Seasonality in the reproductive activity of male chinchillas on a breeding farm in the climatic conditions of southern Poland

2017 ◽  
Vol 13 (4) ◽  
pp. 17-27
Author(s):  
Olga Szeleszczuk ◽  
Aleksandra Kowalczyk ◽  
Alicja Satoła
Keyword(s):  
Reproductive Potential ◽  
Reproductive Activity ◽  
Climatic Conditions ◽  
Low Fertility ◽  
The Mean ◽  
Foundation Stock ◽  
Modern Breeding ◽  
The Impact ◽  
Strict Selection ◽  
Selection Of

Farmed chinchillas continue to have very low fertility and prolificacy, although the reproductive potential of females is much higher and can be exploited. An increasing number of studies deal with the specific nature of reproduction in this species, with particular focus on female fertility. However, there is a lack of analyses and studies of males. Therefore, this study has attempted to determine the impact of the season of the year on the reproductive activity of male chinchillas and on the results of their use for breeding in the period from January 1991 to December 1996. The analysis was conducted on farmed animals on one of the largest farms in Poland. The farm was established in 1991 with an initial foundation stock of about 150 females and 25 males. Breeding was based on animals imported from a reputable farm in Germany, from which modern breeding technologies were adopted as well. Polygamous breeding with 6 females per male is used. Sexual activity was varied between years. Taking into account the entire foundation stock, an average of 8.15 litters and 14.77 pups were obtained per male per year. Analysis of five selected males revealed higher values: the mean number of litters ranged from 7.13 to 11.8 and the litter size ranged from 1.9 to 2.59. Thus, better utilization of males for breeding is possible on chinchilla farms. The system of keeping a male with many females at the same time enables strict selection of males.

scholarly journals Evaluation of Matured Larval Weight and Larval Duration of New Breeding Lines of Bombyx mori L

2021 ◽  
Vol 8 (10) ◽  
pp. 7-16
Author(s):  
Manjula A. C ◽  
Jenifer Lolita. C ◽  
Shubha Shubha ◽  
Prathibha K.Y ◽  
Keshamma E
Keyword(s):  
Bombyx Mori ◽  
Climatic Conditions ◽  
Sampling Errors ◽  
Random Drift ◽  
Breeding Lines ◽  
Anova Table ◽  
The Mean ◽  
Bombyx Mori L ◽  
Mulberry Silkworm ◽  
Selection Of

We planned to conduct this study with the main aim to develop bivoltine breeds for our tropical climatic conditions by using silkworm breeds with known genetic backgrounds (KA, NB18 and PM) in various hybrid combinations and incorporating them over generations, followed by backcrossing and adequate selection of different generations with the objective of profitability and productivity. The isolated Bivoltin lines (R1 and R2) were reared with their parental races at different times of the year to evaluate their stability in the expression of commercial traits. For the present breeding program, the purebred Bivoltine Kalimpong-A (KA), which spin white oval cocoons, New Bivoltine18 (NB18) white cocoons with rotating dumbbells and Multivoltine Pure Mysore (PM), the yellow pointed cocoons of the mulberry silkworm Bombyx mori L., Selected. One-way and three-way crosses were made using the above three breeds. The first single cross comprised KA females and PM males. The second unique cross comprised NB18 females and PM males. Selection was performed at the egg, larva, pupal, and cocoon stages over the course to determine the desired traits. The offspring of F from the respective crosses were backcrossed with their respective bivoltine males to improve commercial traits. Heterosis in the F1 generations of crosses, including NB18 and PM, was determined by the mean score of the parents (MPV) and the best score of the parents (BPV). A significant test for heterosis was performed using a standard ANOVA table. Based on the results of our study, it was found that the performance of the characters, viz. The weight of mature larvae and the duration of the larvae over generations do not simply increase or decrease regularly, but fluctuate irregularly. The reason for this variation may be due to random genetic drift, sampling errors in estimating generational means, selection pressures, and environmental factors. Therefore, inbreeding variations due to random drift and sampling errors could be reduced by increasing the number sampled and selected.

scholarly journals Selection of shrimp breeders free of white spot syndrome and infectious hypodermal and hematopoietic necrosis

