Buck Semen Research Articles

Effect of diluters on frozen semen production of Black Bengal Goat

The present study was undertaken to investigate the efficacy of three diluters (Triladyl, Andromed and Tris) for the production of frozen semen in Black Bengal goat and their effect on conception rate. Over the course of 6 months, data from six bucks were collected. Each collected sample was diluted with Triladyl, Andromed and Tris diluter, filled into 0.50 ml straws, sealed and equilibrated at 5℃ for freezing. The motility, viability and morphology were evaluated after dilution and in every step of cryopreservation (after equilibration, after freezing and after thawing). It became clear that motility and sperm viability of the frozen thawed semen differed significantly (p<0.05) but differed insignificantly (p>0.05) immediate after dilution among the diluters. The motility of frozen thawed semen was 42.50%±1.71, 34.67%±1.67 and 28.71%±1.55 in Triladyl, Andromed and Tris diluter, respectively. The viability of frozen thawed semen was 40.51%±1.78, 32.24%±1.52 and 26.84%±1.56 in Triladyl, Andromed and Tris diluter, respectively. In case of morphology, it differed insignificantly (p>0.05) among the diluters in every step of cryopreservation. Higher percentage of normal spermatozoa was found in Triladyl based diluter (87.11%) in frozen thawed semen. After 15 days of sample preparation, the motility of prepared sample was again checked to ensure the quality of frozen semen in liquid nitrogen (LN). It differed insignificantly (p>0.05) with frozen thawed semen after 24 hours of production. The obtained conception rate was 38% for Triladyl, 35% for Andromed and 27% for Tris diluter. The results of the study revealed that cryopreservation of buck semen revealed good results with Triladyl diluter followed by Andromed and Tris diluter. Bangladesh Journal of Animal Science 52 (4): 105-113

Effect of diluters on frozen semen production of Black Bengal Goat

The present study was undertaken to investigate the efficacy of three diluters (Triladyl, Andromed and Tris) for the production of frozen semen in Black Bengal goat and their effect on conception rate. Over the course of 6 months, data from six bucks were collected. Each collected sample was diluted with Triladyl, Andromed and Tris diluter, filled into 0.50 ml straws, sealed and equilibrated at 5℃ for freezing. The motility, viability and morphology were evaluated after dilution and in every step of cryopreservation (after equilibration, after freezing and after thawing). It became clear that motility and sperm viability of the frozen thawed semen differed significantly (p<0.05) but differed insignificantly (p>0.05) immediate after dilution among the diluters. The motility of frozen thawed semen was 42.50%±1.71, 34.67%±1.67 and 28.71%±1.55 in Triladyl, Andromed and Tris diluter, respectively. The viability of frozen thawed semen was 40.51%±1.78, 32.24%±1.52 and 26.84%±1.56 in Triladyl, Andromed and Tris diluter, respectively. In case of morphology, it differed insignificantly (p>0.05) among the diluters in every step of cryopreservation. Higher percentage of normal spermatozoa was found in Triladyl based diluter (87.11%) in frozen thawed semen. After 15 days of sample preparation, the motility of prepared sample was again checked to ensure the quality of frozen semen in liquid nitrogen (LN). It differed insignificantly (p>0.05) with frozen thawed semen after 24 hours of production. The obtained conception rate was 38% for Triladyl, 35% for Andromed and 27% for Tris diluter. The results of the study revealed that cryopreservation of buck semen revealed good results with Triladyl diluter followed by Andromed and Tris diluter. Bangladesh Journal of Animal Science 52 (4): 105-113

Studies on Fresh and Cryopreserved Seminal Attributes in Beetal Bucks Outside their Breeding Tract

