Wyniki wyszukiwania - Biblioteka Nauki

1

Potential rate of reproduction for some geographically separate populations of Pseudocalanus spp.

100%

Dzierzbicka-Głowacka L. , Zieliński A.

Oceanologia

|

2004

|

tom No. 46 (1)

65-83

EN

Quantitative expressions are presented describing the potential reproductive rate per individual female of Pseudocalanus spp. in several different waters (not reduced by food limitation) as a function of both temperature and cephalothorax length of females (one equation for each studied region). The calculations were made for some geographically separate populations of Pseudocalanus spp. from southwest Baffin Island, Nova Scotia, Long Island Sound, Scotland, as well as the southern North Sea and its adjacent waters (e.g. the English Channel). On the basis of the findings presented in this work and from other studies, the reproductive rate was computed as the mean number of eggs per sac divided by 1.25 times the embryonic duration at the given temperature. Also computed was the amount of egg matter produced per day as a percentage of body carbon (and dry weight) of female weight for all localities. The relationships for females from the southern North Sea were obtained for "viable eggs", but they should be treated with reserve. A more suitable expression describing egg production in the southern North Sea is the equation for females from the English Channel obtained here. Our assumptions and approximations appear to predict quite well the temperature-length of female dependent daily rates of egg production of well-fed females of Pseudocalanus spp. for the above waters, and we suggest that they can be used to test the hypothesis more thoroughly.

2

Equivalence of rates of growth and egg production of Pseudocalanus

100%

Dzierzbicka-Głowacka L.

Oceanological and Hydrobiological Studies

|

2005

|

tom Vol. 34, No.4

19--32

EN

The equivalence of rates of growth and egg production is analyzed for well-fed females of Pseudocalanus from Puget Sound (Washington, USA) and from the southern North Sea. The hypothesis is tested using published data on the Pseudocalanus species. The growth rates of the copepodite stages for species from these two regions as a function of temperature and food concentration were used. Quantitative expressions describing the effects of temperature and the cephalothorax length of females on potential reproductive rate were compared. Food-saturated egg production was computed as the mean number of eggs per sac divided by 1.25 times the embryonic duration at the given temperature. The calculations were done based on experimental data from the literature for some geographically separate populations of Pseudocalanus from southwest Baffin Island, Nova Scotia, Long Island Sound, Scotland, and the southern North Sea and adjacent waters. These values were compared with the average number of eggs produced per day by one female obtained here as a function of growth rate, i.e., multiplying exp gmax – 1 from the growth rate equation by Wfemale/Wegg. The combined effect of food concentration and temperature as a function of these two parameters on egg production (reduced by food limitation) was also established for Pseudocalanus from Puget Sound. These assumptions and estimations appear to predict the temperature-length of female dependent daily rates of egg production of well-fed females of Pseudocalanus spp. for the above waters. Suggestions are made as to how to obtain and present data to test this hypothesis more thoroughly.

3

Technical efficiency of poultry egg production in Ogun State, Nigeria

88%

Osinowo O. H. , Tolorunju E. T.

Journal of Agribusiness and Rural Development

|

2019

|

nr 1[51]

4

Parameterisation of a population model for Acartia spp. in the southern Baltic Sea. Part 2. Egg production

88%

Dzierzbicka-Głowacka L. , Lemieszek A. , Żmijewska M. I.

Oceanologia

|

2009

|

tom No. 51 (2)

185-201

EN

The paper describes the modelling of egg production in Acartia spp. under changing environmental conditions in the southern Baltic Sea (Gdańsk Deep). The hypothesis (Sekiguchi et al. 1980) that the food-saturated rate of egg matter production is equivalent to specific growth rate of copepods is applied. The average number of eggs produced per day by one Acartia female is obtained as a function of growth rate, i.e. by multiplying exp gN3-1 from the growth rate of the nauplius stage equation by Wfemale / Wegg. The copepod model, reduced to a zero-dimensional population model calibrated for Acartia spp. under the environmental conditions typical of the southern Baltic Sea, was used to determine the effects of temperature and food concentration on the growth rate of each of the model stages (see Part 1 - Dzierzbicka-Głowacka et al. 2009 - this issue). In this part, egg production as a function of the above parameters is evaluated. The rate of reproduction during the seasons in the upper layer of the Gdańsk Deep is also determined.

