Role and importance of the awareness for whey in dairy sector at an international level

M. Yılmaz1*, H. Celik2, A.D. Karaman3, K. Celik4

1Department of Animal Science, Faculty of Agriculture, Adnan Menderes University Aydın, Turkey
2Economics and administrative sciences, Çanakkale on Sekiz Mart University, Çanakkale, Turkey
3Department of Dairy Technology, College of Agriculture, Adnan Menderes University, Aydın, Turkey 4Department of Animal Science, Faculty of Agriculture, Çanakkale on Sekiz Mart University, Çanakkale, Turkey

(Manuscript received 6 June 2017; accepted for publication 2 November 2017)

Abstract. The WHY-WHEY? is a training project supported by the EU with regard to the Erasmus+ program aiming at promoting awareness for it. In this study, the surveys carried out with the participants of a total of 4 workshops in Turkey, Italy, Poland and Hungary were evaluated. Whey is the main dairy by-product, rather than a waste, which is obtained during the coagulation of milk casein in cheese making and which is considered as a residual aqueous solution of lactose containing protein and minerals. Survey results indicated that whey is a significant source and it could facilitate the production of some different alternative products. However, there is a great lack in the knowledge and the awareness in this sense. For this reason, it could be said that more detailed surveys and result analyses could offer a solid base to develop a training course and didactic materials in a way that could completely meet the needs of the sector.

Carcass traits and meat quality of different slow growing and fast growing broiler chickens

M. Oblakova1, N. Mincheva1, P. Hristakieva1, I. Ivanova1, M. Lalev1, Sv. Georgieva2

1Agricultural Institute – Stara Zagora, 6000, Bulgaria
2Department of Genetic, Breeding and Reproduction, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria

(Manuscript received 3 July 2017; accepted for publication 5 October 2017)

Abstract. The experiment was conducted in the breeder farm of department Population genetics, reproduction and technologies of poultry and rabbits at the Agriculture Institute of Stara Zagora. Five lines from the National Gene Pool of Bulgaria: line Ss (Sussex), line E (Barred Plymouth Rock), line NG (New Hampshire), line F (NG x Red Rhode Island), line L (White Plymouth Rock) were used as maternal forms in the crossing schedule and line M (Cornish) as a paternal form for production of slow-growing broilers. The birds were grown to 84 days. Feeding was done with compound feeds according to the age: starter (1/14 days of age), grower (14/28 days of age), finisher (28/84 days of age). By the end of the experiment, slaughter analysis was performed with 3 female and 3 male broiler chickens per group with live weight corresponding to the average of each genotype. The live weight was determined, as well as the grill weight, the weights of cuts (breast, thighs, wings), edible offal (heart, liver, gizzard) and abdominal fat. On the basis of these data, the slaughter yield and body parts ratios were calculated. The data for the live body weights of birds at slaughtering indicated the highest values for group V – 4040g, followed by groups ІV and ІІ – 3271.67g and 3186.67g, respectively (p<0.05). There was a statistically significant difference between the sexes with superiority of male birds (p<0.001). In the other 3 groups, breast meat percentage ranged from 19.48 to 19.84%. The share of thighs from the grill was the greatest in slow-growing chickens from group II – 33.01%, followed by group І – 32.35%, group IV – 32.18%, and the lowest- in groups ІІІ and V (31.91% and 31.18%, respectively). The analysis of data exhibited a significant effect of the genotype on water content of breast meat (resp. Dry matter), with lower values in slow-growing birds from group III – 73.19% (p<0.05), whereas in the other groups it ranged between 73.44 and 73.62%. The dry matter higher percentage was associated with better lavor of meat. The analysis of the effect of genotype on meat protein content showed that protein content was the highest in the breast of slow-growing chickens from group III- 24.89% and lowest in the breast meat of conventional broilers from group V – 23.86% (p<0.05). In the other 3 groups, it ranged from 24.55 to 24.59%. The protein content of thighs was the lowest in slow-growing birds from group I- 19.49%, and the difference was the highest when compared to groups II and III, also slow-growing (p<0.05). With respect to the thigh fat content, it was the highest in slow-growing chickens from group IV (5.84%), followed by fast-growing from group V (5.33%) and the lowest- in slow-growing birds from group І – 4.12% (p<0.05). The analysis of data showed a statistically significant effect of the sex on water content (p<0.001), fat (p<0.001) and ash (p<0.01). In males, thigh meat contained water and ash and in females more fat. The interaction of genotype and sex effects were important for thigh meat fat content, with highest values in fast-growing females from group V – 5.98% and lowest in slowly growing males from group I – 3.88% (p<0.001). Weak but statistically significant interaction between both factors was found with respect to thigh protein and ash (p<0.05). The highest protein content was established in slow-growing females from group IV (19.81%), whereas thigh ash was with highest percentage in slow-growing males from group II (1.11%).