2011 ◽  
Vol 46 (5) ◽  
pp. 530-536 ◽  
Author(s):  
Carlos Cesar de Mello Junior ◽  
Gael Yvan Leclercq Delsol ◽  
Emmerik Motte ◽  
Virna Alexia Cedeño Escobar ◽  
Pedro Filipe Rey ◽  
...  
Keyword(s):  
Nested Pcr ◽  
White Spot Syndrome Virus ◽  
Climatic Conditions ◽  
White Spot ◽  
Necrosis Virus ◽  
Chasmagnathus Granulata ◽  
The Mean ◽  
White Spot Syndrome ◽  
Sexually Mature ◽  
Selection Of

The objective of this work was to select surviving breeders of Litopenaeus vannamei from white spot syndrome virus (WSSV) outbreak, adapted to local climatic conditions and negatively diagnosed for WSSV and infectious hypodermal and hematopoietic necrosis virus (IHHNV), and to evaluate if this strategy is a viable alternative for production in Santa Catarina, Brazil. A total of 800 males and 800 females were phenotypically selected in a farm pond. Nested-PCR analyses of 487 sexually mature females and 231 sexually mature males showed that 63% of the females and 55% of the males were infected with IHHNV. Animals free of IHHNV were tested for WSSV, and those considered double negative were used for breeding. The post-larvae produced were stocked in nine nursery tanks for analysis. From the 45 samples, with 50 post-larvae each, only two were positive for IHHNV and none for WSSV. Batches of larvae diagnosed free of virus by nested-PCR were sent to six farms. A comparative analysis was carried out in growth ponds, between local post-larvae and post-larvae from Northeast Brazil. Crabs (Chasmagnathus granulata), blue crabs (Callinectes sapidus), and sea hares (Aplysia brasiliana), which are possible vectors of these viruses, were also evaluated. The mean survival was 55% for local post-larvae against 23.4% for post-larvae from the Northeast. Sea hares showed prevalence of 50% and crabs of 67% of WSSV.

scholarly journals Perspective sample of root chicory

2019 ◽  
pp. 159-161
Author(s):  
O. M. Vyutnova ◽  
T. Yu. Polyanina ◽  
I. A. Novikova
Keyword(s):  
Raw Materials ◽  
Climatic Conditions ◽  
Raw Material ◽  
Root Crop ◽  
Root Crops ◽  
Early Maturing ◽  
New Varieties ◽  
High Yields ◽  
The Impact ◽  
Selection Of

Relevance. One of the types of agricultural raw materials for the food industry is the root chicory, the product from the roots of which is produced in pure form, as well as is an important component in the production of tea and coffee drinks, confectionery. Its value is determined by the content in the roots of inulin, fructose, intibin and chicory. Despite the great economic importance and economic profitability of chicory cultivation, in recent years, the local processing industry is not provided with this type of raw material and is forced to buy the product from dried root crops in other countries, such as Ukraine, Italy and India. Modern agricultural production is in dire need of new varieties of root chicory, combining high yields and chemical and technological qualities, having the form of a root crop suitable for mechanized harvesting, and adapted to cultivation in soil and climatic conditions of the Non-chernozem zone. Purpose of work: to assess the nature of the impact of ultraviolet radiation in the time mode on watermelon seeds using cytogenetic analysis.Material and methods. The article describes the results of the test in the control nursery of a new sample of chicory root with 0428 selection of Rostov OSC.Results. As a result of breeding work, a promising sample of root chicory. It was isolated early maturing, with high yields and economically valuable properties, root crop truncated, suitable for mechanized harvesting by commercially available machines. 

scholarly journals Perspective sample of root chicory

2019 ◽  
pp. 159-161
Author(s):  
O. M. Vyutnova ◽  
T. Yu. Polyanina ◽  
I. A. Novikova
Keyword(s):  
Raw Materials ◽  
Climatic Conditions ◽  
Raw Material ◽  
Root Crop ◽  
Root Crops ◽  
Early Maturing ◽  
New Varieties ◽  
High Yields ◽  
The Impact ◽  
Selection Of

