scholarly journals Some Factors Affecting Egg Size in the Domestic Fowl

1933 ◽  
Vol 12 (6) ◽  
pp. 362-367 ◽  
Author(s):  
Noel L. Bennion ◽  
D.C. Warren
Keyword(s):  
Domestic Fowl ◽  
Egg Size ◽  
Factors Affecting

Some observations on factors affecting myoglobin concentrations in muscle

1950 ◽  
Vol 40 (4) ◽  
pp. 356-366 ◽  
Author(s):  
R. A. Lawrie
Keyword(s):  
Domestic Fowl ◽  
Adult Animal ◽  
Significant Rise ◽  
Longissimus Dorsi ◽  
Probability Level ◽  
Factors Affecting ◽  
Relationship Of

1. The myoglobin contents of selected muscles in horse, pig, domestic fowl and pigeon, and in the foetuses of horse, pig, sheep and cattle, have been determined.2. The order of increasing concentration of myoglobin in the adult animal (4 years) is given by the series heart, longissimus dorsi, diaphragm and psoas, the figures for draught horse being, respectively, 0·325, 0·465, 0·610 and 0·705% and for pig, 0·203, 0·280, 0·350 and 0·435%, and the ratios of these concentrations being the same in each animal.3. In both draught horse and pig, it is shown that the concentration of the pigment rises rapidly from birth, and that, after 2 years in the horse, and 1 year in the pig, it remains fairly constant, except in the case of horse psoas and diaphragm where there is a slow, but significant, rise throughout life.4. This relationship of myoglobin with age has been shown to be significant at a probability level of 0·1%.

Factors affecting egg viability and incubation time in prairie dabbling ducks

1993 ◽  
Vol 71 (6) ◽  
pp. 1146-1152 ◽  
Author(s):  
Todd W. Arnold
Keyword(s):  
Clutch Size ◽  
Incubation Time ◽  
Egg Size ◽  
Hatching Success ◽  
Size Variation ◽  
Negative Effects ◽  
Factors Affecting ◽  
Ambient Temperatures ◽  
Weak Support ◽  
Anas Clypeata

I determined hatching success for 328 dabbling duck (Anas spp.) eggs that were experimentally subjected to varying lengths of preincubation delay and then artificially incubated. Hatchability declined as unincubated eggs were exposed to longer preincubation delays. This effect was more pronounced at higher ambient temperatures and later in the nesting season, but did not vary with egg size or among duck species. These results are largely consistent with observed patterns of clutch-size variation among prairie-nesting waterfowl. Clutch size may be smaller later in the year and at lower latitudes owing to the negative effects of date and temperature on the ability of eggs to withstand preincubation delay. The timing of embryo mortality was bimodal, with peaks occurring during early development (<6 d) and just before hatching (>22 d); however, only early mortality was affected by preincubation delay. Eggs lost up to 2.6% of their initial mass as water vapor during preincubation delay, but the amount of water loss did not affect hatching success. Eggs subjected to preincubation delay required about 1 additional day to hatch. Incubation time was related to egg size in northern shovelers (Anas clypeata) and in all species combined, but not in blue-winged teal (Anas discors) or mallards (Anasplatyrhynchos). These data provide only weak support for the hypothesis that large eggs are costly because they take longer to hatch.

Immunoglobulin-Y (IgY) levels in domestic fowl exposed to red mite (Dermanyssus gallinae)

2005 ◽  
Vol 2005 ◽  
pp. 172-172
Author(s):  
S. Arkle ◽  
J. H. Guy ◽  
O. Sparagano
Keyword(s):  
Blood Meal ◽  
Domestic Fowl ◽  
Egg Production ◽  
Egg Size ◽  
Laying Hens ◽  
Dermanyssus Gallinae ◽  
Serological Response ◽  
Immunoglobulin Production ◽  
Natural Exposure ◽  
Egg Yolks

