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Clek S.,University of Veterinary and Animal Sciences | Petkova M.,Agricultural Academy
Bulgarian Journal of Agricultural Science | Year: 2016

This experimental research was carried out to determinate phenotypic correlations among some body measurements of Malya sheep and prediction of body weight from these measurements. By using body measurements of total 316 heads that included male, female, adult and yearlings, phenotypic correlations among some body measurements (wither height, rump height, back height, rump length, rump width, front cannon bone circumference, body length, chest circumference, chest depth, chest length, chest width, tail length, tail-tarsal joint distance, tail width, head length, head circumference, head width, distance between ears, ear length and ear width) were estimated and relationships between body weight and chosen body measurements were investigated. Phenotypic correlation between body weight and all body measurements was favorable and statistically significant (P<0.001). Increase in body weight will occur parallel to the growth of all parts of the body. The Pearson correlation coefficient between body weight with chest circumference, rump height, rump width, body length, chest length, head circumference, tail-tarsal joint distance and tail width were 0.86, 0.56, 0.57, 0.76, 0.70, 0.63, 0.30 and 0.46, respectively. The highest phenotypic correlation was between body weight and chest circumferences. It can be concluded that heart circumference is the most appropriate parameter to estimate body weight of sheep. More confident predictions can be made by using the chest circumference together with other measurements. The regression model for predicting body weight was estimated by using more variables. © 2016, National Centre for Agrarian Sciences. All rights reserved.


Clek S.,University of Veterinary and Animal Sciences | Petkova M.,Agricultural Academy
Bulgarian Journal of Agricultural Science | Year: 2016

This experimental research was carried out with Malya sheep to determinate the effects of age and gender on head measurements. Head measurements were taken from 55 male and 261 female sheep from 1 year-old to 5 or more years-old. Head length, head circumference, head width, distance between ears, ear length and ear width were estimated as head measurements. The least squares method was used to investigate effects of age and gender on these traits. The least squares method was performed using the General Linear Model (GLM) procedure in Minitab package program for statistical analysis. The means of important subgroups as statistic were compared by using Duncan’s multiple range tests. The least squares for head length, head circumference, head width, distance between ears, ear length and ear width were estimated as 32.59±0.17 cm, 49.00±0.18 cm, 13.06±0.07 cm, 20.48±0.10 cm, 15.44±0.10 cm and 8.64±0.04 cm, respectively. The effect of age and gender on all head area measurements were significant (P<0.05) except for the effect on ear length. It can be said that all head area measurements increased significantly with increasing age and males have anatomically bigger head region measurements than females except for ear length. Having shorter ear measurements of males than females in some age groups can be caused by the big individual differences withn Malya breed sheep, which was obtained as a result of combined crossbreeding. © 2016, National Centre for Agrarian Sciences. All rights reserved.


Vasileva V.,Agricultural Academy | Ilieva A.,Agricultural Academy
Bulgarian Journal of Agricultural Science | Year: 2017

Some physiological parameters (leaflet area, photosynthetic pigments) of subterranean clover, cocksfoot and tall fescue were studied in a field trial in the Institute of Forage Crops, Pleven, Bulgaria (2011-2014). Three subspecies of subclovers – i.e. Trifolium subterraneum ssp. brachycalicinum (cv. Antas), Trifolium subterraneum ssp. yaninicum (cv. Trikkala) and Trifolium subterraneum ssp. subterraneum (cv. Denmark); and two grasses, i.e. cocksfoot (Dactylis glomerata L.) (cv. Dabrava) and tall fescue (Festuca arundinacea Schreb.) (cv. Albena) were grown purely and in mixture (a ratio of grass to subclovers 50:50%). From pure grown subclovers most leaflet area formed Trifolium subterraneum ssp. brachycalicinum (2.11 cm2), followed by Trifolium subterraneum ssp. yaninicum (1.98 cm2) and Trifolium subterraneum ssp. subterraneum (1.42 cm2). For the plastid pigments content subclovers were arranged as follows: Trifolium subterraneum ssp. brachycalicinum (300.18 mg/100 g FW), Trifolium subterraneum ssp. subterraneum (283.53 mg/100 g FW) and Trifolium subterraneum ssp. yaninicum (283.35 mg/100 g FW). Leaflet area of subclover was greater in mixtures with cocksfoot as compared to tall fescue. Total plastid pigments content (chlorophyll a+b and carotenoids) was found be higher in both components of the mixtures of cocksfoot with Trifolium subterraneum ssp. brachycalicinum (by 16.2% and 10.6%, respectively). © 2017, National Centre for Agrarian Sciences. All rights reserved.


