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POULTRY SCIENCE, 89(10), 2265–2272. https://doi.org/10.3382/ps.2010-00642 Siopes, T. D. (2010). Initiation of egg production by turkey breeder hens: Sexual maturation and age at lighting. POULTRY SCIENCE, 89(7), 1490–1496. https://doi.org/10.3382/ps.2009-00463 Siopes, T. D., & Underwood, H. A. (2008). Diurnal variation in the cellular and humoral immune responses of Japanese quail: Role of melatonin. GENERAL AND COMPARATIVE ENDOCRINOLOGY, 158(3), 245–249. https://doi.org/10.1016/j.ygcen.2008.07.008 Siopes, T. D., & Proudman, J. A. (2009). Exposure duration to long day lengths associated with the expression of photorefractoriness in turkey breeder hens. POULTRY SCIENCE, 88(1), 191–198. https://doi.org/10.3382/ps.2008-00264 Steinman, M. Q., Dinius, S. C., Siopes, T. D., & Millam, J. R. (2008). Photostimulated expression of type 2 iodothyronine deiodinase mRNA is greatly attenuated in the rostral tuberal Hypothalamus of the photorefractory turkey hen. Journal of Neuroendocrinology, 20(11), 1260–1269. https://doi.org/10.1111/j.1365-2826.2008.01781.x Siopes, T. D. (2007). Lighting for summer egg production by turkeys: day length and light intensity. POULTRY SCIENCE, 86(11), 2413–2419. https://doi.org/10.3382/ps.2007-00245 Proudman, J. A., & Siopes, T. D. (2006). Potential role of thyroid hormones and prolactin in the programming of photorefractoriness in turkey hens. POULTRY SCIENCE, 85(8), 1457–1461. https://doi.org/10.1093/ps/85.8.1457 Moore, C. B., & Siopes, T. D. (2005). Enhancement of cellular and humoral immunity following embryonic exposure to melatonin in turkeys (Meleagris gallopavo). GENERAL AND COMPARATIVE ENDOCRINOLOGY, 143(2), 178–183. https://doi.org/10.1016/j.ygcen.2005.03.008 Siopes, T. D. (2005). Spontaneous recovery of photosensitivity by turkey breeder hens given prolonged exposure to long day lengths. POULTRY SCIENCE, 84(9), 1470–1476. https://doi.org/10.1093/ps/84.9.1470 Proudman, J. A., & Siopes, T. D. (2005). Thyroid hormone and prolactin profiles in male and female turkeys following photostimulation. POULTRY SCIENCE, 84(6), 942–946. https://doi.org/10.1093/ps/84.6.942 Steele, C. T., Tosini, G., Siopes, T., & Underwood, H. (2006). Time keeping by the quail's eye: Cireadian regulation of melatonin production. GENERAL AND COMPARATIVE ENDOCRINOLOGY, 145(3), 232–236. https://doi.org/10.1016/j.ygcen.2005.09.004 Proudman, J. A., & Siopes, T. D. (2004). Effect of a single short-term reduction in photoperiod on photorefractoriness in turkey hens. POULTRY SCIENCE, 83(7), 1199–1202. https://doi.org/10.1093/ps/83.7.1199 Moore, C. B., & Siopes, T. D. (2004). Spontaneous ovarian adenocarcinoma in the domestic turkey breeder hen (Meleagris gallopavo): Effects of photoperiod and melatonin. Neuroendocrinology Letters, 25(02-Jan), 94–101. Moore, C. B., & Siopes, T. D. (2003). Immune function in turkey breeder hens during the short day prelighting period and renewal of photosensitivity for egg production. POULTRY SCIENCE, 82(1), 150–154. https://doi.org/10.1093/ps/82.1.150 Moore, C. B., & Siopes, T. D. (2003). Melatonin enhances cellular and humoral immune responses in the Japanese quail (Coturnix coturnix japonica) via an