1D. Marois, J. R. Brisbane, J.-P. Laforest. Accounting for lactation length and weaning-to-conception interval in genetic evaluations for litter size in swine. J. Anim. Sci., 2000,78:1 796-1 810
2Variey M A,Coie D J.Studies in sow reproduction: 5. The effect of lactation length of the sow on the subsequent embryonic development. Anita Prod,1976,22(1):79-85
3Hays V W, J. L. Krug, G.L. Cromwell, et al, Effect of lactation length and dietary antibiotics on reproductive performance of sows. J. Anim. Sci., 1978,46:884-891
4Beistra BA, Diekman MA, Richert BT. Effects of lactation length and an exogenous progesterone and estradiol-17beta regimen during embryo attachment on endogenous steroid concentrations and embryo survival in sows. Theriogenology, 2002,57(8):2 063-2 081
5H. J. Willis, L. J. Zak, G. R. Foxcroft. Duration of lactation, endocrine and metabolic state, and fertility of primiparous sows. J. Anim. Sci., 2003,81:2 088-2 102
6Belstra B A, B.T. Richert, M.A. Diekman, et al. Effect of lactation length and exogenous progesterone/estradiol-17b on embryo survival in multiparous sows. J. Anim. Sci., 1999,77(2):48
7B.A. Beistra, M.A. Diekman, W.L. Singleton, et al. Effect of lactation length and steroid hormone treatment on embryonic survival and peripheral steroid concentrations in muitiparous sows. Swine Day Report,1999:7-13
8J.W. Frank, Belstra B A,D.C. Kendall, et al. Impact of lactation length and exogenous progesterone/estradiol on embryonic survival in third parity sows. Swine Day Report,1998:54-59
9Y. Koketsu, Gary D. Dial, Vickie L. King. Influence of Various Factors on Farrowing Rate on Farms Using Early Weaning. J. Anim.Sci., 1997,75(10):2 580-2 587
10Tantasuparuk W, Lundeheim, Dalin AM.Effects of lactation length and weaning-to-service interval on subsequent farrowing rate and litter size in Landrace and Yorkshire sows in Thailand. Theriogenology, 2000,54(9):1 525-1 536
