scholarly journals Impulse lethal control and contraception control of seasonal breeding rodent

2017 ◽  
Vol 2017 (1) ◽  
Author(s):  
Hanwu Liu ◽  
Fengqin Zhang ◽  
Qiuying Li
Keyword(s):  
Seasonal Breeding ◽  
Lethal Control ◽  
Contraception Control

scholarly journals Guidance on validation of lethal control measures for foodborne pathogens in foods

2021 ◽  
Author(s):  
Erdogan Ceylan ◽  
Alejandro Amezquita ◽  
Nathan Anderson ◽  
Roy Betts ◽  
Laurence Blayo ◽  
...  
Keyword(s):  
Foodborne Pathogens ◽  
Control Measures ◽  
Lethal Control

scholarly journals Thyroid hormones and seasonal reproductive neuroendocrine interactions

Reproduction ◽  
2008 ◽  
Vol 136 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Nobuhiro Nakao ◽  
Hiroko Ono ◽  
Takashi Yoshimura
Keyword(s):  
Thyroid Hormone ◽  
Thyroid Hormones ◽  
Biological Process ◽  
Critical Role ◽  
Day Length ◽  
Seasonal Reproduction ◽  
Seasonal Breeding ◽  
Length Changes ◽  
Neuroendocrine Axis ◽  
The Brain

Many animals that breed seasonally measure the day length (photoperiod) and use these measurements as predictive information to prepare themselves for annual breeding. For several decades, thyroid hormones have been known to be involved in this biological process; however, their precise roles remain unknown. Recent molecular analyses have revealed that local thyroid hormone activation in the hypothalamus plays a critical role in the regulation of the neuroendocrine axis involved in seasonal reproduction in both birds and mammals. Furthermore, functional genomics analyses have revealed a novel function of the hormone thyrotropin. This hormone plays a key role in signaling day-length changes to the brain and thus triggers seasonal breeding. This review aims to summarize the currently available knowledge on the interactions between elements of the thyroid hormone axis and the neuroendocrine system involved in seasonal reproduction.

scholarly journals The olfactory secretome varies according to season in female sheep and goat

2019 ◽  
Author(s):  
Paul CANN ◽  
Malika CHABI ◽  
Aliénor DELSART ◽  
Chrystelle LE DANVIC ◽  
Jean-Michel SALIOU ◽  
...  
Keyword(s):  
Sexual Activity ◽  
Hormonal Control ◽  
Physiological Status ◽  
Sexually Active ◽  
Hormonal Changes ◽  
Seasonal Breeding ◽  
Proteomics Data ◽  
Specific Expression ◽  
Two Dimensional Gel Electrophoresis ◽  
Post Translational Modifications

Abstract Abstract: Background : Small ungulates (sheep and goat) display a seasonal breeding, characterised by two successive periods, sexual activity (SA) and sexual rest (SR). Odours emitted by a sexually active male can reactivate the ovulation of anoestrus females. The plasticity of the olfactory system under these hormonal changes has never been explored at the peripheral level of odours reception. As it was shown in pig that the olfactory secretome (proteins secreted in the nasal mucus) could be modified under hormonal control, we monitored its composition in females of both species through several reproductive seasons, thanks to a non-invasive sampling of olfactory mucus. For this purpose, two-dimensional gel electrophoresis (2D-E), western-blot with specific antibodies, MALDI-TOF and high-resolution (nano-LC-MS/MS) mass spectrometry, RACE-PCR and molecular modelling were used. Results : In both species the olfactory secretome is composed of isoforms of OBP-like proteins, generated by post-translational modifications, as phosphorylation, N-glycosylation and O -GlcNAcylation. Important changes were observed in the olfactory secretome between the sexual rest and the sexual activity periods, characterised in ewe by the specific expression of SAL-like proteins and the emergence of OBPs O- GlcNAcylation. In goat, the differences between SA and SR did not come from new proteins expression, but from different post-translational modifications, the main difference between the SA and SR secretome being the number of isoforms of each protein. Proteomics data are available via ProteomeXchange with identifier PXD014833. Conclusion : Despite common behaviour, seasonal breeding, and genetic resources, the two species seem to adapt their sensory equipment in SA by different modalities: the variation of olfactory secretome in ewe could correspond to a specialization to detect male odours only in SA, whereas in goat the stability of the olfactory secretome could indicate a constant capacity of odours detection suggesting that the hallmark of SA in goat might be the emission of specific odours by the sexually active male. In both species, the olfactory secretome is a phenotype reflecting the physiological status of females, and could be used by breeders to monitor their receptivity to the male effect.

Seasonal reproduction in the highveld mole-rat, Cryptomys hottentotus pretoriae (Rodentia: Bathyergidae)

2002 ◽  
Vol 80 (5) ◽  
pp. 810-820 ◽  
Author(s):  
L Janse van Rensburg ◽  
N C Bennett ◽  
M van der Merwe ◽  
A S Schoeman
Keyword(s):  
Body Mass ◽  
Reproductive Tract ◽  
Plasma Testosterone ◽  
Breeding Period ◽  
Corpora Lutea ◽  
Seasonal Breeding ◽  
Nonbreeding Season ◽  
Ovarian Histology ◽  
Mole Rat ◽  
Reproductive Females

The highveld mole-rat, Cryptomys hottentotus pretoriae, is a cooperatively breeding rodent that exhibits seasonal breeding and a reproductive division of labour. Body mass, reproductive-tract morphometrics, ovarian histology, and plasma oestrogen and progesterone concentrations were studied for both reproductive and non-reproductive females from 55 colonies, the main objective being to determine the inclination of this species towards seasonal breeding. Offspring are born from July through to November. However, qualitative analysis of ovarian histology revealed that reproductive females retain the potential for ovulation and subsequent production of corpora lutea during the late-summer nonbreeding period (December–March). Seasonal differences were found in ovarian morphometrics and hormone concentrations that are associated with enhanced follicular activation in April and May and subsequent conceptions from July through to November during the breeding period. The nonbreeding period coincides with maximal dispersal opportunities in the summer-rainfall areas inhabited by the highveld mole-rat. Body mass, reproductive-tract morphometrics, testicular histology, and plasma testosterone concentrations were determined for reproductive and non-reproductive males from 37 colonies. Available evidence suggests that there is a gradual increase in testicular mass for reproductive males as the breeding season approaches, but after September the testicular parameters fall. Seminiferous-tubule diameter was significantly greater in reproductive males but exhibited no seasonal variation. Testosterone concentrations were higher in reproductive males. Current data support a lack of gonadal regression in males during the nonbreeding season.

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