5

Three novel single nucleotide polymorphisms of the 3-hydroxy-3-methylglutaryl coenzyme A reductase gene associated with egg-production in chicken

75%

Han C. , An G. , Du X.

|

2014

|

tom 62

|

nr 3

6

Estimation of genetic parameters for monthly egg production in laying hens based on random regression models

75%

Wolc A. , Szwaczkowski T.

Journal of Applied Genetics

|

2009

|

tom 50

|

nr 1

41-46

EN

Heritability and genetic correlations of monthly egg production under random regression models were estimated. Three layer lines (A22, A88, K66) in six consecutive generations were analysed. A22 (13,770 recorded hens) and A88 (13,950 recorded hens) are maternal lines of Rhode Island White birds selected on egg production and shell colour; K66 (9,351 recorded birds) is a paternal line of Rhode Island Red birds selected on egg weight. Eight models with different orders of Legendre polynomials were applied. Adequacy of the models was checked by the Akaike Information Criterion. According to the most adequate model including second order Legendre polynomials for fixed effects and third order for additive genetic and permanent environmental effects, relatively high heritabilities were estimated in the first (h²=0.3) and final (h² above 0.3) periods of production with a substantial decrease in heritability during the egg production peak. Methodology based on random regression animal models can be recommended for genetic evaluation of laying hens.

7

Feeding wheat distillers dried grains with solubles (DDGS) to laying hens and its effect on performance and egg quality

75%

Niemiec J. , Riedel J. , Szulc T. , Stepinska M.

Annals of Animal Science

|

2012

|

tom 12

|

nr 1

8

Parameterisation of a population model for Acartia spp. in the Southern Baltic Sea. Part 2. Egg production

75%

Dzierzbicka-Glowacka L. , Lemieszek A. , Zmijewska M. I.

Oceanologia

|

2009

|

tom 51

|

nr 2

185-201

EN

The paper describes the modelling ofeg g production in Acartia spp. under changing environmental conditions in the southern Baltic Sea (Gdańsk Deep). The hypothesis (Sekiguchi et al. 1980) that the food-saturated rate of egg matter production is equivalent to specific growth rate ofco pepods is applied. The average number ofeggs produced per day by one Acartia female is obtained as a function ofg rowth rate, i.e. by multiplying exp gN3 − 1 from the growth rate of the nauplius stage equation by Wfemale/Wegg. The copepod model, reduced to a zerodimensional population model calibrated for Acartia spp. under the environmental conditions typical ofthe southern Baltic Sea, was used to determine the effects of temperature and food concentration on the growth rate ofeac h oft he model stages (see Part 1 – Dzierzbicka-Głowacka et al. 2009 – this issue). In this part, egg production as a function of the above parameters is evaluated. The rate of reproduction during the seasons in the upper layer ofthe Gdańsk Deep is also determined.

9

Characterization of table eggs-producing organic farms in Mazowieckie Voivodeship

75%

Bombik E. , Korzeniewska A. , Maliszewski G.

|

tom 19

|

nr 2

10

Potential rate of reproduction for some geographically separate populations of Pseudocalanus spp.

75%

Dzierzbicka-Glowacka L. , Zielinski A.

Oceanologia

|

2004

|

tom 46

|

nr 1

EN

Quantitative expressions are presented describing the potential reproductive rate per individual female of Pseudocalanus spp. in several different waters (not reduced by food limitation) as a function of both temperature and cephalothorax length of females (one equation for each studied region). The calculations were made for some geographically separate populations of Pseudocalanus spp. from southwest Baffin Island, Nova Scotia, Long Island Sound, Scotland, as well as the southern North Sea and its adjacent waters (e.g. the English Channel). On the basis of the findings presented in this work and from other studies, the reproductive rate was computed as the mean number of eggs per sac divided by 1.25 times the embryonic duration at the given temperature. Also computed was the amount of egg matter produced per day as a percentage of body carbon (and dry weight) of female weight for all localities. The relationships for females from the southern North Sea were obtained for ‘viable eggs’, but they should be treated with reserve. A more suitable expression describing egg production in the southern North Sea is the equation for females from the English Channel obtained here. Our assumptions and approximations appear to predict quite well the temperature-length of female dependent daily rates of egg production of well-fed females of Pseudocalanus spp. for the above waters, and we suggest that they can be used to test the hypothesis more thoroughly.

