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Productivity of laying hens in different production systems

100%

Sokolowicz Z., Krawczyk J., Dykiel M.

Acta Scientiarum Polonorum. Zootechnica

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2018

|

tom 17

|

nr 2

2

Distribution of radioruthenium in laying hen tissues after repeated administration

100%

Rachubik J., Kowalski B.

Bulletin of the Veterinary Institute in Puławy

|

2002

|

tom 46

|

nr 2

3

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

86%

Wolc A., Szwaczkowski T.

Journal of Applied Genetics

|

2009

|

tom 50

|

nr 1

41-46

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.

4

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

86%

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

Annals of Animal Science

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2012

|

tom 12

|

nr 1

5

Comparison of the laying and egg weight of laying hens in two types of cages

86%

Damaziak K., Riedel J., Michalczuk M., Kurek A.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2013

|

tom 52

This study was aimed at comparing production results of laying hens kept in two types of cages: furnished cages and conventional cages. It covered the period from the 36th till the 54th week of hens life that was divided into two experimental stages: stage I - from week 36 till week 44, and stage II - from week 46 to week 54. Till week 44, 190 layers were reared in groups (10 hens each) in furnished cages (F) and 190 layers were kept individually in conventional cages (C). In week 45, the hens from furnished cages (F) were moved to conventional cages (FC), whereas these from conventional cages (C) were randomly merged into groups of 10 hens and transferred to furnished cages (CF). Egg laying (%) and egg weight (g) were controlled as well as percentage contribution of eggs in standard egg weight classes was determined in both experimental stages. The study showed a significant (P < 0.01) effect of cage type on the laying performance of the hens but only in the second stage of the study, as well as a significant (P < 0.01) effect of hens moving to different cages. In both cases, higher egg laying was reported for the hens from the conventional cages. Egg weight in the first and the second stage of the experiment was significantly (P < 0.01) higher in the groups housed in the furnished cage. A higher egg weight (P < 0.01) was determined in the layers in the second stage of the study. Both in the first (P < 0.01) and in the second (P < 0.05) stage, analyses showed a significant effect of cage type on the contribution (%) of eggs in particular egg weight classes. A higher percentage of eggs in the L class was obtained from the hens housed in the furnished cages. Differences in laying performance after hens moving suggest that the layers adapt more easily and faster to conditions of the C type cages. The egg weight was, probably, more dependent on general laying performance and age of the hens than on cage type.

6

Efficacy of 25-hydroxycholecalciferol in laying hens

86%

Rutkowski A., Kaczmarek S., Wiaz M., Stanislawski P., Jozefiak D.

Polish Journal of Natural Sciences. Supplement

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2006

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tom 03

511-516

7

Dynamics of quality indexes of laying hens keeping process due to fluctuations of temperature disturbances in an industrial poultry house

86%

Lysenko V., Golovinskiy B., Reshetyuk V., Golub B., Shcherbatyuk V.

Annals of Warsaw University of Life Sciences - SGGW. Agriculture

|

2011

|

nr 57 Agric.Forest Eng.

8

A note on the effect of immunostimulation of laying hens on the lysozyme activity in egg white

86%

Swierczewska E., Niemiec J., Noworyta-Glowacka J.

Animal Science Papers and Reports

|

2003

|

tom 21

|

nr 1

Four immunostimulating preparations (IPs) – Levamisol, Lidium KLP, Echinacea and Baymix Se+E – were administered to Hy-Line hens aged 8 months (group I, II, III and IV, respectively, 10 birds in each). The egg white lysozyme activity (LA) was determined before administering the IP, and next 17, 24, 31, 45 and 60 days after. All IPs led to an increase in the egg white LA which was maintained over a period of 45 (group II, III and IV) and even 60 days (group I) after administration. Levamisol was shown to be most effective IP, while Baymix Se+E the least.

9

Effect of the addition of different quantities of vitamin C to diets of laying hens on production parameters and quality of egg shell

86%

Kontecka H., Witkiewicz K., Nowaczewski S.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

1999

|

tom 01

10

Effect of dried mycelium on progesterone and estradiol levels in hen ovary

86%

Rzasa J., Koreleski J., Proszkowiec M., Swiatkiewicz S., Tabaszewska A., Kluska E.

Annals of Animal Science

|

2002

|

tom 02

|

nr 1

11

Effect of diet on amino acid profile of egg yolk

86%

Horniakova E., Michalkova J.

Polish Journal of Food and Nutrition Sciences

|

2007

|

tom 57

|

nr 4[B]

12

Curvilinear inbreeding effects on some performance traits in laying hens

86%

Szwaczkowski T., Cywa-Benko K., Wezyk S.

Journal of Applied Genetics

|

2004

|

tom 45

|

nr 3

13

Effect of stocking density on layer welfare

86%

Sokolowicz Z., Poltowicz K.

Annals of Animal Science. Supplement

|

2002

|

nr 1

14

Relationship between semen parameters, fertility and hatchability of eggs in five original laying strains of hens

86%

Machal L., Jankowski J.

Polish Journal of Natural Sciences

|

2002

|

tom 10

15

Quality of table eggs as influenced by laying hen origin

72%

Czaja L., Dziadek K., Gornowicz E.

Annals of Animal Science

|

2005

|

tom 05

|

nr 1

16

The distribution of vitamins A, E and C in tissues of laying hens during reproductive period

72%

Kuklenko T., Ionov I., Surai P.

Zeszyty Naukowe. Przegląd Hodowlany

|

1997

|

tom 31

17

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

72%

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

Journal of Animal and Feed Sciences

|

2007

|

tom 16

|

nr 3

452-462

18

The effect of tetraploid Robinia pseudoacacia leaf meal on performance, egg quality, and nutrient digestibility in laying hens

72%

Zhang G. J., Li Y., Sun Y. H., Yuan C. Q., Xu Z. H.

Journal of Animal and Feed Sciences

|

2013

|

tom 22

|

nr 4

A 60-day feeding experiment was conducted to study the effects of including 0, 20, 40, or 60 g · kg–1 leaf meal of tetraploid Robinia pseudoacacia (TRLM) in diets on performance, egg quality, and apparent nutrient and amino acid digestibility of hens. Egg mass and egg weight were both higher when feeding 40 g · kg–1 TRLM than the other three diets, the egg shape index linearly increased (P < 0.05). No significant effects of diet were seen on the other hen performance or egg quality parameters. Apparent nutrient and amino acid digestibilities increased at first and subsequently decreased with increasing inclusion of the foliage, but no significant differences were observed in dry matter or glycine. Digestibility of crude protein, ether extract, gross energy and acid detergent fibre increased up to 20 g · kg–1 TRLM and subsequently decreased, and similar trends were observed for 13 amino acids, but the digestibility of neutral detergent fibre decreased up to 40 g · kg–1 TRLM and subsequently increased. A significant linear decrease (P < 0.05) in the digestibility of proline was observed with increasing inclusion of TRLM into the diets. Tetraploid Robinia pseudoacacia leaf meal could be a potential supplementary protein source in laying hen diets at inclusion levels not exceeding 60 g · kg–1.

19

Influence of rape seeds in laying hen rations on the fatty acid profile of the egg yolk fat

72%

Brettschneider J. G., Jankowski J., Kozlowski K., Jeroch H.

Polish Journal of Natural Sciences. Supplement

|

2006

|

tom 03

397-402

20

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

72%

Kyryliv B.

Acta Scientiarum Polonorum. Zootechnica

|

2018

|

tom 17

|

nr 3

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