opiatergic mechanism. GENERAL AND COMPARATIVE ENDOCRINOLOGY, 131(3), 258–263. https://doi.org/10.1016/S0016-6480(03)00011-X Steele, C. T., Zivkovic, B. D., Siopes, T., & Underwood, H. (2003). Ocular clocks are tightly coupled and act as pacemakers in the circadian system of Japanese quail. AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY, 284(1), R208–R218. https://doi.org/10.1152/ajpregu.00447.2002 Siopes, T. D., & Proudman, J. A. (2003). Photoresponsiveness of turkey breeder hens changes during the egg-laying season: Relative and absolute photorefractoriness. POULTRY SCIENCE, 82(6), 1042–1048. https://doi.org/10.1093/ps/82.6.1042 Millam, JR, Craig-Veit, C. B., & Siopes, T. D. (2003). Photostimulated fos-like immunoreactivity in tuberal hypothalamus of photosensitive vs. photorefractory turkey hens. GENERAL AND COMPARATIVE ENDOCRINOLOGY, 134(2), 175–181. https://doi.org/10.1016/S0016-6480(03)00249-1 Millam, JR, Wang, R., Craig-Veit, C. B., & Siopes, T. D. (2002). Apposition of enkephalinergic axons with cGnRH I-containing perikarya in turkey hen brain. GENERAL AND COMPARATIVE ENDOCRINOLOGY, 127(2), 128–135. https://doi.org/10.1016/S0016-6480(02)00029-1 Siopes, T. D. (2002). Circulating thyroid hormone levels in recycled turkey breeder hens during a short day prelighting period and renewal of photosensitivity for egg production. POULTRY SCIENCE, 81(9), 1342–1346. https://doi.org/10.1093/ps/81.9.1342 Moore, C. B., & Siopes, T. D. (2002). Effect of melatonin supplementation on the ontogeny of immunity in the Large White turkey poult. POULTRY SCIENCE, 81(12), 1898–1903. https://doi.org/10.1093/ps/81.12.1898 Moore, C. B., & Siopes, T. D. (2002). Melatonin can produce immunoenhancement in Japanese quail (Coturnix coturnix japonica) without prior immunosuppression. GENERAL AND COMPARATIVE ENDOCRINOLOGY, 129(2), 122–126. https://doi.org/10.1016/S0016-6480(02)00516-6 Siopes, T. D. (2002). Photorefractoriness in turkey breeder hens is affected by age and season. POULTRY SCIENCE, 81(5), 689–694. https://doi.org/10.1093/ps/81.5.689 Moore, C. B., Siopes, T. D., Steele, C. T., & Underwood, H. (2002). Pineal melatonin secretion, but not ocular melatonin secretion, is sufficient to maintain normal immune responses in Japanese quail (Coturnix coturnix japonica). GENERAL AND COMPARATIVE ENDOCRINOLOGY, 126(3), 352–358. https://doi.org/10.1016/S0016-6480(02)00011-4 Proudman, J. A., & Siopes, T. D. (2002). Relative and absolute photorefractoriness in turkey hens: Profiles of prolactin, thyroxine, and triiodothyronine early in the reproductive cycle. POULTRY SCIENCE, 81(8), 1218–1223. https://doi.org/10.1093/ps/81.8.1218 Siopes, T. D. (2001). Temporal characteristics and incidence of photorefractoriness in turkey hens. POULTRY SCIENCE, 80(1), 95–100. https://doi.org/10.1093/ps/80.1.95 Zivkovic, B. D., Underwood, H., & Siopes, T. (2000). Circadian ovulatory rhythms in Japanese quail: Role of ocular and extraocular pacemakers. JOURNAL OF BIOLOGICAL RHYTHMS, 15(2), 172–183. https://doi.org/10.1177/074873040001500211 Moore, C. B., & Siopes, T. D. (2000). Effects of lighting conditions and melatonin supplementation on the cellular and humoral immune responses in Japanese quail Coturnix coturnix