Changes in plasma testosterone, thyroxine and triiodothyronine in relation to sperm production and remex moult in domestic ganders

Zeman, Michal; Kosutzký, J; Micek, L.; Lengyel, Ana‐Maria J.

doi:10.1051/rnd:19900410

Cited by 14 publications

(9 citation statements)

References 16 publications

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“…T3 directly regulates Sertoli and Leydig cell functions which in turn indirectly modulate testosterone synthesis by Leydig cells [47]. It has been shown that the peak of plasma T3 levels coincided with the rise of testosterone concentrations in domestic ganders [48]. In Iranian fat-tailed rams, the peak circulating T3 was observed when testosterone reached the maximum level and corresponding to the time of the year when sexual activity reached its highest level [18].…”

Section: Discussionmentioning

confidence: 99%

Potential factors affecting semen quality in the Asian elephant (Elephas maximus)

Thongtip

Saikhun

Mahasawangkul³

et al. 2008

Reprod Biol Endocrinol

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BackgroundOne of the major obstacles in using artificial insemination to manage genetics of elephant population in captivity is the large variations in semen quality among ejaculates within the same and among individuals. The objectives of this study were to determine the influences of (1) age (2) seasonality (3) and circulating testosterone (SrTest), triiodothyronine (SrT3) and tetraiodothyronine (SrT4), as well as seminal (4) testosterone (SpTest), zinc (SpZn) and protein (SpTP) on semen quality in the Asian elephantMethodsAnalyses, including motility, viability and morphology were performed in semen samples collected twice monthly from 13 elephant bulls (age range, 10-to 72-years) by manual stimulation between July 2004 and June 2005. Serum samples obtained monthly were assessed for SrTest, SrT3, SrT4, and seminal plasma samples were evaluated for, SpTest, SpZn and SpTP.ResultsThe highest semen quality was observed at age 23 to 43 years. Percentages of progressive motility and viable sperm were lowest at age 51 to 70 years (P < 0.05); on the other hand, sperm concentration was lowest at age 10 to 19 years (P < 0.05). Percentage of sperm with normal morphology was highest at age 23 to 43 years. The levels of SrT3, SrTest, SpTest and SpZn were lowest at age 51 to 70 years, whereas SrT4 was lowest at age 23 to 43 years. Seasonality significantly affected semen characteristics in which percentage of viable sperm and cell concentration were highest during rainy season and lowest during summer months (P < 0.05). However, percentage of sperm with normal morphology was highest in summer and lowest in rainy season (P < 0.05). Seasonality significantly influenced SrTest with elevated concentrations observed in rainy season and winter (P < 0.05).ConclusionThis study indicates that age and seasonality had influence on semen characteristics in the Asian elephant. The knowledge obtained in this study will improve our understanding of the reproductive biology of this species.

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Section: Discussionmentioning

confidence: 99%

Potential factors affecting semen quality in the Asian elephant (Elephas maximus)

Thongtip

Saikhun

Mahasawangkul³

et al. 2008

Reprod Biol Endocrinol

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“…Thyroid hormones as affected by seasons of the year are shown in (table 6). It has been shown that the peak of plasma T3 levels coincided with the rise of testosterone concentrations in domestic ganders Zeman (1990). The study of Guerrini and Bartchinger (1983) clarified that the decrease in T3 level was correlated with the increase in rectal temperature, under hot climate conditions.…”

Section: Parametersmentioning

confidence: 92%

Association of Hsp70 Gene Polymorphism And Bull Semen Quality In Winter And Summer Seasons