The objectives of the present research were to assess fresh and cryopreserved. seminal characteristics of breeding Beetal buck semen outside of its breeding tract. Semen was collected twice in a week from twelve Beetal bucks for 6 weeks. The mean value of ejaculate volume(ml), mass motility(o-5 scale), progressive motility(%), sperm viability (%), intact acrosome(%), sperm abnormality(%) and plasma membrane integrity(%) were ranged from 0.73 ± 0.08 ml to 1.17 ± 0.27 ml; 4.17+ to 4.67+, 80.83 ± 1.54 to 87.50 ± 2.14; 83.83 ± 0.95 to 90.33 ± 0.80; 87.00 ± 0.86 to 94.67 ± 0.33; 6.83 ± 0.31 to 10.33 ± 0.67 and 59.33 ± 1.52 to 66.67 ± 1.17, respectively. The mean value of post thaw sperm motility, post thaw sperm viability, post thaw acrosome integrity, post thaw sperm abnormalities and post thaw plasma membrane integrity were ranged from 52.50± 1.12 to 66.67 ± 1.67; 60.00 ± 1.24 to 69.67 ± 1.05; 66.00 ± 0.77 to 78.83 ± 2.15; 9.00 ± 0.45 to 12.83 ± 0.60 and 41.50 ± 1.18 to 53.50 ± 1.23, respectively. It was determined that, even outside of the breeding tract, the foundational characteristics of Beetal bucks are within the range defined for other Indian breeds of goat.

Effect of the addition of platelet-rich plasma to Boer buck semen on sperm quality and antioxidant activity before and after cryopreservation and in vivo fertility

The current study aimed to investigate the effects of incorporating platelet-rich plasma (PRP) into Boer buck semen at different stages of cryopreservation (dilution, equilibration, and post-thawing) on sperm quality, functionality, antioxidant activity, and in vivo fertility. One hundred sixty ejaculates were collected from eight Boer goat bucks over ten weeks during the breeding season. The semen samples were collected using an artificial vagina, evaluated, and pooled. The pooled semen was divided into four aliquots, then diluted with a Tris-based extender supplemented with varying proportions of PRP (0%, 5%, 10%, and 15%). Subsequently, the samples were equilibrated and cryopreserved. The results showed that semen supplemented with 10% PRP has significantly higher total motility (P < 0.05) compared to the control and other groups during (dilution and equilibration) and after (post-thawing) cryopreservation. Furthermore, semen supplemented with 5% and 10% PRP significantly improved (P < 0.05) rapid sperm movement compared to the control and 15% PRP groups after equilibration and post-thawing. However, compared to the control, the supplementation of 10% PRP resulted in improved sperm progressive motility and viability during and after cryopreservation (P < 0.05), as well as increased acrosome, plasma membrane integrity, and mitochondrial membrane potential after equilibration and post-thawing of the semen (P < 0.05). Moreover, 10% PRP-supplemented semen exhibited higher levels of glutathione peroxidase (GPx) and catalase (CAT) and lower levels of malondialdehyde (MDA) after equilibration and post-thawing compared to the control and 15% PRP groups. The pregnancy and kidding rates were higher (80%; 80%) for 10% PRP-supplemented semen compared to the control (48%; 40%), respectively, and other groups. In conclusion, the addition of PRP improved the cryo-tolerance of Boer buck sperm by enhancing quality, functionality, antioxidant activity, and in vivo fertility.

Association between levels of insulin-like growth factor-1 in serum and seminal plasma with fresh and frozen-thawed semen characteristics in Beetal bucks.