japonica. GENERAL AND COMPARATIVE ENDOCRINOLOGY, 119(1), 95–104. https://doi.org/10.1006/gcen.2000.7496 Grimes, J. L., & Siopes, T. D. (1999). [Review of A survey and overview of lighting practices in the US turkey breeder industry]. JOURNAL OF APPLIED POULTRY RESEARCH, 8(4), 493–498. https://doi.org/10.1093/japr/8.4.493 Siopes, T. D., & Neely, E. R. (1999). Ahemeral lighting of turkey breeder hens. 3. Temporary application and early age at lighting. POULTRY SCIENCE, 78(3), 387–391. https://doi.org/10.1093/ps/78.3.387 Knowlton, J. A., Siopes, T. D., Rhoads, M. L., & Kirby, J. D. (1999). Effects of transient treatment with 6-N-propyl-2-thiouracil on testis development and function in breeder turkeys. POULTRY SCIENCE, 78(7), 999–1005. https://doi.org/10.1093/ps/78.7.999 Siopes, T. D. (1999). Improved effectiveness of artificial insemination of turkey hens associated with ahemeral light-dark cycles and age at photostimulation. POULTRY SCIENCE, 78(6), 902–905. https://doi.org/10.1093/ps/78.6.902 Siopes, T. D. (1999). Intermittent lighting increases egg weight and facilitates early photostimulation of turkey breeder hens. POULTRY SCIENCE, 78(7), 1040–1043. https://doi.org/10.1093/ps/78.7.1040 Siopes, T. D. (1998). Absence of a seasonal effect on the critical day length for photorefractoriness in turkey breeder hens. POULTRY SCIENCE, 77(1), 145–149. https://doi.org/10.1093/ps/77.1.145 Siopes, T. D., & Neely, E. R. (1997). Ahemeral lighting of turkey breeder hens .1. Cycle length effects on egg production and egg characteristics. POULTRY SCIENCE, 76(5), 761–766. https://doi.org/10.1093/ps/76.5.761 Siopes, T. D., & Neely, E. R. (1997). Ahemeral lighting of turkey breeder hens. 2. Early age at lighting and reproductive performance. POULTRY SCIENCE, 76(12), 1783–1788. https://doi.org/10.1093/ps/76.12.1783 Underwood, H., Siopes, T., & Edmonds, K. (1997). Eye and gonad: Role in the dual-oscillator circadian system of female Japanese quail. AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY, 272(1), R172–R182. https://doi.org/10.1152/ajpregu.1997.272.1.r172 Siopes, T. (1997). Transient hypothyroidism reinitiates egg laying in turkey breeder hens: Termination of photorefractoriness by propylthiouracil. POULTRY SCIENCE, 76(12), 1776–1782. https://doi.org/10.1093/ps/76.12.1776 SIOPES, T. D. (1995). INCIDENCE OF PRELAY SQUATTING BEHAVIOR IS NOT RELATED TO SUBSEQUENT EGG-LAYING IN TURKEY BREEDER HENS. POULTRY SCIENCE, 74(6), 1039–1043. https://doi.org/10.3382/ps.0741039 SIOPES, T. D. (1995). TURKEY BREEDER HEN PERFORMANCE BY STRAIN DURING CONSECUTIVE LAY PERIODS. POULTRY SCIENCE, 74(8), 1269–1279. https://doi.org/10.3382/ps.0741269 SIOPES, T. D. (1994). CRITICAL DAY LENGTHS FOR EGG-PRODUCTION AND HOTOREFRACTORINESS IN THE DOMESTIC TURKEY. POULTRY SCIENCE, 73(12), 1906–1913. https://doi.org/10.3382/ps.0731906 SIOPES, T. D., BAUGHMAN, G. R., & PARKHURST, C. R. (1993). PHOTOPERIOD AND SEASONAL INFLUENCES ON THE GROWTH OF TURKEY HENS. BRITISH POULTRY SCIENCE, 34(1), 43–51. https://doi.org/10.1080/00071669308417561 SIOPES, T. D. (1992). EFFECT OF LIGHT-INTENSITY LEVEL DURING PRELAY LIGHT RESTRICTION ON SUBSEQUENT REPRODUCTIVE-PERFORMANCE OF TURKEY BREEDER HENS. POULTRY SCIENCE, 71(6), 