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Latest information in relation to Postpartum Dysgalactia Syndrome of sows

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V. G. PAPATSIROS (Β.Γ. ΠΑΠΑΤΣΙΡΟΣ), C. ALEXOPOULOS (Κ. ΑΛΕΞΟΠΟΥΛΟΣ), S. C. KYRIAKIS (Σ.Κ. ΚΥΡΙΑΚΗΣ)
V. G. PAPATSIROS (Β.Γ. ΠΑΠΑΤΣΙΡΟΣ), C. ALEXOPOULOS (Κ. ΑΛΕΞΟΠΟΥΛΟΣ), S. C. KYRIAKIS (Σ.Κ. ΚΥΡΙΑΚΗΣ)

Abstract


The «Postpartum Dysgalactia Syndrome» (PPDS), that is referred in literature as «Periparturient Hypogalactia Syndrome» (PHS), causes important economical losses in die global swine industry. The aetiology of syndrome includes endotoxins and generally die negative, as well as some positive gram bacteria (colibacteroides, ß-haemolytic streptococci G and L, staphylococci, Arcanobacterium pyogenes, Proteus, Bacteroides, Clostridium and Haemophilus). Moreover, several aetiological agems of functional hypoagalactia, factors associated widi stress of sows and conditions that contribute in the proliferation of bacteria and consequendy in the potential endotoxemia (e.g. cystitis, metritis, vaginitis, constipation, mastitis), seem to play a significant role. Risk factors that are often suspected for PPDS are the health status of sows (Fat Sow Syndrome-¥SS, extended duration of parturition, post-partum pyrexia, teat malformation and injuries, as well as hypoplasia of mammary glands), the housing and management conditions of the sow around parturition (slippery floors, hygiene, temperaturehumidity of rooms, reduced activity of the sows, watering system), as well as diet composition (concentration of fiber, proteins, vitamin E and selenium). The clinical signs are characterized mainly by disorders of lactation and health status of sows (anorexia, depression, pyrexia, constipation and abnormal postpartum vulval discharge), as well as from decreased litter performance (unsuccessful attempts for suckling, intense discomposure, diarrhoea, poor growth rates, unevenness of litters regarding to body weight of piglets, increase of preweaning mortality).

 


Keywords


sow; hypogalactia/agalactia; piglets

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References


Alexopoulos C, Georgoulakis ΙΕ, Tzivara A, Kritas SK, Siochu A and Kyriakis SC. (1987). Field evaluation of the efficacy of a probiotic containing Bacillus licheniformis and Bacillus subtilis spores, on the health status and performance of sows and their litters. J Anim Sci, 65(5): 1249-1256.

Alexopoulos C, Kritas SK, Kyriakis CS, Tzika E, Kyriakis SC. (2005). Sow performance in an endemically porcine reproductive and respiratory syndrome (PRRS) infected farm after sow

vaccination with an attenuated PRRS vaccine. Vet Microbiol, 111 (3-4): 151-157.

Algers B, de Passile AMB. (1991). A new view of piglet mortality (Enny syn pa smagrisdodligheten). Sven Vet Tidn, 43: 659-663.

Ambronn G. (1973). Catosal in Grob und Kleintierpraxis (Kollegen berichten). Vet Med Nachr, 2: 165-167.

Anderson JF, and Werdin RE. (1977). Ergotism manifested as agalactia and gangrene in sows. J Am Vet Med Assoc, 170:1089-1091.

Arnhofer G. (1986). Dissertation, München Tierärztliche, Fakultät. Germany.

Babinszky LDJ, Langhout MW A, Versiegen LA, den Hartog Ρ, Joling and Nieuwland M. (1991). Effect of vitamin E and fat source in sows' diets on immune response of suckling and weaned

piglets. J Anim Sci, 69: 1833-1842.

Backstrom L, Connors J, Price W, Larson R, and Morko A. (1982). Mastitis-metritis-agalactia (MMA) in the sow: A field survey of MMA and other farrowing disorders under different gestation and farrowing housing conditions. In: Proceedings of the 7th International Pig Veterinary Society Congress, Mexico City, Mexico: 175.

Bara MR, and Cameron RDA. (1996). The effect of faecal accumulation in farrowing crates and hand farrowing on the incidence of post-farrowing discharges and reproductive performance in sows. In: Proceedings of the 14th International Pig Veterinary Society Congress, Bologna, Italy: 574.