11

Japanese quail and egg production

63%

Przywarova A. , Kadlec J. , Klecker D.

Zeszyty Naukowe. Przegląd Hodowlany

|

2001

|

tom 57

12

Effects of feeding a fermented product on egg production, faecal microflora and faecal pH in laying hens

63%

Loh T. C. , Law F. L. , Foo H. L. , Goh Y. M. , Zulkifli I.

|

2007

|

tom 16

|

nr 3

452-462

13

Modeling of egg production by Temora longicornis from the Southern Baltic Sea including salinity

63%

Dzierzbicka-Glowacka L. , Liemieszek A. , Musialik M. , Zmijewska I. M.

Oceanological and Hydrobiological Studies

|

2013

|

tom 42

|

nr 3

14

Prospects of table eggs production in Belarus

63%

Sytchevnik A. , Golovkov V.

|

2010

|

tom 10(25)

|

nr 3

EN

Problems of development of egg production in Belarus are considered. Dynamics of volume of egg production is considered for the period of 1995-2009. Results of production and sale of eggs by integrated (mass production) poultry farms are analyzed by means of a correlation method.

15

Prospects of table eggs production in Belarus

63%

Sytchevnik A. , Golovkov V.

Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego

|

2010

|

tom 10(25)

|

nr 3

EN

Problems of development of egg production in Belarus are considered. Dynamics of volume of egg production is considered for the period of 1995-2009. Results of production and sale of eggs by integrated (mass production) poultry farms are analyzed by means of a correlation method.

16

Ekologiczne jaja - szansa dla gospodarstw w naszym regionie

63%

Kwiatanowska J.

Biuletyn Informacyjno-Handlowy. Ośrodek Doradztwa Rolniczego Boguchwała

|

2000

|

nr 06

17

Ontogenetic features of protein metabolism in laying hens during the rearing and egg production period

63%

Kyryliv B.

|

nr 3

18

Emu (Dromaius novaehollandiae) laying performance and egg quality during a ten-year reproductive performance period

63%

Szczerbinska D. , Majewska D. , Tarasewicz Z. , Ramaniszyn K. , Sammel A. , Buclaw M.

Electronic Journal of Polish Agricultural Universities. Series Animal Husbandry

|

2014

|

tom 17

|

nr 2

19

Influence of day light length and maintenance conditions on the productivity of geese

63%

Bogenfurst F. , Karakas P. , Palmai L. , Taraszenko Z.

Zeszyty Naukowe. Przegląd Hodowlany

|

1997

|

tom 31

20

Zmiany w produkcji jaj spożywczych w Polsce po przystąpieniu do UE

63%

Sobczak J.

Problemy Inżynierii Rolniczej

|

2007

|

tom R. 15, nr 4

117-122

PL

Standardy unijne wprowadzając zmiany w systemach utrzymania kur nieśnych spowodowały konieczność wymiany wyposażenia technologicznego w blisko 80% kurnikach towarowych w Polsce. Ograniczenie obsady m2 powierzchni użytkowej o min. 30% w konsekwencji obniży liczbę jaj konsumpcyjnych pozyskiwanych przez producentów. Niepewność spowodowana nowymi przepisami może doprowadzić do wzrostu importu tanich jaj z innych państw, co przyczyniłoby się do obniżenia cen jaj wyprodukowanych w Polsce. Szansą polskiego drobiarstwa może być produkcja tzw. jaj "organicznych" lub "eko-jaj" pozyskiwanych w warunkach chowu z udziałem wybiegów lub specjalnych dodatków paszowych. Jaja takie uzyskują wysoką cenę na rynkach unijnych i są przyszłością na stołach bogatych konsumentów także w Polsce.

EN

European standards introduced definite changes in the keeping systems of laying hens, making necessary to replace the technological equipment in almost 80% laying hen houses in Poland. Limitation of the fowl density per m2 of useful surface by about 1/3 will consequently reduce the number of consumer eggs obtained by the producers. The uncertainty connected with new regulations may result in an increasing import of inexpensive eggs from the other countries. This would affect the price decline for eggs produced in Poland. The chance for Polish poultry farming may consists in production of so called "organic" eggs or "eco-eggs" obtained in layer keeping systems on the fowl yards or with special feed additives. Such eggs get a high price on the EU markets and are of the future on tables of wealthy consumers, also in Poland.