[Altmann J. (1974). Observational study of behaviour: sampling methods. Behaviour, 49: 227-267.]Search in Google Scholar
[Animut G., Goetsch A.L. (2008). Co-grazing of sheep and goats: Benefits and constraints. Small Rumin. Res., 77: 127-145.]Search in Google Scholar
[Arnold G.W. (1962). The influence of several factors in determining the grazing behaviour of Border Leicester × Merino sheep. Grass Forage Sci., 17: 41-51.]Search in Google Scholar
[Borys B., Gazecki J., Dankowski A. (1990). Observations on behaviour of ewes kept under roofing or inasheep-fold (in Polish). Prz. Nauk. Lit. Zoot., Zesz. Spec., III: 328-333.]Search in Google Scholar
[Chudoba K., Nowakowski P., Ćwikła A. (2000). Temporal and spatial aspetcts of mixed grazing of cattle, sheep and goats on natural mountain pasture (in Polish). Zesz. Nauk. AR Wrocław, Konferencje, XXX: 109-118.]Search in Google Scholar
[Dudzinski M.L., Arnold G.W. (1979). Factors influencing the grazing behaviour of sheep in a Mediterranean climate. Appl. Anim. Ethol., 5: 125-144.]Search in Google Scholar
[Fraser A.F. (1980). Farm animal behaviour. Baillière Tindall, London, 291 pp.]Search in Google Scholar
[Gräser- Herrmann C., Sambraus H.H. (2001). The social behaviour of East Friesian dairy sheep in larger groups. Arch. Tierz., 44: 421-433.]Search in Google Scholar
[Hobson J.A. (1994). Sleep and Dreaming. In: Kimble D., Colman A.M. (Eds) (2001). Biological aspects of behaviour. Wyd. Zyski S-ka,. Wyd. I, Poznań, pp. 96-124.]Search in Google Scholar
[Hughes G.P., Reid D. (1951). Studies on the behavior of cattle and sheep in relation to utilization of grass. J. Agricultural Sci., 41: 350-355.]Search in Google Scholar
[Hulet C.V., Alexander G., Hafez E.S.E. (1975). The behaviour of sheep. In: Hafez E.S.E. (Ed.), The behaviour of domestic animals. Baillière Tindall, London, Third edition, pp. 246-294.]Search in Google Scholar
[Hutchins M., Kleiman D.G., Geist V., Mc Dade M.C. (Eds) (2003). Grzimek's Animal Life Encyclopedia, 16, Mammals V, Gale Group, Farmington Hills, 589 pp.]Search in Google Scholar
[Jezierski T.A. (1987). Behaviour of cattle of different utility traits depending on genotype and management system (in Polish). Pr. hab. Wyd. Ossolineum, Warszawa, 154 pp.]Search in Google Scholar
[Neja W., Bogucki M. (2005). Effect of the maintenance system on the selected behaviour traits of cows (in Polish). Rocz. Nauk. PTZ., (Suppl. 1): 63-68.]Search in Google Scholar
[Nowicki B., Zwolińska- Bartczak I. (1983). Farm animal behaviour. An introduction (in Polish). PWRi L, Warszawa, 266 pp.]Search in Google Scholar
[Piccione G., Bertolucci C., Caola G., Fo à A. (2007). Effects of restricted feeding on circadian activity rhythms of sheep a brief report. Appl. Anim. Behav. Sci., 107: 233-238.]Search in Google Scholar
[Piccione G., Giannetto C., Casella S., Caola G. (2008 a). Circadian activity rhythm in sheep and goats housed in stable conditions. Folia Biol. (Kraków), 56: 133-137.10.3409/fb.56_3-4.133-13719055037]Search in Google Scholar
[Piccione G., Giannetto C., Casella S., Caola G. (2008 b). Seasonal change of daily motor activity rhythms in Capra hircus. Can. J. Anim. Sci., 88: 351-355.10.4141/CJAS07125]Search in Google Scholar
[Piccione G., Giannetto C., Marafioti S., Casella S., Caola G. (2010). The effect of photic entrainment and restricted feeding on food anticipatory activity in Ovis aries. Small Rumin. Res., 94: 190-195.]Search in Google Scholar
[Piccione G., Giannetto C., Marafioti S., Casella S., Caola G., Assenza A., Fazio F. (2011). Effect of different farming management on daily total locomotor activity in sheep. J. Vet. Behav., 6: 243-247.]Search in Google Scholar
[Regulation of the Minister of Agriculture and Rural Development of 28 June 2010 on minimum conditions of keeping individual species of livestock other than those for which standards of protection have been specified in European Union provisions (Journal of Laws 10.116.778).]Search in Google Scholar
[Rutter S.M. (2002). Behaviour of sheep and goats. In: Jensen P. (Ed.). The ethology of domestic animals: an introductory text. CAB International, Wallingford, pp.145-158.10.1079/9780851996028.0145]Search in Google Scholar
[Schwintzer J. (1983). Das Milchschaf. Verlag Eugen Ulmer, Stuttgart, 208 pp.]Search in Google Scholar
[Stevenson J.R., Marrow P., Preston B.T., Pemberton J.M., Wilson K. (2004). Adaptive reproductive strategies. In: Clutton-Brock T.H., Pemberton J.M. (Eds). Soay Sheep: Dynamics and selection in an Island population. Cambridge University Press, pp. 243-275.]Search in Google Scholar
[Sztych D., Wilczak M. (2005). Daytime activity of goats kept in confinement (in Polish). Rocz. Nauk. PTZ, (Suppl. 1): 75-80.]Search in Google Scholar
[Annexe to Decision No 39 of the Minister of Agriculture and Rural Development of 7 September 1999 concerning the Act on organization of breeding and reproduction of farm animals of 20 August 1997 (Journal of Laws 2.207.1762). ]Search in Google Scholar