scholarly journals Analysis of cyclic feed intake in rats fed on a zinc-deficient diet and the level of dihydropyrimidinase (EC 3.5.2.2)

1995 ◽  
Vol 73 (5) ◽  
pp. 711-722 ◽  
Author(s):  
Nanaya Tamaki ◽  
Shigeko Fujimoto-Sakata ◽  
Mariko Kikugawa ◽  
Masae Kaneko ◽  
Satomi Onosaka ◽  
...  
Keyword(s):  
Body Weight ◽  
Feed Intake ◽  
Weight Change ◽  
The Body ◽  
Body Weight Change ◽  
Weight Changes ◽  
Deficient Diet ◽  
Cyclic Variations ◽  
Zinc Deficient Diet ◽  
And Control

The body weight and feed intake of rats fed on a Zn-deficient diet for 28 d were reduced compared with those of control rats. The feed intakes of the Zn-deficient and control groups during the period were 10·2 (SE 0·3) and 15·7 (SE 0·2) g/d respectively. Cyclic variations in feed intake and body-weight changes were found in analysis not only of all the data for five rats but also that in each individual rat. Cosinor analysis revealed that the cyclical period of both the feed intake and body-weight change in the Zn-deficient rats was 3·5 (SE 0·1) d. The mesor and amplitude value of the feed intake in the Zn-deficient rats was 10 1 (SE 0·4) g/d and 3·5 (SE 0·5) g/d respectively, and that of body-weight change was 1·4 (SE 0·1) g/d and 7·9 (SE 1·3) gObihiro d respectively. Among pyrimidine-catabolizing enzymes, dihydropyrimidinase (EC3.5.2.2) activity showed significantretardation in the Zn-deficient rat liver with decrease of the enzyme protein. The ratio of apo-form to holo-form dihydropyrimidinase in the liver was not affected by the Zn-deficient diet.

scholarly journals The Relation Between the Responses of Wool Growth and Body Weight to Changes in Feed Intake

1962 ◽  
Vol 15 (4) ◽  
pp. 720 ◽  
Author(s):  
KA Ferguson
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Feed Intake ◽  
Weight Change ◽  
Productive Efficiency ◽  
Intake Rate ◽  
Body Weight Change ◽  
Growth Responses ◽  
Wool Growth

The wool growth responses to changes in feed intake are related to the changes produced in body weight. The relation is expressed by the equation W = Ei-kG, where W = wool growth rate, i = feed intake rate, G = rate of body weight change, and E and k are constants. The ratio of E to k in sheep of different productive efficiency was found to be constant.

Body weight and wool production in grazing sheep given access to a supplement of urea and molasses: intake of supplement/response relationships

1975 ◽  
Vol 84 (1) ◽  
pp. 39-48 ◽  
Author(s):  
J. V. Nolan ◽  
B. W. Norton ◽  
R. M. Murray ◽  
F. M. Ball ◽  
F. B. Roseby ◽  
...  
Keyword(s):  
Body Weight ◽  
Weight Change ◽  
Tritiated Water ◽  
Parasite Burden ◽  
Poor Quality ◽  
The Body ◽  
Body Weight Change ◽  
Once Daily ◽  
Faecal Egg Count ◽  
The Relationship

SUMMARYA technique for estimating the intake of liquid supplements by individual, grazing animals was used in a trial with 200 sheep grazing poor quality pasture and given access to a urea-molasses supplement (19%, w/v).A mathematical procedure was developed to estimate intake of supplement based on measurements of the accumulation of tritiated water (TOH) and its rate of turnover in the body of each animal after a TOH-labelled mixture had been available for a period of 7 days.In calculating the level of intake of labelled supplement, it was assumed that each animal ingested the mixture once daily over the 7-day period, since animals were observed to take the supplement daily and the daily loss of supplement from the dispenser was noarly constant. It was estimated that the combined intakes of the animals accounted for 87% of the known total loss of labelled supplement from the dispenser.Of the 200 sheep, 97 did not consume any supplement and among the other 103 animals, estimated intake varied from 5 to 550 ml/day.All sheep lost body weight during the trial, but those consuming the supplement lost significantly less weight, and grew significantly more wool during the period of supplementation, than did the sheep that did not consume the supplement.A small but significant amount of the variance (13%) in body-weight change and wool growth during supplementation was removed by multiple regression analysis, by including the intake of the supplement, faecal egg count (as an indication of parasite burden) and body weight at the start of the trial, as independent variables. Other factors not studied (e.g., dry matter intake) apparently accounted for a large proportion of the variance.The relationship between body-weight change and intake of the urea-molasses mixture was compatible with the hypothesis that the supplement was used largely as a concentrate feed, and not solely as a nitrogen supplement.

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