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Correction to: Relationship between the seasonal changes in plasma testosterone and thyroxine concentrations with sperm cryoresistance in Gabon bucks
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Departamento de Reproducción AnimalIn the original version of this article, the given and family names of all authors were incorrectly structured. The names Viera María Noel, Ungerfeld Rodolfo, Velázquez Rosario, and Santiago-Moreno Julián should be presented as María Noel Viera, Rodolfo Ungerfeld, Rosario Velázquez, Julián Santiago-Moreno. These are now correctly presented above. The original article has been corrected..Peer reviewe
Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus)
No full textRossini, Carmen, Ungerfeld, Rodolfo (2015): Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus). Journal of Mammalogy 97 (1): 1-12, DOI: 10.1093/jmammal/gyv167, URL: http://dx.doi.org/10.1093/jmammal/gyv16
Fig. 2 in Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus)
No full textFig. 2.—Typical gas chromatography–mass spectrometry traces of gland secretions from a yearling pampas deer. Samples were collected during the breeding season (March in the Southern Hemisphere). The traces show the absence of lateral differences between secretions from digital, tarsal, and preorbital glands: upper traces are left secretions and lower are right.Published as part of Rossini, Carmen & Ungerfeld, Rodolfo, 2015, Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus), pp. 1-12 in Journal of Mammalogy 97 (1) on page 9, DOI: 10.1093/jmammal/gyv167, http://zenodo.org/record/783262
Fig. 4 in Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus)
No full textFig. 4.—Compound classes that exhibited significant differences related to sample origin. Different letters on columns indicate significant differences (P <0.05, MANOVA). Data were obtained from samples from the preorbital, tarsal, and digital glands, and back hairs of 6 adult and 5 yearling male pampas deer that were collected during the breeding season (March in the Southern Hemisphere).Published as part of Rossini, Carmen & Ungerfeld, Rodolfo, 2015, Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus), pp. 1-12 in Journal of Mammalogy 97 (1) on page 10, DOI: 10.1093/jmammal/gyv167, http://zenodo.org/record/783262
Fig. 3.—Dendrogram obtained after a in Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus)
No full textFig. 3.—Dendrogram obtained after a hierarchical cluster analysis on the 143 compounds found. Data were obtained from gas chromatographic–mass spectrometry analyses of samples from the preorbital, tarsal, and digital glands, and back hairs of 6 adult and 5 yearling male pampas deer that were collected during the breeding season (March in the Southern Hemisphere). Animals are consecutively numerated as yearling (Y) from 1 to 5 (Y1–Y5) and adults (A) from 6 to 11 (A6– A11). Agglomerative coefficient equals 0.15.Published as part of Rossini, Carmen & Ungerfeld, Rodolfo, 2015, Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus), pp. 1-12 in Journal of Mammalogy 97 (1) on page 9, DOI: 10.1093/jmammal/gyv167, http://zenodo.org/record/783262
Fig. 1 in Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus)
No full textFig. 1.—Detailed gas chromatography–mass spectrometry traces of the 4 kinds of samples analyzed. Samples were collected during the breeding season (March in the Southern Hemisphere). Total ion chromatograms obtained from samples (preorbital, tarsal, and digital glands, and back hairs) from the same adult individual are shown. Magnified regions show the time range where a) short-chained compounds, b) esters, and c) fatty alcohols and sterols concentrate. Peak numbers show the most abundant or ubiquitous compounds and are as in Table 1 (XIII is a sulphurcontaining compound, LXI–LXII and CVI are fatty alcohols, C is an hydrocarbon, CII is squalene, CIX is a sterol, and CXX is cholesterol).Published as part of Rossini, Carmen & Ungerfeld, Rodolfo, 2015, Chemical profile of the cutaneous gland secretions from male pampas deer (Ozotoceros bezoarticus), pp. 1-12 in Journal of Mammalogy 97 (1) on page 4, DOI: 10.1093/jmammal/gyv167, http://zenodo.org/record/783262
Comparison of the Conventional and Ultra-Rapid Freezing Techniques in Gabon Bucks Throughout the Year
No full textThe aim of this work was to compare the effectiveness of ultra-rapid freezing (UF) and conventional slow freezing (CF) to cryopreserve buck sperm throughout the year. During 1 year, semen from 10 adult Gabon bucks was collected by electroejaculation every 2 weeks. Before and after freezing, samples were selected by density gradient centrifugation, and after sperm selection, the sample was divided into two aliquots. One aliquot was CF with an extender based on Tris, citric acid, and glucose (TCG) +6% yolk +5% glycerol, and maintained at 5°C for 3 hours of equilibration before freezing. The other aliquot was frozen using an UF method with an extender based on TCG +6% yolk +100 mM sucrose, and maintained at 5°C for 30 minutes. The evaluations included the percentages of motile sperm, sperm with progressive motility, quality of sperm motility, and the percentages of sperm with functional membrane, live sperm, sperm with morphoabnormalities, and sperm with intact acrosome. The percentage of sperm with intact acrosome was higher using the conventional freezing method (p < 0.05). After thawing and at pre- and postselection stages, the quality of motility, and the percentages of motile sperm, progressive motile sperm, sperm with functional membrane, and with intact acrosome were greater using CF than UF (p < 0.005). Conventional freezing was more effective than UF to cryopreserve sperm from Gabon bucks, at least in our experimental conditions. Most differences in favor of CF were observed in the quality of motility, and the percentages of motile sperm, progressive motile sperm, sperm with functional membrane, and with intact acrosome during long periods of the year, or even remained throughout it.Peer reviewe
