ERKAN PEHLİVAN, HÜSEYİN POLAT, GÜRSEL DELLAL

Annual Change of Reproductive Hormones in Female Angora Goats

In this research, annual changes of melatonin, gonadotropin-releasing hormone, follicle stimulating hormone, luteinizing hormone, estrogen, testosterone and progesterone were studied on 6 heads of 1.5 years old female Angora goat. To determine hormones concentrations, blood samples were taken from jugular vein of each goat in every month for a year. The blood samples were centrifuged at 4000xg for 5 min. and serum was stored at -20°C until analyses time. Hormones analyses in the serum were performed by enzyme immunoassay (EIA) method. Monthly climatic values and photoperiod were obtained from the Turkish State Meteorological Service and temperature-humidity index was calculated with climatic values. In the study, in order to determine any possible differences in the observed hormones concentrations with respect to months, repeated measures ANOVA analysis was performed. As a result of statistical analysis, there were no significant differences among the months for gonadotropin-releasing hormone, follicle stimulating hormone and testosterone concentration, while significant differences were found among the months for melatonin, luteinizing hormone and progesterone, and estrogen concentration in female Angora goats. According the results of this study, could be concluded that the releases of reproductive hormones examined in female Angora goats was seasonally dependent

PDF

___

Abecia JA, Forcada F, Gonzalez-Bulnes A. 2012. Hormonal control of reproduction in small ruminants. Animal Reproduction Science 130: 173– 179.

Alaçam E, Güven B, Ayar A, Saban E. 1999. Effect of gonadoreline administration on blood progesterone, oestradiol 17β concentration and some fertility parameters in Angora goats. Tr. J. of Veterinary and Animal Sciences 23: 77-81.

Alila-Johansson A, Eriksson L, Soveri T, Laakso ML. 2001. Seasonal variation in endogenous serum melatonin profiles in goats: A difference between spring and fall? Journal of Biological Rhythms (16)2: 254-263.

Anderson RR, Harnes JR, Snead AF, Salah MS. 1981. Mammary growth pattern in goats during pregnancy and lactation. J Dairy Sci. 64: 427-432.

Bartlewski PM, Baby TE, Giffin JL. 2011. Reproductive cycle of sheep. Animal Reproduction Science, 124(3-4): 259–268.

Błaszczyk B, Udała J, Gaczarzewicz D. 2004. Changes in estradiol, progesterone, melatonin, prolactin and thyroxine concentrations in blood plasma of goats following induced estrus in and outside the natural breeding season. Small Ruminant Research 51: 209– 219.

Bono G, Cairoli F, Tamanini C, Abrate L. 1983. Progesterone, estrogen, LH, FSH and PRL concentrations in plasma during the estrous cycle in goat. Reprod. Nutr. Develop. 23(2A): 217- 222.

Chemineau P, Malpaux B, Delgadillo JA, Guerin Y, Ravault JP, Thimonier J, Pelletier J. 1992. Control of sheep and goat reproduction: Use of light and melatonin. Anim. Reprod. Sci. 30: 157-184.

Chemineau P, Pelletier J, Guerin Y, Colas G, Ravault JP, Toure G, Almeida G, Thimonier J, Ortovant R. 1988. Photoperiodic and melatonin treatments for the control of seasonal reproduction in sheep and goats. Reprod. Nutr. Develop. 28(2B): 409-422.

Delgadillo JA, Canedo GA, Chemineau P, Guillaume D, Malpaux B, 1999. Evidence for an annual reproductive rhythm independent of foot availability in male Creole Goats in subtropical northern Mexico. Theriogenology 52(4): 727-737.

Dellal G, Cedden F. 2002. Seasonality of reproduction and reproduction and photoperiod relationships in sheep and goat. Hayvansal Üretim 43(1): 64-73 (in Turkish).

Dicks P. 1994. The role of prolactin and melatonin in regulating the timing of the spring moult in the Cashmere goat. European Fine Fiber Network, Occasional Publication No. 2.

