Impacts of sow behaviour on reproductive performance: current understanding

References

• Algers B. 1993. Nursing in pigs: communicating needs and distributing resources. J Anim Sci. 71(10):2826–31.
   PubMed Web of Science ®Google Scholar
• Algers B, Uvnäs-Moberg K. 2007. Maternal behavior in pigs. Horm Behav. 52:78–85.
   PubMedGoogle Scholar
• Andersson A, Nismaa R, Huusko J, Jensen P. 2011. Behaviour of European wild boar (Sus scrofa) in connection with farrowing in an enclosure. Mamm Biol. 76:332–338.
   Web of Science ®Google Scholar
• Arey DS. 1999. Time course for the formation and disruption of social organisation in group-housed sows. Appl Anim Behav Sci. 62:199–207.
   Web of Science ®Google Scholar
• Averós X, Brossard L, Dourmad JY, de Greef KH, Edge HL, Edwards SA, Meunier-Salaün MC. 2010. Quantitative assessment of the effects of space allowance, group size and floor characteristics on the lying behaviour of growing-finishing pigs. Animal. 4:777–783.
   PubMed Web of Science ®Google Scholar
• Barb CR, Hausman GJ, Lents CA. 2008. Energy metabolism and leptin: effects on neuroendocrine regulation of reproduction in the gilt and sow. Reprod Domest Anim. 43(Suppl 2):324–330.
   PubMedGoogle Scholar
• Bates RO, Edwards DB, Korthals RL. 2003. Sow performance when housed either in groups with electronic sow feeders or stalls. Livest Prod Sci. 79:29–35.
   Google Scholar
• Baxter EM, Adeleye OO, Jack MC, Farish M, Edwards SA. 2015. Achieving optimum performance in a loose-housed farrowing system for sows: The effects of space and temperature. Appl Anim Behav Sci. 169:9–16.
   Web of Science ®Google Scholar
• Baxter EM, Jarvis S, Sherwood L, Robson SK, Ormandy E, Farish M, Smurthwaite KM, Roehe R, Lawrence AB, Edwards SA. 2009. Indicators of piglet survival in an outdoor farrowing system. Livest Sci. 124:266–276.
   Web of Science ®Google Scholar
• Baxter EM, Rutherford KM, D’Eath RB, Turner SP, Jarvis S.. 2013. The welfare implications of large litter size in the domestic pig II: management factors. Animal Welfare. 2:22–26.
   Google Scholar
• Borell EV, Dobson H, Prunier A. 2007. Stress, behaviour and reproductive performance in female cattle and pigs. Hormones & Behavior. 52:130–138.
   PubMed Web of Science ®Google Scholar
• Brand H, Schouten W, Kemp B. 2004. Maternal feed intake, but not feed composition affects postural behaviour and nursing frequency of lactating primiparous sows. Appl Anim Behav Sci. 86:41–49.
   Web of Science ®Google Scholar
• Bunter KL, Lewis CR, Newman S. 2015. Social genetic effects influence reproductive performance of group-housed sows. J Anim Sci. 93:3783–3793.
   PubMed Web of Science ®Google Scholar
• Burri M, Wechsler B, Gygax L, Weber R. 2009. Influence of straw length, sow behaviour and room temperature on the incidence of dangerous situations for piglets in a loose farrowing system. Appl Anim Behav Sci. 117:181–189.
   Web of Science ®Google Scholar
• Castrén H, Algers B, Jensen P. 1989. Occurrence of unsuccessful sucklings in newborn piglets in a semi-natural environment. Appl Anim Behav Sci. 23:61–73.
   Web of Science ®Google Scholar
• Castrén H, Algers B, Passillé A-M, Rushen J, Uvnäs-Moberg K. 1993. Preparturient variation in progesterone, prolactin, oxytocin and somatostatin in relation to nest building in sows. Appl Anim Behav Sci. 38:91–102.
   Web of Science ®Google Scholar
• Chaloupková H, Illmann G, Neuhauserová K, Simecková M, Kratinová P. 2011a. The effect of nesting material on the nest-building and maternal behavior of domestic sows and piglet production. J Anim Sci. 89:531–537.
