[1] LEENHOUWERS J I,WISSINK P,VAN DER LENDE T,et al.Stillbirth in the pig in relation to genetic merit for farrowing survival[J].Journal of Animal Science,2003,81(10):2419-2424.
[2] RANDALL G C.Perinatal mortality:some problems of adaptation at birth[J].Advances in Veterinary Medicine,1978,22:53-81.
[3] RANDALL G C.Observations on parturition in the sow.Ⅰ.Factors associated with the delivery of the piglets and their subsequent behaviour[J].Veterinary Record,1972,90(7):178-182.

[4] RANDALL G C.Observations on parturition in the sow.Ⅱ.Factors influencing stillbirth and perinatal mortality[J].Veterinary Record,1972,90(7):183-186.

[5] SZCZUBIA? M,DABROWSKI R,BOCHNIARZ M,et al.The influence of the duration of the expulsive stage of parturition on the occurrence of postpartum oxidative stress in sows with uncomplicated,spontaneous farrowings[J].Theriogenology,2013,80(7):706-711.

[6] NRC.Energy[M]//Nutrient requirements of swine.Washington,D.C.:The National Academic Press,2012:9-10.
[7] NOBLET J,DOURMAD J Y,ETIENNE M.Energy utilization in pregnant and lactating sows:modeling of energy requirements[J].Journal of Animal Science,1990,68(2):562-572.
[8] HENRY Y,ETIENNNE M.Alimentation energetique du porc[J].Journees de la Rechereche Porcine en France,1978,10:119-166.
[9] ARC.The nutrient requirements of pigs[M].Slough:Commonwealth Agricultural Bureaux,1981.
[10] GATEL F,GASTAING J,LUCBERT J.Changes in productivity and culling rate according to pregnancy feed intake and litter parity[J].Livestock Production Science,1987,17:247-261.
[11] COWART R P.Parturition and dystocia in swine[M]//YOUNGQUIST R S,THRELFALL W R.Current therapy in:large animal theriogenology.2nd ed.St.Louis,Mo.:Saunders Elsevier,2007:778-784.
[12] 朱士恩.动物生殖生理学[M].北京:中国农业出版社,2006:210-215.
[13] OLIVIERO C.Successful farrowing in sows[D].Ph.D.Thesis.Helsinki:University of Helsinki,2010:13.
[14] MCCRACKEN J A,CUSTER E E,LAMSA J C.Luteolysis:a neuroendocrine-mediated event[J].Physiological Reviews,1999,79(2):263-323.
[15] RUSSELL J A,LENG G,DOUGLAS A J.The magnocellular oxytocin system,the fount of maternity:adaptations in pregnancy[J].Frontiers in Neuroendocrinology,2003,24(1):27-61.

[16] 石晓琳,吴德,周东胜,等.饲粮添加脂肪或淀粉对不同体重后备母猪初情启动的影响[J].中国畜牧杂志,2013,49(12):32-36.
[17] BILKEI P G.The effect of increased fibre content fed in the previous week on the parturition of sows[J].Magyar Állatorvosok Lapja,1990,45(10):597-601.

[18] MORGENTHUM R,BOLDUAN G.Effects of live weight and dietary factors of sows on length of parturition[J].Monatshefte für Veterinärmedizin,1988,43:194-196.
[19] OLIVIERO C,KOKKONEN T,HEINONEN M,et al.Feeding sows with high fibre diet around farrowing and early lactation:impact on intestinal activity,energy balance related parameters and litter performance[J].Research in Veterinary Science,2009,86(2):314-319.

[20] GUILLEMET R,HAMARD A,QUESNEL H,et al.Dietary fibre for gestating sows:effects on parturition progress,behaviour,litter and sow performance[J].Animal,2007,1(6):872-880.

[21] QUESNEL H,MEUNIER-SALAVN M,HAMARD A,et al.Dietary fiber for pregnant sows:influence on sow physiology and performance during lactation[J].Journal of Animal Science,2009,87(2):532-543.
[22] RUSHEN J,ROBERT S,FARMER C.Effects of an oat-based high-fibre diet on insulin,glucose,cortisol and free fatty acid concentrations in gilts[J].Animal Science,1999,69(2):395-401.
[23] REIMER R A,MCBURNEY M I.Dietary fiber modulates intestinal proglucagon messenger ribonucleic acid and postprandial secretion of glucagon-like peptide-1 and insulin in rats[J].Endocrinology,1996,137(9):3948-3956.
[24] BORIES P,VAUTRIN F,BOULOT S,et al.Analysis of physio-metabolic parameters in relation with long or complicated farrowings in the sow[J].Journées de la Recherche Porcine en France,2010,42:233-240.
[25] KALINOWSKI J,CHAVEZ E R.Effect of low dietary zinc during late gestation and early lactation on the sow and neonatal piglets[J].Canadian Journal of Animal Science,1984,64(3):749-758.

[26] KALINOWSKI J,CHAVEZ E R.Low dietary zinc intake during pregnancy and lactation of gilts.I.Effects on the dam[J].Canadian Journal of Animal Science,1986,66(1):201-216.

[27] APGAR J.Comparison of the effect of copper,manganese,and zinc deficiencies on parturition in the rat[J].American Journal of Physiology,1986,215(6):1478-1481.
[28] O'DELL B L,REYNOLDS G,REEVES P G.Analogous effects of zinc deficiency and aspirin toxicity in the pregnant rat[J].The Journal of Nutrition,1977,107(7):1222-1228.
[29] VALLET J L,REMPEL L A,MILES J R,et al.Effect of essential fatty acid and zinc supplementation during pregnancy on birth intervals,neonatal piglet brain myelination,stillbirth,and preweaning mortality[J].Journal of Animal Science,2014,92(6):2422-2432.

[30] CHAUCHEYRAS-DURAND F,DURAND H.Probiotics in animal nutrition and health[J].Beneficial Microbes,2010,1(1):3-9.

[31] JØRGENSEN J N,HANSEN C H.Probiotics for pigs-reliable solutions[J].International Pig Topics,2005,21:7-9.
[32] LE TREUT Y.Managing hyperprolific sows with live yeast[J].International Pig Topics,2007,22:11-13.
[33] LE TREUT Y,GRANNEC A,WALKER N.How farrowing impacts a sow's digestive transit[J].Pig Progress,2009,25(1):7-9.
[34] 蒋宗勇,高开国,杨雪芬,等.提高母猪年生产力的关键营养技术[J].动物营养学报,2014,26(10):3003-3010.