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The role of nutrition and photoperiod in the timing of puberty

Published online by Cambridge University Press:  28 February 2007

Clare L. Adam
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
John J. Robinson
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

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Type
Symposium on ‘Reproduction and fertility’
Copyright
Copyright © The Nutrition Society 1994

References

Adam, C. L., Kyle, C. E. & Young, P. (1992 a). Prenatal photoperiod influences timing of puberty in red deer. Journal of Reproduction and Fertility Abstract Series no. 9, Abstr. 5.Google Scholar
Adam, C. L., Kyle, C. E. & Young, P. (1992 b). Growth and reproductive development of red deer calves (Cervus elaphus) born out-of-season. Animal Production 55, 265270.Google Scholar
Adam, C. L., Kyle, C. E. & Young, P. (1992 c). Influence of prenatal photoperiod on postnatal prolactin secretion in red deer (Cervus elaphus). Journal of Reproduction and Fertility 95, 959964.CrossRefGoogle ScholarPubMed
Adam, C. L., Moir, C. E. & Shiach, P. (1989). Effect of melatonin on puberty in female red deer. Journal of Reproduction and Fertility Abstract Series no. 3, Abstr. 110.Google Scholar
Asher, G. W. (1990). Effect of subcutaneous melatonin implants on the seasonal attainment of puberty in female red deer (Cervus elaphus). Animal Reproduction Science 22, 145159.CrossRefGoogle Scholar
Bassett, J. M. (1992). Effects of additional lighting to provide a summer photoperiod for winter-housed pregnant ewes on plasma prolactin, udder development and lamb birthweight. Journal of Agricultural Science, Cambridge 119, 127136.CrossRefGoogle Scholar
Bassett, J. M., Curtis, N., Hanson, C. & Weeding, C. M. (1989). Effects of altered photoperiod or maternal melatonin administration on plasma prolactin concentrations in fetal lambs. Journal of Endocrinology 122, 633643.Google Scholar
Brango, C. W., Whisnant, C. S. & Goodman, R. L. (1990). A role for catecholaminergic neurons in suppression of pulsatile luteinizing hormone secretion in the prepubertal ewe lamb. Neuroendocrinology 52, 448454.Google Scholar
Bronson, F. H. & Manning, J. M. (1988). Food, energy expenditure and puberty in female rats. Proceedings of the 11th International Congress on Animal Reproduction and Artificial InseminationDublin, pp. 110–116.Google Scholar
Bucholtz, D. C., Suttie, J. M., Kostyo, J., Adel, T., Ebling, F. J. P. & Foster, D. L. (1990). Is growth hormone an important cue timing puberty in the female lamb? Biology of Reproduction 42, Suppl. 1, Abstr. 18.Google Scholar
Chandrasekhar, Y., D'Occhio, M. J., Holland, M. K. & Setchell, B. P. (1985). Activity of the hypothalamo-pituitary axis and testicular development in prepubertal ram lambs with induced hypothyroidism or hyperthyroidism. Endocrinology 117, 16451651.Google Scholar
Chandrasekhar, Y., D'Occhio, M. J. & Setchell, B. P. (1986). Delayed puberty caused by hyperthyroidism in ram lambs is not a result of suppression in body growth. Journal of Reproduction and Fertility 76, 763769.CrossRefGoogle Scholar
Claypool, L. E. & Foster, D. L. (1990). Sexual differentiation of the mechanism controlling pulsatile secretion of luteinizing hormone contributes to sexual differences in the timing of puberty in sheep. Endocrinology 126, 12061215.Google Scholar
Claypool, L. E., Wood, R. I., Yellon, S. M. & Foster, D. L. (1989). The ontogeny of melatonin secretion in the lamb. Endocrinology 124, 21352143.CrossRefGoogle ScholarPubMed
Copeland, K. C., Kuehl, T. J. & Castracane, V. D. (1982). Pubertal endocrinology of the baboon: Elevated somatomedin-C/insulin-like growth factor 1 at puberty. Journal of Clinical Endocrinology and Metabolism 55, 11981201.Google Scholar
Cosgrove, J. R., Booth, P. J. & Foxcroft, G. R. (1991). Opioidergic control of gonadotrophin secretion in the prepubertal gilt during restricted feeding and realimentation. Journal of Reproduction and Fertility 91, 277284.CrossRefGoogle ScholarPubMed
