22
DEC
2021

Somatic cells count in milk and its relation with productive traits in dairy cows

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
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29
DEC
2020

Influence of the age of first insemination and first calving in Holstein – Friesian heifers on farm economic efficiency

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
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29
DEC
2020

Effect of clinical mastitis at Holstein-Friesian cows on the farm economic efficiency

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
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17
DEC
2017

Study on the loss of accuracy of AC-method for milk yield control in sheep

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
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26
JUN
2015

Classification and regression tree analysis in modeling the milk yield and conformation traits for Holstein cows in Bulgaria

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
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27
JUN
2014

Effect of season, lactation period and number of lactation on mastitis incidence and milk yields in dairy cows

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
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06
MAY
2014

Effects of days open on the milk yield and the duration of the concurrent lactation in Bulgarian Murrah buffaloes

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
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06
MAY
2014

The effect of pregnancy on milk yield in Bulgarian Murrah buffalo cows

The effect of pregnancy on milk yield in Bulgarian Murrah buffalo cows P. Penchev, Y. Ilieva, Tz. Peeva
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05
MAY
2014

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

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