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Dive into the research topics where A. O. A. Silva is active.

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Featured researches published by A. O. A. Silva.


Pesquisa Veterinaria Brasileira | 1999

Ocorrência da leucose enzoótica dos bovinos no Estado do Pará, Brasil

Éva Molnár; László Molnár; Hilma Lúcia T. Dias; A. O. A. Silva; William Gomes Vale

The occurrence of the infection with Bovine Leukosis Virus (BLV) was examined in agar-gel immunodiffusion (AGID) test and with indirect enzyme-linked immunosorbent assay (ELISA), in the State of Para, Brazil. The blood sera were collected from different breeds including Nelore, Piemontes, Simental, Holstein Frisian, Indubrasil, Girolanda, Simbrasil and their cross-breedings. The majority of the animals were adults. The overall occurrence of infections was 49.8% (359/721) and 26.0% (174/668) for ELISA and AGID test, respectively. All animal groups examined showed infection in ELISA, however in the AGID test two groups were sera negative.


Andrologia | 2018

Testicular thermoregulation, scrotal surface temperature patterns and semen quality of water buffalo bulls reared in a tropical climate

L. K. X. Silva; J. S. Sousa; A. O. A. Silva; J. B. Lourenço Junior; C. Faturi; Lucieta Guerreiro Martorano; I. M. Franco; M. H. A. Pantoja; D. V. Barros; Alexandre Rossetto Garcia

This study evaluated the capacity of thermoregulation and its consequences on the scrotal surface temperature patterns and semen quality of buffalo bulls raised in a wet tropical climate. Eleven water buffaloes were evaluated in the rainiest, in the transitional and in the less rainy season. Air temperature and humidity were consistently high, but the animals did not show thermal stress in any season. The scrotal temperature gradient of buffalo bulls using infrared thermography was described, and three parallel and decreasing thermal bands were characterised. Sperm quality (n = 176 ejaculates) was maintained in normal parameters over the periods. Pearsons coefficients showed that sperm volume and progressive motility were negatively correlated with ocular globe, epididymal tail and minimum scrotal temperatures (p < .01). Sperm membrane integrity was negatively influenced by increases in epididymal tail and minimum scrotal temperatures (p < .01). Ocular globe temperature also showed positive correlation with rectal, spermatic cord, and epididymal tail temperatures (p < .01). Therefore, even under high temperature and humidity, the thermoregulatory system was effective in preventing heat stress and the normality of scrotal surface temperatures, spermatogenesis and sperm maturation were maintained.


Tropical Animal Health and Production | 2015

Evaluation of thermal comfort, physiological, hematological, and seminal features of buffalo bulls in an artificial insemination station in a tropical environment.

Daniel Vale Barros; Lilian Kátia Ximenes Silva; José de Brito Lourenço; A. O. A. Silva; André Guimarães Maciel e Silva; Irving Montanar Franco; Carlos Magno Chaves Oliveira; Patrícia Tholon; Lucieta Guerreiro Martorano; Alexandre Rossetto Garcia


Proceedings of the 1st Buffalo Symposium of Americas, Belém, Pará, Brazil, 1-4 September 2002 | 2002

Arrested development of the mesonephric ducts in a Murrah buffalo bull.

W. G. Vale; A. O. A. Silva; J. S. Sousa; W. L. A. Pereira; A. N. Magalhães; C. M. C. Oliveira; H. F. L. Ribeiro; J. de B. Lourenço Júnior; O. M. Ohashi


Proceedings of the 1st Buffalo Symposium of Americas, Belém, Pará, Brazil, 1-4 September 2002. | 2002

Preliminary report on ringer-lactate solution as an alternative diluter for buffalo semen.

A. O. A. Silva; A. V. Mota; H. F. L. Ribeiro; J. S. Souza; A. N. Reis; W. G. Vale; J. de B. Lourenço Júnior; O. M. Ohashi


Semina-ciencias Agrarias | 2017

Comparative evaluation between the extenders TES-TRIS and ACP- 112 ® and the association of Sálva Marajó oil (Lippia origanoides) in the quality of cryopreserved buffalo sperm

Adriana Novaes dos Reis; M. S. Miranda; Lílian Kátia Ximenes Silva; A. O. A. Silva; José Silva de Sousa; Eziquiel de Morais; Alexandre Rossetto Garcia; Sheyla Farhayldes Souza Domingues; Joyce Kelly R. da Silva; H. F. L. Ribeiro


Animal reproduction | 2015

Assessment of scrotal termography and semen quality in buffalo bulls (Bubalus bubalis) raised under humid tropical environment

D. V. Barros; L. K. X. Silva; P. R. Kahwage; A. O. A. Silva; André Guimarães Maciel e Silva; I. M. Franco; Lucieta Guerreiro Martorano; J. B. Lourenço Junior; N. Romanello; Alexandre Rossetto Garcia


Animal reproduction | 2014

Evaluation of thermal comfort, physiological and seminal parameters of buffaloes kept in artificial insemination center under tropical climate

D. V. Barros; Alexandre Rossetto Garcia; André Guimarães Maciel e Silva; A. O. A. Silva; J. S. Sousa; L. K. X. Silva; P. R. Kahwage; Patrícia Tholon; Lucieta Guerreiro Martorano; L. M. Franco


Proceedings of the 1st Buffalo Symposium of Americas, Belém, Pará, Brazil, 1-4 September 2002. | 2002

Embryo recovery rate in buffalo stimulated using a low concentration of hormone.

A. J. O. Sousa; M. S. Miranda; A. N. Reis; A. O. A. Silva; J. S. Sousa; O. M. Ohashi; W. G. Vale; J. de B. Lourenço Júnior


Proceedings of the 1st Buffalo Symposium of Americas, Belém, Pará, Brazil, 1-4 September 2002. | 2002

Pregnancy rates in suckled female buffaloes submitted to estrous and ovulation synchronization with artificial insemination in fixed time.

A. S. A. Camelo; H. F. L. Ribeiro; A. O. A. Silva; J. S. Souza; W. G. Vale; J. de B. Lourenço Júnior; O. M. Ohashi

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O. M. Ohashi

Federal University of Pará

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W. G. Vale

Federal University of Pará

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Alexandre Rossetto Garcia

Empresa Brasileira de Pesquisa Agropecuária

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J. S. Sousa

Federal University of Pará

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Lucieta Guerreiro Martorano

Empresa Brasileira de Pesquisa Agropecuária

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D. V. Barros

Federal University of Pará

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H. F. L. Ribeiro

Federal University of Pará

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Hugo Didonet Láu

Empresa Brasileira de Pesquisa Agropecuária

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