Adam, J. L. and Shearer, I. J. 1975. Effects on sow and litter performance of energy intake in lactation and feeding patterns after weaning. New Zealand journal of Experimental Agriculture 3: 55–62.
Aherne, F. X. and Kirkwood, R. N. 1985. Nutrition and sow prolificacy, journal of Reproduction and Fertility: suppl. 33, pp. 169–183.
Arbeiter, K., Onderscheka, K., Choi, H. S., Weber, E. and Jochle, W. 1974. Effect of megestrol acetate on milk production in sows and piglet growth. Theriogenology 2: 77–85.
Armstrong, J. D., Britt, J. H. and Kraeling, R. R. 1986. Effect of restriction of energy during lactation on body condition, energy metabolism, endocrine changes and reproductive performance in primiparous sows. Journal of Animal Science 63: 1915–1925
Brendemuhl, J. H., Lewis, A. J. and Peo, E. R. 1987. Effect of protein and energy intake by primiparous sows during lactation on sow and litter performance and sow serum thyroxine and urea concentrations. journal of Animal Science 64: 1060–1069.
Britt, J. H., Armstrong, J. D. and Cox, N. M. 1988. Metabolic interfaces between nutrition and reproduction in pigs. Proceedings of the eleventh congress on animal reproduction and artificial insemination, Dublin, pp. 117–126.
Britt, J. H. and Sesti, L. A. C. 1991. Maximizing fertility and fecundity in the sow. Revista Brasileira de Reproduccion Animal, suppl. 1, pp. 22–41.
Cole, D. J. A. 1990. Nutritional strategies to optimize reproduction in pigs. Journal of Reproduction and Fertility: suppl. 40, pp. 67–82.
Costa, A. N. and Varley, M. A. 1991. The influence of allyltrenbolone on the steroid hormone concentrations of multiparous sows in lactation and after weaning. Animal Production 52: 560–561.
Dyck, G. W. and Cole, D. J. A. 1986. The effect of restricted energy and nutrient intake after mating on reproductive performance of multiparous sows. Animal Production 42: 127–132.
Elsley, F. W. H., MacPherson, R. M. and McDonald, I. 1968. The influence of intake of dietary energy in pregnancy and lactation upon sow productivity. journal of Agricultural Science, Cambridge 71: 215–222.
Henry, R. W., Pickard, D. W. and Hughes, P. E. 1984. The effects of lactation length and food level on subsequent reproductive performance in the sow. Animal Production 38: 527 (abstr.).
Hitchcook, J. P., Sherrit, G. W., Gobble, J. L. and Hazlett, V. E. 1971. Effect of lactation feeding level of the sow on performance and subsequent reproduction. journal of Animal Science 33: 30–34.
Hughes, P. E., Henry, R. W. and Pickard, D. W. 1984. The effects of lactation food level on subsequent ovulation rate and early embryonic survival in the sow. Animal Production 38: 527 (abstr.).
I'Anson, H., Foster, D. L., Foxcroft, G. R. and Booth, P. J. 1991. Nutrition and reproduction. Oxford Reviezvs of Reproductive Biology 13: 239–311.
Jochle, W., Smidt, D., Holtz, W. and Spangenberg, B. 1975. Effects of feeding of a progestogen (chlormadinone acetate) to lactating sows on piglet growth and survival. Theriogenology 3: 130–132.
Johnston, L. J., Fogwell, R. L., Weldon, W. C., Ames, N. K., Ullrey, D. E. and Miller, E. R. 1989. Relationship between body fat and postweaning interval to estrus in primiparous sows. Journal of Animal Science 67: 943–950.
Johnston, L. J., Orr, D. E., Tribble, L. F. and Clark, J. R. 1986. Effect of lactation and rebreeding phase energy intake on primiparous and multiparous sow performance. Journal of Animal Science 63: 804–814.
King, R. H. and Williams, I. H. 1984a. The effect of nutrition on the reproductive performance of first-litter sows. 1. Feeding level during lactation, and between weaning and mating. Animal Production 38: 241–247.
King, R. H. and Williams, I. H. 1984b. The effect of nutrition on the reproductive performance of first-litter sows. 2. Protein and energy intakes during lactation. Animal Production 38: 249–256.
