Modeling Feed Intake In Growing-Finishing Pigs.Effects of Animal Density, Diet Energy Density, Environmental Temperature and Sex

2002 ◽  
Author(s):  
Vasco Fitas da Cruz and J. Le Dividich
Keyword(s):  
Energy Density ◽  
Feed Intake ◽  
Environmental Temperature ◽  
Animal Density

scholarly journals Effect of diet energy density and genomic residual feed intake on prebred dairy heifer feed efficiency, growth, and manure excretion

2019 ◽  
Vol 102 (5) ◽  
pp. 4041-4050
Author(s):  
K.T. Williams ◽  
K.A. Weigel ◽  
W.K. Coblentz ◽  
N.M. Esser ◽  
H. Schlesser ◽  
...  
Keyword(s):  
Energy Density ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Residual Feed Intake ◽  
Dairy Heifer

The effect of ambient temperature on feed intake and diet selection in growing lambs

1992 ◽  
Vol 1992 ◽  
pp. 166-166
Author(s):  
M.R. Cropper ◽  
D.P. Poppi
Keyword(s):  
Ambient Temperature ◽  
Protein Content ◽  
Feed Intake ◽  
Free Choice ◽  
Environmental Temperature ◽  
Diet Selection ◽  
High Ambient Temperature

Lambs are known to change their feed intake in relation to environmental temperature (Blaxter, 1962). However, their ability to select a non-limiting diet, when free-choice fed, has only been investigated in a thermoneutral environment (Cropper, 1987). The aim of this experiment was to test the idea that, at low and high ambient temperature, (a) feed intake would increase in the cold and decrease in the hot, relative to a thermoneutral control, and that (b) the protein content of the diet selected would be lower and higher respectively.

Effects of feed intake and environmental temperature on chick growth and development

1993 ◽  
Vol 121 (3) ◽  
pp. 421-425 ◽  
Author(s):  
M. O. Smith ◽  
R. G. Teeter
Keyword(s):  
Feed Intake ◽  
United States Of America ◽  
Feed Efficiency ◽  
Growth And Development ◽  
Environmental Temperature ◽  
Southeastern United States ◽  
Broiler Chicks ◽  
Chick Growth ◽  
Ad Libitum ◽  
Environmental Temperatures

SUMMARYBroiler chicks reared under three environmental temperatures (7·2, 23·9 and 35 °C) in the Southeastern United States of America in 1988/89 were precision-fed to levels which were c. 70, 90, 110 and 130% of the consumption observed in ad libitum-fed controls at 23·9°C, in order to examine the limitations imposed by feed intake upon growth rate, feed efficiency and survival. Ad libitum-fed birds that were housed at 7·2, 23·9 and 35 °C consumed feed at 12·1, 9·4 and 8·5% of body weight, respectively. Liveweight gain of birds consuming feed ad libitum was depressed by 26 and 46% in the 7·2 and 35 °C environments respectively. Increasing feed intake by precision feeding exceeded ad libitum consumption in the 23·9 and 35 °C environments, but not at 7·2 °C. Consumption of feed above thermoneutral ad libitum levels failed to increase (p <0·l) liveweight of carcass gain. Ration digestibility and dressing out percentage declined (P < 0·05) at the higher feed intake levels in the 7·2 °C environment.

Adaptation of growing pigs to changes in environmental temperature

1971 ◽  
Vol 13 (1) ◽  
pp. 51-57 ◽  
Author(s):  
S. R. Morrison ◽  
L. E. Mount
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Respiratory Rate ◽  
Temperature Change ◽  
Water Intake ◽  
Rectal Temperature ◽  
Feed Intake ◽  
Environmental Temperature ◽  
Growing Pigs ◽  
Ad Libitum

SUMMARYPigs fed ad libitum were exposed to changes from 22 to 33°C and from 33 to 20°C. Responses were investigated in two groups of animals kept for three successive periods of four weeks at 22°, 33° and finally 20°C.Twenty-four hr after the first change, from 22 to 33°C, there was a decline in body weight; after the second change, from 33 to 20°C, there was a large increase. After the change to 33°C, feed intake by the second day and growth rate for the first week were about the same as at the end of the four weeks, but about 12 days were required for water intake, rectal temperature and respiratory rate to reach steady values.After the change from 33 to 20°C, steady values for respiratory rate and rectal temperature were reached in one and 12 days respectively. The rate of gain in weight increased to reach a peak nine days following the temperature change and then declined.

The response of pigs weaned at 5 weeks of age to digestible energy and lysine concentrations in the diet

1978 ◽  
Vol 26 (3) ◽  
pp. 287-291 ◽  
Author(s):  
J. F. O'Grady
Keyword(s):  
Energy Density ◽  
Feed Intake ◽  
Lower Energy ◽  
Experimental Period ◽  
Similar Rate ◽  
Energy Utilization ◽  
Average Weight ◽  
Feed Conversion ◽  
Digestible Energy ◽  
Lower Energy Density

AbstractEight-hundred-and-fifty-two pigs were weaned at 5 weeks of age, and at an average weight of 8·5 kg were allocated in pens of 14 or 15 to diets having 13·6 or 14·6 MJ digestible energy (DE)/kg combined with 11·0 or 11·8 g lysine per kg.Over a 5-week experimental period, pigs receiving the diet with the higher DE content had a lower daily feed intake, improved feed conversion efficiency (FCE) but a similar rate of gain to those getting less DE/kg. Efficiency of utilization of energy was poorer when DE content was higher.Increasing lysine level increased daily feed intake and rate of gain while improving FCE. There were significant energy x lysine interactions. At the lower energy density, increasing the lysine level resulted in increased daily feed intakes whereas the reverse was the case at the higher energy density. Daily gain increased when lysine level was increased at the lower energy density but was unaffected at the higher density. Efficiency of energy utilization was improved by increasing lysine at the higher but not at the lower energy level.

scholarly journals Effect of changes in diet energy density on feed intake, milk yield and metabolic parameters in dairy cows in early lactation

animal ◽  
2007 ◽  
Vol 1 (3) ◽  
pp. 335-346 ◽  
Author(s):  
N.I. Nielsen ◽  
N.C. Friggens ◽  
T. Larsen ◽  
J.B. Andersen ◽  
M.O. Nielsen ◽  
...  
Keyword(s):  
Energy Density ◽  
Dairy Cows ◽  
Milk Yield ◽  
Feed Intake ◽  
Metabolic Parameters ◽  
Early Lactation
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