Effects of Air Velocity on Laying Hen Production from 24 to 27 Weeks under Simulated Evaporatively Cooled Conditions

The present research aims to analyse diffusion flame in a tube type burner with Liquefied petroleum gas (LPG) as a fuel. An experimental investigation is performed to study flame appearance, flame stability, Soot free length fraction (SFLF) and CO emission of LPG diffusion flame. Effects of varying air and fuel velocities are analysed to understand the physical process involved in combustion. SFLF is measured to estimate the reduction of soot. Stability limits of the diffusion flame are characterized by the blowoff velocity. Emission characteristic in terms of CO level is measured at different equivalence ratios. Experimental results show that the air and fuel velocity strongly influences the appearance of LPG diffusion flame. At a constant fuel velocity, blue zone increases and the luminous zone decreases with the increase in air velocity. It is observed that the SFLF increases with increasing air velocity at a constant fuel velocity. It is observed that the blowoff velocity of the diffusion flame increases as fuel velocity increases. Comparison of emission for flame with and without swirl indicates that swirl results in low emission of CO and higher flame stability. Swirler with 45° vanes achieved the lowest CO emission of 30 ppm at Φ = 1.3.

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THE UPTAKE OF (6,7-3H) 17β-OESTRADIOL BY TISSUES OF THE DOMESTIC FOWL

Acta Endocrinologica ◽

10.1530/acta.0.0600199 ◽

1969 ◽

Vol 60 (2) ◽

pp. 199-209 ◽

Cited By ~ 5

Author(s):

R. A. Hawkins ◽

P. J. Heald ◽

Patricia Taylor

Keyword(s):

Pituitary Gland ◽

Intravenous Injection ◽

Domestic Fowl ◽

Physiological State ◽

Laying Hen ◽

Adult Bird

ABSTRACT A limited investigation of the distribution of radioactivity in the tissues of the adult laying hen has been made at differing times after intravenous injection of (6,7-3H) 17β-oestradiol. Uptake by all tissues examined was maximal between 2.0 and 4.0 minutes after injection. There was a marked retention of radioactivity by the oviduct and the liver. Of cerebral tissues examined the uptake of radioactivity was greatest in the pituitary gland. This uptake varied according to the physiological state of the bird. Calculations based on the rates of clearance of intravenous (6,7-3H) 17β-oestradiol indicate that in the adult bird the rate of secretion by the ovary is of the order of 1–2.0 mg oestradiol/24 h.

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