Mathematical methods for assessment and analysis of honey yield data for Bulgaria and the European Union for the period 1961-2014

N. Keranova*

Department of Mathematics, Informatics and Physics, Faculty of Economics, Agricultural University-Plovdiv, 4000 Plovdiv, Bulgaria (Manuscript received 30 May 2017; accepted for publication 27 September 2017)

Abstract. The objective of this work is to assess the average yields of bee honey for the period from 1961 to 2014 for all countries of the European Union. For this purpose, a single-factor analysis of variance was used. As a result of the surveys, it was found that the highest average yield of honey in the EU is in Germany (20541.91 t) and Spain (20253.43 t), while the lowest yield is in Ireland (199.74 t) and Luxembourg (133,2 t). Data on the production of bee honey in Bulgaria by regions from 2006 to 2014 were also analyzed, and mathematical models were made, reflecting the relationship between the respective honey yields and the survey period. The data on the basis of which the study was carried out are from the FAOSTAD database and the Agro-statistical reference book for 2000-2014 of the “Agro-statistics” Department of the Ministry of Agriculture, Food and Forestry of the Republic of Bulgaria.

Heavy metals in organs of gudgeon (Gobio gobio L.) from Vardar River, R. Macedonia

R. Nastova*, V. Kostov, I. Ushlinovska

Institute of Animal Science, “Ss. Cyril and Methodius” University, Blvd. Ilinden 92 A, 1000 Skopje, Republic of Macedonia (Manuscript received 4 August 2017; accepted for publication 13 November 2017)

Abstract. Ecotoxicological examinations based on seven heavy metals (Fe, Cu, Zn, Mn, Cd, Pb and Cr) concentrations in organs of gudgeon (Gobio gobio L.) caught by 14 monitoring points at Vardar River in Republic of Macedonia were performed. The organ’s samples elements were read-out on AAS in flame and graphite cuvette. Significant increase of Pb and Cd contents in liver, gills and gonads of fish sampled downstream Skopje and the town of Veles was found. It should be pointed out that at times Cd concentrations in muscles were as high as 0.518 mg/kg which is significantly over the maximally allowed concentrations for human nutrition.

Biodiversity of the macrozoobenthos in some protected marine areas along Bulgarian Black Sea coast

E. Petrova*, S. Stoykov

Institute of Fish Resources, 9000 Varna, Bulgaria
(Manuscript received 30 August 2017; accepted for publication 6 November 2017)

Abstract. The aim of this paper is to establish the biodiversity status of the macrozoobenthos in some protected marine areas (NATURA 2000) along the Bulgarian Black Sea coast. The observation stations in the period 2010-2012 were within the frames of the following habitats: 1160 – Large shallow inlets and bays; 1110 – Sandbanks, slightly covered by seawater and Sublittoral mussel banks on sediment. In general, the data shows steady state compared to the 1980s, except for the area near Kamchia River, characterized by low biodiversity due to water pollution from the river inflow (with contaminants from agricultural and industrial sources in the upper river stream) and less salinity leading to marine mussel species reduction. In the border area, near the Emona zone, the black mussel catches varied between 160-600 kg in 2005, while only single specimens were detected in 2013. In the same field, the yield of Rapana venosa was within the limits of 5-40 kg in 2005 and between 80-160 kg in 2013. The established variability showed a dynamic balance between Mytilus galloprovicialis and Rapana venosa that pose a challenge for future stock of the black mussel and point the need of regular monitoring.

Taxonomic composition of phytoplankton in Black Sea area in front of the Cape Galata (2008-2016)

D. Klisarova, D. Gerdzhikov

Institute of Fish Resources, 9000 Varna, Bulgaria
(Manuscript received 13 August 2017; accepted for publication 3 October 2017)

Abstract. In this article have been investigated the taxonomic structure of the phytoplankton communities developing in the Black Sea area in front of the Cape Galata. For the period 2008 – 2016, relatively high species diversity was found (161 species). Throughout the most of the year dominated class Dinophyceae (up to 54.17%). The number of phytoplankton species decreased with distance from the shore, but the percentage participation of the group of peridineas and diatoms in the general taxonomic composition grew. Only in class Prymnesiophyceae increased biodiversity was registered in the high seas

Inventory of the legal base for reclamation of lands disturbed by open-cast mining in Bulgaria

M. Banov*, V. Tzolova, I. Kirilov

N. Poushkarov Institute of Soil Science, Agrotechnologies and Plant Protection, 1080 Sofia, Bulgaria (Manuscript received 4 July 2017; accepted for publication 18 October 2017)

Abstract. Samples of geological materials, used for reclamation of land, disturbed by open coal mining have been investigated. The obtained results for the opportunities of biological regeneration of the lands fertility, reclaimed with these materials, put them in the following order: Pliocene clays from the region of Maritza Iztok (the biggest energy complex with the largest open coal mine in Bulgaria); marl materials from the area of the town of Pernik; and last – sulfur containing materials from the region of Chukurovo Mine, Sofia region. It is proposed that the period for biological reclamation, shown in Article 4, item 2 §(а) from Regulation No. 26/1996 for reclamation of disturbed areas, improvement of lands of low productivity, removal and utilization of the humus layer, must be changed from”5years”to”7-12years”for the lands reclaimed without humus and to”3-5years”for the lands reclaimed with of humus horizon used.