Relevance. One of the types of agricultural raw materials for the food industry is the root chicory, the product from the roots of which is produced in pure form, as well as is an important component in the production of tea and coffee drinks, confectionery. Its value is determined by the content in the roots of inulin, fructose, intibin and chicory. Despite the great economic importance and economic profitability of chicory cultivation, in recent years, the local processing industry is not provided with this type of raw material and is forced to buy the product from dried root crops in other countries, such as Ukraine, Italy and India. Modern agricultural production is in dire need of new varieties of root chicory, combining high yields and chemical and technological qualities, having the form of a root crop suitable for mechanized harvesting, and adapted to cultivation in soil and climatic conditions of the Non-chernozem zone. Purpose of work: to assess the nature of the impact of ultraviolet radiation in the time mode on watermelon seeds using cytogenetic analysis.Material and methods. The article describes the results of the test in the control nursery of a new sample of chicory root with 0428 selection of Rostov OSC.Results. As a result of breeding work, a promising sample of root chicory. It was isolated early maturing, with high yields and economically valuable properties, root crop truncated, suitable for mechanized harvesting by commercially available machines. 

scholarly journals Optimization of the PNG Law for a Dual-Spin Mortar with Fixed Canards

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Pengfei Liu ◽  
Hongsong Cao ◽  
Shunshan Feng ◽  
Hengzhu Liu ◽  
Lifei Cao
Keyword(s):  
Empirical Method ◽  
Impact Point ◽  
Gravity Compensation ◽  
Proportional Navigation ◽  
Squared Error ◽  
Intelligent Optimization Algorithm ◽  
The Mean ◽  
Optimization Schemes ◽  
The Impact ◽  
Selection Of

The limited instantaneous overload available and the curved trajectory lead to adaptivity problems for the proportional navigation guidance (PNG) of a guided mortar with a fixed-canard trajectory correction fuze. In this paper, the optimization of a PNG law with gravity compensation is established. Instead of using the traditional empirical method, the selection of the proportional navigation constants is formulated as an optimization problem, which is solved using an intelligent optimization algorithm. Two optimization schemes are proposed for constructing corresponding optimization models. In schemes 1 and 2, the sum squared error between the impact point and target and the circular error probability (CEP), respectively, are taken as the objective function. Monte Carlo simulations are conducted to verify the effectiveness of the two optimization schemes, and their guidance performance is compared through trajectory simulations. The simulation results show that the impact point dispersion can be efficiently reduced under both proposed schemes. Scheme 2 achieves a lower CEP, which is approximately 2.9 m and 2.4 times smaller than that achieved by scheme 1. Moreover, the mean impact point is closer to the target.

scholarly journals Including operational data in QMRA model: development and impact of model inputs

2008 ◽  
Vol 7 (1) ◽  
pp. 77-95 ◽  
Author(s):  
Kenza Jaidi ◽  
Benoit Barbeau ◽  
Annie Carrière ◽  
Raymond Desjardins ◽  
Michèle Prévost
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Model ◽  
Model Development ◽  
Microbial Risk ◽  
Relative Risks ◽  
The Mean ◽  
Log Normal ◽  
Simplified Calculation ◽  
The Impact ◽  
Selection Of

A Monte Carlo model, based on the Quantitative Microbial Risk Analysis approach (QMRA), has been developed to assess the relative risks of infection associated with the presence of Cryptosporidium and Giardia in drinking water. The impact of various approaches for modelling the initial parameters of the model on the final risk assessments is evaluated. The Monte Carlo simulations that we performed showed that the occurrence of parasites in raw water was best described by a mixed distribution: log-Normal for concentrations > detection limit (DL), and a uniform distribution for concentrations < DL. The selection of process performance distributions for modelling the performance of treatment (filtration and ozonation) influences the estimated risks significantly. The mean annual risks for conventional treatment are: 1.97E−03 (removal credit adjusted by log parasite = log spores), 1.58E−05 (log parasite = 1.7 × log spores) or 9.33E−03 (regulatory credits based on the turbidity measurement in filtered water). Using full scale validated SCADA data, the simplified calculation of CT performed at the plant was shown to largely underestimate the risk relative to a more detailed CT calculation, which takes into consideration the downtime and system failure events identified at the plant (1.46E−03 vs. 3.93E−02 for the mean risk).