Equine Chorionic Gonadotropin (eCG) improves bucks’ semen quality during the nonbreeding season
No full textIn most goat breeds, testosterone serum concentration and semen quality decrease during the nonbreeding season. However, bucks reproductive activity may be stimulated with the administration of equine chorionic gonadotropin (eCG). Therefore, the aim of this study was to determine whether the repeated administration of eCG stimulates the reproductive status of bucks during the nonbreeding season. The study was performed with 19 bucks that were assigned to a group that was treated with eCG (GeCG) and an untreated control group (GCon). The GeCG bucks received an initial dose of 800 IU of eCG (Day 0), followed by four doses of 500 IU administered every 5 days beginning on Day 5. Serum testosterone and anti-eCG antibody concentrations, testicular and seminal traits were determined until Day 60. Testosterone concentration (from Day 3 to 21: p < 0.0001), anti-eCG titre (from Day 12 to 44: p ≤ 0.01), percentage of motile spermatozoa (Day 6: p = 0.006 and 14: p = 0.001) and of spermatozoa with progressive motility (Day 6: p = 0.01 and 14: p = 0.002) and the percentage of spermatozoa with functional membrane (Day 6: p = 0.02 and 22: p = 0.008) were higher in GeCG than in GCon bucks. Also in frozen-thawed samples, the percentage of motile spermatozoa tended to be higher in GeCG than that of GCon bucks (p = 0.07). In conclusion, the administration of eCG during the nonbreeding season stimulated the secretion of testosterone and improved fresh and possibly frozen-thawed semen quality. However, it also resulted in an increase in anti-eCG antibody titre
Daily administration of a GnRH analogue enhances sperm quality in bucks during the non-breeding season
No full textThe aim of this study was to determine if daily administration of a GnRH analogue (buserelin acetate) to bucks during the non-breeding season increases testosterone concentration and improves sperm quality. Five bucks received a daily dose of buserelin for 10 days, starting on Day 0 (first administration), and another five bucks remained as controls. Testosterone concentrations were greater in treated than in control bucks during the first hours after buserelin administration (P = 0.05), but greater in controls 10 h later (P < 0.01). Sperm mass motility and percentage of motile sperm were greater in treated (3.9 ± 0.6 and 70.1 ± 7.9%, respectively) than in control bucks (1.0 ± 0.6, P < 0.01; 45.0 ± 7.9%, P < 0.05 respectively) on Day 4. Percentage of sperm with normal morphology tended to be greater in treated than in control bucks (81.8 ± 6.2% compared with 63.5 ± 6.4% respectively, P = 0.08). The treatment decreased the percentage of sperm with mid piece defect and with bent tail (7.0 ± 1.5% compared with 12.0 ± 1.5%; 8.0 ± 1.7% compared with 13.5 ± 1.7%, treated and control bucks, respectively, P = 0.05 for both). The square root percentage of sperm with loose but heads with normal structures tended to be less in treated than control bucks (1.3 ± 0.3% compared with 0.4 ± 0.3% respectively, P = 0.06). It was concluded that daily administration of buserelin during the non-breeding season led to a rapid increase in testosterone concentration and improved sperm quality
Influence of seasonality and stimulus of oestrous does in bucks’ aggressiveness
No full textAggressiveness is directly related to testosterone concentration, which varies with seasons and in response to female stimulation. The aim was to determine if the frequency and pattern of agonistic interactions between bucks varies seasonally and in response to oestrous female stimulation. In the first study we characterized the pattern of agonistic interactions during feeding throughout a whole year in groups of Iberian ibex bucks; and in the second study, we determined the influence of oestrous does on the frequencies of agonistic behaviours between Gabon bucks in different seasons. In Iberian ibex bucks, the frequency of agonistic behaviours was maximum in summer and testosterone concentration in late autumn. In Gabon bucks, total agonistic interactions increased in bucks stimulated by females in late summer and autumn. In late autumn there were more interactions without physical contact in stimulated than in isolated bucks. Aggressiveness in bucks varied along the year, but the seasonal pattern was related to the context in which behaviours were recorded. Stimulation with oestrous females induced an increase of aggressiveness during the breeding season. At least in the conditions of these studies, testosterone concentrations seemed not to be the main influence on the frequency in which aggressive behaviour was displayed. © 2016 Elsevier B.V
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