Saved СО2 emissions by using renewable sources for hot water yield in Bulgarian dairy farms

R. Georgiev1*, R. Slavov2, K. Peychev1, D. Georgiev1, S. Apostolov3, J. Ellingsen4, J. Tønnesen4

1Department of Agricultural Engineering, Faculty of Agriculture,Trakia University, 6000 Stara Zagora, Bulgaria
2Department of Animal Science – Ruminant Animals and Dairy Science, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria 3Bioselena Foundation for Organic Agriculture, Bulgaria
4Royal Norwegian Society for Development, Norges Vel, Norway

(Manuscript received 13 September 2017; accepted for publication 10 November 2017)

Abstract. In 2014 – 2015 installations for hot water yield from renewable energy sources were built and tested in three dairy farms in Bulgaria. These replace the traditionally used electricity on farms with the aim of decarbonising the energy production. The newly built installations contain three modules for heat yield – from recuperation of the heat from the milked milk, from the solar energy and from wood pellets. In the course of one year the energy obtained from the renewable sources has been measured and assessed. The present article assesses the ecological benefits of the separate renewable sources which are used to reduce СО2 emissions, the main greenhouse gas. For this purpose, the method of environmental life cycle analysis (LCA) and assessment of heat/hot water generating systems was used. Coefficients for calculating the primary energy of the saved or replaced energy, as well as their respective carbon ratios, specific for Bulgaria, were used. The results obtained are related to identifying the specific quantities of saved CO2 emissions from the renewable sources used on the experimental farms. It has been found that about 52-57% of CO2 savings are due to the pellets used, 34-42% to the solar heat collectors and about 9% to the recuperated heat from the produced milk.

Evaluation of some technological properties of Caucasian ram wool

D. Pamukova1*, G. Staykova2, N. Stancheva2, D. Panayotov1

1Department of Animal Science – Ruminant Animals and Dairy Science, Faculty of Agriculture,Trakia University, 6000 Stara Zagora, Bulgaria 2Agricultural Institute, 3 Simeon Veliki, 9700 Shumen, Bulgaria

(Manuscript received 10 September 2017; accepted for publication 17 November 2017)

Abstract. The aim of the study was to establish the levels of the main selection traits which determine the technological wool production in the rams from the breed of Caucasian merino sheep. The study included a total of 126 rams at 18 months of age from Caucasian merino breed. To determine the fibre diameter, a total of 252 wool samples from two parts of the body (sideandleg) were analyzed.For laboratory examination of staple lengt handcrimp of wool, a total 36 wool samples (from the side and the leg) were studied. The rams from Caucasian breed had a very good topographic equality of fiber thickness and staple length. The average fiber diameter of the side was 21.98μm (with variation from 21.71μm to 22.30 μm) and the leg was 23.05μm (with variation from 22.76μm to 23.34μm).The wool`s fineness in the fleecewas 64’s quality in 76.98% of the samples, which characterized it as a fine merinowool.The number of crimps per 1 cm in the rams was an average of 5.07 nrs. on the side and 4.46 nrs. on the leg and in the rams at 18 months of age – 5.26 nrs. and 4.82 nrs., respectively.

Effect of the herbicide treatment dose on the weed infestation in common winter wheat

Z. Petrova*

Dobrudzha Agricultural Institute, 9520 General Toshevo, Bulgaria
(Manuscript received 10 June 2017; accepted for publication 24 October 2017)

Abstract. The aim of this investigation was to determine the effect of the treatment dose of herbicides on the weed infestation in common winter wheat. The investigations were carried out during 2015 –2016 at Dobrudzha Agricultural Institute (DAI) – General Toshevo. The following herbicides were used: Derby super WG (33 g/ha; 66 g/ha; 132 g/ha), Secator ОD (100 ml/ha; 200 ml/ha; 400 ml/ha), Ergon WG (50 g/ha; 100 g/ha; 200 g/ha), Granstar super 50SG (40 g/ha; 80 g/ha; 160 g/ha), Lintur 70WG (150 g/ha; 300 g/ha; 600 g/ha) and Mustang 306.25 СК (800 ml/ha; 1600 ml/ha; 3200 ml/ha) from the group of sulfunylureas with various mechanism of action. The preparations were applied at three doses – optimal, double and quadruple, at stage 29 (according to Zadoks et al., 1974) of common winter wheat cultivars Dragana, Zlatitsa and Kalina. The herbicide effect was determined by the quantitative weight method and evaluated by the EWRS scale. Regardless of the used dose and the cultivar, Derby super WG, Secator OD, Lintur 70WG and Mustang 306.25СК had highest efficiency (100%) against the following investigated weeds: Sinapis arvensis L., Matricaria chamomilla L., Anthemis arvensis L., Galium tricorne (Stock.), Consolida orientalis (J. Gay) and Cirsium arvensis L. Ergon WG and Granstar super 50SG had 100% efficiency against Sinapis arvensis L., Matricaria chamomilla L. and Anthemis arvensis L. and lower effect (90-94%) on Galium tricorne (Stock), Consolida orientalis (J. Gay) and Cirsium arvensis L.