   PubMed Web of Science ®Google Scholar
• Chaloupková H, Illmann G, Neuhauserová K, Simecková M, Kratinová P. 2011b. The effect of nesting material on the nest-building and maternal behavior of domestic sows and piglet production. J Anim Sci. 89:531–537.
   PubMed Web of Science ®Google Scholar
• Chaloupková H, Illmann G, Pedersen LJ, Malmkvist J, Šimečková M. 2008. Sow responsiveness to human contacts and piglet vocalization during 24 h after onset of parturition. Appl Anim Behav Sci. 112:260–269.
   Web of Science ®Google Scholar
• Crenshaw JD, Park CS, Swantek PM, Keller WL, Zimprich RC. 1989. Growth, reproduction and lactation response of gilts to a phased feeding regimen designed to induce compensatory growth. J Anim Sci. 67:107–108.
   Google Scholar
• Cronin GM, Wiepkema PR. 1984. An analysis of stereotyped behaviour in tethered sows. Ann Rech Vet. 15:263–270.
   PubMedGoogle Scholar
• Damm BI, Lisborg L, Vestergaard KS, Vanicek J. 2003. Nest-building, behavioural disturbances and heart rate in farrowing sows kept in crates and Schmid pens. Livest Prod Sci. 80:175–187.
   Google Scholar
• Damm BI, Vestergaard KS, Schrøder-Petersen DL, Ladewig J. 2000. The effects of branches on prepartum nest building in gilts with access to straw. Appl Anim Behav Sci. 69:113–124.
   PubMed Web of Science ®Google Scholar
• Danielsen M, Thymann T, Jensen BB, Jensen ON, Sangild PT, Bendixen E. 2006. Proteome profiles of mucosal immunoglobulin uptake in inflamed porcine gut. Proteomics. 6:6588–6596.
   PubMed Web of Science ®Google Scholar
• DeDecker AE, Hanson AR, Walker PM, Salak-Johnson JL. 2014. Space allowance and high fiber diet impact performance and behavior of group-kept gestating sows. J Anim Sci. 92:1666–1674.
   PubMed Web of Science ®Google Scholar
• Einarsson S, Sjunnesson Y, Hultén F, Eliasson-Selling L, Dalin AM, Lundeheim N, Magnusson U. 2014. A 25 years experience of group-housed sows-reproduction in animal welfare-friendly systems. Acta Vet Scand. 56:37–45.
   PubMed Web of Science ®Google Scholar
• English PR, Smith WJ. 1995. Some causes of death in neonatal piglets. J Anim Sci. 15–22.
   Google Scholar
• Farmer C. 2019. Review: mammary development in lactating sows: the importance of suckling. Animal. 13:s20–s25.
   PubMed Web of Science ®Google Scholar
• Ferket SL, Hacker RR. 1985. Effect of forced exercise during gestation on reproductive performance of sows [microform]. Can J Anim Sci. 65:851–859.
   Web of Science ®Google Scholar
• Fraser D. 1980. A review of the behavioural mechanism of milk ejection of the domestic pig. Appl Anim Ethol. 6:247–255.
   Web of Science ®Google Scholar
• Grandinson K, Rydhmer L, Strandberg E, Thodberg K. 2003. Genetic analysis of on-farm tests of maternal behaviour in sows. Livest Prod Sci. 83:141–151.
   Google Scholar
• Herskin MS, Jensen KH, Thodberg K. 2016. Influence of environmental stimuli on nursing and suckling behaviour in domestic sows and piglets. Anim Sci. 68:27–34.
   Google Scholar
• Holyoake PK, Dial GD, Trigg T, King VL. 1995. Reducing pig mortality through supervision during the perinatal period. J Anim Sci. 73:3543–3551.
   PubMed Web of Science ®Google Scholar
• Huang S, Wei J, Yu H, Hao X, Zuo J, Tan C, Deng J. 2020. Effects of dietary fiber sources during gestation on stress status, abnormal behaviors and reproductive performance of sows. Animals (Basel). 10(1):141–147.
   PubMedGoogle Scholar
• Hultén F, Wallenbeck A, Rydhmer L. 2006. Ovarian activity and oestrous signs among group-housed, lactating sows: influence of behaviour, environment and production. Reprod Domest Anim. 41:448–454.
   PubMed Web of Science ®Google Scholar
• Hutson GD, Price EO, Dickenson LG. 1993. The effect of playback volume and duration on the response of sows to piglet distress calls. Appl Anim Behav Sci. 37:31–37.