939–944. https://doi.org/10.3382/ps.0710939 SIOPES, T. D. (1992). EFFECTS OF AGE AT LIGHTING ON REPRODUCTION OF TURKEY HENS. POULTRY SCIENCE, 71(12), 2099–2105. https://doi.org/10.3382/ps.0712099 SIOPES, T. D. (1991). LIGHT-INTENSITY EFFECTS ON REPRODUCTIVE-PERFORMANCE OF TURKEY BREEDER HENS. POULTRY SCIENCE, 70(10), 2049–2054. https://doi.org/10.3382/ps.0702049 SIOPES, T. D. (1991). LIGHT-INTENSITY FOR TURKEY BREEDER HENS - DEGREE OF DARKNESS REQUIRED DURING SHORT-DAY LIGHT RESTRICTION AND INTENSITY THRESHOLD DURING PHOTOSTIMULATION. POULTRY SCIENCE, 70(6), 1333–1338. https://doi.org/10.3382/ps.0701333 SIOPES, T. D., & PYRZAK, R. (1990). EFFECT OF INTERMITTENT LIGHTING ON THE REPRODUCTIVE-PERFORMANCE OF 1ST-YEAR AND RECYCLED TURKEY HENS. POULTRY SCIENCE, 69(1), 142–149. https://doi.org/10.3382/ps.0690142 SIOPES, T. D., & ELHALAWANI, M. E. (1989). PINEAL AND OCULAR INFLUENCES ON MALE AND FEMALE TURKEYS - PLASMA LUTEINIZING-HORMONE AND PROLACTIN LEVELS DURING GONADAL DEVELOPMENT. GENERAL AND COMPARATIVE ENDOCRINOLOGY, 73(2), 284–292. https://doi.org/10.1016/0016-6480(89)90101-9 SIOPES, T. D. (1989). PRELAY LIGHT RESTRICTION OF TURKEY HENS - DAYLENGTH VERSUS EXPOSURE TIME. POULTRY SCIENCE, 68(10), 1337–1341. https://doi.org/10.3382/ps.0681337 SIOPES, T. D., BAUGHMAN, G. R., PARKHURST, C. R., & TIMMONS, M. B. (1989). RELATIONSHIP BETWEEN DURATION AND INTENSITY OF ENVIRONMENTAL LIGHT ON THE GROWTH-PERFORMANCE OF MALE TURKEYS. POULTRY SCIENCE, 68(11), 1428–1435. https://doi.org/10.3382/ps.0681428 SIOPES, T. D., & ELHALAWANI, M. E. (1986). PLASMA PROLACTIN AND LUTEINIZING-HORMONE LEVELS OF PINEALECTOMIZED AND ENUCLEATED TURKEY HENS. GENERAL AND COMPARATIVE ENDOCRINOLOGY, 62(1), 36–42. https://doi.org/10.1016/0016-6480(86)90091-2 SIOPES, T. D. (1984). RECYCLING TURKEY HENS WITH LOW LIGHT-INTENSITY. POULTRY SCIENCE, Vol. 63, pp. 1449–1452. https://doi.org/10.3382/ps.0631449 SIOPES, T. D. (1984). THE EFFECT OF FULL-SPECTRUM FLUORESCENT LIGHTING ON REPRODUCTIVE TRAITS OF CAGED TURKEY HENS. POULTRY SCIENCE, 63(6), 1122–1128. https://doi.org/10.3382/ps.0631122 SIOPES, T. D. (1984). THE EFFECT OF HIGH AND LOW INTENSITY COOL-WHITE FLUORESCENT LIGHTING ON THE REPRODUCTIVE-PERFORMANCE OF TURKEY BREEDER HENS. POULTRY SCIENCE, 63(5), 920–926. https://doi.org/10.3382/ps.0630920 SIOPES, T. D., & BURKE, W. H. (1984). THE EFFECT OF OVARIECTOMY ON BROODINESS AND PLASMA PROLACTIN LEVELS IN TURKEY HENS DURING A PHOTOINDUCED REPRODUCTIVE-CYCLE. THERIOGENOLOGY, 22(4), 445–453. https://doi.org/10.1016/0093-691X(84)90465-5 SIOPES, T. D. (1983). EFFECT OF INTERMITTENT LIGHTING ON ENERGY SAVINGS AND SEMEN CHARACTERISTICS OF BREEDER TOM TURKEYS. POULTRY SCIENCE, 62(11), 2265–2270. https://doi.org/10.3382/ps.0622265 SIOPES, T. D. (1983). EFFECT OF PINEALECTOMY ON BROODINESS OF TURKEY HENS. POULTRY SCIENCE, 62(11), 2245–2248. https://doi.org/10.3382/ps.0622245 SIOPES, T. D. (1983). PERSISTENCY OF BROODINESS IN RECYCLED TURKEY HENS. THERIOGENOLOGY, 20(5), 565–569. https://doi.org/10.1016/0093-691X(83)90080-8 SIOPES, T. D., TIMMONS, M. B., BAUGHMAN, G. R., & PARKHURST, C. R. (1983). THE EFFECT OF LIGHT-INTENSITY ON THE GROWTH-PERFORMANCE OF MALE TURKEYS. POULTRY SCIENCE, 62(12), 2336–2342. https://doi.org/10.3382/ps.0622336