scholarly journals The degree of ripening of the grapevine in the varieties of selection of National Scientific Centre ‟Institute of viticulture and wine-making after V.YE. Tairovˮ in the conditions of the northern part of the Forest-steppe of Ukraine

2020 ◽  
Vol 11 (3) ◽  
pp. 105-114
Author(s):  
O. S. Vasylenko ◽  
◽  
T. E. Kondratenko ◽  
Keyword(s):  
Weather Conditions ◽  
Growing Season ◽  
Climatic Conditions ◽  
Forest Steppe ◽  
Winter Conditions ◽  
The Mean ◽  
Primary Fluorescence ◽  
Wintering Conditions ◽  
Grape Varieties ◽  
Selection Of

Strong growth of shoots and ripening of grape fruits do not give grounds for claiming that the variety is in accordance with the climatic conditions of a certain area. Only a well-ripe vine can withstand severe winter conditions. The purpose of the study is to determine the degree of maturation of the vine in grape varieties of Odessa breeding grown in the northern part of the Forest-steppe, and to identify among them the most prepared for wintering conditions in the area. The degree of maturation of the vine was determined during 2018–2019 in the autumn before the cover of grape plants by the method of primary fluorescence using a microscope MBS-2 with fluorescent illuminator OI-18 and by the method of N. Matuzok. Studies have shown that the degree of ripening of the grapevine depends on the weather conditions during the growing season and varietal characteristics of the plants. Weather conditions during the years of study contributed to the good maturation of the shoots of grapes of all varieties except Kometa and Zahadka. The first had a characteristic brown color of the mature bark along the entire length of the shoot. When bending the vine in its upper part of the characteristic cracking of the bark was not in the varieties Kometa, Zahadka, Yarylo and Muskat odeskyi. The highest degree of ripening of shoot tissues was noted in the lower zone of the vine in the Aromatnyi, Kardyshakh, Kishmish tayirovskij. In the middle zone of shoots, the highest degree of maturation of the felema was found in the variety Kardyshakh, and in the upper part of the shoot, in the variety Aromatnyi. The highest conditional coefficient of maturation (Kv) of the tissues of the vine in the fifth internode is defined in the varieties Aromatnyi and Kyshmysh tairovskyi (0.90), the mean in the variety Kardyshakh (0.88), and the lowest in the variety Kometa (0.56). Based on the data obtained from the results of complex studies, it was found that the varieties Aromatnyi, Kyshmysh tairovskyi and Kardyshakh are the most prepared for wintering in the northern part of the Forest-steppe.

scholarly journals High-end climate change impact on European water availability and stress: exploring the presence of biases

2015 ◽  
Vol 12 (7) ◽  
pp. 7267-7325 ◽  
Author(s):  
L. V. Papadimitriou ◽  
A. G. Koutroulis ◽  
M. G. Grillakis ◽  
I. K. Tsanis
Keyword(s):  
Global Warming ◽  
Bias Correction ◽  
Climate Models ◽  
Climate Model ◽  
Water Cycle ◽  
Order Of Magnitude ◽  
Change Impact ◽  
The Mean ◽  
The Impact ◽  
Selection Of

Abstract. Climate models project a much more substantial warming than the 2 °C target making higher end scenarios increasingly plausible. Freshwater availability under such conditions is a key issue of concern. In this study, an ensemble of Euro-CORDEX projections under RCP8.5 is used to assess the mean and low hydrological states under +4 °C of global warming for the European region. Five major European catchments were analyzed in terms of future drought climatology and the impact of +2 vs. +4 °C global warming was investigated. The effect of bias correction of the climate model outputs and the observations used for this adjustment was also quantified. Projections indicate an intensification of the water cycle at higher levels of warming. Even for areas where the average state may not considerably be affected, low flows are expected to reduce leading to changes in the number of dry days and thus drought climatology. The identified increasing or decreasing runoff trends are substantially intensified when moving from the +2 to the +4 °C of global warming. Bias correction resulted in an improved representation of the historical hydrology. It is also found that the selection of the observational dataset for the application of the bias correction has an impact on the projected signal that could be of the same order of magnitude to the selection of the RCM.

