אסיף מאגר המחקר החקלאי

Homeostatic responses to water deprivation or hemorrhage in lactating and non-lactating bedouin goats

Year:

1984

Source of publication :

Authors :

Volume :

77

Co-Authors:

Maltz, E., Department of Zoology, the George S. Wise Center for Life Sciences, Tel-Aviv University, Tel-Aviv, Israel
Olsson, K., Department of Zoology, the George S. Wise Center for Life Sciences, Tel-Aviv University, Tel-Aviv, Israel, Department of Animal Physiology, Swedish University of Agricultural Sciences, 75007 Uppsala, Sweden
Click, S.M., Department of Zoology, the George S. Wise Center for Life Sciences, Tel-Aviv University, Tel-Aviv, Israel, Soroka Medical Center, Ben Gurion University Health Sciences Center, Be'er-Sheba, Israel
Fyhrquist, F., Department of Zoology, the George S. Wise Center for Life Sciences, Tel-Aviv University, Tel-Aviv, Israel, Minerva Institute for Medical Research, B.P. 819, SF-00101 Helsinki, Finland
Silanikove, N., Department of Zoology, the George S. Wise Center for Life Sciences, Tel-Aviv University, Tel-Aviv, Israel
Choshniak, I., Department of Zoology, the George S. Wise Center for Life Sciences, Tel-Aviv University, Tel-Aviv, Israel
Shkolnik, A., Department of Zoology, the George S. Wise Center for Life Sciences, Tel-Aviv University, Tel-Aviv, Israel

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Abstract:

1. 1. Three lactating and three non-lactating black Bedouin goats were subjected to four days of water deprivation or to hemorrhage. 2. 2. Four days of water deprivation caused body wt losses of 32 and 23% and plasma volume losses of 30 and 34% in lactating and non-lactating goats respectively. 3. 3.Plasma osmolality increased 17 and 15% in lactating and non-lactating goats. Plasma arginine vasopressin concentration rose from about 5 pg/ml to a mean of 36 pg/ml. Plasma renin activity increased from about 0.7 ng/ml/hr to a mean of 3.45 ng/ml/hr in lactating and to 3.15 ng/ml/hr in non-lactating goats. 4. 4. At 4.5 hr post-rehydration plasma osmolality and plasma vasopressin concentration were back to normal in non-lactating, but still elevated in lactating goats. Plasma renin activity increased after rehydration. 5. 5. Rapid blood volume loss of 21-28% increased plasma vasopressin concentration to 16-35 pg/ml in non-lactating and to 70 or > 500 pg/ml in lactating goats. 6. 6. It is concluded that black Bedouin goats are well adapted to endure severe dehydration and rapid rehydration, but that they (especially lactating animals) react strongly to rapid volume depletion. © 1984.

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