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24 ♂ lambs, born in Mar., were maintained under a natural photoperiod or under 8-h light:16-h darkness, or were implanted with melatonin. Blood concentrations of melatonin in the daytime averaged 19, 14 and 761 pg/ml for the 3 groups resp. in July, 14, 13 and 549 in Sep., and 13, 16 and 16 in Dec....

Mekonnen, G.; Boland, M. P.; Jordan, B.; Roche, J. F.
University College Dublin, Dublin, Irish Republic
11th International Congress on Animal Reproduction and Artificial Insemination, University College Dublin, Ireland, June 26-30 1988. Volume 2. Brief communications., 1988, Paper No. 47, pp 3pp.