scholarly journals THE RATE OF SENESCENCE OF THE DOMESTIC FOWL AS MEASURED BY THE DECLINE IN EGG PRODUCTION WITH AGE

1923 ◽  
Vol 6 (1) ◽  
pp. 41-45 ◽  
Author(s):  
Samuel Brody ◽  
Earl W. Henderson ◽  
H. L. Kempster
Keyword(s):  
Chemical Reaction ◽  
Domestic Fowl ◽  
Egg Production ◽  
Physicochemical Process ◽  
Exponential Law ◽  
The Law ◽  
Constant Percentage

Data are presented showing that the course of decline of egg production with age in the domestic fowl from the time laying begins up to and including 8 years follows an exponential law, that is, each year's egg production is a constant percentage of the preceding year's production (88 per cent in the group of fowl studied). Since the exponential law is the same as the law of monomolecular change in chemistry, and since the course of egg production with age may be taken as an index of the course of senescence of organs, or tissues limiting egg production, it is suggested that this exponential law of egg production substantiates the idea that senescence is a physicochemical process the course of which is limited by a chemical reaction. It is shown that the exhaustion of the oocytes is not likely to be the factor limiting the course of egg production.

scholarly journals THE KINETICS OF SENESCENCE

1924 ◽  
Vol 6 (3) ◽  
pp. 245-257 ◽  
Author(s):  
Samuel Brody
Keyword(s):  
Chemical Reactions ◽  
Growing Period ◽  
Exponential Law ◽  
The Law ◽  
Kinetics Of ◽  
Constant Percentage

The course of decline of vitality with age due to the process of senescence, when not complicated by the process of growth, follows a simple exponential law; that is the degree of vitality or of senescence (defining vitality as the reciprocal of senescence) at any moment is, regardless of age, a constant percentage of the degree of vitality or senescence of the preceding moment. This exponential law is the same as the law of monomolecular change in chemistry. During the actively growing period of life the index of vitality rises, due to the process of growth and the course of vitality in the case when the growing period is included in the vitality curve, follows a rising and falling course. This rising and falling course may often be represented by an equation containing two exponential terms which is practically the equation used to represent the course of accumulation and disappearance of a substance as the result of two simultaneous consecutive monomolecular chemical reactions.

scholarly journals THE RATE OF GROWTH OF THE DAIRY COW

1924 ◽  
Vol 6 (3) ◽  
pp. 329-336
Author(s):  
Samuel Brody ◽  
Arthur C. Ragsdale
Keyword(s):  
Dairy Cow ◽  
Chemical Process ◽  
Exponential Law ◽  
Rate Of Growth ◽  
Linear Dimensions ◽  
Constant Rate ◽  
The Law ◽  
The Given ◽  
Cyclic Phenomena ◽  
Constant Percentage

Barring fluctuations due to the cyclic phenomena, the extrauterine course of growth in linear dimensions and in weight of the dairy cow follows an exponential law having the same form as the law representing the course of monomolecular change in chemistry. This suggests the interpretation that the general course of growth is limited by a monomolecular chemical process, and that the cyclic phenomena are due to subsidiary processes in the fundamentally exponential course of growth. The fact that growth follows or tends to follow an exponential course may be stated more simply as follows: if the unit of time is taken sufficiently large so that fluctuations due to the cyclic phenomena are balanced or eliminated, then the amount of growth made during the given unit of time at any age tends to be a constant percentage of the growth made during the preceding unit of time. Thus, the growth in height at withers made during any year is about 34 per cent of the growth made during the preceding year. Similarly the growth in weight made during any year is about 56 per cent of the growth in weight made during the preceding year. This is in accordance with expectations if it is assumed that each animal begins life with a definite endowment of limiting substance necessary for the process of growth, and that this endowment is used up at a constant rate (or percentage) of itself.

The Inheritance of Egg Production in the Domestic Fowl

1943 ◽  
Vol 77 (769) ◽  
pp. 119-132 ◽  
Author(s):  
I. Michael Lerner ◽  
Lewis W. Taylor
Keyword(s):  
Domestic Fowl ◽  
Egg Production

scholarly journals THE CORRELATION BETWEEN BODY PIGMENTATION AND EGG PRODUCTION IN THE DOMESTIC FOWL

Genetics ◽  
1917 ◽  
Vol 2 (2) ◽  
pp. 205-205
Author(s):  
J Arthur Harris ◽  
A F Blakeslee ◽  
D E Warner ◽  
Wm F Kirkpatrick
Keyword(s):  
Domestic Fowl ◽  
Egg Production ◽  
Body Pigmentation

scholarly journals Influence of Inbreeding on Egg Production in the Domestic Fowl

1953 ◽  
Vol 32 (3) ◽  
pp. 510-517 ◽  
Author(s):  
A.B. Stephenson ◽  
A.J. Wyatt ◽  
A.W. Nordskog
Keyword(s):  
Domestic Fowl ◽  
Egg Production
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