Kirkwood, R. N., Baidoo, S. K. and Aherne, F. X. 1990. The influence of feeding level during lactation and gestation on the endocrine status and reproductive performance of second parity sows. Canadian Journal of Animal Science 70: 1119–1126.
Kirkwood, R. N., Baidoo, S. K., Aherne, F. X. and Sather, A. P. 1987a. The influence of feeding level during lactation on the occurrence and endocrinology of the postweaning estrus in sows. Canadian Journal of Animal Science 67 405–415.
Kirkwood, R. N., Lythgoe, E. S. and Aherne, F. X. 1987b. Effect of lactation food intake and gonadotrophin-releasing hormone on the reproductive performance of sows. Canadian journal of Animal Science 67: 715–719.
Kirkwood, R. N., Smith, W. C. and Lapwood, K. R. 1986. Influence of oral administration of allyl trenbolone on subsequent litter size of primiparous sows. New Zealand Journal of Experimental Agriculture 14: 477–480.
Kirkwood, R. N. and Thacker, P. A. 1990. Failure of an induced ovulation during lactation to improve sows or litter performance. Canadian Journal of Animal Science 70: 135–138.
Lynch, P. B. 1989. Voluntary food intake of sows and gilts. In The voluntary food intake of pigs (ed. Forbes, J. M., Varley, M. A. and Lawrence, T. L. J.), occasional publication, British Society of Animal Production, no. 13, pp. 71–77.
Lythgoe, E. S. and Aherne, F. X. 1986. The effects of weight loss during lactation on reproductive performance in primiparous and multiparous sows. Part I. Feed intake, weight change and fat loss. Agriculture and Forestry bulletin, University of Alberta, special issue, pp. 114–116.
Moser, R. L. 1985. Lactation food intake management. Pigs: an international magazine on pig keeping 1:(3), 26–29.
Nelssen, J. L., Lewis, A. J., Peo, E. R. and Crenshaw, J. D. 1985. Effect of dietary energy intake during lactation on performance of primiparous sows and their litters. Journal of Animal Science 61: 1164–1171.
Pearce, G. P. 1985. Boar induced precocious puberty attainment in the gilt. Ph.D. thesis, University of Leeds.
Prime, G. R. 1988. The influence of level of food intake on progesterone concentrations and litter size in the pig. Ph.D. thesis, University of Leeds.
Reese, D. E., Moser, B. D., Peo, E. R., Lewis, A. J., Zimmermann, D. R., Kinder, J. E. and Stroup, W. W. 1982a. Influence of energy intake during lactation on the interval from weaning to first estrus in sows. Journal of Animal Science 55: 590–598.
Reese, D. E., Moser, B. D., Peo, E. R., Lewis, A. J., Zimmermann, D. R., Kinder, J. E. and Stroup, W. W. 1982b. Influence of energy intake during lactation on subsequent gestation, lactation and postweaning performance of sows. Journal of Animal Science 55: 867–872.
Reese, D. E., Peo, E. R. and Lewis, A. J. 1984. Relationship of lactation energy intake and occurrence of postweaning estrus to body and backfat composition in sows. Journal of Animal Science 58: 1236–1244.
Varley, M. A. and Cole, D. J. A. 1976. Studies in sow reproduction. 4. The effect of level of feeding in lactation and during the interval from weaning to remating on the subsequent reproductive performance of the early-weaned sow. Animal Production 22: 71–77.
Varley, M. A. and Foxcroft, G. R. 1990. Endocrinology of the lactating and weaned sow. Journal of Reproduction and Fertility: suppl. 40, pp. 47–61.
Varley, M. A., Peaker, R. E. and Atkinson, T. 1984. Effect of lactation length of the sow on plasma progesterone, oestradiol-17B and embryonic survival. Animal Production 38: 113–119.
Varley, M. A. and Prime, G. R. 1993. The effect of food intake on prolificacy and plasma progesterone concentrations in multiparous sows. Livestock Production Science 34: 267–279.
Yang, H., Varley, M. A. and Rodway, R. G. 1987. Effect of allyl-trenbolone on the attainment of puberty in gilts treated with oestradiol. Animal Production 45: 503–510.