   Web of Science ®Google Scholar
• Illmann G, Chaloupková H, Melišová M. 2016. Impact of sow prepartum behavior on maternal behavior, piglet body weight gain, and mortality in farrowing pens and crates. J Anim Sci. 94:3978–3986.
   PubMed Web of Science ®Google Scholar
• Illmann G, Madlfousek J. 1995. Occurrence and characteristics of unsuccessful nursings in minipigs during the first week of life. Appl Anim Behav Sci. 44:9–18.
   Web of Science ®Google Scholar
• Illmann G, Neuhauserová K, Pokorná Z, Chaloupková H, Šimečková M. 2008. Maternal responsiveness of sows towards piglet’s screams during the first 24 h postpartum. Appl Anim Behav Sci. 112:248–259.
   Web of Science ®Google Scholar
• Jarrett S, Ashworth CJ. 2018. The role of dietary fibre in pig production, with a particular emphasis on reproduction. J Anim Sci Biotechnol. 6(9):59–67.
   Google Scholar
• Jensen P. 1986. Observations on the maternal behaviour of free-ranging domestic pigs. Applanimbehav. 16:131–142.
   Google Scholar
• Johnsen JF, de Passille AM, Mejdell CM, Bøe KE, Grøndahl AM, Beaver A, Rushen J, Weary DM. 2015. The effect of nursing on the cow–calf bond. Appl Anim Behav Sci. 163:50–57.
   Web of Science ®Google Scholar
• Kecman J, Waehner M. 2016. Management of large litters in piglet production. Tierarztliche Praxis. Ausgabe G GroBtiere. 44:318–325.
   PubMed Web of Science ®Google Scholar
• Kemp B, Soede NM. 2012. Reproductive issues in welfare-friendly housing systems in pig husbandry: a review. Reprod Domest Anim. 47(Suppl 5):51–57.
   PubMedGoogle Scholar
• Kemp B, Soede NM, Langendijk P. 2005. Effects of boar contact and housing conditions on estrus expression in sows. Theriogenology. 63:643–656.
   PubMed Web of Science ®Google Scholar
• Kielland C, Rootwelt V, Reksen O, Framstad T. 2015. The association between immunoglobulin G in sow colostrum and piglet plasma. J Anim Sci. 93:4453–4462.
   PubMed Web of Science ®Google Scholar
• Kilbride AL, Mendl M, Statham P, Held S, Harris M, Cooper S, Green LE. 2012. A cohort study of preweaning piglet mortality and farrowing accommodation on 112 commercial pig farms in England. Prev Vet Med. 104:281–291.
   PubMed Web of Science ®Google Scholar
• Kim SW, Weaver AC, Shen YB, Zhao Y. 2013. Improving efficiency of sow productivity: nutrition and health. J Anim Sci Biotechnol. 4:8–26.
   PubMed Web of Science ®Google Scholar
• Kirkden RD, Broom DM, Andersen IL. 2013. Invited review: piglet mortality: management solutions. J Anim Sci. 91:3361–3389.
   PubMed Web of Science ®Google Scholar
• Kobek-Kjeldager C, Moustsen VA, Theil PK, Pedersen LJ. 2020. Effect of litter size, milk replacer and housing on production results of hyper-prolific sows. Animal. 14:824–833.
   PubMed Web of Science ®Google Scholar
• Koketsu Y, Dial GD. 1997. Factors associated with prolonged weaning-to-mating interval among sows on farms that wean pigs early. J Am Vet Med Assoc. 211:894–898.
   PubMed Web of Science ®Google Scholar
• Koketsu Y, Iida R. 2017. Sow housing associated with reproductive performance in breeding herds. Mol Reprod Dev. 84:979–986.
   PubMed Web of Science ®Google Scholar
• Kratinová I. 2008. Carefulness and flexibility of lying down behaviour in sows during 24 h post-partum in relation to piglet position. Appl Anim Behav Sci. 114:346–358.
   Web of Science ®Google Scholar
• Lambertz C, Petig M, Elkmann A, Gauly M. 2015. Confinement of sows for different periods during lactation: effects on behaviour and lesions of sows and performance of piglets. Animal. 9:1373–1378.
