Sexual maturity and fertility-related measures in young Nellore bulls receiving long-term dietary supplementation with rumen-protected polyunsaturated fatty acids.

Autor: Rossi GF; São Paulo State University (UNESP), School of Agrarian and Veterinary Sciences, Graduate Program in Veterinary Medicine, Campus Jaboticabal, São Paulo, Brazil. Electronic address: guilhermemedvet@yahoo.com.br., Ribeiro Dias EA; Institute of Animal Science (IZ), São Paulo Agribusiness Technology Agency (APTA), Sertãozinho, São Paulo, Brazil., Bastos NM; São Paulo State University (UNESP), School of Agrarian and Veterinary Sciences, Graduate Program in Veterinary Medicine, Campus Jaboticabal, São Paulo, Brazil., Vrisman DP; São Paulo State University (UNESP), School of Agrarian and Veterinary Sciences, Graduate Program in Veterinary Medicine, Campus Jaboticabal, São Paulo, Brazil., Rodrigues NN; São Paulo State University (UNESP), School of Agrarian and Veterinary Sciences, Graduate Program in Veterinary Medicine, Campus Jaboticabal, São Paulo, Brazil., Vantini R; São Paulo State University (UNESP), School of Agrarian and Veterinary Sciences, Graduate Program in Veterinary Medicine, Campus Jaboticabal, São Paulo, Brazil., Garcia JM; São Paulo State University (UNESP), School of Agrarian and Veterinary Sciences, Graduate Program in Veterinary Medicine, Campus Jaboticabal, São Paulo, Brazil., Simili FF; Institute of Animal Science (IZ), São Paulo Agribusiness Technology Agency (APTA), Sertãozinho, São Paulo, Brazil., Ribeiro EG; Institute of Animal Science (IZ), São Paulo Agribusiness Technology Agency (APTA), Sertãozinho, São Paulo, Brazil., Canesin RC; Institute of Animal Science (IZ), São Paulo Agribusiness Technology Agency (APTA), Sertãozinho, São Paulo, Brazil., Zerlotti Mercadante ME; Institute of Animal Science (IZ), São Paulo Agribusiness Technology Agency (APTA), Sertãozinho, São Paulo, Brazil., Freitas-Dell'Aqua CP; São Paulo State University (UNESP), School of Veterinary Medicine and Animal Science, Department of Animal Reproduction and Veterinary Radiology, Campus Botucatu, São Paulo, Brazil., Monteiro FM; São Paulo State University (UNESP), School of Agrarian and Veterinary Sciences, Graduate Program in Veterinary Medicine, Campus Jaboticabal, São Paulo, Brazil; Institute of Animal Science (IZ), São Paulo Agribusiness Technology Agency (APTA), Sertãozinho, São Paulo, Brazil., Mingoti GZ; São Paulo State University (UNESP), School of Agrarian and Veterinary Sciences, Graduate Program in Veterinary Medicine, Campus Jaboticabal, São Paulo, Brazil; São Paulo State University (UNESP), School of Veterinary Medicine, Laboratory of Reproductive Physiology, Campus Araçatuba, São Paulo, Brazil. Electronic address: gisele.mingoti@unesp.br.
Jazyk: angličtina
Zdroj: Theriogenology [Theriogenology] 2019 Nov; Vol. 139, pp. 16-27. Date of Electronic Publication: 2019 Jul 19.
DOI: 10.1016/j.theriogenology.2019.07.021
Abstrakt: The objective of this study was to evaluate the effects of long-term supplementation with rumen-protected fatty acids (FA) on growth and reproductive parameters of young Nellore bulls in a grazing regime. Forty-eight young bulls were distributed into two groups: FA (supplemented with rumen-protected polyunsaturated FA); and control (control fat-free supplement). The animals were supplemented from 14.3 to 24.6 months of age and growth and reproductive parameters were evaluated at 28-day intervals. The semen was cryopreserved in the last collection and fresh and post-thaw semen samples were evaluated. Feeding FA did not affect (P > 0.05) growth, reproductive parameters (scrotal circumference, sperm concentration per mL of ejaculate, percentage of sperm defects, sperm quality and fertility in vitro), or testicular ultrasonographic characteristics. However, thawed semen from bulls fed FA exhibited better quality (P < 0.05) than control semen for the following parameters evaluated by computer-assisted sperm analysis: average path velocity [μm/s: 90.48 vs. 79.66 post-thaw and 74.81 vs. 72.80 post-rapid thermoresistance test (TRT)], straight-line velocity (μm/s: 72.37 vs. 65.20 post-thaw and 64.96 vs. 63.25 post-TRT), and curvilinear velocity (μm/s: 148.44 vs. 131.31 post-thaw and 115.68 vs. 113.35 post-TRT). In addition, feeding FA increased peripheral concentrations of testosterone, leptin, total cholesterol and high-density lipoprotein. In conclusion, the increase in testosterone concentrations in bulls fed FA was not related to variations in growth parameters and sexual maturity. In addition, post-thawing sperm velocities were enhanced by diet, however, such increases were not related to better in vitro embryo production rates.
(Copyright © 2019 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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