Berner Η, and Jochle W. (1986). Influence of induction of parturition in the sow with a PGF analog (alfaprostol) on bacterial ascendance into and colonization of the puerperal uterus. In:

Proceedings of the 9th International Pig Veterinary Society Congress. Barcelona, Spain: 103.

Bertschinger HU & Fairbrother JM. (1999). Escherichia coli infections. In: Diseases of Swine (8th ed). Straw B.E., D'Allaire S, Mengeling WL, Taylor DJ. (eds), Ames, Iowa, Iowa State University Press: 431-468

Bertschinger HU, and Buhlmann A. (1990). Absence of protective immunity in mammary glands after experimentally induced coliform mastitis. In: Proceedings of the 11th International Pig Veterinary Society Congress, Lausanne, Switzerland: 175.

Bevers MM, Willemse AH, and Kruip ΤΑΜ. (1983). The effect of bromocryptine on luteinizing hormone levels in the lactating sow: Evidence for a suppressive action by prolactin and the suckling stimulus. Acta Endocrinologica, 104: 261-265.

Bilkei G, Bolcskei A, Clavadetscher E, Goos T, Hofmann C, Bilkei H, and Szenci O. (1995). The periparturient disease complex of the sow in intensive husbandry. The influence of prophylactic

oral medication on the occurrence of puerperal disease complex of the sow. Beri Munch Tierarztl Wschr, 108: 8-13.

Bilkei G. (1992). The effects of various treatments on the duration of parturition in sows, with reference to dam body condition. Tierarztl Prax, 20: 153-158.

Bilkei Papp G. (1994). Perinatal losses in general condition of sows. III. Experiences obtained with prednisolone pretreatment. Magy Allatorv Lap, 49: 680-683.

Blaney BJ, McKenzie RA, Walters JR, Taylor LF, Bewg WS, Ryley M J and Maryam R. (2000a). Sorghum ergot (Claviceps africana) associated with agalactia and feed refusal in pigs and dairy cattle. Aust Vet J Vol 78, No 2: 102-107.

Blaney BJ, Kopinski JS, Magee MH, McKenzie RA, Blight GW, Maryam R and Downing JA. (2000b). Blood prolactin depression in growing pigs fed sorghum ergot (Claviceps africana). Australian Journal of Agricultural Research 51(6): 785-791.

Cerne F, and Jochle W. (1981). Clinical evaluations of a new prostaglandin analog in pigs: Control of parturition and of the MMA-syndrome. Theriogenology, 16: 459-467.

Cerne F, Jerkovic I, and Debeljak C. (1984). Influence of Finadyne on some clinical signs of MM A. In: Proceedings of the 8th International Congress of the Pig Veterinary Society, Ghent, Belgium: 290.

Chavez ER, and Patton KL. (1986). Response to injectable selenium and vitamin E on reproductive performance of sows receiving a standard commercial diet. Can J Anim Sci, 66: 1065-1074.

Close WH and Cole DJA. (2000). Practical feeding strategies. In: Nutrition of Sows and Boars, Close WH and Cole DJA. (Eds). Nottingham University Press, Nottingham, NG11 0AX, United Kingdom: 293-332.

de Passille AM, Rushen J, Foxcroft GR, Aherne FX, Schaefer A. (1993). Performance of young pigs: relationships with periparturient progesterone, prolactin and insulin of sows. J Anim Sci, 71(1): 179-184.

Done SH & Paton DJ (1995) Porcine reproductive and respiratory syndrome: clinical disease, pathology and immunosuppression. Vet Ree, 136: 32-35

Döring F and Friton G. (2003). Control losses from MMA and locomotor disorders. Boehringer Ingelheim Animal Health GmbH, Ingelheim, Germany.

Ehnvall R, Einarsson S, Larson K, Hard af Segerstad C, and Westerberg L. (1977). Prostaglandin-induced parturition in swine field study on its accuracy after treatment with different amounts of PGF. Nord Vet Med, 29: 376-380.

Elmore RG, and Martin CE. (1986). Mammary glands. In Diseases of Swine. 6th ed. Ed. Leman AD, Straw BE, Glock WL, Mengeling WL, Penny HC, and Scholl E. Ames: Iowa State Univ Press: 168-183.

Erazo GP, Marca J, Navarrete E. (2002). Field trials with inmodulen® in gestating sows. In: Proceedings of the 17th International Pig Veterinary Society Congress, Ames, Iowa, USA, vol. 2: 274.