Deveson, S., Forsyth, I. A. & Arendt, J. (1992). Retardation of pubertal development by prenatal long days in goat kids born in autumn. Journal of Reproduction and Fertility 95, 629637.CrossRefGoogle ScholarPubMed
Dýrmundsson, Ó. R. (1987). Advancement of puberty in male and female sheep. In New Techniques in Sheep Production, pp. 6576 [Fayez, I., Marai, M. and Owen, J. B., editors]. London: Butterworths.CrossRefGoogle Scholar
Ebling, F. J. P., Claypool, L. E. & Foster, D. L. (1988). Neuroendocrine responsiveness to light during the neonatal period in the sheep. Journal of Endocrinology 119, 211218.Google Scholar
Ebling, F. J. P. & Foster, D. L. (1988). Photoperiod requirements for puberty differ from those for the onset of the adult breeding season in female sheep. Journal of Reproduction and Fertility 84, 283293.Google Scholar
Ebling, F. J. P., Kushler, R. H. & Foster, D. L. (1990 a). Pulsatile LH secretion during sexual maturation in the female sheep: photoperiodic regulation in the presence and absence of ovarian steroid feedback as determined in the same individual. Neuroendocrinology 52, 229237.Google Scholar
Ebling, F. J. P., Schwartz, M. L. & Foster, D. L. (1989 a). Endogenous opioid regulation of pulsatile luteinizing hormone secretion during sexual maturation in the female sheep. Endocrinology 125, 369383.CrossRefGoogle ScholarPubMed
Ebling, F. J. P., Wood, R. I., Karsch, F. J., Vannerson, L. A., Suttie, J. M., Bucholtz, D. C., Schall, R. E. & Foster, D. L. (1990 b). Metabolic interfaces between growth and reproduction. III. Central mechanisms controlling pulsatile luteinizing hormone secretion in the nutritionally growth-limited female lamb. Endocrinology 126, 27192727.Google Scholar
Ebling, F. J. P., Wood, R. I., Suttie, J. M., Adel, T. E. & Foster, D. L. (1989 b). Prenatal photoperiod influences neonatal prolactin secretion in the sheep. Endocrinology 125, 384391.Google Scholar
Fisher, M. W., Fennessy, P. F. & Johnstone, P. D. (1990). The timing of melatonin treatment affects the seasonal onset of ovarian activity, coat growth and live weight in young red deer hinds. Animal Reproduction Science 23, 4959.Google Scholar
Foster, D. L. (1981). Mechanism for delay of first ovulation in lambs born in the wrong season (fall). Biology of Reproduction 25, 8592.Google Scholar
Foster, D. L., Ebling, F. J. P., Claypool, L. E., Wood, R. I., Adel, T. E. & Schramm, W. (1989 a). Amplitude modulation of the nightly melatonin rise in the neonatal lamb and the subsequent timing of puberty. Biology of Reproduction 40, 920928.Google Scholar
Foster, D. L., Ebling, F. J. P., Micka, A. F., Vannerson, L. A., Bucholtz, D. C., Wood, R. I., Suttie, J. M. & Fenner, D. E. (1989 b). Metabolic interfaces between growth and reproduction. I. Nutritional modulation of gonadotropin, prolactin and growth hormone secretion in the growth-limited female lamb. Endocrinology 125, 342350.CrossRefGoogle ScholarPubMed
Foster, D. L., Ebling, F. J. P., Vannerson, L. A., Bucholtz, D. C., Wood, R. I. & Micka, A. F. (1988). Modulation of gonadotropin secretion during development by nutrition and growth. Proceedings of the 11th International Congress on Animal Reproduction and Artificial InseminationDublin, pp. 101–108.Google Scholar
Foster, D. L., Karsch, F. J., Olster, D. H., Ryan, K. D. & Yellon, S. M. (1986). Determinants of puberty in a seasonal breeder. Recent Progress in Hormone Research 42, 331378.Google Scholar
Foster, D. L. & Yellon, S. M. (1985). Photoperiodic time measurement is maintained in undernourished lambs with delayed puberty. Journal of Reproduction and Fertility 75, 203208.CrossRefGoogle ScholarPubMed
Foster, D. L., Yellon, S. M. & Olster, D. H. (1985). Internal and external determinants of the timing of puberty in the female. Journal of Reproduction and Fertility 75, 327344.Google Scholar
