Nadia CHERGUI, Nouria BOUKENAOUI FERROUK, Salima CHARALLAH CHERI, Farida KHAMMAR, Zaina AMIRAT, Pierre MORMEDE

Sahra Çölü’ne Özgü Antilopların Testis ve Hipofiz-Tiroid AksıAktivitelerinin Yıllık ve Mevsimsel Değişimleri

Bu çalışma, Sahra Çölü’ne özgü yerli antilopların morfometrik parametreler, seksüel ve tiroid aktivitelerinin tanımlanan karşılaştırmalı yıllık ve mevsimsel modellerinin araştırılması için yapılmıştır. Vücut ağırlığı, testis hacmi, radyoimmünoassay ile ölçülen plazma testosteron konsantrasyonu ve TSH, FT3 ve FT4 plazma konsantrasyonlarının enzim işaretli floresan yöntemiyle ölçülmesiyle belirlenen hipofiztiroid eksen aktivitesinin mevsimsel modellerini belirlemek için yedi adet yetişkin antilop kullanıldı. Sonuçlar, vücut ağırlığının Ocak ayında, testis hacminin Aralık ile Şubat ayları arasında ve plazma testosteron konsantrasyonunun Mart ayında minimum seviyelerde yer alarak aylık ve mevsimsel varyasyonlar sergilediğini; çevre sıcaklığının ve fotoperiyodun en yüksek olduğu Temmuz, Ağustos ve Eylül aylarında bu değerlerin maksimum seviyelere aşamalı olarak yükseldiğini gösterdi. Ekim ayında, vücut ağırlığı ve testis hacminden önce testosteron seviyelerinde hızlı bir düşüş saptandı (P

Annual and Seasonal Variations of Testicular and Pituitary-Thyroid Axis Activities in Bucks Native to Sahara Desert

This study was conducted to assess comparative annual and seasonal patterns described in morphometric parameters, sexual and thyroid activities in indigenous bucks native to Sahara Desert. Seven adult bucks were used to establish seasonal patterns of body weight, testicular volume, plasma testosterone concentration measured by radioimmunoassay and pituitary-thyroid axis activity estimated by plasma concentrations of TSH, FT3 and FT4 measured by enzyme-linked fluorescent assay. The results showed monthly and seasonal variations characterized by a minimum in January for body weight, from December to February for testicular volume, followed by plasma testosterone concentration in March; they progressively increased to their respective maxima reached in July, August and September when ambient temperature and photoperiod were the highest. In October, there was a rapid fall in testosterone levels, preceding that of body weight and testicular volume (P

