Acta Scientiae Veterinariae 年发文量-刊鹿论文编译

Testicular Morphological and Ultrasonographic Characterization of Male Gray Brocket Deers (Mazama gouazoubira) in Different Reproductive Status

Abstract:

Background : Gray brocket deer ( Mazama gouazoubira ) populations have been declining due to human intervention. Yet, only a few studies have assessed ultrasonographic testicular characteristics in cervids. Considering the relevance of monitoring testicular size, blood flow, and parenchyma, the present study aims to establish baseline information on scrotal circumference, testicular volume, and spectral Doppler parameters, to describe differences among adult male gray brocket deer in different reproductive status, and to correlate ultrasound parameters with testes size measurements. Materials, Methods & Results : Six adult male gray brocket deers were used in the study. Scrotal circumference and testicular volume were measured. B mode ultrasound images of testes (longitudinal and cross-sectional views) and epididymes were subjected to computer-assisted analysis, obtaining the numerical pixel values (NPV) and pixel standard deviation (PSD). Using spectral Doppler, supratesticular artery blood flow velocities (peak systolic velocity - PSV, end diastolic velocity - EDV, time-average maximum velocity - TAMAX, resistivity - RI and pulsatility indices - PI) were obtained. Semen was analyzed through total motility, vigor, and concentration tests. Three animals were normospermic (F+ group) and three were oligo/azoospermic (F- group). Groups were compared using were compared using a one-way ANOVA or Kruskal-Wallis followed by Student-Newman-Keuls (SNK) test. Ultrasound parameters were correlated to testes size parameters using Pearson’s correlation for parametric variables and Spearman’s correlation for non-parametric variables. F+ group presented significantly higher scrotal circumference (14.57 ± 1.19 cm), testicular volume (26.18 ± 4.94 cm 3 ), and testes cross-sectional NPV (69.88 ± 24.00) and PSD (10.78 ± 3.42) than group F- (NPV: 28.26 ± 13.75, PSD: 6.70 ± 1.84). No significant differences were observed between the groups regarding the spectral Doppler ultrasound parameters. Significant correlations were observed between scrotal circumference and longitudinal (r = 0.76) and cross-sectional testes NPV (r = 0.89), and testicular volume was correlated with longitudinal (r = 0.78) and cross-sectional testes NPV (r = 0.91) and with cross-sectional testes PSD (ρ = 0.82). Discussion : Increased testicular echogenicity (higher NPV) has been positively associated with improved testicular growth, cell population expansion, inner and outer seminiferous tubules diameter, spermatids percentages and testis weight. In addition, more heterogenous testes (higher PSD) were associated with higher sperm output. It was suggested that the animals in group F- had compromised testicular development and spermatogenesis. The correlation observed between testes NPV and scrotal circumference was proposed to be associated with seminiferous tubules impairment. The F- group showed lower testicular volume, NPVs and PSDs in cross-sectional testicular images, suggesting higher protein levels and lower lipid contents were present in their parenchyma, influencing in testicular echogenicity and echotexture. No differences in spectral Doppler parameters were observed between the two groups. Also observed in stallions. However, PSV, EDV, TAMAX could be potential infertility indicators in other mammalians. These different results may be due to different locations of the evaluated vessel, species and techniques, age, ambient temperature, pathological conditions, and anaesthesia. Thus, it is suggested that scrotal circumference, testicular volume, and testes NPV are good indicators of male reproductive health in gray brocket deer and may help with better male selection in the species.

Author Listing： Duanny Murinelly de Souza Cunha;Mírley Barbosa de Souza;Bruna Farias Brito;Vítor Lima Torres;Thalles Gothardo Pereira Nunes;Samuel Salgado Tavares;Daniel de Araujo Viana;Lúcia Daniel Machado da Silva;Leda Maria Costa Pereira;Dárcio Ítalo Alves Teixeira

Volume： 47

Pages： None

DOI： 10.22456/1679-9216.98311

Language： English

Journal： Acta Scientiae Veterinariae

Acta Scientiae Veterinariae

ACTA SCI VET

影响因子：0.2

是否综述期刊：否

是否OA：否

是否预警：不在预警名单内

发行时间：2002

ISSN：1678-0345

发刊频率：Tri-annual

收录数据库：SCIE/Scopus收录

出版国家/地区：BRAZIL

出版社：Universidade Federal do Rio Grande do Sul

期刊介绍

ASV is concerned with papers dealing with all aspects of disease prevention, clinical and internal medicine, pathology, surgery, epidemiology, immunology, diagnostic and therapeutic procedures, in addition to fundamental research in physiology, biochemistry, immunochemistry, genetics, cell and molecular biology applied to the veterinary field and as an interface with public health.The submission of a manuscript implies that the same work has not been published and is not under consideration for publication elsewhere. The manuscripts should be first submitted online to the Editor. There are no page charges, only a submission fee.

ASV 关注的论文涉及疾病预防、临床和内科、病理学、外科、流行病学、免疫学、诊断和治疗程序的各个方面，细胞和分子生物学应用于兽医领域并作为公共卫生的接口。提交手稿意味着同一作品尚未出版，也未考虑在其他地方出版。稿件应首先在线提交给编辑。没有页面费用，只有提交费。

年发文量	121
国人发稿量	1
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版面费	-
偏重研究方向	VETERINARY SCIENCES-
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