The aim of this study was to investigate the relationship between the levels of insulin-like growth factor-1 (IGF-1) in serum and seminal plasma and the characteristics of semen in Beetal bucks (Capra hircus). A total of 12 adult Beetal bucks were involved in the study, with each buck providing six ejaculates collected using a standard artificial vagina (n = 72 total). Only qualified semen samples (volume of 0.7 mL, a mass motility rating of 3+ or higher on a 0-+ scale, and individual progressive motility of 80% or more) divided into three fractions were processed for estimation of IGF-1 and other seminal parameters like motility, viability, acrosome integrity, sperm abnormality and superoxide dismutase (SOD) activity. The first and second fraction were diluted and extended with Optixcell extender (1:15 ratio). The first ejaculate fraction was processed for studying fresh semen parameters and the second fraction was cryopreserved for evaluating frozen semen parameters. French mini straws (0.25 mL) were used for semen filling, and polyvinyl alcohol powder of different colours was used for sealing the extended semen. The third fraction of each ejaculate was centrifuged at room temperature (1100 × g for 7 min) to separate the seminal plasma. Additionally, blood samples were taken from each buck on the same day as semen collection, resulting in a total of 36 blood samples. The results revealed a significant positive correlation (r = .4243; p < .05) between the concentration of IGF-1 in both serum and seminal plasma of the Beetal bucks. Furthermore, the concentration of IGF-1 in serum showed significant positive correlations with sperm viability (r = .554; p < .05), acrosome integrity (r = .527; p < .05), post-thaw sperm motility (r = .407; p < .01), post-thaw sperm viability (r = .426; p < .01) and post-thaw acrosome integrity (r = .333; p < .05). However, it had a significant negative correlation with SOD activity in fresh semen (r = -0.458; p < .01). Moreover, the concentration of IGF-1 in seminal plasma demonstrated significant positive correlations with individual progressive motility (r = .341; p < .05), sperm viability (r = .527; p < .05), acrosome integrity (r = .539; p < .05), sperm plasma membrane integrity (r = .464; p < .05), post-thaw sperm motility (r = .644; p < .01), post-thaw sperm viability (r = .643; p < .01), post-thaw acrosome integrity (r = .487; p < .01) and post-thaw sperm plasma membrane integrity (r = .521; p < .01). Additionally, it showed a significant negative correlation with SOD activity in both fresh semen (r = -0.714; p < .01) and frozen semen (r = -0.558; p < .01) of Beetal bucks. Based on these findings, IGF-1 in seminal plasma can be considered as a potential biomarker for the selection of bucks for breeding purposes.

IGF-1 Stabilizes Goat Sperm Mitochondrial Transmembrane Potential and Reduces DNA Fragmentation

BACKGROUND: Antioxidant present in sperm cells protects them from oxidative damage. However, sperm are more susceptible to peroxidative damages due to the loss of these enzymes during cryopreservation and their survival and fertility may be compromised. Insulin like growth factor-1 (IGF-1) has an antioxidant effect and could maintain sperm motility. OBJECTIVE: To improve seminal parameters, mitochondrial membrane potential (MMP), oxidative status and DNA integrity of buck semen after freeze-thawing by fortification of goat semen diluent with various concentrations of IGF-1. MATERIALS AND METHODS: Fifty ejaculates were collected and were extended with tris- citric acid- fructose diluent with 10% egg yolk and 6% glycerol with sperm concentrations of 1×108 mL– 1. Post-cryopreserved sperm were assessed for motility and a range of other functional parameters. RESULTS: In post-thaw semen sperm motility, live sperm count, acrosome integrity, hypo-osmotic swelling positive spermatozoa, malondialdehyde (MDA), protein carbonyl content (PCC), TUNEL positive sperm differed significantly (P&lt;0.05) with the various concentrations of IGF-1 used. Sperm functional parameters post-thawing were significantly (P&lt;0.05) better in 250 ng/mL IGF-1. IGF-1 protects against lipid peroxidation by lowering MDA and PCC production, thus reducing the harmful effect of reactive oxygen species. The kidding percentage using the artificial insemination technique was significantly higher (i.e., 40%) in the group supplemented with 250 ng/mL of IGF-1 than in the non-supplemented group (i.e., 30%). CONCLUSION: IGF-1 may be used to improve post-thaw semen quality and fertility as measured by actual kidding rate.

