Relationship of residual feed intake with semen parameters and testicular ultrasound of Nellore bulls

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dc.contributor.authorBorges, Marcelo Sant’Ana
dc.contributor.authorSilva, Marina de Oliveira
dc.contributor.authorFernandes, Luana Gomes
dc.contributor.authorRodrigues, Naiara Nantes
dc.contributor.authorRossi, Guilherme Fazan
dc.contributor.authorFreitas-Dell’Aqua, Camila de Paula
dc.contributor.authorBonilha, Sarah Figueiredo Martins
dc.contributor.authorMercadante, Maria Eugênia Zerlotti
dc.contributor.authorMonteiro, Fabio Morato
dc.date.accessioned2024-05-17T11:52:57Z
dc.date.available2024-05-17T11:52:57Z
dc.date.issued2023
dc.description.abstractABSTRACT The objective of this study was to evaluate characteristics of the testicular parenchyma and vascular parameters of the pampiniform plexus obtained by ultrasound, semen quality parameters, and sperm freezability in Nellore bulls classified based on residual feed intake (RFI). Twenty-seven bulls (21.82±0.88 months of age) evaluated for feed efficiency were sampled for the study, including 15 with low RFI (−0.592±0.09 kg dry matter/day) and 12 with high RFI (0.792±0.10 kg dry matter/day). In ultrasound and Doppler assessment, the most efficient animals (low RFI) showed higher pulsatility and resistive indexes, as well as a tendency towards greater heterogeneity of the testicular parenchyma (0.625±0.032 vs. 0.508±0.032, 1.012±0.072 vs. 0.802±0.072, and 12.9±0.96 vs. 10.2±0.96, respectively, for low vs. high RFI). However, these animals tended to have lower peak diastolic velocity (5.19±0.50 for low RFI vs. 6.54±0.50 for high RFI). Analysis of fresh semen showed a lower percentage of minor defects in low RFI animals (2.67±1.19%) compared with high RFI animals (8.10±1.19%), without differences in the other parameters in fresh or thawed semen and after thermoresistance testing. Evaluation of flow cytometry parameters showed a higher quality of mitochondrial respiration in semen samples of low RFI animals (22.04±2.50%) compared with high RFI animals (12.29±2.71%). Therefore, although RFI exerts an effect on the Doppler parameters of the pampiniform plexus, it is not sufficient to affect the quality of fresh or thawed semen.
dc.identifier.doi10.37496/rbz5220220041
dc.identifier.issn1516-3598
dc.identifier.otherS1516-35982023000100700-scl
dc.identifier.urihttps://repositorio-aptaregional.agricultura.sp.gov.br/handle/123456789/1872
dc.relation.ispartofRevista Brasileira de Zootecnia
dc.subjectfeed efficiency
dc.subjectIndian cattle
dc.subjectsperm kinetics
dc.subjecttesticular parenchyma
dc.titleRelationship of residual feed intake with semen parameters and testicular ultrasound of Nellore bulls
dc.typeArtigos
oaire.citation.volume52

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