Gafer¹,

El-Rahman²,

Rawash³

2015

AJVS

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Objectives of current study were to identify single nucleotide polymorphisms (SNP) in heat shock protein70 (HSP70) promoter gene of bulls (cattle and buffalo) and its association with semen quality traits and some enzymatic, hormonal and lipid parameters during winter and summer seasons. Semen samples of 37 animals (Cattle n=21 and buffalo n=16), were used in the study. Biochemical Parameter and hormonal profile were estimated. Qualities of some of fresh and frozen-thaw semen were evaluated. PCR-SSCP was used to detect SNPs and different patterns were sequenced. The study demonstrate all the measured biochemical parameters and hormonal profile of cattle and buffalo were significantly different (P<0.05) in winter as compared to summer. Results of PCR-SSCP and sequencing detected a new synonymous SNP 812 T>C transition was the same in both species and could clear two genotypes TT and TC. Association analysis revealed significance difference (P<0.001) with all the fresh and some of frozen-thawed semen traits in cattle population and T allele seemed to be the favorable allele. Regarding to buffalo population, different genotypes has significant difference in term of fresh motility, frozen motility at 1h and viability index. The results of association between biochemical and hormonal parameters there were no significance except for Aspartate-aminotransferase (AST) in cattle population and T 3 level in buffalo population and C allele appeared to be the favorable allele. This the first study concerned with the association of HSP70 polymorphisms and semen quality, in winter and summer seasons in buffalo population. Conclusion: High temperature has negative impact on semen quality. Biochemical and hormonal profile can be used as good indicator for semen value. Polymorphisms in HSP70 gene can affect semen quality. We suggest to be used in artificial insemination programs as marker assisted selection for anti-heat stress and good reproductive bulls.

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“…Moreover, it is well established that thyroid hormones play an important role in the regulation of seasonal breeding and other physiological activities such as growth and molting [ 33 , 34 ]. In many seasonal breeding animals and birds, there is a reciprocal relationship between the plasma concentrations of thyroid hormones and testosterone [ 34 – 38 ]. Based on previous findings showing that thyroidectomy could prevent the development of photorefractoriness in both avian and mammalian species [ 34 , 39 , 40 ], recent investigations in Japanese quail ( Coturnix japonica ) showed that light-induced thyroid hormone synthesis in the mediobasal hypothalamus (MBH) is responsible for the regulation of the neuroendocrine axis involved in seasonal reproduction [ 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Reproductive axis gene regulation during photostimulation and photorefractoriness in Yangzhou goose ganders

et al. 2017

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BackgroundThe Yangzhou goose is a long-day breeding bird that has been increasingly produced in China. Artificial lighting programs are used for controlling its reproductive activities. This study investigated the regulations of photostimulation and photorefractoriness that govern the onset and cessation of the breeding period.ResultsIncreasing the daily photoperiod from 8 to 12 h rapidly stimulated testis development and increased plasma testosterone concentrations, with peak levels being reached 2 months after the photoperiod increase. Subsequently, testicular activities, testicular weight, spermatogenesis, and plasma testosterone concentrations declined steadily and reached to the nadir at 5 months after the 12-hour photoperiod. Throughout the experiment, plasma concentrations of triiodothyronine and thyroxine changed in reciprocal fashions to that of testosterone. The stimulation of reproductive activities caused by the increasing photoperiod was associated with increases in gonadotropin-releasing hormone (GnRH), but decreases in gonadotropin-inhibitory hormone (GnIH) and vasoactive intestinal peptide (VIP) gene messenger RNA (mRNA) levels in the hypothalamus. In the pituitary gland, the levels of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) mRNA abruptly increased during the longer 12-hour photoperiod. The occurrence of photorefractoriness was associated with increased GnIH gene transcription by over 250-fold, together with increased VIP mRNA levels in the hypothalamus, and then prolactin and thyroid-stimulating hormone in the pituitary gland. FSH receptor, LH receptor, and StAR mRNA levels in the testis changed in ways paralleling those of testicular weight and testosterone concentrations.ConclusionsThe seasonal reproductive activities in Yangzhou geese were directly stimulated by a long photoperiod via upregulation of GnRH gene transcription, downregulation of GnIH, VIP gene transcription, and stimulation of gonadotrophin. Development of photorefractoriness was characterized by hyper-regulation of GnIH gene transcription in the hypothalamus, in addition of upregulation of VIP and TRH gene transcription, and that of their receptors, in the pituitary gland.

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Changes in plasma testosterone, thyroxine and triiodothyronine in relation to sperm production and remex moult in domestic ganders

Cited by 14 publications

References 16 publications

Potential factors affecting semen quality in the Asian elephant (Elephas maximus)

Potential factors affecting semen quality in the Asian elephant (Elephas maximus)

Association of Hsp70 Gene Polymorphism And Bull Semen Quality In Winter And Summer Seasons

Reproductive axis gene regulation during photostimulation and photorefractoriness in Yangzhou goose ganders

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