Farmer C, Robert S, Choiniere Y. (1998). Reducing ambient temperature in farrowing houses with a new controlled environment system. Can J Anim Sci, 78: 23-28.

Floss G, Cassady JM, Robbers JE. (2006). Influence of ergot alkaloids on pituitary prolactin and prolactin-dependent processes. Journal of Pharmaceutical Sciences, vol. 62, Issue 5:699 – 715

Fraser D, Phillips PA, Thompson BK, and Peeters Weem WB. (1988). Use of water by piglets in the first days after birth. Can J Anim Sci, 68: 603-610.

Fraser D and Phillips PA. (1989). Lethargy and low water intake by sows during early lactation: A cause of low piglet weight gains and survival? Applied Anim Behav Sci, 24:13-22.

Genest M, and D'Allaire S. (1995). Feeding strategies during the lactation period for first-parity sows. Can J Anim Sci, 75: 461-467.

Gillespie TG. (1984). Stray electric voltage. In: Proceedings of Swine Herd Health Program Conference: 260.

Goransson L. (1989a). The effect of dietary crude fibre content on the frequency of post partum agalactia in the sow. J Vet Med, 36:474-479.

Goransson L. (1989b). The effect of feed allowance in late pregnancy on the occurrence of agalactia post-partum in the sow. J Am Vet Med Assoc, 36:505-513.

Grandemange E., Davot JL, Boisramé Β. (2000). Field evaluation of tolfenamic acid in the treatment of metritis-mastitis-agalactia syndrome in sows. In: Proceedings of the 16th International Pig Veterinary Society Congress Melbourne, Australia: 391.

Groskreutz KA. (1976). Das Milcfieber. Schweineprod 7, 9: 230.

Guzman P. (2002). Lactation problems in sows: New trials and data concerning the effectiveness of the systematic use of flunixin megloumine post-farrowing. In: Proceedings of the 17th International Pig Veterinary Society Congress, Ames, Iowa,

USA, 2:686

Hansen LH. (1979). Reproductive efficiency and incidence of MMA after controlled farrowing using a prostaglandin analogue, cloprostenol. Nord Vet Med, 31: 122-128.

Harvey R. (2001). Mastitis, metritis and agalactia. The Pig Journal, 48: 61-65

Hayek MG, Mitchell GE, Harmon JRJ, Stahly TS, Cromwell GL, Tucker RE, and Barker KB. (1989). Porcine immunoglobulin transfer after prepartum treatment with selenium or vitamin E.

J Anim Sci, 67: 1299-1306.

Hirsch AC, Philipp Η, Kleemann R. (2003). Investigation on the efficacy of meloxicam in sows with mastitis-metritis-agalactia syndrome. J Vet Pharmacol Therap, 26: 355-360.

Holtz W, Hartmann JF, and Welp C. (1983). Induction of parturition in swine with prostaglandin analogs and oxytocin. Theriogenology, 19: 583-592.

Holyoake PK, Dial GD, Trigg T, and King VL. (1995). Reducing pig mortality through supervision during the perinatal period. J Anim Sci, 73:3543-3551.

Hoy S, Friton G. (2004). Preliminary findings of the pharmacoeconomic benefit evaluation of meloxicam (metacam) treatment on litter performance of sows with MMA-syndrome. In: Proceedings of the 18th International Pig Veterinary Society Congress, Hamburg, Germany, vol. 2: 597.

Jensen HM. (1981). Forebyggelse af farefeber (MMA) komplekset vet reduktion af fodret til den draektige sode sidste 3 uger for faring. Dansk Vet Tidsskr, 64: 659-662.

Jinior IC, Porto FBL, Muniz A, Vianna WL, Santos SFA, Martins SMMK, Moretti AS. (2004). Effect of metoclopramide on milk production in the sow and the performance of piglets. In: Proceedings of the 18th International Pig Veterinary Society Congress, Hamburg, Germany, vol. 2: 489.

Jones GM, Waxenecker F, Sacherer Κ and Valantiniene J. Dietary solutions to prevent infertility problems in sows. (2004). In: Proceedings of the 18th International Pig Veterinary Society Congress, Hamburg, Germany, Vol. 2: 501.

Jones JET. (1971). Reflections on post-parturient diseases associated with lactational failure in sows. Vet Res, 89: 72-77.

