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Journal of animal science.
Publisher:
American Society of Animal Science
Frequency: Monthly,
Country: United States
Language: English
Author(s):
American Society of Animal Science., American Society of Animal Production.
Start Year:1942 -
ISSN:
0021-8812 (Print)
1525-3163 (Electronic)
0021-8812 (Linking)
1525-3163 (Electronic)
0021-8812 (Linking)
Impact Factor
3.3
| NLM ID: | 8003002 |
| (DNLM): | J12580000(s) |
| (OCoLC): | 01782370 |
| Coden: | JANSAG |
| Classification: | W1 JO536H |
Potassium metabolism in ponies. Potassium metabolism and some metabolic interractions of K, Mg and Ca were studied in a series of balance trials with ponies. The kidney was the primary pathway of K excretion. Increasing K intake markedly affected the renal excretion of K but had only small effects on fecal excretion. Increasing K intake increased retention and apparent digestibility of K. High levels of dietary Ca (3.4%) did not influence K metabolism but the highest level of Mg (.81%) increased the apparent digestibility of K. A level of 3.4% K did not decrease Mg, P or Ca digestibility and retention. The maintenance requir...
Plasma progestins in pregnant, postpartum and cycling mares. Jugular vein plasma from 13 mares was extracted with diethyl ether and chromatographed on Sephadex LH-20 columns (.5 × 9 cm) after which progesterone and 17α-hydroxyprogesterone (170HP) were quantified by a competitive protein binding radioassay. During pregnancy, progesterone increased (P < .05) from 1.1 ± .4 ng/ml (mean ± SE) on day 0 to 7.5 ± 1.2 ng/ml on day 8 followed by a transient (nonsignificant) decrease to 4.8 ± .4 ng/ml on day 28. From days 28 to 44 progesterone again increased (P < .05) attaining a maximum concentration of 15.2 ± 1.4 ng/ml on day 64. Thereafter progesterone ...