   PubMed Web of Science ®Google Scholar
• Langendijk P, Plush K. 2019. Parturition and its relationship with stillbirths and asphyxiated piglets. Animals (Basel). 9:885–891.
   PubMedGoogle Scholar
• Lawrence B, Petherick C, Lean M, Deans A, Chirnside J, Gaughan A, Clutton E, Terlouw EMC. 1994. The effect of environment on behaviour, plasma cortisol and prolactin in parturient sows. Appl Anim Behav Sci. 39:313–330.
   Web of Science ®Google Scholar
• Li H, Yin J, Tan B, Chen J, Zhang H, Li Z, Ma X. 2021. Physiological function and application of dietary fiber in pig nutrition: A review. Anim Nutr. 7:259–267.
   PubMedGoogle Scholar
• Liu X, Song P, Yan H, Zhang L, Wang L, Zhao F, Gao H, Hou X, Shi L, Li B, et al. 2021. A comparison of the behavior, physiology, and offspring resilience of gestating sows when raised in a group housing system and individual stalls. Animals (Basel). 11:2076–2081.
   PubMedGoogle Scholar
• Loisel F, Farmer C, Ramaekers P, Quesnel H. 2013. Effects of high fiber intake during late pregnancy on sow physiology, colostrum production, and piglet performance. J Anim Sci. 91:5269–5279.
   PubMed Web of Science ®Google Scholar
• Macias H, Hinck L. 2012. Mammary gland development. Wiley Interdiscip Rev Dev Biol. 1:533–557.
   PubMed Web of Science ®Google Scholar
• Maes D, Pluym L, Peltoniemi O. 2016. Impact of group housing of pregnant sows on health. Porcine Health Manag. 2:17–22.
   PubMed Web of Science ®Google Scholar
• Malmkvist J, Pedersen L, Kammersgaard T EJ. 2012. Influence of thermal environment on sows around farrowing and during the lactation period. J Anim Sci. 90:3186–3199.
   PubMed Web of Science ®Google Scholar
• Marchant JN, Rudd AR, Mendl MT, Broom DM, Meredith MJ, Corning S, Simmins PH. 2000a. Timing and causes of piglet mortality in alternative and conventional farrowing systems. Vet Rec. 147:209–214.
   PubMed Web of Science ®Google Scholar
• Marchant JN, Rudd AR, Mendl MT, Broom DM, Meredith MJ, Corning S, Simmins PH. 2000b. Timing and causes of piglet mortality in alternative and conventional farrowing systems. Vet Rec. 147:209–214.
   PubMed Web of Science ®Google Scholar
• Martineau GP, Smith BB, Doizé B. 1992. Pathogenesis, prevention, and treatment of lactational insufficiency in sows. Vet Clin North Am Food Anim Pract. 8:661–684.
   PubMed Web of Science ®Google Scholar
• McPherson RL, Ji F, Wu G, Blanton JR Jr., Kim SW. 2004. Growth and compositional changes of fetal tissues in pigs. J Anim Sci. 82:2534–2540.
   PubMed Web of Science ®Google Scholar
• Melišová M, Illmann G, Andersen IL, Vasdal G, Haman J. 2011. Can sow pre-lying communication or good piglet condition prevent piglets from getting crushed? Appl Anim Behav Sci. 134:121–129.
   Web of Science ®Google Scholar
• Melišová M, Illmann G, Chaloupková H, Bozděchová B. 2014. Sow postural changes, responsiveness to piglet screams, and their impact on piglet mortality in pens and crates. J Anim Sci. 92:3064–3072.
   PubMed Web of Science ®Google Scholar
• Mellor DJ, Lentle RG. 2015. Survival implications of the development of behavioural responsiveness and awareness in different groups of mammalian young. N Z Vet J. 63:131–140.
   PubMed Web of Science ®Google Scholar
• Morgan L, Klement E, Novak S, Eliahoo E, Younis A, Sutton GA, Abu-Ahmad W, Raz T. 2018. Effects of group housing on reproductive performance, lameness, injuries and saliva cortisol in gestating sows. Prev Vet Med. 160:10–17.
