The effect of salt-free - salt diet on the reproductive performance of Ile de France ewes

The aim of the present study was to establish the effect of salt-free - salt diet (SFSD) on the size of antral follicles during salt consumption, the duration of controlled breeding campaign and the ferti¬lities of ewes from the Ile de France breed. Тhe experiment was carried out with 57 ewes, which were divided into 3 groups (19 ewes in each) depending on whether they were subjected to SFSD and their contacts with rams during the first 8 days of the beginning of breeding: Group I – SFSD + ram con-tact; Group II – only SFSD; Group III – no SFSD, only ram contacts. The first day of the salt diet coincided with the first day of ram contacts. Transrectal ultrasound examinations of the ovaries were done on days 1, 2, 3, 5, 6 and 7. The time of manifestation of estrus (in days), pregnancy rate and fecundity were studied. A significant effect of time (P<0.05) and diet (P<0.01) on the size of follicles was established. The onset of the first estrus, the shortest terms of breeding campaign, the fertility and the fecundity results gave us reason to favour the scheme applied to Group II. A stimulatory effect of the diet in that study was demonstrated, but the pattern was different from our previous studies

Agricultural Academy

Abstract Ivanova, T. and E. RaIchEva, 2015. Wool production and some wool properties from ewes from Synthetic population Bulgarian milk. Bulg. J. Agric. Sci., 21: 1076-1079 The aim of the present study was to determine the wool production and some wool properties from ewes from Synthetic population Bulgarian milk. The study was carried out with 25 ewes at age of 18 months and 25 ewes at 2.5 years reared in Institute of animal Science -Kostinbrod. The wool samples were taken from the sides of ewes for laboratory assessment of the fiber thickness. The thickness of the wool was measured for 100 fibres from each nonfat wool sample, in µm, by Lanimetre MP 3, PZo, Poland with enlargement 20. During the shearing of sheep, it was measured the individual quantity of grease wool with accuracy up to 100 g. Samples were taken from different parts of the body in amount of 300 g for determining the yield and preparation of the samples for measurement of the wool&apos;s whiteness. on base of the information for the individual wool production and yield it was calculated the quantity of clean fiber. The whiteness was assessed by photometric methods with Spekol 11 -Carl Zeiss Yena on the base of the measurements of red (X), green (Y) and blue (Z) components of the reflected light from the wool sample. The degree of whiteness, the degree of yellowing and index of yellowing were calculated. The obtained information was analyzed by methods of variation statistics, the effect of age was established by one-way anova. The significance of the influence of the studied factor was established by F-criterion of Fisher. The significance of the differences between means of the studied traits was evaluated by t-criterion of Student. The age of ewes had significant influence on the yield, clean fiber, thickness and whiteness of wool (P &lt; 0.05) (P &lt; 0.001). It was established negative, considerable high, significant correlation coefficients (r = -0.51** ÷ -0.65***) between the whiteness, degree of yellowing and index of yellowing. The ewes with 48 quality of wool had the highest percentage (over 50%)

Agricultural Academy

Abstract RAICHEVA, E., T. IVANOVA and E. KIPRIOTIS, 2009. Test day milk, composition and udder morphology at West Balkan mountain sheep and their F 1 crosses with Chios breed. Bulg. J. Agric.Sci.

Investigation of spin-orbit interaction in AlGaN/GaN heterostructures with large electron density

Magnetotransport phenomena in the high-density two-dimensional electron gas of AlGaN/GaN heterostrutures are investigated. Peculiarities of low- and high-field magnetotransport measurements in the temperature range from 0.3 to 10 K are discussed. The weak localization and antilocalization effects are observed and analyzed. The Rashba constant describing the spin-orbit interaction is extracted from the results of low-field magnetotransport for the structure with 33% aluminum content in the barrier and an electron sheet density of 1.1 x 10(13) cm(-2) and appears to be of 1.01 x 10(-10) eV cm

Efficiency of transrectal ultrasonography for pregnancy diagnosis of Ile de France ewes during the first month of gestation

The aim of the present study was to test transrectal real-time B-mode ultrasonography for pregnancy diagnosis in ewes from the Ile de France breed on day 16, 23 and 30 after fixed-time artificial insemi-nation. The experiment was carried out with 22 multiparous pure-bred Ile de France ewes aged 2–5 years. Diagnosis of pregnancy was based on the presence of enlarged uterine lumen with amniotic fluid and visualisation of embryo. The accuracy (Ac %), sensitivity (Se %) and specificity (Sp %) of the technique were determined. The gestational phase influenced significantly (P<0.01) the accuracy of the transrectal ultrasonography approach for pregnancy diagnosis. At day 16 the accuracy was 50.0%, whereas at day 23 and at day 30 it reached 72.73% and 90.91% respectivel

THE CHARACTERISTIC OF CONTROL DAY MILK AND ITS PROPERTIES IN EWES FROM DIFFERENT BREEDS IN BULGARIA**

**Original scientific paper. The publication is connected to Bulgarian-Greece project fo