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Evaluation of seminal characteristics in Nellore bulls selected for residual feed intake and supplemented with polyunsaturated fatty acids in pasture conditions

Grant number: 15/06733-5
Support type:Regular Research Grants
Duration: February 01, 2016 - January 31, 2018
Field of knowledge:Agronomical Sciences - Veterinary Medicine - Animal Reproduction
Principal Investigator:Gisele Zoccal Mingoti
Grantee:Gisele Zoccal Mingoti
Home Institution: Faculdade de Medicina Veterinária (FMVA). Universidade Estadual Paulista (UNESP). Campus de Araçatuba. Araçatuba , SP, Brazil
Assoc. researchers: Enilson Geraldo Ribeiro ; Fabio Morato Monteiro ; Flávia Fernanda Simili ; Maria Eugênia Zerlotti Mercadante


Feed efficiency is very important for breeding programs. The residual feed intake (RFI) is an indicator that has a correction of dietary intake for animal weight and weight gain. In addition, puberty is important for the improvement of breeding cattle. The production and semen quality are influenced by several factors, especially nutrition. Polyunsaturated fatty acids (PUFA) have effects on the reproductive performance of males, but few studies have been conducted to assess the impact of genetic selection for feed efficiency in reproducing the Zebu. Addressed within the context, the aim of this work is to evaluate the effects of supplementation with PUFA on pasture at puberty and in the seminal characteristics of Nelore bulls selected for RFI. It will be selected 56 young bulls of 12 months of traditional herd from the Animal Science Institute of Sertãozinho, SP. The experimental design will be completely randomized in a factorial 2 x 2 (RFI x supplementation), being high RFI with or without supplementation with PUFA, and low RFI with or without supplementation with PUFA. The experimental diets will be isoproteic and isoenergetic. The animals will be kept in Brachiaria brizantha cv. Marandu pasture in continuous stocking during the experimental period. The measurement of scrotal circumference, testicular ultrasound and semen collection to verify the seminal characteristics will be taken every each 28 days and sperm cryopreservation will be held in the last three collections. After thawing, it will be performed new tests of sperm quality. In addition, we will analyze the weight, body condition score (BCS), hormonal and plasmatic metabolics every each 28 days. The evaluation of the ultrasound carcass and individual food consumption of pasture and ration will be taken every three months in the summer, fall, winter and spring, using indicators like chromium oxide, titanium dioxide and NDFi. (AU)

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)
ROSSI, GUILHERME FAZAN; RIBEIRO DIAS, ERIKA ALINE; BASTOS, NATALIA MARINS; VRISMAN, DAYANE PRISCILA; RODRIGUES, NAIARA NANTES; VANTINI, ROBERTA; GARCIA, JOAQUIM MANSANO; SIMILI, FLAVIA FERNANDA; RIBEIRO, ENILSON GERALDO; CANESIN, ROBERTA CARRILHO; ZERLOTTI MERCADANTE, MARIA EUGENIA; FREITAS-DELL'AQUA, CAMILA P.; MONTEIRO, FABIO MORATO; MINGOTI, GISELE ZOCCAL. Sexual maturity and fertility-related measures in young Nellore bulls receiving long-term dietary supplementation with rumen-protected polyunsaturated fatty acids. Theriogenology, v. 139, p. 16-27, NOV 2019. Web of Science Citations: 0.
DALL'ACQUA, PRISCILA CHEDIEK; NUNES, GIOVANA BARROS; DA SILVA, CINTIA RODRIGUES; FONTES, PATRICIA KUBO; GOUVEIA NOGUEIRA, MARCELO FABIO; LOPES, FLAVIA LOMBARDI; MARINHO, MARCIA; MINGOTI, GISELE ZOCCAL. Differences in embryonic gene expression and quality indicate the benefit of epidermal growth factor receptor inhibitor during prematuration to improve competence in bovine oocytes. REPRODUCTION IN DOMESTIC ANIMALS, v. 54, n. 4, p. 666-677, APR 2019. Web of Science Citations: 1.
AMBROGI, M.; DALL'ACQUA, P. C.; ROCHA-FRIGONI, N. A. S.; LEAO, B. C. S.; MINGOTI, G. Z. Transporting bovine oocytes in a medium supplemented with different macromolecules and antioxidants: Effects on nuclear and cytoplasmic maturation and embryonic development in vitro. REPRODUCTION IN DOMESTIC ANIMALS, v. 52, n. 3, p. 409-421, JUN 2017. Web of Science Citations: 4.

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