   PubMed Web of Science ®Google Scholar
• Mudd AT, Alexander LS, Johnson SK, Getty CM, Malysheva OV, Caudill MA, Dilger RN. 2016. Perinatal dietary choline deficiency in sows influences concentrations of choline metabolites, fatty acids, and amino acids in milk throughout lactation. J Nutr. 146:2216–2223.
   PubMed Web of Science ®Google Scholar
• Munsterhjelm C, Valros A, Heinonen M, Hlli O, Peltoniemi O. 2008. Housing during early pregnancy affects fertility and behaviour of sows. Reprod Domest Anim. 43:584–591.
   PubMed Web of Science ®Google Scholar
• Nicolaisen T, Lühken E, Volkmann N, Rohn K, Kemper N, Fels M. 2019. The effect of sows’ and piglets’ behaviour on piglet crushing patterns in Two different farrowing Pen systems. Animals (Basel). 9(8):538–542.
   PubMedGoogle Scholar
• Ocepek M, Andersen IL. 2017. What makes a good mother? Maternal behavioural traits important for piglet survival. Appl Anim Behav Sci. 193:29–36.
   Web of Science ®Google Scholar
• Ocepek M, Andersen IL. 2018. Sow communication with piglets while being active is a good predictor of maternal skills, piglet survival and litter quality in three different breeds of domestic pigs (Sus scrofa domesticus). PLoS One. 13:e0206128.
   PubMed Web of Science ®Google Scholar
• Ocepek M, Rosvold EM, Andersen-Ranberg I, Andersen IL. 2017. Can we improve maternal care in sows? maternal behavioral traits important for piglet survival in loose-housed sow herds. J Anim Sci. 95:4708–4717.
   PubMed Web of Science ®Google Scholar
• Oliviero C, Heinonen M, Valros A, Hälli O, Peltoniemi OA. 2008. Effect of the environment on the physiology of the sow during late pregnancy, farrowing and early lactation. Anim Reprod Sci. 105:365–377.
   PubMed Web of Science ®Google Scholar
• Oliviero C, Heinonen M, Valros A, Peltoniemi O. 2010. Environmental and sow-related factors affecting the duration of farrowing. Anim Reprod Sci. 119:85–91.
   PubMed Web of Science ®Google Scholar
• Oliviero C, Peltoniemi O. 2020. Troubled Process of Parturition of the Domestic Pig. 12:35–46.
   Google Scholar
• Pandolfi F, Edwards SA, Robert F, Kyriazakis I. 2017. Risk factors associated with the different categories of piglet perinatal mortality in French farms. Prev Vet Med. 137:1–12.
   PubMed Web of Science ®Google Scholar
• Pedersen LJ, Damm BI, Marchant-For De JN, Jensen KH. 2003. Effects of feed-back from the nest on maternal responsiveness and postural changes in primiparous sows during the first 24 h after farrowing onset. Appl Anim Behav Sci. 83:109–124.
   Web of Science ®Google Scholar
• Peltoniemi O, Björkman S, Maes D. 2016. Reproduction of group-housed sows. Porcine Health Manag. 2:15–26.
   PubMedGoogle Scholar
• Peltoniemi O, Han T, Yun J. 2021. Coping with large litters: management effects on welfare and nursing capacity of the sow. J Anim Sci Technol. 63:199–210.
   PubMed Web of Science ®Google Scholar
• Plush KJ, McKenny LA, Nowland TL, van Wettere W. 2021. The effect of hessian and straw as nesting materials on sow behaviour and piglet survival and growth to weaning. Animal. 15:100273–100277.
   PubMed Web of Science ®Google Scholar
• Pluym LM, Van Nuffel A, Van Weyenberg S, Maes D. 2013. Prevalence of lameness and claw lesions during different stages in the reproductive cycle of sows and the impact on reproduction results. Animal. 7:1174–1181.
   PubMed Web of Science ®Google Scholar
• Portele K, Scheck K, Siegmann S, Feitsch R, Maschat K, Rault JL, Camerlink I. 2019. Sow-piglet nose contacts in free-farrowing pens. Animals Basel. 9(8):513–518.
   PubMed Web of Science ®Google Scholar
• Quesnel H, Farmer C. 2019. Review: nutritional and endocrine control of colostrogenesis in swine. Animal. 13:s26–s34.