Jones JET. (1976). Bacterial mastitis and endometritis in sows. In: Proceedings of the 4th International Pig Veterinary Society Congress, Ames, Iowa, USA: 6.

Jorsal SE. (1986). Epidemiology of the MMA-syndrome. A field survey in Danish sow herds. In: Proceedings of the 9th International Pig Veterinary Society Congress. Barcelona, Spain: 93.

Katsaounis NC & Spais AV. (1998). Swine Husbandry. Thessaloniki, Eds Current Education.

Klopfenstein C, D'Allaire S, and Martineau GP. (1995). Effect of adaptation to the farrowing crate on water intake of sows. Livest Prod Sci, 43: 243-252.

Klopfenstein C, Farmer C, Martineau GP. (1999). Diseases of the mammary glands and lactation problems. In: Diseases of Swine (8th ed). Straw BE, D'Allaire S, Mengeling WL, Taylor DJ (eds), Ames, Iowa, Iowa State University Press: 833-860

Klopfenstein C. (2003). Variation temporelle des caractéristiques comportementales et physiologiques des truies qui allaitent les portées a croissance faible et normale en période du peripartum. These de Doctorat. Universite de Mondreal, Mondreal.

Kopinski JS, Blaney BJ, Downing JA, Mcveigh JF, Murray S-A. (2007). Feeding sorghum ergot (Claviceps africana) to sows before farrowing inhibits milk production. Aust Vet J, 85: 169-176.

Korudzhiiski N, Bozhkova G, Gulubinov GV, Dzhurova I, Georgiev S. (1987). Microbial etiology of the MMA-syndrome (mastitismetritis- agalactia) in swine raised commercially. Vet Med Nauki,

(5): 11-5

Kyriakis SC, Alexopoulos C and Saoulidis K. (1997). Update for present status of porcine reproductive and respiratory syndrome (PRRS) in Greece. In: Proceedings of the 2nd International Meeting of Swine Medicine, Thessaloniki, 17 October 1997.

Aristotle University of Thessaloniki, School of Veterinary Medicine, Department of Clinical Studies, Clinic of Productive Animal Medicine: 42-44.

Kyriakis SC, Kritas SK, Tsinas AC, Alexopoulos C, Paschaleri-Papadopoulou E. (1996). Porcine Reproductive and Respiratory Syndrome (PRRS): present status of the disease and the Greek experience. Journal of Hellenic Veterinary Medical Society, 47:163-173.

Kyriakis SC & Alexopoulos C. (1998). Metritis in sows. Roche Vet Club Meeting, July 10. London, England.Madec F, Miquet JM, and Leon E. (1992). La pathologie de laparturition chez la truie: étude épidémiologique dans cinq élevages. Ree Med Vet, 168: 341-349.

Mahan DC, Kim YY, and Stuart RL. (2000). Effect of vitamin E sources (RRR- or all-rac-a-tocopheryl acetate) and levels on sow reproductive performance, serum, tissue and milk atocopherolcontents over a five-parity period, and the effects on the progeny. J Anim Sci, 78: 110-119

Mahan DC. (1994). Effects of dietary vitamin E on sow reproductive performance over a five-parity period. J Anim Sci, 72: 2870-2879.

Marchant, J. (1997). It is a hard life for sows in these pools of discontent. Pig Farming Apr: 36-37.

Martin CE, Hooper BE, Armstrong CH, and Amstutz HE. (1967). A clinical and pathologic study of the mastitis-metritis-agalactia syndrome of sows. J Am Vet Med Assoc, 151: 1629-1634.

Martineau GP, and Klopfenstein C. (1996). Les syndromes corporelles chez la truie. Journ Rech Porcine France, 28: 331-338.

Martineau GP, Smith BB, Doize B. (1992). Pathogenesis, prevention and treatment of lactational insufficiency in sows. VeterinaryClinics of North America: Food Anim Pract 8: 661-684

Martineau GP. (1990). Body building syndrome in sows. In: Proceedings of American Association Swine Practitioners, Denver: 345-348.

Martineau GP. (1998). Postpartum dysgalactia syndrome and mastitis in sows. In: The Merck Veterinary Manual, 8th ed., Aiello S. (ed), Whitehouse Station, New Jersey: 1020-1023

Meredith MJ. (1995). Pig breeding and inferility. In: Animal Breeding and Infertility. Meredith MJ (ed), Oxford, UK, Blackwell Science Ltd: 278-353

Messias de Bragana M, Mounier AM, Hulin JC, and Prunier A. (1997). La sous-nutrition explique-t-elle les effets doune température ambiante leve sur les performances des truies? Journ Rech Porcine France, 29: 81-88.