Gürbüz F, Baspinar E, Camdeviren H, Keskin S. 2003. Analysis of the repeated measurement experiments. Yüzüncü Yıl University Publications, Van, Turkey (in Turkish).

Fatet A, Pellicer-Rubio MT, Leboeuf B. 2011. Reproductive cycle of goats. Animal Reproduction Science 124(3-4): 211–219.

Gaafar KM, Gabr MK, Teleb DF. 2005. The hormonal profile during the estrous cycle and gestation in Damascus goats. Small Ruminant Research 57: 85–93.

Gebbie FE, Forsyth IA, Arendt J. 1994. Effects of melatonin, bromocriptine and altered light/temperature patterns on coat growth in dairy goats. European Fine Fiber Network, Occasional Publication No. 2.

Gebbie FE, Forsyth IA, Arendt J. 1999. Effects of maintaining solstice light and temperature on reproductive activity, coat growth, plasma prolactin and melatonin in goats. Journal of Reproduction Fertility 116: 25-33.

González-Flores O, Hoffman KL, Delgadillo JA, Keller M, Paredes RG. 2017. Female sexual behavior in rodents, lagomorphs, and goats. Hormones, Brain, and Behavior 3(1): 59-82.

Hafez ESE. 1974. Reproduction in Farm Animals. In Reproductive Life Cycle. Lea and Febriger, Philadelphia.

Kadzere CT, Llewelyn C.A, Chivandi E. 1997. Plasma progesterone, calcium, magnesium and zinc concentrations from estrous synchronization to weaning in indigenous goats in Zimbabwe. Small Rumin. Res. 24: 21–26.

Khanum SA, Hussain M, Kausar R. 2008. Progesterone and estradiol profiles during estrous cycle and gestation in dwarf goats (Capra Hircus). Pakistan Vet. J. 28(1): 1-4.

Malpaux B, Viguie C, Ravault JP, Thiery JC, Chemineau P. 1994. Photoperiodic and neuroendocrine control of seasonal reproductive functions in the ovine and caprine species. European Fine Fiber Network, Occasional Publication No: 2.

Marai IFM, Ayyat MS, Abd El-Monem UM. 2001. Growth performance and reproductive traits at first parity of New Zealand White female rabbits as affected by heat stress and its alleviation under Egyptian conditions. Trop. Anim. Health and Prod. 33: 451-462.

Marai IFM, El-Darawany AA, Fadiel A, Abdel-Hafez MAM. 2007. Physiological traits as affected by heat stress in sheep-a review. Small Rumin. Res. 71: 1-12.

Özdemir H. 2009. The structural and breeding characteristics of Angora goat rearing in Turkey. PhD thesis (unpublished). Deptt. of Animal Sci., Univ. Ankara, Turkey (in Turkish).

Sanderson JT. 2006. The steroid hormone biosynthesis pathway as a target for endocrine-disrupting chemicals. Toxicological Sciences 94(1): 3–21. Sogerescu E, Zamfirescu S, Anghel AH, Nadalu D, Rosoiu N. 2012.

Seasonal variations of progesterone level and characteristics of breeding season and anoestrus period and Carpathian goats. Journal of Animal and Veterinary Advances 11(9): 1472-1477.

Talebi J, Moghaddam A, Souri M, Mirmahmoudi R. 2012. Steroid hormone profile of Markhoz does (Iranian Angora) throughout estrous cycle and gestation period. Trop. Anim. Health Prod. 44: 355–360.

TSMS. 2011. Turkish State Meteorological Service, Ankara (Turkey).

Yilmaz B. 1999. Hormones and reproductive physiology. Feryal Press, Ankara, Turkey (in Turkish).

Zarazaga LA, Celi I, Guzmán JL, Malpaux B. 2010. Melatonin concentrations in the two jugular veins, and relationship with the seasonal reproductive activity in goats. Theriogenology 74: 221–228.