Asparagus racemosus improves seminal antioxidant status and sperm characteristics in buck semen at refrigeration temperature

The present investigation was carried out to evaluate the effect of Asparagus racemosus (Shatavari) aqueous extract on buck semen quality during preservation. In the current study, 8 ejaculates from 8 Jakhrana bucks maintained at Jakhrana unit of ICAR-CIRG (semi-arid region) were collected (total 64 ejaculates) during the period from April to June, 2022. Good quality semen samples were pooled during each collection. Pooled semen samples were then divided into 4 equal parts, and diluted in TRIS buffer containing different concentration of Shatavari aqueous extract (Different groups, i.e. Gr1-5 mg, Gr2-2.5 mg, Gr3-1.25 mg, Gr4-0 mg of Shatavari aqueous extract/ml of semen diluent). All the diluted semen samples were kept at refrigerated temperature (5°C) for seven days, and on each day, diluted semen was evaluated for various sperm characteristics and antioxidant status. Gr3 showed significantly better results in terms of sperm viability, sperm motility, acrosomal integrity and plasma membrane integrity. Along with this, the longevity of sperm was also enhanced in Shatavari supplemented group.

Effects of preservation period on quality of chilled semen of Boer-cross bucks

Characteristics of fresh semen and the effect of chilling on the quality of semen of Boer-cross bucks were studied. Fresh semen from two Boer-cross bucks was evaluated for volume, mass motility, progressive motility, viability, concentration and proportion of spermatozoa with normal acrosome, mid-piece and tail. The semen was diluted at 1:4 ratios with Tris-fructose-citrate-egg yolk extender, preserved at 4ºC for 72 hours and evaluated for progressive motility and proportion of spermatozoa with normal acrosome, mid-piece and tail at 24-hour intervals for three days. The mean volume, mass motility, progressive motility, sperm viability, sperm concentration and proportion of spermatozoa with normal acrosome, mid-piece and tail of fresh semen of Buck 1 and Buck 2 were 370.0 ± 0.1 and 410.0 ± 0.1 μl, 3.3 ± 0.4 and 3.4 ± 0.1, 74.0 ± 13.9 and 76.0 ± 6.5%, 82.3 ± 7.5 and 84.3 ± 4.2%, 2730.0 ± 740.9 × 106/ml and 2584.0 ± 470.1 × 106/ml, and 93.3 ± 2.9 and 94.9 ± 0.4%, respectively. The progressive motility in chilled semen of Buck 1 at days 1, 2 and 3 was 61.2 ± 7.3, 51.0 ± 7.3 and 39.0 ± 5.5%, respectively; in Buck 2, it was 60.6 ± 6.8, 50.2 ± 6.2 and 39.2 ± 5.4%, respectively. The difference in semen parameters among days of preservation was significant (P&lt;0.05) in both bucks. The proportion of spermatozoa with normal acrosome, mid-piece and tail in chilled semen of Buck 1 at days 1, 2 and 3 was 88.0 ± 7.0, 88.8 ± 5.9 and 87.1 ± 7.7%, respectively; in Buck 2, it was 86.6 ± 4.8, 84.1 ± 4.6 and 81.8 ± 4.9%, respectively. It is suggested that the characteristics of fresh semen of these two Boer-cross bucks were within normal range. The quality of semen of Boer-cross bucks deteriorated with chilling up to 72 hours. Improvement of the preservation protocol is required to obtain satisfactory quality of chilled semen of Boer-cross bucks.&#x0D; Bangl. vet. 2022. Vol. 39, No. 1-2, 34–42