Red mite (Dermanyssus gallinae; De Geer, 1778) is currently the most economically deleterious ectoparasite of layer hens in several countries (Chauve, 1998). D. gallinae is an obligatory haematophagous ectoparasite of both domestic and wild birds (Bruneau et al., 2001), only found on the host during darkness when obtaining a blood meal. The remaining part of its lifecycle is spent concealed deep in the house substructure, in cracks and crevices, with control typically implemented via chemical spraying. Mite exposure in laying hens generally results in irritation, restlessness, anaemia, and occasionally death and may subsequently lead to decreased egg production, poor shell integrity, blood staining and egg size reductions (Chauve, 1998; Cosoroaba, 2001). Natural exposure to mite-antigens during feeding activates humoral immunity of the fowl, in the form of immunoglobulin production. However, the magnitude of this serological response over a prolonged infestation period and at different mite population levels is unclear. Therefore the aim of this study was to determine the levels of anti-mite immunoglobulin present in egg yolks of laying hens in flocks infested with differing population levels of red mite over a period of 16 weeks.

Effect of body size, age and timing of breeding on clutch and egg size of female Eastern Gray Treefrogs, Hyla versicolor

2021 ◽  
pp. 1-11
Author(s):  
Gerlinde Höbel ◽  
Robb Kolodziej ◽  
Dustin Nelson ◽  
Christopher White
Keyword(s):  
Life History ◽  
Egg Size ◽  
Life History Theory ◽  
Reproductive Investment ◽  
Ecological Factors ◽  
Hyla Versicolor ◽  
Growth And Survival ◽  
Factors Affecting ◽  
Trade Offs ◽  
Gray Treefrogs

Abstract Information on how organisms allocate resources to reproduction is critical for understanding population dynamics. We collected clutch size (fecundity) and egg size data of female Eastern Gray Treefrogs, Hyla versicolor, and examined whether observed patterns of resource allocation are best explained by expectations arising from life history theory or by expected survival and growth benefits of breeding earlier. Female Hyla versicolor showed high between-individual variation in clutch and egg size. We did not observe maternal allocation trade-offs (size vs number; growth vs reproduction) predicted from life history theory, which we attribute to the large between-female variation in resource availability, and the low survival and post-maturity growth rate observed in the study population. Rather, clutches are larger at the beginning of the breeding season, and this variation in reproductive investment aligns with seasonal variation in ecological factors affecting offspring growth and survival.

scholarly journals Some Factors Affecting Egg Weight in the Domestic Fowl

1933 ◽  
Vol 12 (2) ◽  
pp. 97-111 ◽  
Author(s):  
Raymond T. Parkhurst
Keyword(s):  
Domestic Fowl ◽  
Egg Weight ◽  
Factors Affecting

scholarly journals A study on the influence of poultry feed on the size, weight and protein content of egg

2020 ◽  
Vol 1 (2) ◽  
pp. 121-125
Author(s):  
Revathy S.
Keyword(s):  
Protein Content ◽  
Domestic Fowl ◽  
Egg Production ◽  
Egg Size ◽  
Production Performance ◽  
Poultry Feed ◽  
Distillers Grains With Solubles ◽  
Cooked Rice ◽  
Standard Procedures ◽  
Different Types

Abstract: The egg of domestic fowl has been an important constituent of the cuisine of people around the world. The present study was carried out with the objective to analyse the influence of selected poultry feed on the size, weight and protein content of egg by feeding the hens with four different types of feed. Hens of the laying Gramasree variety were used in this experiments. Egg size, weight and the protein content was recorded as per standard procedures. Egg production significantly reduced in hen fed with cooked rice alone. When considering egg size and weight, domestic fowl fed with wheat, soya and groundnut had greater size. However, there has not been much variation in the protein content of all the eggs produced by the four hens in the present study. The study provides a baseline indication that the quality, size and weight of the egg are greatly influenced by their feed. Keywords: Dried Rice Distillers Grains with Solubles (RDGS), Vanaraja Birds, Production performance

scholarly journals Temperature and Its Effect on Egg Size in the Domestic Fowl

1933 ◽  
Vol 12 (2) ◽  
pp. 69-82 ◽  
Author(s):  
Noel L. Bennion ◽  
D.C. Warren
Keyword(s):  
Domestic Fowl ◽  
Egg Size
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