scholarly journals Enzymatic Activity of Soil under Spelt Grown in An Organic Farming System in Poland’s Temperate Climate

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 930 ◽  
Author(s):  
Barbara Filipek-Mazur ◽  
Katarzyna Pużyńska ◽  
Monika Tabak ◽  
Stanisław Pużyński
Keyword(s):  
Enzymatic Activity ◽  
Organic Farming ◽  
Farming System ◽  
Climatic Conditions ◽  
Cold Climate ◽  
Low Fertility ◽  
Soil Types ◽  
Temperate Climate ◽  
Organic System ◽  
The Impact

Wheat spelt is a very valuable plant, especially in organic farming. Its high nutritional values combined with low soil and climate requirements increase the interest in growing spelt in various soils. Spelt can be grown in different soil types, including sandy, wet, poor, non-draining and low-fertility soils. It is well adapted to cold climate. Compared to common wheat, it requires less nutrients and is more competitive against weeds. Activities of enzymes in soil under winter spelt have not been studied yet. We sought to determine whether the choice of varieties will also shape the enzymatic activities in different soil types and whether these activities will be the same under different climatic conditions of 2007, 2010 and 2013 year. The aim of this field experiment was to assess the impact of growing different winter spelt varieties (Oberkulmer Rotkorn, Franckenkorn, Schwabenkorn, Ostro) on the enzymatic activity on two different soil complexes. In the years 2007–2013, two three-year rotations of the experiment were carried out (the first ended in 2010 and the second in 2013). Spelt was cultivated in an organic system. Physicochemical properties of the two different types of soil after three and six years of the experiment were compared to the soil properties before the experiment. The catalase activity ranged between 3.33 and 6.75 µmol H2O2 g−1 d.m. min.−1, the dehydrogenase activity ranged between 1.6 and 87.7 nmol TPF g−1 d.m. 24 h−1, and the arylsulfatase activity ranged between 37.5 and 157 µmol pNF g−1 d.m. h−1. The enzymatic activity in the soil depended on the type of soil (as a rule, the activity was higher in a stagnic luvisol than in a haplic cambisol) and on the spelt variety (although no variety had a clear beneficial effect on the activities of all enzymes). Spelt cultivation in an organic system led to an increase of enzymatic activity in a stagnic luvisol, but not always in a haplic cambisol soil type.

L'enneigement hivernal : un facteur de variation du recrutement chez l'isard (Rupicapra pyrenaica pyrenaica)

2002 ◽  
Vol 80 (7) ◽  
pp. 1306-1312 ◽  
Author(s):  
J -P Crampe ◽  
J -M Gaillard ◽  
A Loison
Keyword(s):  
Population Dynamics ◽  
Climatic Conditions ◽  
Snow Accumulation ◽  
Yearly Variation ◽  
Rupicapra Pyrenaica ◽  
Winter Snow ◽  
Population Recruitment ◽  
The Mean ◽  
Mountain Ungulates ◽  
The Impact

To assess the relationships between winter climatic conditions and population dynamics of mountain ungulates, we monitored over the long term an unhunted isard (Rupicapra pyrenaica pyrenaica) population living in the Pyrénées National Park. We used general linear modelling to assess (i) the influence of the observation date (between November and April) of the transect sampled and of the year on population recruitment (proportion of females 2 years of age and older with kids at heel) and (ii) the impact of snow accumulation during winter (cumulated snow fall from November to April) on kid mortality. As expected, the mean number of kids per female decreased over the observation period. The mean number of kids per female showed marked among-year differences in initial recruitment (measured on 31 October) as well as in kid mortality (measured as the decrease in recruitment between 31 October and 31 March). This model accounted for 80% of the variability observed in the field data. Among-year differences in snow accumulation accounted for most (86%) of the yearly variation observed in kid mortality. Our study demonstrates that winter snow may severely affect juvenile survival, and thereby population dynamics of mountain ungulates.

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