   PubMed Web of Science ®Google Scholar
• Rault JL, Morrison RS, Hansen CF, Hansen LU, Hemsworth PH. 2014. Effects of group housing after weaning on sow welfare and sexual behavior. J Anim Sci. 92:5683–5692.
   PubMed Web of Science ®Google Scholar
• Rutherford KM, Berg L, Roehe AB, Arnott E, Sandoe AS. 2013. The welfare implications of large litter size in the domestic pig I: biological factors. Universities Federation for Animal Welfare. 2:15–19.
   Google Scholar
• Sánchez C, Franco L, Regal P, Lamas A, Cepeda A, Fente C. 2021. Breast milk: a source of functional compounds with potential application in nutrition and therapy. Nutrients. 13:1026–1034.
   PubMed Web of Science ®Google Scholar
• Spicer EM, Driesen SJ, Fahy VA, Horton BJ, Sims LD, Jones RT, Cutler RS, Prime RW. 1986. Causes of preweaning mortality on a large intensive piggery. Aust Vet J. 63:71–75.
   PubMed Web of Science ®Google Scholar
• Spoolder H, Geudeke MJ, Peet-Schwering C, Soede NM. 2009. Group housing of sows in early pregnancy: a review of success and risk factors. Livest Sci. 125:1–14.
   Web of Science ®Google Scholar
• Spoolder HAM, Vermeer HM. 2015. Gestation group housing of sows: the gestating and lactating sow. 3:78–92.
   Google Scholar
• Steen AH, Schaeffer LR, Jong H, Groot PN. 1988. Aggressive behaviour of sows at parturition. Journal of Animal Ence. 66:271–279.
   PubMed Web of Science ®Google Scholar
• Sun HQ, Tan CQ, Wei HK, Zou Y, Long G, Ao JT, Xue HX, Jiang SW, Peng J. 2015. Effects of different amounts of konjac flour inclusion in gestation diets on physio-chemical properties of diets, postprandial satiety in pregnant sows, lactation feed intake of sows and piglet performance. Anim Reprod Sci. 152:55–64.
   PubMed Web of Science ®Google Scholar
• Tanaka Y, Koketsu Y. 2007. A field study of the associations between behaviors and reproductive performance in lactating sows. J Vet Med Sci. 69:1229–1233.
   PubMed Web of Science ®Google Scholar
• Theil PK, Farmer C, Feyera T. 2022. Review: physiology and nutrition of late gestating and transition sows. J Anim Sci. 100(6):176–182.
   Web of Science ®Google Scholar
• Thodberg K, Jensen KH, Herskin MS. 2002. Nursing behaviour, postpartum activity and reactivity in sows: effects of farrowing environment, previous experience and temperament. Appl Anim Behav Sci. 77:53–76.
   Web of Science ®Google Scholar
• Tokach MD, Menegat MB, Gourley KM, Goodband RD. 2019. Review: nutrient requirements of the modern high-producing lactating sow, with an emphasis on amino acid requirements. Animal. 13:2967–2977.
   PubMed Web of Science ®Google Scholar
• Trine F, Pedersen T, Sønderby B, Takele F, Uffe K. 2016. A two-diet feeding regime for lactating sows reduced nutrient deficiency in early lactation and improved milk yield. Livest Sci. 191:165–173.
   Web of Science ®Google Scholar
• Tsuma VT, Einarsson S, Madej A, Kindahl H, Lundeheim N. 1996. Effect of food deprivation during early pregnancy on endocrine changes in primiparous sows. Anim Reprod Sci. 41:267–278.
   Web of Science ®Google Scholar
• Tuchscherer M, Manteuffel G. 2000. The effect of psycho stress on the immune system. Another Reason for Pursuing Animal Welfare (Review). Archiv fur Tierzucht. 43:547–560.
   Google Scholar
• Turner AI, Hemsworth PH, Tilbrook AJ. 2005. Susceptibility of reproduction in female pigs to impairment by stress or elevation of cortisol. Domest Anim Endocrinol. 29:398–410.
   PubMed Web of Science ®Google Scholar
• Ullrey DE, Sprague JI, Becker DE, Miller ER. 1965. Growth of the swine fetus. J Anim Sci. 24:711–717.
   PubMed Web of Science ®Google Scholar
• van der Staay FJ, Schuurman T, Hulst M, Smits M, Prickaerts J, Kenis G, Korte SM. 2010. Effects of chronic stress: a comparison between tethered and loose sows. Physiol Behav. 100:154–164.