Mirko CP, Bilkei G. (2004). Acute phase proteins, serum Cortisol and weaning litter performance in sows suffering from periparturient disease. Acta Vet (Beograd), 54: 153-161.

Morko A, Backstrom L, Lund L, and Smith AR. (1983). Bacterial endotoxin in blood of dysgalactic sow in relation to microbial status of uterus-milk and intestine. J Am Vet Med Assoc, 183:786-789.

Moser RL, Cornelius SG, Pettigrew JE, Hanke HE, Heeg TR, and Miller KP. (1987). Influence of postpartum feeding method on performance of the lactating sow. Livest Prod Sci, 16: 91-99.

Neil M. (1996). Ad libitum lactation feeding of sows introduced immediately before, at or after farrowing. Anim Sci, 63: 497-505.

Nemec M, Butler G, Hidiroglou M, Farnworth ER, and Nielsen K. (1994). Effect of supplementing gilts' diets with different levels of vitamin E and different fats on the humoral and cellular immunity of gilts and their progeny. J Anim Sci, 72: 665-676.

Pejsak A, Tarasuik K, and Jochle W. (1988). Immunoprophylaxis against MMA and/or CM in sows with a vaccine against urinary tract infections (Urovac). In: Proceedings of the 10th International Pig Veterinary Society Congress, Rio de Janeiro, Brasil: 307.

Pejsak Z, and Tarasiuk K. (1989). The occurrence of endotoxin in sows with coliform mastitis. Theriogenology, 32: 335-341.

Penny RHC. (1970). The agalactia complex in the sow: A review. Aust Vet J, 46: 153-159.

Phillips PA, and Fraser D. (1991). Discovery of selected water dispensers by newborn pigs. Can J Anim Sci, 71: 223-236.

Plumb DC. (2002). Veterinary Drug Handbook (4th Ed). Iowa State Press, A Blackwell Publishing Company, 2121 State Avenue, Ames, Iowa 50014-8300

Ravel A, D' Allaire S, and Bigras Poulin M. (1996). Influence of management, housing and personality of the stockperson on preweaning performances on independent and integrated swine farms in Quebec. Prev Vet Med, 29: 37-57.

Ringarp N. (1960). Clinical and experimental investigation into a postparturient syndrome with agalactia in sows. Acta Vet Scand, (Suppl) 7: 34.

Robert S, Matte JJ, and Martineau GP. (1996). Sensitivity of reproducing sows and suckling pigs to stray voltage. Am J Vet Res, 57: 1245-1249.

Rose M, Schnurrbusch U, and Heinrotzi H. (1996). The use of cequinome in the treatment of pig respiratory disease and MMAsyndrome. In: Proceedings of the 14th International Pig Veterinary Society Congress, Bologna, Italy: 317.

Samanc H, Damnjanovic Z, Radojicic B, and Stojic V. (1992). Cortisol, triiodothyronine, thyroxine and glucose concentrations in the blood of first litter sows during advanced pregnancy and post partum in relation to hypogalactia and agalactia. Acta Vet (Beograd), 42: 109-114.

Sandstedt H, and Sjogren U. (1982). Forebuggande atgarder vid hog frekvens av MMA i suggbesattningar. Sven Vet Tidn, 34: 487-490.

Sandstedt H, Sjogren U, and Swahn O. (1979). Foreguggande atgarder mot MMA (agalakti) hos sugga. Sven Vet Tidn, 31:193-196.

Sandstedt H. (1983). Agalakti hos sugga. Medlemsbl Sveriges Vet Forb, 5: 103.

Schoning G, and Plonait H. (1990). Herd prophylaxis and treatment of the mastitis-metritis-agalactia syndrome of sows with enrofloxacin (Baytril). Dtsh Tierarztl Wschr, 97: 5-10.

Smith BB, and Wagner WC. (1985a). Effect of dopamine agonists or antagonists-TRH-stress and piglet removal on plasma concentrations of prolactin in lactating sows. Theriogenology, 3:283-296.

Smith BB, and Wagner WC. (1985b). Effect of Escherichia coli endotoxin and TRH on prolactin in lactating sows. Am J Vet Res, 46:175-180.

