摘要:

Different methods of optimizing feed conversion into nutrients in the rumen are now available to scientists. But the rumen must be considered as an integrated system and this makes it difficult to rationalize manipulation. The observed result of any treatment is a combination of several interactive reactions. Any change to one component of the system has several uncontrolled effects on other components. The positive effects aimed for are sometimes associated with undesirable effects.

ISSN:0003-942X    

DOI:10.1080/17450399409381766

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The investigation was attempted to clarify the effects of fish oil on the concentration of lipids in serum and lipoproteins in rats fed diets differing in cholesterol and fat. Male Sprague‐Dawley rats were maintained on low‐fat/high‐fat diets without and with 1.5%cholesterol (base diets) for 28 days. Half of each group was then switched to a fish oil diet for 20 days with 5.6% fish oil for exchange of coconut oil and beef tallow.

ISSN:0003-942X    

DOI:10.1080/17450399409381767

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

Fourty‐two Wistar FL tribe rats were divided into control groups, fed a high‐fat diet or subjected to surgical reduction of stomach capacity by 75%. After 60 days of experiment we observed decrease of animal body weight gain, as well as decrease of ornithine transcarbamylase and arginase activity. As indicated by the activity of these enzymes high‐fat diet leads to an increase in urea cycle activity probably due to metabolic and hormonal imbalance. The utilisation of carbamoylphosphate for the pyrimidine biosynthesis pathway did not seem to change the ATC‐ase activity.

ISSN:0003-942X    

DOI:10.1080/17450399409381768

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The energy and nitrogen metabolism of pregnant sows was measured with the method of indirect calorimetry in dependence on the number of gestation (1, 2 and 4), on the energy supply (120, 100 and 80% of the requirement recommendation) and on the gestation stage. Values of maintenance requirement and of energy and nitrogen utilization for body deposition were calculated on the basis of results of energy and nitrogen metabolism. The energy maintenance requirement increased from 389 to 435 and 473 kj metabolizable energy per kg LW0.75·d with rising number of gestation. The heat production increased from 85thto 115thday of gestation by 6%.The efficiency of the partial energy utilization for the energy deposition amounted to 66% on the average. The efficiency of the partial utilization of digestible nitrogen for the nitrogen deposition was calculated to 75%. The nitrogen maintenance requirement values amounted to 0.5 and 0.4g digestible nitrogen per kg LW0.75·d in the Istand 2ndhalf of gestation.

ISSN:0003-942X    

DOI:10.1080/17450399409381769

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The influence of physical treatment‐expansion and flaking‐on crude proteins degradability in the rumen was studied in maize, maize‐gluten feed, rape extracted meal and in the expanded one at 120°C and 150°C, rape cake, wheat and flaked wheat by in sacco method. The enzymatic digestibility of crude protein in the rumen undegraded residues of the above mentioned feeds was determined by an enzymatically in vitro method.

ISSN:0003-942X    

DOI:10.1080/17450399409381770

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

ISSN:0003-942X    

DOI:10.1080/17450399409381765

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor