K. Zhelyazkova Department of sheep husbandry and breeding, Agricultural Academy, Agricultural Institute Stara Zagora, 6000, Bulgaria (Manuscript received 8 June 2025; accepted for publication 01 August 2025) Abstract. The prohibited use of nutritional antibiotics due to the emerging r

S. Slavova* Agricultural Institute, Radnevo road, 6000 Stara Zagora, Bulgaria (Manuscript received 11 July; accepted for publication 01 September 2022) Abstract. Selection is an important part of animal breeding and is usually performed on the basis of a set of traits, each of them ch

M. Yossifov, L. Kozelov Abstract. Two experiments were conducted to investigate effects of rapeseed meal (RSM) vs. sunflower meal (SFM) as a protein source at cereal-based isonitrigenous (at 16 % CP), iso-caloric at gross energy 18 kcal/kg and net (FUG=1) energy diets for fattening la

N. Stancheva, I. Dimitrova, S. Georgieva Abstract. The aim of the study is to determine the parameters of the biological fertility and milk production of sheep breed Dairy Synthetic Population from herd of the Agricultural Institute, Shumen. The survey covers 851 ewes born in the peri

I. Varlyakov, V. Radev, T. Slavov, G. Ganchev Abstract. A physiological experiment was conducted with three yearling sheep, Stara Zagora x Pleven Blackhead crosses, to establish the effect of feeding Paulownia elongatа leaves on some blood parameters. The trial consisted of two period

R. Ivanova Abstract. Most of the small ruminant flocks on the Balkan Peninsula are bred on pasture. Thus the animals are endangered to graze treated alfalfa, without observing quarantine. The instability of the pyrethroid insecticides in rumen alkaline pH of the sheep is the reason fo

I. Răducuţă Abstract. After the integration of our country within the EU have occurred major changes in many areas of activity and including in the sheep breeding sector. The purpose of this paper is to investigate the evolution and situation of sheep breeding sector in Romania in rel

Ts. Koynarski, L. Sotirov Abstract. The aim of the investigation was to determine the influence of the C3 component of the complement system on the levels of blood serum lysozyme and the alternative pathway of complement activity (APCA) in sheep. The experiment was carried out with sh

A. Pampukidou, M. Avdi, R. Ivanova, T. Alifakiotis Abstract. The aim of the present study was to investigate cryopreservation at day-5 and 6 of sheep embryos of Chios breed and goat embryos from indigenous Greek breed by the conventional one- or multi-step methods using glycerol and s

B. Bivolarski, Е. Vachkova, S. Laleva, P. Slavova, I. Ivanov Abstract: Comparative studies were carried out to evaluate the non-specific resistance and some metabolic profile parameters in Mouton Charollais sheep (n=16) and their offspring (n=10) depending on diet type. It was found o