Effect of Mito-TEMPO on Post-thawed Semen Quality in Goats

Background: Although sperm cryopreservation seems to be an efficient technique for distributing competent sperm for artificial insemination, the process affects the quality of post-thawed sperm. Objectives: This study was designed to see how the novel mitochondria-targeted antioxidant “Mito-TEMPO” affected buck sperm quality during cryopreservation. Methods: After proper semen samples collection, they were diluted and divided into 5 equal groups and cryopreserved in liquid nitrogen with 0, 1, 10, 100, and 1000 µM Mito-TEMPO. Sperm motility, lipid peroxidation, abnormal morphology, acrosome integrity, membrane integrity, and viability were all evaluated after thawing. Results: When the freezing extender was supplemented with 10 µM Mito-TEMPO, total motility, progressive motility, membrane integrity, acrosome integrity, and viability increased (P≤0.05), while lipid peroxidation decreased (P≤0.05). Conclusion: Finally, the novel mitochondria-targeted antioxidant “Mito-TEMPO” could be introduced as an effective cryo-additive to improve buck semen quality parameters during cryopreservation.

Post-Thaw Parameters of Buck Semen Quality after Soy Lecithin Extender Supplementation with Fumaric Acid.

The supplementation of cryopreservation media with antioxidants improves the post-thaw quality and fertilizing ability of spermatozoa. To maximize the fertility of frozen-thawed buck spermatozoa, further research is required to overcome obstacles that have yielded controversial results and standardize protocols. In the present work, the effect of adding fumaric acid (a well-described antioxidant) to a soy lecithin semen extender on certain quality parameters of spermatozoa following freezing and thawing was examined for the first time. Five sexually mature Skopelos bucks were used, and ejaculates were collected with an artificial vagina. The semen samples (98 samples, five replicates) were diluted (400 × 106 spermatozoa/mL) with OviXcell®, supplemented with fumaric acid (0 mM, 2.15 mM, 10 mM or 30 mM), equilibrated (5 °C; 3 h), packed (0.5 mL straws), frozen and stored (-196 °C) until further processing. After thawing, the spermatozoa total and progressive motility (CASA), viability (eosin-nigrosin), membrane functional integrity (HOST), acrosome integrity (SpermBlue®) and mitochondrial function (Rhodamine-123/SYBR-14/PI) were evaluated. Statistical analysis was performed with one-way ANOVA, followed by Duncan's test; significance was set at 0.05. The addition of 2.15 mM fumaric acid improved (p < 0.05) spermatozoa viability, membrane functional integrity, acrosome integrity and mitochondrial function compared to all other concentrations. The addition of 30 mM fumaric acid decreased (p < 0.05) spermatozoa viability and mitochondrial function compared to all other concentrations. These results indicate a beneficial effect of a 2.15 mM fumaric acid addition to a soy lecithin extender on post-thaw buck spermatozoa quality. Further research is required to evaluate the in vivo fertility of frozen-thawed buck spermatozoa treated with fumaric acid, as well as to elucidate the mechanism of action of fumaric acid in spermatozoa.

Impact of chilling duration on sperm quality of indigenous buck semen in the Coastal Area of Bangladesh

Background: Assessing semen characteristics is an important step before semen preservation. This study aimed to collect, evaluate, and preserve indigenous buck semen in the coastal area of Bangladesh. Methods: The study was conducted at the Theriogenology and Animal Reproductive Biotechnology Laboratory, Department of Medicine, Surgery and Obstetrics, Patuakhali Science and Technology University, from July 2021 to June 2022. We selected four bucks based on non-return rate, pregnancy rate of does, and various parameters including age, body weight, scrotal circumference, and testicular epididymal length. These selected animals received a regimen of vitamins, minerals, anthelmintics, and concentrated feed. Semen was collected using the artificial vagina method, and data on color, odor, volume, viscosity, mass activity, consistency, concentration, and individual sperm motility were recorded and analyzed after collection. Results: The semen of bucks exhibited a creamy white color and a fishy odor. The mean (±SD) of scrotal circumference (SC) of four bucks was 20.43±0.52, while the testicular epididymal length (TEL) was 11.03±0.59. Buck-2 (B-2) and buck-1 (B-1) showed significantly (p&lt;0.05) higher volumes than buck-3 (B-3), and buck (B-4). B-1 also displayed significantly (p&lt;0.05) higher mass activity compared to B-2, B-3, and B-4. In addition, B-2 and B-1 showed significantly (p&lt;0.05) greater consistency than B-3, and B-4. The highest concentrations were observed in B-2 and B-1 compared to B-3 and B-4. In terms of individual sperm motility, B-1 showed significantly (p&lt;0.05) higher motility (81.0±05.16) than B-2 (71.0±03.94), B-3 (66.0±03.94), and B-4 (80.0±07.45). Regarding chilling duration, a significant reduction in sperm motility was observed during storage at 4°C. This indicated that sperm motility varied significantly (p ≤ 0.000) with varying chilling durations. Conclusions: The study suggests that the individual progressive sperm motility at 4°C gradually decreases but remains suitable for artificial insemination up to 72 h (≥50±7.65). B-1 and B-2 demonstrated relatively promising results in semen evaluation and preservation. Further study is necessary to determine the pregnancy rate of does after insemination with chilled semen.