Ivanov M.,Agricultural Academy | Roychev V.,Agricultural University of Plovdiv
Bulgarian Journal of Agricultural Science | Year: 2016

Research has been carried out into the characteristics of the inheritance of the trait berry colouring in vine seedlings from F1 progeny of complex interspecies hybrid combinations. It has been found that the cultivars used in the separate crosses are characterized by different genotypes in terms of the studied trait, which leads to the observed great phenotypic diversity. The inheritance of berry colour takes place by monohybrid - dominant and incompletely dominant and dihybrid - epistatic scheme. The genetic analysis and determination of the individual genotype of parent cultivars related to that qualitative trait, present a theoretical possibility for increasing the efficiency of the selection process in vine in accordance with the concrete objective. © 2016, National Centre for Agrarian Sciences. All rights reserved.


Stanev S.,Agricultural Academy | Zagorcheva T.,Bulgarian Academy of Science | Atanassov I.,Bulgarian Academy of Science
Bulgarian Journal of Agricultural Science | Year: 2016

Bulgaria has a near century long tradition in lavender (Lavandula angustifolia Mill) cultivation and essential oil production.Following significant reduction of lavender plantations during the country’s transition period at the end of the last century, the industrial lavender cultivation gained considerable attention and rapid expansion during the last decade.Here we present the main trends of the 21st century developments of the industrial lavender cultivation in Bulgaria.The data of parallel growing and essential oil production of the currently cultivated Bulgarian lavender varieties demonstrate the higher impact of cultivating vegetative propagated varieties instead of seed derived lavender populations.The main directions and challenges of the 21st century lavender growing in the country related to increased lavender cultivation are pointed out.The recent advances in development of lavender genomic resources, molecular markers, comparative analysis of flower volatiles and related opportunities for targeted breeding and marker assisted selection are discussed. © 2016, National Centre for Agrarian Sciences.All rights reserved.


Borisova A.,Agricultural Academy | Kamenova I.,Bulgarian Academy of Science
Bulgarian Journal of Agricultural Science | Year: 2016

Apple, pear and plum trees showing symptoms typical for apple proliferation, pear decline and European stone fruit yellow from Kyustendil region of Bulgaria were analyzed for phytoplasma infection by polymerase chain reaction technology. PCR was performed by the use of specific for Apple proliferation group set (Loewe Phytodiagnostica, Germany) and the protocol recommended by the manufacturers. The results obtained showed the presence of phytoplasmas in 85.0% and 62.0% tested apple and pear trees, respectively and in all tested plum trees. Restriction fragment length polymorphism analysis revealed that apple and pear were infected with apple proliferation and pear decline phytoplasmas, respectively, while European stone fruit yellows was detected in plum trees. Because many trees showed symptoms like those of sampled and analyzed trees, this preliminary assay suggest a high incidence of phytoplasmas from AP group in the surveyed region of the country. © 2016, National Centre for Agrarian Sciences. All rights reserved.