Hall, J. B., Schillo, K. K., Hileman, S. M. & Boling, J. A. (1992). Does tyrosine act as a nutritional signal mediating the effects of increased feed intake on luteinizing hormone patterns in growth-restricted lambs? Biology of Reproduction 46, 573579.Google Scholar
Hamilton, W. J. & Blaxter, K. L. (1980). Reproduction in farmed red deer. 1. Hind and stag fertility. Journal of Agricultural Science, Cambridge 95, 261273.Google Scholar
Handelsman, D. J., Spaliviero, J. A., Scott, C. D. & Baxter, R. C. (1987). Hormonal regulation of the peripubertal surge of insulin-like growth factor-1 in the rat. Endocrinology 120, 491496.CrossRefGoogle ScholarPubMed
Hassing, J. M., Kletter, G. B., I'Anson, H., Wood, R. I., Beitins, I. Z., Foster, D. L. & Padmanabhan, V. (1993). Pulsatile administration of gonadotropin-releasing hormone does not alter the follicle-stimulating hormone (FSH) isoform distribution pattern of pituitary or circulating FSH in nutritionally growth-restricted ovariectomized lambs. Endocrinology 132, 15271536.Google Scholar
Helliwell, R. J. A., Adam, C. L., Hannah, L. T., Kyle, C. E. & Williams, L. M. (1991). The distribution of central 2-[125I]-iodomelatonin binding sites in the adult and foetal deer. Journal of Reproduction and Fertility Abstract Series no. 8, Abstr. 117.Google Scholar
Helliwell, R. J. A., Wallace, J. M., Aitken, R. P. & Robinson, J. J. (1992). Prenatal photoperiod times the onset of puberty in ewe lambs. Journal of Reproduction and Fertility Abstract Series no. 10, Abstr. 71.Google Scholar
Helliwell, R. J. A. & Williams, L. M. (1991). The development of melatonin binding sites in the ovine foetus. Journal of Neuroendocrinology 52, Suppl. 1, 100.Google Scholar
Herbosa, C. G. & Foster, D. L. (1992). Prenatal photoperiod and the timing of puberty in the female lamb. Biology of Reproduction 46, Suppl. 1, 60 Abstr.Google Scholar
Hileman, S. M., Schillo, K. K., Estienne, M. J., Hall, J. B., Green, M. A. & Boling, J. A. (1990). Effects of short-term intracerebroventricular (IVC) administration of insulin (INS) on LH release in lambs during restricted and ad libitum feeding. Biology of Reproduction 42, Suppl. 1, 169 Abstr.Google Scholar
Hiney, J. K., Ojeda, S. R. & Dees, W. L. (1991). Insulin-like growth factor 1: a possible metabolic signal involved in the regulation of female puberty. Neuroendocrinology 54, 420423.Google Scholar
I'Anson, H., Foster, D. L., Foxcroft, G. R. & Booth, P. J. (1991). Nutrition and reproduction. In Oxford Reviews of Reproductive Biology, vol. 13, pp. 239311 [Milligan, S. R., editor]. London: Oxford University Press.Google Scholar
I'Anson, H., Herbosa, C. G., Ebling, F. J. P., Wood, R. I., Bucholtz, D. C., Mieher, C. D., Foster, D. L. & Padmanabhan, V. (1993). Hypothalamic versus pituitary stimulation of luteinizing hormone secretion in the prepubertal female lamb. Neuroendocrinology 57, 467475.Google Scholar
Jansen, H. T., Khalid, M. & Jackson, G. L. (1991). N-methyl-D,L-aspartate induces a transient increase in LH secretion in the seasonally anestrous ewe. Domestic Animal Endocrinology 8, 5562.Google Scholar
Keane, M. G. (1974). Effect of bodyweight on attainment of puberty and reproductive performance in Suffolk × ewe lambs. Irish Journal of Agricultural Research 13, 263274.Google Scholar
Kennaway, D. J., Peek, J. C., Gilmore, T. A. & Royles, P. (1986). Pituitary response to LHRH, LH pulsatility and plasma melatonin and prolactin changes in ewe lambs treated with melatonin implants to delay puberty. Journal of Reproduction and Fertility 78, 137148.CrossRefGoogle ScholarPubMed
Landefeld, T. D., Ebling, F. J. P., Suttie, J. M., Vannerson, L. A., Padmanabhan, V., Beitins, I. Z. & Foster, D. L. (1989). Metabolic interfaces between growth and reproduction. II. Characterization of changes in messenger ribonucleic acid concentrations of gonadotropin subunits, growth hormone and prolactin in nutritionally growth-limited lambs and the differential effects of increased nutrition. Endocrinology 125, 351356.Google Scholar