Zinc oxide and selenium nanoparticles can improve semen quality and heat shock protein expression in cryopreserved goat (Capra hircus) spermatozoa

BackgroundReactive oxygen species (ROS) are strongly linked with oxidative stress (OS) generated during the process of sperm cryopreservation. Indeed, cellular damage from ROS has been implicated during sperm cryopreservation which causes deterioration in sperm quality and antioxidant nanoparticles (NPs) have been successful in preventing such damage. The interaction of NPs with sperm cells has been less frequently explored in farm animals. ObjectiveThe present study explored the effect of NP supplementation on sperm ultrastructure, potential interaction with sperm membrane (plasma and acrosome membrane), heat shock protein (HSP) gene expression levels and sperm quality in cryopreserved buck semen. Materials and methodsThirty-two (32) ejaculates were collected from four (4) adult male bucks and then diluted in Tris- citric acid- fructose- egg yolk (TCFY) extender containing the Zinc-oxide (ZnO) and Selenium (Se) NP treatments (T0: Control; TZn: 0.1 mg/mL ZnO NPs and TSe: 1 µg/mL Se NPs) after initial evaluation. Diluted semen was packed in 0.25 mL French mini straws and then stored in liquid nitrogen (LN2). Sperm parameters, lipid peroxidation (LPO) profile, sperm head morphology ultrastructural classification under transmission electron microscope (TEM), potential interaction of NPs with sperm membrane and expression of HSP genes were evaluated in the different treatment groups. ResultsWe found a significant (p < 0.05) increase in the percentage of spermatozoa with intact plasma membrane, and intact acrosome in the ZnO (0.1 mg/mL) and Se (1 µg/mL) NP supplemented groups in comparison to the frozen control group. TEM assessment revealed no internalization of both ZnO and Se NPs into the sperm structure. Few occasional contacts of ZnO NPs with the sperm membrane and a few agglomerates of Se NPs around the area of damaged membranes were visualized. HSP70 and HSP90 mRNA levels were significantly (p < 0.001) higher in the NP supplemented groups in comparison to the control. HSP70 and HSP90 mRNA levels had a strong positive association with sperm motility and a weak to moderate association with other sperm parameters. ConclusionsCurrent findings indicated that ZnO NPs are more potent than Se NPs in ameliorating peroxidative damages during sperm cryopreservation, increases semen quality parameters possibly by increasing the expression levels of HSP genes in buck semen. Furthermore, NP supplementation may have a potential role in preserving sperm head ultrastructure by acting as an antioxidant and reducing OS during various degrees of cellular insults, which needs to be further explored.

