N.P. Achi*1, J.N. Achi2, I. Mallam3 1Dairy Research Programme, National Animal Production Research Institute/Ahmadu Bello University, Shika, Zaria 2Department of Agricultural Education, School of Vocational Studies, Nuhu Bamali Polytechnic, Zaria 3Department of Animal Science, Kaduna

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

K. Stankov* Department of Management, Faculty of Economics, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 15 June 2019; accepted for publication 23 September 2020) Abstract. The present study aims to assess the influence of the age of first insemination and first

K. Stankov Department of Management, Faculty of Economics, Trakia University, 6000 Stara Zagora, Bulgaria (Manuscript received 22 August 2020; accepted for publication 16 October 2020) Abstract. A study was conducted on the effect of clinical mastitis at Holstein-Friesian cows on the

D. Dimov*, P. Zhelyazkova, A. Vuchkov Department of Animal Sciences, Faculty of Agronomy, Agricultural University, 4000 Plovdiv, Bulgaria (Manuscript received 30 June 2017; accepted for publication 5 September 2017) Abstract. The aim of this study was to investigate the loss of accura

A.Yordanova1*, S. Gocheva-Ilieva1, H. Kulina1, L. Yordanova2, I. Marinov3 1Department of Applied Mathematics and Modeling, Faculty of Mathematics and Informatics, Plovdiv University Paisii Hilendarski, 24 Tzar Asen, 4000 Plovdiv, Bulgaria 2Department of Mathematics and Informatics, Fa

T. Penev1*, Zh. Gergovska2, I. Marinov2, V. Kirov3, K. Stankov4, Y. Mitev1, Ch. Miteva1 1Department of Applied Ecology and Animal Hygiene, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 2Department of Animal Science, Faculty of Agriculture, Trakia University, 6

A study assigning 1021 lactations of 313 Bulgarian Murrah buffalo cows with milk yield recorded on the farm of Agricultural Institute – Shumen during the period 1967-2001 was initiated with the objective to estimate the effect of days open on the milk yield and the duration of the con

The effect of pregnancy on milk yield in Bulgarian Murrah buffalo cows P. Penchev, Y. Ilieva, Tz. Peeva

Factors affecting duration of the days open and its relation to productive traits in Black-and-White cows Zh. Gergovska