Smith BB, Martineau G, Bisaillon A. (1992). Mammary glands and lactation problems. In: Diseases of Swine. Leman AD, Straw BE, Mengeling WL, D Allaire S, Taylor DJ. (eds), Ames, Iowa, Iowa State University Press: 40-61.

Smokovitis A. (1993). Physiology. Thessaloniki, Eds Kyriakidis. Starnati S, Alexopoulos C, Siochu Α., Saoulidis K, Kyriakis SC. (2006). Probiosis in sows by administration of bacillus toyoi

spores during late pregnancy and lactation: effect on their health status/performance and on litter characteristics. International Journal of Probiotics and Prebiotics, vol. 1: 33-40.

Tabjara P, Soares M and Richard A. (1992). Genital status and litter performance of sows treated with antibiotics to control MMA. In: Proceedings of the 12th International Pig Veterinary Society

Congress, The Hague, The Netherlands: 473.

Taylor DJ. (1999). Reproductive disorders. In: Pig Diseases (7thed). Bury St Edmunds, Suffolk, St Edmundsburry Press Ltd.:354-365

Thomas E, Deleforge J, Pupin P, and Le Coz P. (1992). Field trials on the treatment of metritis-mastitis-agalactia in sows using tolfenamic acid. Results of a comparative blind field trial.

Bulletin des GTV: 69-76.

Titterington RW, Fraser D. (1975). The lying behaviour of sows and piglets during early lactation in relation to the position of creep heater. Appi Anim Eth, 2: 47-53.

Tokach M & Tubbs RG (1997) Lactational insufficiency syndrome. In: Current Therapy in Large Animal Theriogenology. Youngquist RS (ed), Philadelphia, Pensylvania, WB Saunders Company: 745-749.

Trapp AL, Keahy KK, Whitenack DC, and Whitehair CK. (1970). Vitamin Ε-selenium deficiency in swine: Differential diagnosis and nature of field problems. J Am Vet Med Assoc, 157: 289-300.

Tsakalof Ρ & Saoulidis G (1983). Results of the treatment with two of oxytetracycline's forms in cases of metritis-mastitis-agalactia in sows. Journal of Hellenic Veterinary Medical Society, 26:

-352

Tsakalof P. (1990). Reproduction of domestic animals. Thessaloniki, Eds of Aristotle University of Thessaloniki.

Veterinary Vatmacum. (2001). Athens, Hellenic Drug Organization. Voggenberger G (1981). Die Vakzination tragender Sauen mit dem Escherichia-coli-Impfstoff Gletvax K88 (Wellcome). Diss.

Hannover.

Wagner WC. (1972). Endocrine function in normal and agalactic sows. J Anim Sei, 34: 270-272.

Waldmann,KH, and Heide J. (1996). Investigations on uterine contraction post partum and effects of different uterotonicia in puerperal sows. In: Proceedings of the 14th International Pig Veterinary Society Congress, Bologna, Italy: 614.

Wallace HD, Thieu DD, and Combs GE. (1974). Alfalfa Meal as a Special Bulky Ingredient in the Sow Diet at Farrowing and during Lactation. Research Report, Dept of Animal Science, Gainesville, Fla.

Wegmann G. (1993). Dissertation, Ludwig-Maximilians, Universität München, Germany.

Whitacre MD, and Threlfall WR. (1981). Effects of ergoeryptine on plasma prolactin, luteinizing hormone and progesterone in the periparturient sow. Am J Vet Res, 42: 1538-1541.

Whitehair CK, and Miller ER. (1986). Nutritional deficiencies. In Diseases of Swine. 6th ed. Ed. AD Leman, BE Straw, Glock WL, Mengeling WL, Penny HC, and Scholl E. Ames: Iowa State Univ Press: 746-762.

Whittemore CT, Fraser D. (1974). The nursing and suckling behaviour of pigs II: Vocalization of the sow in relation to suckling behaviour and milk ejection. Br Vet J, 130: 346-356.

Wuryastuti H, Stowe HD, Bull RW, and Miller ER. (1993). Effects of vitamin E and selenium on immune responses of peripheral blood, colostrum and milk leukocytes of sows. J Anim Sci, 71:2464-2472.

Zaleski HM, and Hacker RR. (1993). Variables related to the progress of parturition and probability of stillbirth in swine. Can Vet J, 34: 109-113.

Zyczko K, Kurcman B, and Gierej W. (1986). Secretion disorders of mammary glands in sows. Zootechnica, 29: 45-56.


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