   PubMed Web of Science ®Google Scholar
• Vangen O, Holm B, Valros A, Lund MS, Rydhmer L. 2005. Genetic variation in sows’ maternal behaviour, recorded under field conditions. Livest Prod Sci. 93:63–71.
   Google Scholar
• van Nieuwamerongen SE, Bolhuis JE, van der Peet-Schwering CM, Soede NM. 2014. A review of sow and piglet behaviour and performance in group housing systems for lactating sows. Animal. 8:448–460.
   PubMed Web of Science ®Google Scholar
• Vasdal G, Østensen I, Melišová M, Bozděchová B, Illmann G, Andersen IL. 2011. Management routines at the time of farrowing—effects on teat success and postnatal piglet mortality from loose housed sows. Livest Sci. 136:225–231.
   Web of Science ®Google Scholar
• Veum TL, Crenshaw JD, Crenshaw TD, Cromwell GL, Easter RA, Ewan RC, Nelssen JL, Miller ER, Pettigrew JE, Ellersieck MR. 2009. The addition of ground wheat straw as a fiber source in the gestation diet of sows and the effect on sow and litter performance for three successive parities. J Anim Sci. 87:1003–1012.
   PubMed Web of Science ®Google Scholar
• Weary DM, Pajor EA, Fraser D, Honkanen AM. 1996a. Sow body movements that crush piglets: a comparison between two types of farrowing accommodation. Appl Anim Behav Sci. 49:149–158.
   Web of Science ®Google Scholar
• Weary DM, Pajor EA, Thompson BK, Fraser D. 1996b. Risky behaviour by piglets: a trade off between feeding and risk of mortality by maternal crushing? Anim Behav. 51:619–624.
   Web of Science ®Google Scholar
• Widowski TM, Curtis SE. 1989. Behavioral responses of periparturient sows and juvenile pigs to prostaglandin F2 alpha. J Anim Sci. 67:3266–3276.
   PubMed Web of Science ®Google Scholar
• Wischner D, Kemper N, Krieter J. 2009. Nest-building behaviour in sows and consequences for pig husbandry. Livestock Ence. 124:1–8.
   Web of Science ®Google Scholar
• Wülbers-Mindermann M, Berg C, Illmann G, Baulain U, Algers B. 2015. The effect of farrowing environment and previous experience on the maternal behaviour of sows in indoor pens and outdoor huts. Animal. 9:669–676.
   PubMed Web of Science ®Google Scholar
• Xue L, Piao X, Li D, Li P, Zhang R, Kim SW, Dong B. 2012. The effect of the ratio of standardized ileal digestible lysine to metabolizable energy on growth performance, blood metabolites and hormones of lactating sows. J Anim Sci Biotechnol. 3:11–17.
   PubMed Web of Science ®Google Scholar
• Yi R, Wang C, Zhang X, Zhao P, Zhang M, Li X, Cui S, Liu H, Bao J. 2019. Maternal behavior, posture change, and production performance of lactating sows housed in an enriched environment. J Appl Anim Welf Sci. 22:298–308.
   PubMed Web of Science ®Google Scholar
• Yun J, Swan KM, Farmer C, Oliviero C, Peltoniemi O, Valros A. 2014. Prepartum nest-building has an impact on postpartum nursing performance and maternal behaviour in early lactating sows. Appl Anim Behav Sci. 160:31–37.
   Web of Science ®Google Scholar
• Yun J, Valros A. 2015. Benefits of prepartum nest-building behaviour on parturition and lactation in sows - a review. Asian-Australas J Anim Sci. 28:1519–1524.
   PubMed Web of Science ®Google Scholar
• Zanella AJ, Broom DM, Hunter JC, Mendl MT. 1996. Brain opioid receptors in relation to stereotypies, inactivity, and housing in sows. Physiol Behav. 59:769–775.
   PubMed Web of Science ®Google Scholar
• Zhang ZF, Li J, Park JC, Kim IH. 2013. Effect of vitamin levels and different stocking densities on performance, nutrient digestibility, and blood characteristics of growing pigs. Asian-Australas J Anim Sci. 26:241–246.
   PubMed Web of Science ®Google Scholar