摘要:

Besides the genetic predisposition and the dietary supply of nutrients, environmental factors affect the performance of the pig. Environment can affect the nutrient composition and availability of the feed. It can also influence appetite and therefore the feed intake. Furthermore, nutrient and energy utilization on the level of digestion and intermediate metabolism can depend on environmental factors. Especially the energy requirements of the pig are determined by such factors like physical activity or climate. Finally, stress or disease are interacting with the environment, nutrient and energy utilization as well as performance of the pigs.

ISSN:0003-942X    

DOI:10.1080/17450399809381920

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Domesticated animals all over the world are subjected to a wide variety of environmental conditions and challenges. Any deviation from “normal”; may result in adaptive behavior of which changes in feed intake or feed intake pattern is by far the most important. Adaptive behavior may further include influences on passage rate of feed residues through the digestive tract, resulting in changes in digestibility. Adaptive behavior may also result in changes in heat production, either to maintain body temperature constant, or as a result of an elevated body temperature.

ISSN:0003-942X    

DOI:10.1080/17450399809381921

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Endogenous nitrogen and amino acid losses are associated with the digestion process. Different methods can be used to distinguish between gut endogenous and exogenous amino acid flows. These methods include feeding N‐free diets, the regression approach, the use of enzyme hydrolysed proteins coupled with ultrafiltra‐tion and the use of markers (e.g.,homoarginine, enzyme hydrolysed casein,15N‐labelled protein,15N‐leucine). All of the methods described have their limitations, but they have allowed major advances to be made in the measurement and understanding of endogenous amino acid secretion, reabsorption, flow and excretion.

ISSN:0003-942X    

DOI:10.1080/17450399809381922

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

ISSN:0003-942X    

DOI:10.1080/17450399809381909

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor