Testosterone secretion and semen plasma enzyme activity in rams with genital pathology stimulated with GnRH

Aksoy, Melih; Kaya, Ahmet Yalçın; Vatansev, Hüsamettin; Tekeli, Tevfik

doi:10.1016/s0093-691x(02)00700-8

Cited by 3 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present study, melatonin usage has improved the estrus rate in crossbred buffaloes. Usually, buffaloes express their estrus signs in the late evening and early morning ( 37), but no or weak estrus signs were observed during summer in tropical and sub-tropical countries (1,38). It is observed that melatonin administration along various synchronization regimens enhanced estrus expression in different species (39,40) and increased uterine blood flow with estrus induction (41).…”

Section: Discussionmentioning

confidence: 99%

Administration of melatonin prior to modified synchronization protocol improves the productive and reproductive efficiency of Chinese crossbred buffaloes in low breeding season

et al. 2023

View full text Add to dashboard Cite

IntroductionMelatonin is a neurohormone involving various biological processes, including restoration of cyclicity in animals with seasonal breeding patterns. The use of melatonin in different forms has gained broader acceptance in different species, particularly in summer anestrous buffaloes.ObjectivesThe objective of the current study was to evaluate the melatonin effect on the reproductive and productive performance of crossbred buffaloes during the low breeding season.MethodsSixty-five cyclic and reproductively sound crossbred buffaloes were randomly allocated to three groups: the G1 (n = 20) served as the control group and received no single melatonin, G2 received melatonin (n = 22; 18 mg/50 kg, body weight) once prior to synchronization and G3 group was administered multiple melatonin injections (n = 23; 6 mg/50 kg body weight) for three consecutive days before the start of the synchronization protocol. The reproductive performance, milk yield traits, and serum immunoglobulin M (IgM) and melatonin levels were evaluated in treated and untreated crossbred buffaloes.ResultsThe results revealed that a single dose of melatonin administration has (p < 0.05) improved estrus response, ovulation occurrence and follicular growth in crossbred buffaloes compared to control groups. Higher pregnancy rates were observed in both melatonin-treated buffalo groups compared to the control. Following the administration of melatonin, serum IgM level increased in G2 and G3; however, an increment in melatonin level (p < 0.05) was detected in the G2 group only as compared to the control group subsequent day of melatonin administration. The milk compositions were not affected by melatonin administration except for milk urea nitrogen and somatic cell count (SCC). The melatonin administration (p < 0.05) decreased the somatic cell count in buffalo milk compared to untreated.ConclusionIn conclusion, single or multiple doses of melatonin before initiating the synchronization protocol improved the ovulation, ovulatory follicle diameter and pregnancy rates in crossbred buffaloes during the low breeding season. Moreover, the administration of melatonin enhanced the IgM values along milk traits in terms of milk protein, MUN and somatic cell count in treated buffaloes.

show abstract

Section: Discussionmentioning

confidence: 99%

Administration of melatonin prior to modified synchronization protocol improves the productive and reproductive efficiency of Chinese crossbred buffaloes in low breeding season

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Ciereszko et al 17 reported that AST activity in the cauda epididymal fluid was 12–48 times higher than that found in vesicular gland secretion and semen plasma in the boar. Aksoy et al 18 showed that semen plasma AST activity could be used as a tool to evaluate epididymal function in the ram. In agreement with our findings, a significant postoperative decrease in semen plasma AST activity was noted in rams resulting from epididymal obstruction.…”

Section: Discussionmentioning

confidence: 99%

Epididymis Ligation: A Minimally Invasive Technique for Preparation of Teaser Rams

et al. 2010

View full text Add to dashboard Cite

show abstract

Semen quality, testosterone values, and testicular and accessory gland parameters in rams receiving sustained stimulation with low doses of buserelin

et al. 2021

View full text Add to dashboard Cite

ContextThe use of buserelin, a gonadotropin-releasing hormone (GnRH) agonist, can improve semen quality. Nevertheless, the appropriate dosage, and frequency and time of application, remain to be established owing to the subsequent negative feedback on endogenous production of testosterone described so far.AimsThis study aimed to propose a new buserelin application protocol for sperm improvement in Santa Inês rams.MethodsFifteen Santa Inês rams were divided into two experimental groups: the first group (n=8) received 2.5μg buserelin acetate; and the second group (n=7) received saline solution. Treatments were applied for 21 days at intervals of 6h, totalling four hormonal or saline applications per day. In all animals, macroscopic and microscopic seminal characteristics and freezability, plasma testosterone, pixels of testicular parenchyma, and biometric analysis of testicular and accessory sex glands by ultrasound were evaluated throughout the period of hormonal application and for a further 7 days.Key resultsRams receiving buserelin showed a peak of testosterone after the first week (Day 7) of application, with a drop in values at Day 14, followed by negative feedback at Day 21 and return to basal concentrations at Day 28. They also showed improvement of kinetics parameters such as straight line velocity (μm/s: +buserelin 51.5±1.5 > control 46.6±1.6) and linearity coefficient (%: +buserelin 53.5±1.8 > control 47.5±1.9). Ultrasound parameters, pixels of testicular parenchyma, and freezability were not affected by treatment.ConclusionsThe administration of buserelin was able to improve some sperm kinetics parameters of Santa Inês rams.ImplicationsLow doses of this GnRH analogue can be used; however, further adjustments to the hormonal protocol are needed to obtain an effective improvement in sperm quality.

show abstract

Testosterone secretion and semen plasma enzyme activity in rams with genital pathology stimulated with GnRH

Cited by 3 publications

References 29 publications

Administration of melatonin prior to modified synchronization protocol improves the productive and reproductive efficiency of Chinese crossbred buffaloes in low breeding season

Administration of melatonin prior to modified synchronization protocol improves the productive and reproductive efficiency of Chinese crossbred buffaloes in low breeding season

Epididymis Ligation: A Minimally Invasive Technique for Preparation of Teaser Rams

Semen quality, testosterone values, and testicular and accessory gland parameters in rams receiving sustained stimulation with low doses of buserelin

Contact Info

Product

Resources

About