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The use of holding time associated with boar semen cryopreservation protocols

Grant number: 15/17620-7
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): July 01, 2016
Effective date (End): April 30, 2017
Field of knowledge:Agronomical Sciences - Veterinary Medicine - Animal Reproduction
Principal Investigator:André Furugen Cesar de Andrade
Grantee:Matheus Saliba Monteiro
Host Institution: Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade de São Paulo (USP). São Paulo , SP, Brazil


This project aims to verify if short periods of holding time (period of time that the sperm remains in contact with seminal plasma at 17ºC before being subjected to cryopreservation at -196 ° C), can replace long periods (24 hours). To perform this experiment, six ejaculates will be collected from 6 boars (n=36). After semen analyses, it will be extended in BTS and allocated into treatments: T0 (centrifuged after extended), T4 (4 hours contact with seminal plasma at 17 ° C), T8 (8 hours contact with seminal plasma at 17 ° C), T12 (12 hours contact with seminal plasma at 17 ° C) and T24 (8 hours contact with seminal plasma at 17 ° C). After the holding time, the samples will centrifuged (500 x g / 10 min) and the pellets will suspended in a freezer extender of boar semen to a final concentration of 300 x 106 spermatozoa/mL, subsequently packaged into 0.5 ml straws and cryopreserved by an automatic system. After thawing, samples will be evaluated by motility characteristics (CASA), plasma and acrosomal membrane integrity, mitochondrial membrane potential and fluidity of plasma membrane lipids by flow cytometer. Data will be submitted to analysis of mixed models (PROC MIXED), using the SAS (2002).

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TORRES, MARIANA A.; MONTEIRO, MATHEUS S.; PASSARELLI, MARINA S.; PAPA, FREDERICO O.; DELL'AQUA, JR., JOSE ANTONIO; ALVARENGA, MARCO ANTONIO; MARTINS, SIMONE M. M. K.; DE ANDRADE, ANDRE F. C.. The ideal holding time for boar semen is 24 h at 17 degrees C prior to short-cryopreservation protocols. CRYOBIOLOGY, v. 86, p. 58-64, . (15/17620-7, 16/24690-4, 16/09441-8)

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