Lee, T. M., Smale, L., Zucker, I. & Dark, J. (1987). Influence of daylength experienced by dams on postnatal development of young meadow voles (Microtus pennsylvanicus). Journal of Reproduction and Fertility 81, 337342.Google Scholar
Lincoln, G. A., Ebling, F. J. P. & Martin, G. B. (1987). Endogenous opioid control of pulsatile LH secretion in rams: modulation by photoperiod and gonadal steroids. Journal of Endocrinology 115, 425438.CrossRefGoogle ScholarPubMed
Lincoln, G. A. & Wu, F. C. W. (1991) Luteinizing hormone responses to N-methyl-D,L-aspartate during a photoperiodically-induced reproductive cycle in the ram. Journal of Neuroendocrinology 3, 309317.Google Scholar
McShane, T. M. & Keisler, D. H. (1991). Effects of dietary energy on ovarian function, estrogen suppression of luteinizing hormone and follicle-stimulating hormone, and competency of the gonadotropin surge. Biology of Reproduction 45, 486492.Google Scholar
Malven, P. V. (1986). Inhibition of pituitary LH release resulting from endogenous opioid peptides. Domestic Animal Endocrinology 3, 135144.CrossRefGoogle Scholar
Meyer, S. L. & Goodman, R. L. (1986). Separate neural systems mediate the steroid-dependent and steroid-independent suppression of tonic luteinizing hormone secretion in the anoestrous ewe. Biology of Reproduction 35, 562571.CrossRefGoogle Scholar
Mondragon, A. M., Gaverick, H. A., Mollett, T. A. & Elmore, R. G. (1986). Effect of serotonin on LH secretion patterns in ovariectomized cows. Domestic Animal Endocrinology 3, 145152.Google Scholar
Moore, R. W., Bass, J. J., Winn, G. W. & Hockey, H.-U. P. (1985). Relationship between carcass composition and first oestrus in Romney ewe lambs. Journal of Reproduction and Fertility 74, 433438.CrossRefGoogle ScholarPubMed
Morgan, P. J., Barrett, P., Davidson, G. & Lawson, W. (1992). Melatonin regulates the synthesis and secretion of several proteins by pars tuberalis cells of the ovine pituitary. Journal of Neuroendocrinology 4, 557563.Google Scholar
Morgan, P. J., King, T. P., Lawson, W., Slater, D. & Davidson, G. (1991). Ultrastructure of melatonin responsive cells in the ovine pars tuberalis. Cell Tissue Research 263, 529534.Google Scholar
Morgan, P. J. & Williams, L. M. (1989). Central melatonin receptors: implications for a mode of action. Experientia 45, 955965.Google Scholar
Nicholls, T. J., Follet, B. K., Goldsmith, A. R. & Pearson, H. (1988). Possible homologies between photorefractoriness in sheep and birds: the effect of thyroidectomy on the length of the ewe's breeding season. Reproduction Nutrition Développement 28, 375385.Google Scholar
Nowak, R. & Rodway, R. G. (1985). Effect of intravaginal implants of melatonin on the onset of ovarian activity in adult and prepubertal ewes. Journal of Reproduction and Fertility 74, 287293.Google Scholar
Ogilvy, A. L. & Shalet, S. M. (1992). Growth hormone and puberty. Journal of Endocrinology 135, 405406.Google Scholar
Padmanabhan, V., Ebling, F. J. P., Sonstein, J., Fenner, D. E., Kelch, R. P., Foster, D. L. & Beitins, I. Z. (1989). Bioactive follicle-stimulating hormone release in nutritionally growth-retarded ovariectomized lambs: regulation by nutritional repletion. Endocrinology 125, 25172526.Google Scholar
Padmanabhan, V., Mieher, C. D., Borondy, M., I'Anson, H., Wood, R. I., Landefeld, T. D., Foster, D. L. & Bietins, I. Z. (1992). Circulating bioactive follicle-stimulating hormone and less acidic follicle-stimulating hormone isoforms increase during experimental induction of puberty in the female lamb. Endocrinology 131, 11311138.CrossRefGoogle ScholarPubMed
Paterson, A. M., Martin, G. B., Foldes, A., Maxwell, C. A. & Pearce, G. P. (1992). Concentrations of plasma melatonin and luteinizing hormone in domestic gilts reared under artificial long or short days. Journal of Reproduction and Fertility 94, 8595.Google Scholar