Increase of the motility of buck semen with Andromed® extender and the addition of HTF

Objective: To test whether HTF (Human Tubal Fluid) is capable of protecting goat sperm cells increasing the semen m Objective: To determine if HTF (Human Tubal Fluid) can protect buck sperm cells, increasing semen motility when used by itself or combined with the Andromed® commercial extender. Design/Methodology/Approach: The semen of eight bucks of the Boer breed was used (10 ejaculates per male). Each ejaculate was diluted in three treatments (5 repetitions per treatment): 1) only Andromed®; 2) only HTF; and 3) Andromed® + HTF. The following variables were evaluated: mass motility (MM) and progressive motility (MP) in fresh (37 °C) and refrigerated (5 °C) semen. The differences between treatments were detected, based on the MM and MP in fresh and refrigerated semen variables, using the GLM procedure (SAS V9). In the case of the MM evaluated in three different periods, the measures repeated over time were analyzed using the Proc Mixed procedure (SAS V9). Results: Regarding the quality of fresh spermatozoa, MM and MP recorded similar values (p&gt;0.05) for the three treatments. On the one hand, MM registered 97.1% for Andromed®, 95.8% for HTF, and 97.5% for Andromed® + HTF; its highest value was achieved with the Andromed® + HTF combination, followed by Andromed® and HTF. On the other hand, the highest MP percentage was observed with the combination of Andromed® + HTF (91.0%), followed by Andromed® (90.4%), and HTF (89.0%). Regarding the quality of the sperm refrigerated at 5 °C, the combination of Andromed® + HTF had a higher MP value (p&lt;0.05) than other treatments. Study Limitations/Implications: In all the evaluated treatments, the motility of sperm decreased over time (0 to 24 hours after cooling); however, the treatments with Andromed®, and Andromed®+HTF maintained a high motility. Findings/Conclusions: The combination of Andromed® and HTF can be used to dilute both fresh and cooled semen.

Comparative analysis of different metabolites in semen of Guanzhong dairy goats with different motility rates

In order to explore the different metabolites of buck semen with different motility stored at 4 °C, the semen of bucks was collected by artificial vagina. The collected semen was divided into high motility group and low motility group after treatment, with 6 replicates set for each group. The semen metabolites of high motility group and low motility group were detected by Liquid Chromatography-Mass Spectrometry (LC-MS). The results showed that 101 different metabolites were detected in the high and low motility groups of bucks, of which 48 metabolites were significantly up-regulated (P < 0.05) and 53 metabolites were significantly down regulated (P < 0.05). Most of these metabolites belonged to lipids and lipid-like molecules, organic acids and their derivatives, and organic oxygen compounds, which were mainly related to energy metabolism. According to the functional enrichment analysis of the former differential metabolites in KEGG database, the top 20 most representative metabolic pathways were detected, among which the glycerophospholipid metabolic pathways changed significantly. From the perspective of metabolomics, this study revealed the differences of metabolites and characteristic compounds of semen with different motility of bucks under low temperature preservation, which provided a scientific basis for the preservation and utilization of semen of Guanzhong dairy goats in the future.

Influence of date palm pollen grain extract on rabbit buck semen characteristics throughout chilled storage period of 72 h

Influence of date palm pollen grain extract on rabbit buck semen characteristics throughout chilled storage period of 72 h

Motility of rabbit buck semen extended with quail-egg yolk and turkey egg yolk citrate as rabbit buck semen extenders at refrigerated temperature

Motility of rabbit buck semen extended with quail-egg yolk and turkey egg yolk citrate as rabbit buck semen extenders at refrigerated temperature

Microbial composition of goat buck's ejaculates is modified by the process of preparing and storing refrigerated semen doses

