Effects of oxygen concentration during incubation and broiler breeder age on embryonic heat production, chicken development, and 7-day performance

1. Sheep given constant feed were exposed to environments in which the oxygen concentration in air was either 200 or 150 ml/l. There were no differences in daily heat production, methane production, urinary energy or faecal energy losses measured over periods of 4 d.2. When the sheep were fasted there were no differences in heat production to be ascribed to the O2 concentration in air. The thermic response to feed was unaffected by the O2 concentration in the air.

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On the calculation of heat production from open-circuit calorimetric measurements

British Journal Of Nutrition ◽

10.1079/bjn19720130 ◽

1972 ◽

Vol 27 (3) ◽

pp. 597-600 ◽

Cited By ~ 89

Author(s):

J. A. McLean

Keyword(s):

Oxygen Concentration ◽

Heat Production ◽

Methane Production ◽

Respiratory Quotient ◽

Ventilation Rate ◽

Open Circuit ◽

Calorimetric Measurements ◽

Ruminant Animals ◽

New Form

1. The equation used for calculating heat production of ruminant animals is expressed in a new form, convenient for application to open-circuit calorimetry.2. It is shown that in open-circuit calorimetry the possible error involved in making the assumption that respiratory quotient is equal to unity is small compared with the possible error involved in neglecting methane production.3. In open-circuit calorimetry heat production can be predicted with accuracy to within ± 2% solely from the measurement of oxygen concentration and ventilation rate.

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Effects of Incubational Oxygen Concentration on Fatty Acid Metabolism and Heme Synthesis in Broiler Breeder Embryos

The Journal of Poultry Science ◽

10.2141/jpsa.0140175 ◽

2015 ◽

Vol 52 (3) ◽

pp. 213-216

Author(s):

Nobumichi Tsushima ◽

Yoshiyuki Ohta

Keyword(s):

Fatty Acid ◽

Oxygen Concentration ◽

Fatty Acid Metabolism ◽

Acid Metabolism ◽

Broiler Breeder ◽

Heme Synthesis

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HEAT PRODUCTION OF SKIP-A-DAY AND DAILY FED BROILER BREEDER PULLETS

Canadian Journal of Animal Science ◽

10.4141/cjas90-078 ◽

1990 ◽

Vol 70 (2) ◽

pp. 667-671 ◽

Cited By ~ 3

Author(s):

C. D. BENNETT ◽

S. LEESON ◽

H. S. BAYLEY

Keyword(s):

Nutrient Availability ◽

Heat Production ◽

Feed Intake ◽

Open Circuit ◽

Feed Restriction ◽

Lower Body ◽

Diurnal Pattern ◽

Broiler Breeder ◽

Body Weights ◽

Feeding Regimen

Four broiler breeder pullets were reared on a skip-a-day feeding regimen according to breeder recommendations; another four pullets were fed daily the same average feed intake as the skip-a-day fed birds. At 15–17 wk of age the average and diurnal pattern of heat production and respiration quotients were determined using an open-circuit respiration calorimeter. Lower body weights of the skip-a-day fed birds may have been due to the day-to-day fluctuation in nutrient availability. Skip-a-day fed birds produced more heat per kilogram body mass. The diurnal pattern of heat production and respiration quotients indicated that skip-a-day fed birds were absorbing nutrients on the feed-day but were fasting for most of the off-feed day. Key words: Broiler breeder, feed restriction, heat production

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High-resolution transmission electron microscopic study of highly oxygen doped silicon layer

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100155438 ◽

1989 ◽

Vol 47 ◽

pp. 692-693

Author(s):

H. Takaoka ◽

M. Tomita ◽

T. Hayashi

Keyword(s):

High Resolution ◽

Oxygen Concentration ◽

Silicon Layer ◽

Detailed Structure ◽

Electron Microscopic ◽

Cross Sectional ◽

Transmission Electron ◽

Doped Silicon ◽

Argon Ion

High resolution transmission electron microscopy (HRTEM) is the effective technique for characterization of detailed structure of semiconductor materials. Oxygen is one of the important impurities in semiconductors. Detailed structure of highly oxygen doped silicon has not clearly investigated yet. This report describes detailed structure of highly oxygen doped silicon observed by HRTEM. Both samples prepared by Molecular beam epitaxy (MBE) and ion implantation were observed to investigate effects of oxygen concentration and doping methods to the crystal structure.The observed oxygen doped samples were prepared by MBE method in oxygen environment on (111) substrates. Oxygen concentration was about 1021 atoms/cm3. Another sample was silicon of (100) orientation implanted with oxygen ions at an energy of 180 keV. Oxygen concentration of this sample was about 1020 atoms/cm3 Cross-sectional specimens of (011) orientation were prepared by argon ion thinning and were observed by TEM at an accelerating voltage of 400 kV.

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