Rawlings, N. C. & Churchill, I. J. (1990). Effect of naloxone on gonadotrophin secretion at various stages of development in the ewe lamb. Journal of Reproduction and Fertility 89, 503509.Google Scholar
Recabarren, S. E., Zapata, P. & Parilo, J. (1990). Disappearance of opioidergic tone on LH secretion in underfed prepubertal sheep. Hormone and Metabolic Research 22, 225228.Google Scholar
Reiter, R. J. (1991). Pineal melatonin: cell biology of its synthesis and of its physiological interactions. Endocrine Reviews 12, 151180.Google Scholar
Reyes, A., Luckhaus, J. & Ferin, M. (1991). Unexpected inhibitory action of N-methyl-D.L-aspartate on luteinizing hormone release in adult ovariectomized rhesus monkeys: a role of the hypothalamic-adrenial axis. Endocrinology 127, 724729.Google Scholar
Robinson, J. J. (1990). Nutrition in the reproduction of farm animals. Nutrition Research Reviews 3, 253276.Google Scholar
Rodriguez, R. E., Benson, B., Dunn, A. M. & Wise, M. E. (1993). Age-related changes in biogenic amines, opiate, and steroid receptors in the prepubertal bull calf. Biology of Reproduction 48, 371376.CrossRefGoogle ScholarPubMed
Rodway, R. G., Swift, A. D., Nowak, R., Smith, J. A. & Padwick, D. (1985). Plasma concentrations of melatonin and the onset of puberty in female lambs. Animal Reproduction Science 8, 241246.CrossRefGoogle Scholar
Schillo, K. K., Hall, J. B. & Hileman, S. M. (1992). Effects of nutrition and season on the onset of puberty in the beef heifer. Journal of Animal Science 70, 39944005.Google Scholar
Schreihofer, D. A., Amico, J. A. & Cameron, J. L. (1993 a). Reversal of fasting-induced suppression of luteinizing hormone (LH) secretion in male rhesus monkeys by intragastric nutrient infusion: evidence for rapid stimulation of LH by nutritional signals. Endocrinology 132, 18901897.Google Scholar
Schreihofer, D. A., Parfitt, D. B. & Cameron, J. L. (1993 b). Suppression of luteinizing hormone secretion during short-term fasting in male rhesus monkeys: the role of metabolic versus stress signals. Endocrinology 132, 18811889.Google Scholar
Serrón-Ferré, M., Vergara, M., Parraguez, V. H., Riquelme, R. & Llanos, A. J. (1989). Fetal prolactin levels respond to a maternal melatonin implant. Endocrinology 125, 400403.Google Scholar
Shi, Z. D. & Barrell, G. K. (1992). Requirement of thyroid function for the expression of seasonal reproductive and related changes in red deer (Cervus elaphus) stags. Journal of Reproduction and Fertility 94, 251259.Google Scholar
Sisk, C. L. & Bronson, F. H. (1986). Effects of food restriction and restoration of gonadotropin and growth hormone secretion in immature male rats. Biology of Reproduction 35, 554561.CrossRefGoogle ScholarPubMed
Skinner, D. C., Goode, J. & Robinson, J. E. (1993). Does melatonin influence the luteinizing hormone releasing hormone (LHRH)-stimulated secretion of luteinizing hormone from the foetal ovine pars tuberalis (PT) and pars distalis (PD) in vitro? Journal of Reproduction and Fertility Abstract Series no. 11, Abstr. 28.Google Scholar
Steiner, R. A. (1987). Nutritional and metabolic factors in the regulation of reproductive hormone secretion in the primate. Proceedings of the Nutrition Society 46, 159175.CrossRefGoogle ScholarPubMed
Stetson, M. H., Elliott, J. A. & Goldman, B. D. (1986). Maternal transfer of photoperiodic information influences the photoperiodic response of prepubertal Djungarian hamsters (Phodopus sungorus sungorus). Biology of Reproduction 34, 664669.CrossRefGoogle ScholarPubMed
Sunderland, S. J., O'Callaghan, D., Boland, M. P. & Roche, J. F. (1990). The effect of pre- and postnatal photoperiod on the onset of puberty in ewe lambs. Journal of Reproduction and Fertility Abstract Series no. 6, Abstr. 42.Google Scholar