Ejaculates present their own microbiota, and a link between ejaculates' microbiota and sperm quality and fertility exists. With the development of artificial insemination in animal breeding, ejaculates must be manipulated by diluting them with extenders and storing them at temperatures below body temperature. The effects that these processes have on the original semen microbiota have never been studied. This study explores the effects of the protocol for preparing refrigerated goat buck semen doses and storing on seminal microbiota. Semen from six adult goat bucks of the Murciano-Granadina breed (24 ejaculates) was used, cooled to 4 °C in a skimmed milk-based extender, and stored at this temperature for 24 h. Samples were taken in different steps: in the raw ejaculates (ejaculates), after dilution with the refrigeration extender (diluted), immediately after reaching 4 °C (chilled 0 h) and the samples refrigerated at 4 °C and stored at this temperature for 24 h (chilled 24 h). Sperm quality (motility and integrity of plasma and acrosomal membrane, and mitochondrial functionality) was also evaluated. Bacterial 16S rRNA sequencing was used to study the seminal microbiota. Our results indicated that both refrigeration and storage at 4 °C negatively affected sperm quality parameters. Preparing semen doses and their subsequent conservation caused a significant change in the bacterial community structure. Raw ejaculates showed a lower Pielou's evenness index than the other samples (diluted, chilled 0 h and chilled 24 h). Ejaculates also had a lower Shannon's diversity index (3.44) than the diluted semen (4.17) and the semen chilled for 24 h (4.43). Regarding beta diversity, significant differences were detected between ejaculates and the other treatments. Differences were also found in unweighted UniFrac distances between the semen chilled for 0 h and that chilled for 24 h. At the genus level, marked effects of preparing doses and their subsequent conservation were also evident: 199 genera that were absent in ejaculates were found in the semen chilled and stored for 24 h; 177 genera that were present in ejaculates disappeared after 24-h refrigeration. In conclusion, the extender and protocol for preparing refrigerated goat buck semen doses considerably modify microbial ejaculate composition.

Study of Certain Biochemical Attributes of Pantja Buck Semen

The current study was conducted to study biochemical attributes of Pantja Buck semen. For this purpose six mature healthy bucks were selected from the Goat Unit maintained at Department of Livestock Production Management, College of Veterinary and Animal Sciences, Pantnagar, Uttarakhand (India). All the experimental bucks were kept under similar feeding and management conditions. Semen collection was done early morning by artificial vagina method. Total 36 semen samples were collected for a period of 3 months. Immediately after the collection, samples were examined for biochemical attributes. Overall mean value of pH was found (6.61 ± 0.02) independent of buck age. Resazurin and Methylene blue reduction time were noted higher for younger bucks and minimum for older bucks with overall value 3.15 ± 0.25 and 6.04±0.36 min. respectively. Mean values of HOST and Millovanov’s resistance test were recorded as 36.10 ± 1.17 % and 5216.70 ± 1.94 respectively. 16.76 ± 0.86 % sperms were found resistance to cold shock.

In vivo Fertility Assessment of Frozen Thawed Pantja Buck Semen

Background: Pantja is a medium sized, dual purpose Tarai goat breed of Uttarakhand and adjacent area of Uttar Pradesh. Due to the lack of pure breeding buck and uncontrolled cross breeding, population of this breed is reducing continuously. Therefore, for preservation and dissemination of this pure breed, cryopreservation of semen and artificial insemination by using frozen thawed semen can play a crucial role. Methods: Semen samples were collected from four sexually matured Pantja bucks and after preliminary evaluation extended in tris egg yolk based extender. Post thaw semen was examined for microscopical and certain biochemical evaluation. A total 12 does were inseminated and pregnancy diagnosis was conducted at 45 days onwards by ultrasonography. Result: Post thaw seminal attributes were significantly (P£0.01) reduced in comparision to freshly diluted semen. Total six does (50.00%) were pregnant and five (83.33%) of them gave birth to healthy kids. Among these five, three does (60.00%) gave birth to single and two does (40.00%) gave birth to twins.

Effect of clarified tris egg yolk citrate diluter and seminal plasma removal on plasma membrane integrity in cryopreserved Surti buck semen

Effect of clarified tris egg yolk citrate diluter and seminal plasma removal on plasma membrane integrity in cryopreserved Surti buck semen