| Steroid hormone production by pig blastocysts JS Perry, RB Heap, EC Amoroso Nature 245 (5419), 45-47, 1973 | 334 | 1973 |
| Concentrations of oestrogen and progesterone in the plasma of non-pregnant, pregnant and lactating guinea-pigs JRG Challis, RB Heap, DV ILLINGWORTH Journal of Endocrinology 51 (2), 333-345, 1971 | 270 | 1971 |
| Endocrinology of the blastocyst and its role in the establishment of pregnancy JS Perry, RB Heap, RD Burton, JE Gadsby Journal of reproduction and fertility. Supplement, 85-104, 1976 | 220 | 1976 |
| The role of oestrogens and progesterone in the onset of parturition in various species CA Bedford, JR Challis, FA Harrison, RB Heap Journal of reproduction and fertility. Supplement 16, 1-23, 1972 | 200 | 1972 |
| Pregnancy diagnosis in the cow from milk progesterone concentration RB Heap, RJ Holdsworth, JE Gadsby, JA Laing, DE Walters British Veterinary Journal 132 (5), 445-464, 1976 | 197 | 1976 |
| Oestrogen, progesterone and corticosteroid concentrations in peripheral plasma of sows during pregnancy, parturition, lactation and after weaning RW Ash, RB Heap Journal of endocrinology 64 (1), 141-154, 1975 | 195 | 1975 |
| Increase in milk secretion and mammary blood flow by intra-arterial infusion of insulin-like growth factor-I into the mammary gland of the goat CG Prosser, IR Fleet, AN Corps, ER Froesch, RB Heap Journal of Endocrinology 126 (3), 437-443, 1990 | 193 | 1990 |
| Pregnancy diagnosis in cows; changes in milk progesterone concentration during the oestrous cycle and pregnancy measured by a rapid radioimmunoassay RB Heap, M Gwyn, JA Laing, DE Walters The Journal of Agricultural Science 81 (1), 151-157, 1973 | 190 | 1973 |
| Oestrogen production by blastocyst and early embryonic tissue of various species JE Gadsby, RB Heap, RD Burton Reproduction 60 (2), 409-417, 1980 | 178 | 1980 |
| Polypeptide growth factors in uterine tissues and secretions DR Brigstock, RB Heap, KD Brown Reproduction 85 (2), 747-758, 1989 | 162 | 1989 |
| The concentration of progesterone in the milk of cows during the reproductive cycle. JA Laing, RB Heap | 145 | 1971 |
| A comparison of progesterone metabolism in the pregnant sheep and goat: sources of production and an estimation of uptake by some target organs JL Linzell, RB Heap Journal of Endocrinology 41 (3), 433-NP, 1968 | 126 | 1968 |
| Role of embryonic signals in the establishment of pregnancy RB Heap, AP Flint, JE Gadsby British Medical Bulletin 35 (2), 129-135, 1979 | 110 | 1979 |
| Progesterone in systemic blood and placentae of intact and ovariectomized pregnant guinea-pigs RB Heap, R Deanesly Journal of Endocrinology 34 (4), 417-423, 1966 | 104 | 1966 |
| Functional specialization in the ruminant placenta: evidence for two populations of fetal binucleate cells of different selective synthetic capacity FBP Wooding, G Morgan, S Monaghan, M Hamon, RB Heap Placenta 17 (1), 75-86, 1996 | 101 | 1996 |
| Studies on oestrogen synthesis by the preimplantation equine conceptus. RB Heap, M Hamon, WR Allen Journal of reproduction and fertility. Supplement 32, 343-352, 1982 | 101 | 1982 |
| Blastocyst oestrogen synthesis and the maternal recognition of pregnancy APF Flint, RD Burton, JE Gadsby, PTK Saunders, RB Heap Ciba Foundation Symposium 64‐Maternal Recognition of Pregnancy, 209-238, 1979 | 99 | 1979 |
| Oestrone sulphate in milk as an indicator of a viable conceptus in cows RB Heap, M Hamon British Veterinary Journal 135 (4), 355-363, 1979 | 93 | 1979 |
| Steroids and their interactions with phospholipids: solubility, distribution coefficient and effect on potassium permeability of liposomes RB Heap, AM Symons, JC Watkins Biochimica et Biophysica Acta (BBA)-Lipids and Lipid Metabolism 218 (3), 482-495, 1970 | 90 | 1970 |
| Control of binucleate cell migration in the placenta of sheep and goats FBP Wooding, APF Flint, RB Heap, G Morgan, HL Buttle, IR Young Reproduction 76 (2), 499-512, 1986 | 88 | 1986 |
