scholarly journals Computer-Simulated Growth Prediction of Replacement Pullets with Special Reference to Seasonal Changes in Feed Intake

1989 ◽  
Vol 68 (6) ◽  
pp. 771-780 ◽  
Author(s):  
T. MURAMATSU ◽  
S. ISARIYODOM ◽  
I. UMEDA ◽  
J. OKUMURA
Keyword(s):  
Special Reference ◽  
Feed Intake ◽  
Seasonal Changes ◽  
Growth Prediction ◽  
Simulated Growth

Seasonal production of Andropogen Gayanus: II. Seasonal changes in digestibility and feed intake

1970 ◽  
Vol 75 (3) ◽  
pp. 369-373 ◽  
Author(s):  
R. J. Haggar ◽  
M. B. Ahmed
Keyword(s):  
Feed Intake ◽  
Seasonal Changes ◽  
Crude Protein ◽  
Dry Matter ◽  
Nutritive Value ◽  
Protein Digestibility ◽  
Dry Matter Digestibility ◽  
Voluntary Feed Intake ◽  
Andropogon Gayanus ◽  
Voluntary Intake

SUMMARYTwenty-seven sheep feeding trials were carried out on freshly cut Andropogon gayanus, fed daily during three wet seasons, 1966–8.In each year, dry-matter voluntary intake and digestibility were highest during the first part of the growing season and declined with advancing maturity of the herbage. However, at the time of ear emergence in early October, there were small increases in voluntary intake of dry-matter and crude protein digestibility, although further decreases followed after mid-October.Determinations of in vitro digestibility indicated that elongating stems during early October were at least as digestible as leaves.Seasonal changes in crude protein digestibility were much greater than changes in dry-matter digestibility; seasonal changes in feed intake were intermediate. Voluntary feed intake was related to dry-matter digestibility.Voluntary feed intake and digestible crude protein were both closely related to the crude protein content of the forage. It was concluded that crude protein is a useful criterion for predicting nutritive value.

Factors modifying egg production with special reference to seasonal changes

1933 ◽  
Vol 23 (3) ◽  
pp. 383-418 ◽  
Author(s):  
Elizabeth O. Whetham
Keyword(s):  
Special Reference ◽  
Seasonal Changes ◽  
Egg Production ◽  
Natural Variation ◽  
Anterior Lobe ◽  
Light Period ◽  
The World ◽  
The Hours ◽  
Effect Of Light

Summary1. Sexual periodicity in many animals is largely conditioned by variations in the daily light period. That egg production in hens may be controlled by the use of artificial lights has long been known.2. The action of light is probably connected with the activity of the anterior lobe of the pituitary.3. The natural variation in daily light period at different latitudes has been used to study the effect of light on egg production throughout the world. Curves have been constructed of egg production grouped in 5° of latitude and the correlation with the hours of daylight at those latitudes studied.

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