Effect of Аrtemisia annua L. extract on growth performance, biochemical blood parameters and meat quality of rainbow trout (Oncorhynchus mykiss W.), cultivated in recirculating system

  1. Koshinski*


Department of Biology and Aquaculture, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria


DOI: 10.15547/ast.2018.03.051

(Manuscript received 30 June 2018; accepted for publication 20 August 2018)


Abstract. Medicinal herbs can be used as feed additives to improve animal growth performance and to optimize physiological processes. The purpose of this study was to trace growth performance, meat quality and biochemical blood parameters (glucose, urea, creatinine, total protein, albumin, ASAT, ALAT, Ca, P, Mg, triglycerides, cholesterol) of rainbow trout (Oncorhynchus mykiss W.), fed with additive sweet wormwood (Аrtemisia annua L.) extract. In a recirculation system at the Aquaculture Base of the Faculty of Agriculture at Trakia University, a control group (no added) and an experimental (with added 204 mg.kg-1 of sweet wormwood extract) option were set, each of them with two replicates and mean initial weight of fish 13.32±3.07g and 13.37±2.76g, respectively. Forty specimens of rainbow trouts in good health condition were placed in each tank and cultivated for 60 days. At the end of the experiment average final weight, specific growth rates, feed conversion ratio, meat quality and blood biochemical parameters were calculated. Trouts from the experimental group, fed with supplement had 5.5% higher average final weight compared to this one of individuals from the control (P<0.05). The blood biochemical parameters glucose, ASAT and ALAT in control variant were higher compared to the values of that parameters of the fish from the experimental group (P>0.05). Electrolytes of blood such as phosphorus (P) had higher level in the experimental group (P>0.05) compared to the control group. Better growth performance and blood parameters were measured in trout fed sweet wormwood supplement.

Effect of feeding program for first two months after birth of female calves on growth, development and first lactation performance

G. Ganchev*, E. Yavuz, N. Todorov

Departmet of Morphology, Physiology and Animal Nutrition, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria

Abstract. The aim of this paper was to review the available literature examining the relationship between milk feeding method of dairy calves during preweaning period on their growth and development. We conclude that delayed and inadequate colostrum feeding can result in increased morbidity and mortality. The higher level of milk feeding for dairy calves has the potential to increase growth rates during the preweaning period, to reduce time needed to reach a necessary body weigh at first calving and improve milk yield at first calving. Providing more milk however, may decrease intake of solid feed during the period of feeding milk. So far is it not clear, whether it is possible to combine intensive liquid feeding with sufficient dry feed intakes at weaning to continue normal growth of calves; otherwise, what is the level of milk feeding allowing small, or even to avoid, slump in growth at weaning. It is not known what level of milk feeding plus free access to starter allows obtaining a high level of live body gain during the first two months necessary for enhancing future milk yield of heifer calves. Additional studies are needed to clarify effect of different levels of milk feeding and scheme of feeding female dairy calves on growth rate, development, feed efficiency and health status during pre weaning and post weaning period.


Effect of the length of the interstock on the growth and reproductive aspects of sweet cherry cultivar Biggareau Burlat

P. Kaymakanov*

Department of Fruit Growing, Faculty of Viticulture and Horticulture, Agricultural University Plovdiv, 12 Mendeleev, 4000 Plovdiv, Bulgaria

Abstract. In the period 2012 – 2013 the influence of 3 interstocks on growth and fruit bearing of the sweet cherry cultivar Biggareau Burlat grafted on Prunus mahaleb L. – P1 seedling rootstock was tested. As interstocks were used Gisela 5, the sour cherry cultivar North Star and the Hybrid 2/10, each of them with length 10 and 30 cm. The trees were planted in March 2006 with planting distance 6.0 x 4.5 m and were grown without irrigation and training. The sweet cherry cultivar Stella which was planted in adjacent rows was used for pollination of Biggareau Burlat. It was established that under the influence of the longer intesrock the trunk size was reduced in the area of the rootstock and the interstock itself. The trunk size was bigger in the area of the scion. The differences were more pronounced where Gisela 5 was used. The longer interstock induced weaker growth of the trees grafted on Gisela 5 and reduced the crown volume. The trees with the longer interstock have larger number of blossoms per linear metre of two-year-old wood, but with lower percent of fruit set. Despite the lower fruit set the trees with the longer interstock have higher cumulative yield compared to the crown volume and the differences to Gisela 5 are proved.


Growth and fruiting of the apple variety Braeburn 7926 grafted on M9 Pajam2 and MM106

G. Dobrevska*
Department of Fruit-Growing, Faculty of Viticulture and Horticulture, Agricultural University Plovdiv, 12 Mendeleev, 4000 Plovdiv, Bulgaria
Abstract. The growth and reproductive characteristics of the apple variety Braeburn 7926 grafted on two rootstocks with different growth potential – M9 Pajam2 and MM106 is studied. Both rootstocks induce growth manifestations on the variety which are in compliance with their commonly accepted characteristics in fruit growing – proven higher values of the cross – section area of the stem, as well as, in respect to the volume of the crown of the grafted variety are recorded in a combination with the semi – weakly growing rootstock MM106 in comparison to the weakly – growing M9 Pajam2. The combination Braeburn 7926/M9 Pajam2 is more productive during the first year of the observed period and this is due to the earlier fruitgrowing stage of the variety which is affected by the weakergrowing rootstock. The yields are slowly declining in the following years in comparison to the combination Braeburn 7926/MM106 because of the reflected smaller crowns volume affected by the weaker rootstock. The productivity coefficient shows higher values when rootstock M9 Pajam2 is used only during a part of the observed period. A higher planting density can be recommended when the weaker growing sort-rootstock combination is applied for a more rational usage of the vegetative area.