Varroa destructor reproductive success is considered an important character for determining the resistance of honey bees to this mite parasite. However, most of the published data are not comparable due to the different methods of ascertaining and reporting reproduction. A recently published technique that involves reconstruct.. Read More»

Genet. Mol. Res. 2(1):
Animal Genetics   Research Article

Growth hormone mRNA expression in the pituitary of Bos indicus and Bos taurus x Bos indicus crossbred young bulls treated with recombinant bovine somatotropin

Authors: S.M.Z. Di Mauro, L.R. Furlan, M.I.T. Ferro, M. Macari andJ.A. Ferro

The effects of breed and of recombinant bovine somatotropin (rbST) treatment on growth hormone gene expression were studied in young bulls. The experiment was completely randomized in a [2 x 2]-factorial arrangement, using two levels of rbST (0 or 250 mg/animal/14 days), and two breed groups (Nelore and Simmental x Nelore cros.. Read More»

Genet. Mol. Res. 1(4):
Animal Genetics   Research Article

New genomic resources for the honey bee(Apis mellifera L.): development of a deep-coverage BAC library and a preliminary STC database

Authors: J.P. Tomkins, M. Luo, G.C. Fang1, D. Main1, J.L. Goicoechea,M. Atkins, D.A. Frisch, R.E. Page, E. Guzmán-Novoa5, Y. Yu,G. Hunt6 and R.A. Wing

We have constructed a bacterial artificial chromosome (BAC) library for a European honey bee strain using the cloning enzyme HindIII in order to develop resources for structural genomics research. The library contains 36,864 clones (ninety-six 384-well plates). A random sampling of 247 clones indicated an average insert size o.. Read More»

Genet. Mol. Res. 1(4):
Animal Genetics   Research Article

(Co)variance components, genetic parameters and annual trends for calf weights in a Brahman herd kept on floodable savanna

Authors: Dieter Plasse1, Omar Verde, Jesús Arango, Luis Camaripano, Hugo Fossi, Rafael Romero, Carlos Rodriguez M. and José L. Rumbos

(Co)variance components and genetic parameters were estimated for body weights of an elite Brahman herd under a designed, supervised management and genetic program, including strategic artificial insemination (AI). Restricted maximum likelihood methods were used with a univariate animal model for birth weight (BW) and a bivari.. Read More»

Genet. Mol. Res. 1(4):
Animal Genetics   Research Article

Decreased flight performance and sperm production in drones of the honey bee (Apis mellifera) slightly infested by Varroa destructor mites during pupal development

Authors: Pedro Duay, D. De Jong, Wolf Engels

We developed a bioassay to measure the flying power of drone, in order to determine which drones could reach a drone congregation area. A wind tunnel was used to test unparasitized drones and drones slightly parasitized by one or two mites during pupal development, and counts were made of the number of spermatozoa that they pr.. Read More»

Genet. Mol. Res. 1(3):
Animal Genetics   Research Article

Female remating, sperm competition and sexual selection in Drosophila

Authors: Shree Ram Singh, Bashisth N. Singh and Hugo F. Hoenigsberg

Female remating is fundamental to evolutionary biology as it determines the pattern of sexual selection and sexual conflict. Remating in females is an important component of Drosophila mating systems because it affects sperm usage patterns and sexual selection. Remating is common in females of many species of Drosophila in bot.. Read More»

Genet. Mol. Res. 1(3):
Animal Genetics   Research Article

Varroa-tolerant Italian honey bees introduced from Brazil were not more efficient in defending themselves against the mite Varroa destructor than Carniolan bees in Germany

Authors: M.H. Corrêa-Marques, D. De Jong, P. Rosenkranz andL.S. Gonçalves

In Europe and North America honey bees cannot be kept without chemical treatments against Varroa destructor. Nevertheless, in Brazil an isolated population of Italian honey bees has been kept on an island since 1984 without treatment against this mite. The infestation rates in these colonies have decreased over the years. We l.. Read More»

Genet. Mol. Res. 1(2):