scholarly journals Analysis of Factors Affecting Year-Round Performance of Single Comb White Leghorn Laying Hens Reared Under an Open-Sided Housing System

1988 ◽  
Vol 67 (8) ◽  
pp. 1130-1138 ◽  
Author(s):  
J. OKUMURA ◽  
N. MORI ◽  
T. MURAMATSU ◽  
I. TASAKI ◽  
F. SAITO
Keyword(s):  
Laying Hens ◽  
Housing System ◽  
White Leghorn ◽  
Factors Affecting ◽  
Single Comb

INFLUENCE OF FABABEAN FRACTIONS ON EGG WEIGHT AMONG LAYING HENS FED TEST DIETS FOR A SHORT TIME PERIOD

1981 ◽  
Vol 61 (3) ◽  
pp. 751-755 ◽  
Author(s):  
G. OLABORO ◽  
L. D. CAMPBELL ◽  
R. R. MARQUARDT
Keyword(s):  
Extraction Method ◽  
Laying Hens ◽  
Short Time Period ◽  
White Leghorn ◽  
Short Term ◽  
Egg Weight ◽  
Time Period ◽  
Bioassay Test ◽  
Short Time ◽  
Single Comb

A short-term bioassay test using Single Comb White Leghorn (SCWL) laying hens was developed to study various fractions of fababeans, to determine the location of the egg-weight-depressing factor (EWDF), and to determine the effect of heat treatment on EWDF activity. A second objective of the research was to develop an extraction method to facilitate studies on identification and mode of action of the factor(s). The 14-day period proved useful in confirming that EWDF activity was concentrated in the cotyledon portion of fababean seeds and associated with the protein rather than the starch component. Ethanol-water extraction was effective in concentrating the factor.

SUBSTITUTION OF SORGHUM FOR WHEAT IN DIETS FOR LAYING HENS

1982 ◽  
Vol 62 (1) ◽  
pp. 305-306 ◽  
Author(s):  
E. E. GARDINER ◽  
D. J. MAJOR ◽  
S. DUBETZ
Keyword(s):  
Body Weight ◽  
Key Words ◽  
Egg Production ◽  
Laying Hens ◽  
Feed Consumption ◽  
White Leghorn ◽  
Egg Weight ◽  
Single Comb

The effects of substituting various levels of sorghum for wheat in diets for laying hens were studied. Egg production, egg weight, feed consumption, body weight and hatchability of eggs from Single Comb White Leghorn hens were not affected by the proportion of sorghum in the diet. Key words: Sorghum, wheat, nutrition, egg production

scholarly journals Cuticle deposition duration in the uterus is correlated with eggshell cuticle quality in White Leghorn laying hens

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xia Chen ◽  
Zhaoxiang He ◽  
Xingzheng Li ◽  
Jianlou Song ◽  
Mingyi Huang ◽  
...  
Keyword(s):  
Laying Hens ◽  
Egg Quality ◽  
Genetic Regulation ◽  
Reproductive Hormones ◽  
Poultry Production ◽  
White Leghorn ◽  
Factors Affecting ◽  
Qpcr Analysis ◽  
Deposition Duration ◽  
Major Factors

AbstractThe cuticle formed in the uterus is the outermost layer as the first defense line of eggshell against microbial invasions in most avian species, and analyzing its genetic regulation and influencing factors are of great importance to egg biosecurity in poultry production worldwide. The current study compared the uterine transcriptome and proteome of laying hens producing eggs with good and poor cuticle quality (GC and PC, the top and tail of the cuticle quality distribution), and identified several genes involved with eggshell cuticle quality (ESCQ). Overall, transcriptomic analysis identified 53 differentially expressed genes (DEGs) between PC versus GC group hens, among which 25 were up-regulated and 28 were down-regulated. No differences were found in the uterine proteome. Several DEGs, including PTGDS, PLCG2, ADM and PRLR related to uterine functions and reproductive hormones, were validated by qPCR analysis. Egg quality measurements between GC and PC hens showed GC hens had longer laying interval between two consecutive ovipositions (25.64 ± 1.23 vs 24.94 ± 1.12 h) and thicker eggshell thickness (352.01 ± 23.04 vs 316.20 ± 30.58 μm) (P < 0.05). Apart from eggshell traits, other egg quality traits didn’t differ. The result demonstrated eggshell and cuticle deposition duration in the uterus is one of the major factors affecting ESCQ in laying hens. PTGDS, PLCG2, ADM and PRLR genes were discovered and might play crucial roles in cuticle deposition by regulating the uterine muscular activities and secretion function. The findings in the present study provide new insights into the genetic regulation of cuticle deposition in laying hens and establish a foundation for further investigations.

scholarly journals Effect of Dietary Acidification and Alkalinization on Urolith Formation and Renal Function in Single Comb White Leghorn Laying Hens

1988 ◽  
Vol 67 (12) ◽  
pp. 1694-1701 ◽  
Author(s):  
RAYMOND P. GLAHN ◽  
ROBERT F. WIDEMAN ◽  
BARRETT S. COWEN
Keyword(s):  
Renal Function ◽  
Laying Hens ◽  
White Leghorn ◽  
Single Comb

scholarly journals Research Note: Relationship of Comb Color to Liver Appearance and Fat Content in Single Comb White Leghorn Laying Hens

1991 ◽  
Vol 70 (12) ◽  
pp. 2544-2546 ◽  
Author(s):  
J.L. GRIMES ◽  
D.V. MAURICE ◽  
S.F. LIGHTSEY ◽  
W.C. BRIDGES
Keyword(s):  
Laying Hens ◽  
Fat Content ◽  
Research Note ◽  
White Leghorn ◽  
Relationship Of ◽  
Single Comb

EVALUATION OF FULL-FAT SPAN RAPESEED AS AN ENERGY AND PROTEIN SOURCE FOR LAYING HENS

1975 ◽  
Vol 55 (2) ◽  
pp. 219-222 ◽  
Author(s):  
J. M. OLOMU ◽  
A. R. ROBBLEE ◽  
D. R. CLANDININ ◽  
R. T. HARDIN
Keyword(s):  
Egg Production ◽  
Dry Matter ◽  
Laying Hens ◽  
Egg Quality ◽  
White Leghorn ◽  
Feed Conversion ◽  
Low Erucic Acid ◽  
Dietary Treatments ◽  
Single Comb ◽  
Simple Regression

Full-fat Span rapeseed (a low erucic acid variety), which had been steam-treated at 90 C for 30 min and then ground, was examined as a protein and energy source in rations of Single Comb White Leghorn laying hens during a laying period of 336 days. The levels of mortality and egg production were not significantly affected by the inclusion of 0, 5, 10 or 15% Span rapeseed in the ration; however, calculation of the simple regression between hen-day production and level of rapeseed used indicated a significant decrease in production with increasing levels of rapeseed in the ration. No mortality was attributed to ’haemorrhagic liver syndrome’ in the groups fed rations containing 0 and 5% rapeseed but the incidence of haemorrhagic liver syndrome was 3.1 and 4.2%, respectively, in birds fed rations containing 10 and 15% rapeseed. Egg quality, feed conversion and body weight were not affected by any of the dietary treatments. The sizes of the livers and hearts and their composition of dry matter, fat and protein were not significantly affected by dietary treatments. There was, however, a progressive and significant (P < 0.05) increase in the relative weights of the thyroids as the level of rapeseed in the ration was increased.

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