Suttie, J. M., Fennessy, P. F., Corson, I. D., Laas, F. J., Crosbie, S. F., Butler, J. H. & Gluckman, P. D. (1989). Pulsatile growth hormone, insulin-like growth factors and antler development in red deer (Cervus elaphus scoticus) stags. Journal of Endocrinology 121, 351360.Google Scholar
Suttie, J. M., Foster, D. L., Veenvliet, B. A., Manley, T. R. & Corson, I. D. (1991 a). Influence of food intake but independence of body weight on puberty in female sheep. Journal of Reproduction and Fertility 92, 3339.Google Scholar
Suttie, J. M., Kostyo, J. L., Ebling, F. J. P., Wood, R. I., Bucholtz, D. C., Skottner, A., Adel, T. E., Towns, R. J. & Foster, D. L. (1991 b). Metabolic interfaces between growth and reproduction. IV. Chronic pulsatile administration of growth hormone and the timing of puberty in the female sheep. Endocrinology 129, 20242032.Google Scholar
Suttie, J. M., White, R. G., Breier, B. H. & Gluckman, P. D. (1991 c). Photoperiod associated changes in insulin-like growth factor-1 in reindeer. Endocrinology 129, 679682.Google Scholar
Terasawa, E., Krook, C., Hei, D. L., Gearing, M., Schultz, N. J. & Davis, G. A. (1988). Norepinephrine is a possible neurotransmitter stimulating pulsatile release of luteinizing hormone releasing hormone in the rhesus monkey. Endocrinology 123, 18081816.CrossRefGoogle ScholarPubMed
Thiéry, J. C. & Martin, G. B. (1991). Neurophysiological control of the secretion of gonadotrophin-releasing hormone and luteinizing hormone in the sheep – a review. Reproduction, Fertility and Development 3, 137173.Google Scholar
Vriend, J., Sheppard, M. S. & Balo, R. M. (1988). Melatonin increases serum insulin-like growth factor-1 in male Syrian hamsters. Endocrinology 122, 25582561.Google Scholar
Webster, J. R. & Barrell, G. K. (1985). Advancement of reproductive activity, seasonal reduction in prolactin secretion and seasonal pelage changes in pubertal red deer hinds (Cervus elaphus) subjected to artificially shortened daily photoperiod or daily melatonin treatments. Journal of Reproduction and Fertility 73, 255260.Google Scholar
Webster, J. R., Moenter, S. M., Woodfill, C. J. I. & Karsch, F. J. (1991). Role of the thyroid gland in seasonal reproduction. II. Thyroxine allows a season-specific suppression of gonadotropin secretion in sheep. Endocrinology 129, 176183.Google Scholar
Wolfe, M. W., Robertson, M. S., Stumpf, T. T., Kittok, R. J. & Kinder, J. E. (1992). Modulation of luteinizing hormone and follicle-stimulating hormone in circulation by interactions between endogenous opioids and oestradiol during the peripubertal period of heifers. Journal of Reproduction and Fertility 96, 165174.Google Scholar
Wood, R. I., Ebling, F. J. P., I'Anson, H., Bucholtz, D. C., Yellon, S. M. & Foster, D. L. (1991 a). Prenatal androgens time neuroendocrine sexual maturation. Endocrinology 128, 24572468.CrossRefGoogle ScholarPubMed
Wood, R. I., Ebling, F. J. P., I'Anson, H. & Foster, D. L. (1991 b). The timing of neuroendocrine sexual maturity in the male lamb by photoperiod. Biology of Reproduction 45, 8288.CrossRefGoogle ScholarPubMed
Yellon, S. M. & Foster, D. L. (1985). Alternate photoperiods time puberty in the female lamb. Endocrinology 116, 20902097.Google Scholar
Yellon, S. M. & Foster, D. L. (1986). Melatonin rhythms time photoperiod induced puberty in the female lamb. Endocrinology 119, 4449.Google Scholar
Yellon, S. M. & Longo, L. D. (1987). Melatonin rhythms in fetal and maternal circulation during pregnancy in sheep. American Journal of Physiology 252, E799E802.Google Scholar
Yellon, S. M. & Longo, L. D. (1988). Effect of maternal pinealectomy and reverse photoperiod on the circadian melatonin rhythm in the sheep and fetus during the last trimester of pregnancy. Biology of Reproduction 39, 10931099.Google Scholar
Zemdegs, I. Z., McMillen, I. C., Walker, D. W., Thorburn, G. D. & Nowak, R. (1988). Diurnal rhythms in plasma melatonin concentrations in the fetal sheep and pregnant ewe during late gestation. Endocrinology 123, 284289.Google Scholar