1_AST_2_June_2022S. Slavova*, T. Angelova, J. Krastanov Agricultural Institute, 6000 Stara Zagora, Bulgaria (Manuscript received 4 April 2022; accepted for publication 23 May 2022) Abstract. Bio-economic models for deriving economic weights in livestock have a significant development

I. Marinov1, D. Dimov2, T. Penev2* 1Department of Animal Husbandry – Ruminants and Dairy Farming, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Applied Ecology and Animal Hygiene, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bul

T. Penev1*, D. Dimov1, N. Vasilev2, J. Mitev1, Tch. Miteva1, I. Marinov3, M. Stojnov1 1Department of Applied Ecology and Animal Hygiene, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Obstetrics, reproduction and reproductive disorders, Faculty o

Abstract. The study comprises 143 Black-and-White cows from three cattle farms with free cubicle rearing (one) and tied rearing (two). The number of cows by farms is as follows: farm 1 – 69 cows, farm 2 – 34 cows and farm 3 – 40 cows. All cows in lactation from Ist to VIIth at the tim

J. Mitev, T. Penev, Zh. Gergovska, Ch. Miteva, N. Vassilev, K. Uzunova Abstract. Dairy cattle welfare is of exceptional importance in modern production systems. The purpose of the present study was to compare the effect of some of most popular contemporary solutions for free-stall hou