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Shumen, Bulgaria

Yotov S.,Trakia University | Atanasov A.,Trakia University | Ilieva Y.,Agricultural Institute
Asian Pacific Journal of Reproduction

Objective: The aim of the present study was to assess therapeutical effect of modified Ovsynch and PRID estrus synchronization protocols in Bulgarian Murrah buffalo with inactive ovaries during the low-breeding season. Methods: The study was carried out in 46 Bulgarian Murrah buffaloes with small inactive ovaries established by two consecutive transrectal ultrasonographies on Day 40 and 50 postpartum. At the start of the therapy the buffaloes were randomly divided into three groups. Group I (. n=18) was treated by PRID-based protocol; Group II (. n=18) was treated by Ovsynch based protocol and Group III (control; n=10) was injected intramuscular with saline at the same days as in the first two groups and fertile bull was introduced after that. The animals in the different groups were submitted to ultrasound examination at day of artificial insemination or bull introduction. Ovulation was determined 7 days post insemination by ultrasound. The pregnancy diagnosis was done 30 days after insemination. Mean diameter of the largest follicles at the start of therapy and the day of AI was registered. In the hormonal treated buffaloes estrus clinical sings, ovulation rate and pregnancy rate after AI were determined. In the control group pregnancy rate after spontaneous estrus was established. The mean diameter of the largest follicles determined on Days 40 and 50 after calving was not over 9 mm for all buffaloes. Results: At day of AI the average diameters of the preo-vulatory follicles in PRID and Ovsynch treated buffaloes were significantly (. P<0.01) greater than these on Day 0. The cases of a clear uterine mucus discharge during the induced estrus were significant more (. P<0.05) for Group I (94.4%) than Group II (66.7%). The pregnancy rate after AI (56.6% and 38.8%) in PRID and Ovsynch program was significant higher (. P<0.05) than pregnancy rate after spontaneous estrus (10%) in the control group. Conclusions: the treatment of buffalo ovarian inactivity could start on Day 50 postpartum. The PRID and Ovsynch estrus synchronization protocols by substitution of the second GnRH with hCG, could be successfully used for therapy of Bulgarian Murrah buffaloes with inactive ovaries during the low-breeding season. © 2012 Hainan Medical College. Source

Morgounov A.,CIMMYT | Haun S.,CIMMYT | Lang L.,Agricultural Institute | Martynov S.,Vavilov Institute | Sonder K.,CIMMYT

Key weather parameters (monthly minimum and maximum temperature, precipitation) were extracted for 35 winter wheat breeding sites in central Asia, eastern Europe and Great Plains of USA from 1961 to 2009. Autumn and winter warming happened gradually, over a long period of time, but mostly before 1991. Climate changes after 1991 were mainly expressed through higher temperatures in spring, May, and June. Clear regional differences were observed for air temperature variation. Breeding sites in the USA seemed to be least subjected to climate change. There were no significant linear trends in yearly, seasonal, or monthly precipitation. Changing climates expressed through rising temperatures during critical stages of winter wheat development have already negatively affected yield gains in several countries, especially in eastern Europe. There are some positive changes associated with warmer winters, which may not require additional investment in traits associated with winter survival. Rising temperatures in spring are of particular concern since their effect on yield is negative in some regions. They certainly accelerate wheat development and shift heading to earlier dates. The interaction of higher temperatures in spring with the rate of crop development and yield is a fundamental issue which requires research. Rising temperatures in June are detrimental for grain development and filling and heat tolerance warrants high priority in breeding programs. © 2013 Springer Science+Business Media Dordrecht. Source

Tanova K.,University of Shumen | Georgieva-Andreeva M.,Agricultural Institute
Carpathian Journal of Food Science and Technology

We have analysed the influence of agrimony water-ethanol extract on the pathogenicity, the aggressiveness and growth of the pathogen the agent of the Rhizoctonia solani Kuhn in fodder beet, sort Pliska. In order to determine the influence of the extract on the pathogenicity and aggressiveness of the pathogen we conduct laboratory examination with root crops from the laboratory fields of the institute preliminary processed and non-processed with 10% water solution from extract, injured, not infected and infected with the pathogen. It is established that the preliminary processing decreases Rhizoctonia solani Kuhn with 0.5 grades, it delays the pathogen penetration with 0.5mm/25h and the relative quantity of putrefied mass with 3.5mg/100g. It suppresses the pathogen growth - for seven days the colonies diameter decreases with 2sm, and the dry mycelium mass with 1.5%. Source

Szostak B.,Lublin University of Life Sciences | Apostolov A.,Agricultural Institute
Bulgarian Journal of Agricultural Science

The aim of the study was to evaluate the degree of soil contamination by biogenic elements on a pig farm. The study was conducted on a pig farm in the Lublin voivodeship. The pigs were housed in group pens with straw. Soil samples were collected from the following locations: the dunghill at distances of 5 and 10 m and the fattening house at distance of 5 and 10 m. Samples were collected from three layers, every 20 cm, to a depth of 60 cm. Following mineralization of the samples in fuming nitric and perchloric acid, determinations were made of total nitrogen, phosphorus, and potassium. No increase in these biogenic elements was found in the soil from the farm with respect to their natural content in the soil. Total nitrogen and available phosphorus and potassium in the soil varied by the interaction of the soil layer with the sampling point, distance, and manure storage site. The results of the study confirm that biogenic elements can migrate deep into the soil profile, which in the case of improper manure storage can lead to contamination of the soil and groundwater, particularly by nitrogen and phosphorus compounds. © 2014, National Centre for Agrarian Sciences. All Rights Reserved. Source

Szostak B.,Lublin University of Life Sciences | Apostolov A.,Agricultural Institute
Bulgarian Journal of Agricultural Science

The aim of the study was to determine the effect of lifetime daily weight gain and body weight at slaughter on the size of ovaries in gilts. The study was carried out on 105 gilts that were crossbred from Polish White Landrace sows and Polish Large White boars and raised on breeding farms. The gilts were divided into three groups according to their growth rate: I-gilts with lifetime daily weight gain of 400-500 g; II-501-600 g; and III-601-700 g. To determine the effect of body weight at slaughter on the condition of the ovaries and on the number of corpora lutea on the ovaries, the gilts were divided into four groups: I-80-90 kg; II-91-100 kg; III-101-110 kg; and IV-111-120 kg. The growth rate of the gilts, measured as lifetime daily weight gain, was found to significantly affect the development of the ovaries (dimensions and weight). The largest parameters were noted for the ovaries of gilts with daily weight gain in the 400-500 g range. The weight of the gilt at slaughter significantly influenced the weight of the ovaries. The greatest ovary weight was observed in the gilts from the 111-120 kg weight group. © 2014, National Centre for Agrarian Sciences. All rights reserved. Source

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