Karadjova O.,Agricultural Academy | Krusteva H.,Agricultural Academy
Bulgarian Journal of Agricultural Science | Year: 2016

The aim of the present investigation was to identify the hemipteran pests of suborder Sternorrhyncha (family Aphididae) and suborders Cicadomorpha, and Fulgoromorpha, on winter triticale Vihren variety and examine the population dynamics of the dominant species during the spring/summer vegetation period in relation to the sowing date and the climatic conditions.The study was carried out during the period 2011–2013 on the experimental fields on four plots of 0.25 ha.Two plots were sown with triticale in September (early sowing) and October (late sowing) each year.A total of 3 species of family Aphididae, 10 species of Cicadomorpha and 1 species of Fulgoromorpha were found in the crop.Sitobion avenae, Philaenus spumarius, Psammotettix provincialis, P.striatus and P.alienus were the most abundant.The abundance of Sitobion avenae was statistically higher in the crop sown in September and can be forecasted using the percentage of attacked stems.The variations in the abundance of Cicadomorpha and Flugoromorpha during the spring vegetation period were more dependent on the climatic conditions than on the sowing date. © 2016, National Centre for Agrarian Sciences.All rights reserved.


Five new species, Petrobius caucasicus sp. n., Trigoniophthalmus presimplex sp. n., T. divnogorski sp. n., T. kislovodski sp. n., and T. adigei sp. n. (Machilidae), are described from the Caucasus. A key to all the known species of the genus Trigoniophthalmus is given. Two subgenera (Trigoniophthalmus s. str., Trigoniocellus subgen. n.) in the genus Trigoniophthalmus are described. 2 + 2 retractile vesicles are present on abdominal segments II-IV in the species of Trigoniocellus subgen. n. and on II-V abdominal segments in Trigoniophthalmus s. str. Analysis of the evolution and phylogenetic relations between the species of the genus Trigoniophthalmus is performed for the first time. The formation of bristletails of the genus Trigoniophthalmus appears to occur in the Caucasian mountain province of the European area, from where they penetrated to the Central European mixed province and the Mediterranean subarea. Among the described species of the genus, T. kislovodski is distinguished by the greatest number of plesiomorphic states of morphological characters. © 2010 Pleiades Publishing, Ltd.


Five new species, Petrobius caucasicus sp. n., Trigoniophthalmus presimplex sp. n., T. divnogorski sp. n., T. kislovodski sp. n., and T. adigei sp. n. (Machilidae), are described from the Caucasus. A key to the identification of all known species of the genus Trigoniophthalmus is given. Two subgenera (Trigoniophthalmus s. str., Trigoniocellus subgen. n.) in the genus Trigoniophthalmus are described. 2 + 2 eversible vesicles are located on II-IV abdominal segments in the species of Trigoniocellus subgen. n. and on II-V abdominal segments in Trigoniophthalmus s. str. The analysis of evolution and phylogenetic relations between species of the genus Trigoniophthalmus is given for the first time. The formation of bristletails of the genus Trigoniophthalmus appears to occur in the Caucasian mountain province of the European area, from where they penetrated to the Central European mixed province and the Mediterranean subarea. Among the described species of the genus, T. kislovodski is distinguished by the greatest number of plesiomorphous states of morphological features.


Bozhinova R.,Agricultural Academy
Bulgarian Journal of Agricultural Science | Year: 2016

The effects of the different phosphorus rates (0; 75 and 225 kg ha-1) on tobacco yield and concentration of macro- and micronutrients in leaves have been studied in a stationary field trial. A long-term fertilizer experiment with continuous tobacco cropping system was established on rendzina soil (Rendzic Leptosol) in 1966. Phosphorus was identified as a factor limiting cured leaf yield in continuous tobacco cropping system, established on a soil with low available P. With the increase of phosphorus fertilization rate the content of the phosphorus and calcium in leaves also increased. Zinc concentration was significantly greater in the lower and middle leaves that received no supplemental P fertilizer compared with those plots that did. Copper content of the leaves decreased with increase of phosphorus fertilizing level from 0 to 75 kg ha-1. Fertilization whit 75 kg P2O5 ha-1 should be considered as optimal for producing high yield of sun-cured leaves. © 2016, National Centre for Agrarian Sciences. All rights reserved.

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