scholarly journals The Relationship Between Certain Thyroid Characteristics of Pullets and Their Egg Production, Body Weight and Environment

1959 ◽  
Vol 38 (3) ◽  
pp. 620-624 ◽  
Author(s):  
W.J. Mueller ◽  
A. Aguilera Amezcua
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Production Body ◽  
The Relationship

scholarly journals Canonical correlation analysis for studying the relationship between egg production traits and body weight, egg weight and age at sexual maturity in layers

2011 ◽  
Vol 50 (No. 4) ◽  
pp. 163-168 ◽  
Author(s):  
Y. Akbaş ◽  
Ç. Takma
Keyword(s):  
Body Weight ◽  
Correlation Analysis ◽  
Canonical Correlation Analysis ◽  
Canonical Correlation ◽  
Sexual Maturity ◽  
Egg Production ◽  
Production Traits ◽  
Egg Weight ◽  
Canonical Correlations ◽  
The Relationship

In this study, canonical correlation analysis was applied to layer data to estimate the relationships of egg production with age at sexual maturity, body weight and egg weight. For this purpose, it was designed to evaluate the relationship between two sets of variables of laying hens: egg numbers at three different periods as the first set of variables (Y) and age at sexual maturity, body weight, egg weight as the second set of variables (X) by using canonical correlation analysis. Estimated canonical correlations between the first and the second pair of canonical variates were significant (P < 0.01). Canonical weights and loadings from canonical correlation analysis indicated that age at sexual maturity had the largest contribution as compared with body weight and egg weight to variation of the number of egg productions at three different periods.  

ESTERASE GENOTYPES AND PERFORMANCE TRAITS IN MEAT-TYPE CHICKENS

1977 ◽  
Vol 19 (4) ◽  
pp. 645-650 ◽  
Author(s):  
A. A. Grunder ◽  
E. S. Merritt
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Major Influence ◽  
Allelic Frequencies ◽  
Reproduction Traits ◽  
Egg Production Rate ◽  
And Performance ◽  
And Control ◽  
The Relationship ◽  
Meat Type

The genotypes at a serum esterase locus were determined for 3208 female meat-type chickens. These birds belonged to three generations of six strains on which records of body-weight and reproduction traits were kept. Allelic frequencies among strains were compared and then a study was made of the relationship between esterase genotype and the following traits: body weight at five ages, age at first egg, survivor egg production, rate of egg production (%), egg weight, fertility and hatchability. Allelic frequencies did not differ in two of three years between replicate control strains but were significantly different in seven of nine comparisons between selected and control strains. Analysis of variance of paired comparisons of genotypes on a within dam family basis revealed only five of the 106 comparisons to be significant. No heterotic effects were indicated. It was concluded that the esterase genotypes studied do not have a major influence on the traits investigated.

The Fecundity of Ixodes Ricinus (L.) (Acarina: Ixodidae) and the Mortality of its Developmental Stages Under Field Conditions

1981 ◽  
Vol 71 (3) ◽  
pp. 533-542 ◽  
Author(s):  
J. S. Gray
Keyword(s):  
Body Weight ◽  
Ixodes Ricinus ◽  
Blood Meal ◽  
Egg Production ◽  
Developmental Stages ◽  
Small Rodents ◽  
Winter Temperatures ◽  
Almost All ◽  
The Relationship ◽  
Very High

AbstractThe egg production of females of Ixodes ricinus (L.) was found to be closely related to the engorged body weight. The relationship was due almost entirely to the size of the blood-meal. Smaller ticks seemed to be slightly more efficient than larger ones in converting their blood-meal to eggs. Ticks, especially larvae, that overwintered in diapause did not survive as well as those that fed and then moulted in the same year. Larvae that fed and entered diapause early in the autumn did not survive as well as those that fed later in the season. A very high proportion of tick eggs hatched, either in the same year as they were laid or after overwintering. Almost all nymphs and adults became active and climbed to the top of the tubes after moulting. Although most larvae appeared to become active, only about half of them reached the tops of the tubes. This is thought to be a reflection on the fact that larvae are adapted to parasitise small rodents. It is suggested that winter temperatures may play an important part in determining the mortality rate of larvae that overwinter in the engorged state.

FEEDING AND EGG PRODUCTION OF TWO SPECIES OF COCCINELLIDS IN THE LABORATORY

1981 ◽  
Vol 113 (11) ◽  
pp. 999-1005 ◽  
Author(s):  
P. M. Ives
Keyword(s):  
Body Weight ◽  
Food Consumption ◽  
Egg Production ◽  
Feeding Rate ◽  
Influence Of Temperature ◽  
Maintenance Requirement ◽  
Pea Aphids ◽  
Influence Of Temperature On ◽  
Increasing Temperature ◽  
The Relationship

AbstractThe relationship between feeding rate and egg production of Coccinella trifasciata Mulsant and C. californica Mannerheim feeding on pea aphids, was investigated in the laboratory at 15.0°, 18.5°, 21.5°, and 25.5°C. Both species increase their feeding rate with increasing temperature above 13.6°C, with C. californica, the larger species, increasing its food consumption faster. C. californica also has the higher maintenance requirement but when food consumption is expressed relative to the beetles’ body weight, there is no difference between the species in either attribute. Coccinella californica converts excess food to eggs more efficiently than C. trifasciata.No significant influence of temperature on either the conversion rate or the maintenance requirement could be detected. The adverse effects of a very low feeding rate, whether due to restricted food supply or low temperature, influenced the beetles’ response to subsequent treatments.

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