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| Author(s): |
Graciana Corrêa Romitto
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) |
| Defense date: | 2003-12-17 |
| Examining board members: |
Valquiria Hyppolito Barnabe;
Cesar Roberto Esper;
Marcelo Roncoletta
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| Advisor: | Valquiria Hyppolito Barnabe |
| Abstract | |
Seminal plasma proteins profiles from Nelore (Bos taurus primigerus indicus) and Simmental (Bos taurus primigerus taurus) bulls, used for multiple-sire breeding under range conditions, at Dourados/MS region, were studied aiming to analyze the relation between these proteins and traits linked to bulls reproductive performance. Semen samples were collected in the winter (July/2001) and summer (February/2002). Initially, an andrological examination was performed, followed by standard semen analysis. Seminal plasma was subjected to total protein quantification, thiobarbituric acid reactive substances quantification (TBARS, to evaluate lipid peroxidation), and two-dimensional protein electrophoresis. To analyze seminal plasma protein profile of each breed, the following parameters were used: comparison between winter and summer, comparison among groups of samples divided by quantification of traits linked to reproductive performance (sperm morphology, total protein quantification, TBARS quantification) and comparison among groups of samples divided by breeding soundness evaluations (BSEs), previously reported in literature. Simmental bulls showed lower adaptability to tropical environment conditions, with higher values of major sperm defects, total protein and TBARS in the summer. A great variability was observed in the protein profile between Nelore and Simmental breeds, and, for each breed it was found great individual variability too. Nelore seminal plasma protein profile presented 155 spots, 04 of which were considered potential markers for traits linked to reproductive performance. For Simmental breed, 248 spots were identified, with special interest for 04 spots, which showed higher potential as markers to reproductive characteristics. Results show that seminal plasma protein profile is related to bulls reproductive performance. Further studies about those proteins which are potential markers are needed, to determine their function at bulls reproductive system and in the events related to fertilization. (AU) | |