Predicting Feed Intake of Food-Producing Animals (1987) / Chapter Skim
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4. Poultry
4. Poultry
Pages 42-47
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From page 42... ...
Glucostatic Theory The glucostatic theory of feed intake regulation, as generally recognized in mammals, either is not present 42 in birds or is not readily detectable by normal protocols (Richardson, 1970; Smith and Bright-Taylor, 1974~. Food intake has not been augmented as it has in mammals after the implantation of gold thioglucose directly into several hypothalamic structures (Smith and Szper, 1976)
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From page 43... ...
Infusion of histidine via the carotid artery significantly increased food intake, whereas infusion via the jugular vein did not. Thus, infusion via the carotid artery rectifies the pattern of amino acids passing to the brain, causing the cockerel to respond as if the dietary amino acid pattern were balanced.
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From page 44... ...
Rather, the emphasis has been upon estimating either total feed intake, by assuming a constant dietary energy, or upon estimating an energy requirement, thus allowing for an estimation of feed intake from knowledge of the dietary energy content. As more studies are conducted on the estimation of true metabolizable energy, amino acid digestion, and carcass retention of nutrients, more emphasis likely will be given to dry matter intake.
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From page 45... ...
CALCUATIONS OF DRY MATTER INTAKE Using equations 1, 2, 8, and 9 given above and typical production standards, estimates of daily dry matter consumption have been made for laying hens (Table 4-1) and broilers (Table 4-2~.
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From page 46... ...
With the growing interest in modeling as a means of estimating nutrient require ments, additional data will undoubtedly be developed with regard to ME needs. Since it is likely that poultry will continue to be fed diets based largely on lowmoisture ingredients, accurate estimates of dry matter intakes for these animals will be obtained primarily through knowledge of energy consumption.
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From page 47... ...
1971. Importance of the prepyriform cortex in food intake response of rats to amino acids.
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