PDF

___

1. Bertolini F, Servin B, Talenti A, Rochat E, Kim ES, Oget C, Palhière I, Crisà A, Catillo G, Steri R, Amills M, Colli L, Marras G, Milanesi M, Nicolazzi E, Rosen BD, Van Tassell CP, Guldbrandtsen B, Sonstegard TC, TosserKlopp G, Stella A, Rothschild MF, Joost S, Crepaldi P, AdaptMap consortium: Signatures of selection and environmental adaptation across the goat genome post-domestication. Genet Sel Evol, 50:57, 2018. DOI: 10.1186/s12711-018-0421-y
2. Joy A, Dunshea FR, Leury BJ, Clarke IJ, DiGiacomo K, Chauhan SS: Resilience of small ruminants to climate change and increased environmental temperature: A review. Animals, 10 (5): 867, 2020. DOI: 10.3390/ani10050867
3. Swelum AAA, Saadeldin IM, Ba-Awadh H, Alowaimer AN: Shortened daily photoperiod during the non-breeding season can improve the reproductive performance of camel bulls (Camelus dromedarius). Anim Reprod Sci, 195, 334-344, 2018. DOI: 10.1016/j.anireprosci.2018.06.014
4. Schneider JE, Wise JD, Benton NA, Brozek JM, Keen-Rhinehart E: When do we eat? Ingestive behavior, survival, and reproductive success. Horm Behav, 64 (4): 702-728, 2013. DOI: 10.1016/j.yhbeh.2013.07.005
5. Lomet D, Cognié J, Chesneau D, Dubois E, Hazlerigg D, Dardente H: The impact of thyroid hormone in seasonal breeding has a restricted transcriptional signature. Cell Mol Life Sci, 75, 905-919, 2018. DOI: 10.1007/ s00018-017-2667-x
6. Gupta M, Mondal T: Heat stress and thermoregulatory responses of goats: A review. Biol Rhythm Res, 52 (3): 407-433, 2021. DOI: 10.1080/ 09291016.2019.1603692
7. Mader TL, Davis MS, Brown-Brandl T: Environmental factors influencing heat stress in feedlot cattle. J Anim Sci, 84 (3): 712-719, 2006. DOI: 10.2527/2006.843712x
8. Howard JG, Wildt DE, Chakraborty PK, Bush M: Reproductive traits including seasonal observations on semen quality and serum hormone concentrations in the Dorcas gazelle. Theriogenology, 20 (2): 221-234, 1983. DOI: 10.1016/0093-691X(83)90218-2
9. Ritar AJ: Seasonal changes in LH, androgens and testes in the male Angora goat. Theriogenology, 36 (6): 959-972, 1991. DOI: 10.1016/0093- 691X(91)90321-4
10. Darbeïda H, Brudieux R: Seasonal variations in plasma testosterone and dihydrotestosterone levels and in metabolic clearance rate of testosterone in rams in Algeria. J Reprod Fertil, 59 (1): 229-235, 1980. DOI: 10.1530/jrf.0.0590229
11. Allaoui A, Safsaf B, Tlidjane M, Djaalab I, Mansour HD: Effect of increasing levels of wasted date palm in concentrate diet on reproductive performance of Ouled Djellal breeding rams during flushing period. Vet World, 11 (5): 712-719, 2018. DOI: 10.14202/vetworld.2018.712-719
12. Gherissi DE, Afri-Bouzebda F, Bouzebda Z: Seasonal changes in the testicular morphology and interstitial tissue histomorphometry of Sahraoui camel under Algerian extreme arid conditions. Biol Rhythm Res, 49 (2): 291-301, 2018. DOI: 10.1080/09291016.2017.1357331
13. Zarazaga LA, Guzman JL, Dominguez C, Perez MC, Prieto R: Effects of season and feeding level on reproductive activity and semen quality in Payoya buck goats. Theriogenology, 71 (8): 1316-1325, 2009. DOI: 10.1016/j.theriogenology.2009.01.007
14. Charallah S, Lakhdari Y, Amirat Z, Khammar F, Sempere A: Variations saisonnières hormonales de l’activité sexuelle chez la chèvre bédouine. Bull Soc Ecophysiol, 18 (1-2): 67-70, 1993.
15. Chakhma A, Khaldoun-Benabbas M, Charallah-Cherif S, Kassouri S, Khammar F, Amirat Z: Annual changes in plasma progesterone and estradiol-17β concentrations compared to pituitary-adrenal axis activity in the female goat reared under arid environment. Biol Rhythm Res, 52, 1394-1411, 2021. DOI: 10.1080/09291016.2019.1630920
16. Chemineau P, Bodin L, Migaud M, Thiery JC, Malpaux B: Neuroendocrine and genetic control of seasonal reproduction in sheep and goats. Reprod Domest Anim, 45 (s3): 42-49, 2010. DOI: 10.1111/j.1439- 0531.2010.01661.x
17. Ertek S: Molecular economy of nature with two thyrotropins from different parts of the pituitary: Pars tuberalis thyroid-stimulating hormone and pars distalis thyroid-stimulating hormone. Arch Med Sci, 17 (1): 189-195, 2021. DOI: 10.5114/aoms/102476
18. Yasuo S, Nakao N, Ohkura S, Iigo M, Hagiwara S, Goto A, Ando H, Yamamura T, Watanabe M, Watanabe T, Oda S, Maeda K, Lincoln GA, Okamura H, Ebihara S, Yoshimura T: Long-day suppressed expression of type 2 deiodinase gene in the mediobasal hypothalamus of the Saanen goat, a short-day breeder: implications for seasonal window of thyroid hormone action on reproductive neuroendocrine axis. Endocrinology, 147 (1): 432-440, 2006. DOI: 10.1210/en.2005-0507
19. Chergui N, Mormede P, Foury A, Khammar F, Amirat Z: Seasonal effects on plasma cortisol concentrations in the Bedouin buck: Circadian studies and response to ACTH. Animal, 11 (3): 445-451, 2017. DOI: 10.1017/S1751731116001671
20. Todini L: Thyroid hormones in small ruminants: Effects of endogenous, environmental and nutritional factors. Animal, 1 (7): 997-1008, 2007. DOI: 10.1017/S1751731107000262