10. Engblom L., Lundheim L., Schneider M., Dalin A.-M., Andersson K., 2009 - Animal 3, 783-790.
11. Grindfleck E., Sehested E., 1996 - Conformation and longevity in Norwegian pigs. Proc. of NJF Seminar No 265, 77-83.
12. Guo S., Gianola G., Rekaya R., Short T., 2001 - Livest. Prod. Sci. 72, 243-252.
13. Hendriks A., 2008 - Management for high sows longevity. http://www.thepigsite.com/articles/2/breeding-and-reproduction/2863/
14. Hewitt R., van Barneveld R., 2008 - Management strategies to maximize sow longevity and lifetime performance. www.porkcrc.com.au/2D-104_Progress_Report_Expt_3. pdf
15. Holder R.B., Lamberson W., Bates R., Safranski T., 1995-Anim. Sci. 61,115-121.
27. Stalder K.J., Karriker L., Johnson A., 2007 - The impact of gestation housing systems on sow longevity, http://pork.org/documents/sow20housingforum/procedings
28. Stalder K.J., 2008 - A new look at sow longevity, www.whiteshirehamrock.com.
29. Steenbergen E.J., Kanis E., Koops W.J., van der Steen H.A., 1990 - Exterior in sows: 1. Effect of parity number and association with reasons for disposal. Relevance of exterior appraisal in pig breeding. Wageningen.
30. Steenbergen E.J., Kanis E., Koops W.J., van der Steen H.A., 1990 - Exterior in sows: 2. Relationships with reproductive performance and longevity. Wageningen.
31. Sterning M., Rydhmer L., Eliasson-Selling L., 1998 - J. Anim. Sci. 76, 353-359.
32. Tantasuparuk W., Lundheim N., Dalin A.-M., Kunavongrit A., Einarsson S., 2001 - Livest. Prod. Sci. 69, 155-162.
33. Tarres J., Bidanel J.P., Hofer A., Ducrocq V., 2006 - J. Anim. Sci. 84, 2914-2924.
34. Tholen E., Bunter K.L., Hermesch S., Graser H., 1996 - Aust. J. Agric. Res. 47, 1261-1274.
35. Yazdi M.H., Lundheim N., Rydhmer L., Rindgmar-Cederberg E., Johansson K., 2000 - Anim. Sci. 71, 1-9.