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פותח על ידי קלירמאש פתרונות בע"מ -
Sewage-Grown Algae as a Source of Supplementary Nitrogen for Ruminants
Year:
1981
Authors :
בן גדליה, דניאל
;
.
חסדאי, אהרון
;
.
Volume :
97
Co-Authors:
Hasdai, A., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan, Israel
Ben-Ghedalia, D., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan, Israel
Facilitators :
From page:
533
To page:
537
(
Total pages:
5
)
Abstract:
A sheep-feeding experiment was carried out to assess the nutritional value of algae meal as a protein supplement in ruminant diets. The algae, mainly Chlorella, were grown in sewage ponds, harvested by flocculation with alumina (A12(S04)3.18H20), and then drum-dried. Eight young rams, divided into two equal groups, were offered a basal concentrated diet, to which algae meal or soya-bean meal (SBM) was added to contribute 50% of the dietary nitrogen (N).The digestibility values of dry matter (d.m.) were 69-3 and 79-3 %, and those of organic matter (OM) were 75-3 and 82-2 % for the algae diet and the SBM diet, respectively.Nitrogen digestibility of the algae diet was 16% lower than that of the SBM diet and the calculated value of N digestibility in algae meal was 61-7%. However, there was no difference between treatments in the daily amount of retained-N or in the proportion of digested N which was retained in the body.The algae meal contained 5-7% aluminium. This was probably the reason for the much lower P absorption in the algae diet (6-67%) as compared with the SBM diet (29-5%).Ammonia-N concentration was lower and total volatile fatty acids (VFA) concentration was higher in the rumen of the algae diet-fed sheep. However, the VFA profile was similar for both diets.Sewage-grown algae could perhaps be used as a protein supplement for ruminants, provided that the harvesting technology is directed to produce a low-mineral, low-aluminium, young biomass, which would be highly digestible and would not interfere with P absorption. © 1981, Cambridge University Press. All rights reserved.
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More details
DOI :
10.1017/S0021859600036856
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
31089
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:59
Scientific Publication
Sewage-Grown Algae as a Source of Supplementary Nitrogen for Ruminants
97
Hasdai, A., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan, Israel
Ben-Ghedalia, D., Institute of Animal Science, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan, Israel
Sewage-Grown Algae as a Source of Supplementary Nitrogen for Ruminants
A sheep-feeding experiment was carried out to assess the nutritional value of algae meal as a protein supplement in ruminant diets. The algae, mainly Chlorella, were grown in sewage ponds, harvested by flocculation with alumina (A12(S04)3.18H20), and then drum-dried. Eight young rams, divided into two equal groups, were offered a basal concentrated diet, to which algae meal or soya-bean meal (SBM) was added to contribute 50% of the dietary nitrogen (N).The digestibility values of dry matter (d.m.) were 69-3 and 79-3 %, and those of organic matter (OM) were 75-3 and 82-2 % for the algae diet and the SBM diet, respectively.Nitrogen digestibility of the algae diet was 16% lower than that of the SBM diet and the calculated value of N digestibility in algae meal was 61-7%. However, there was no difference between treatments in the daily amount of retained-N or in the proportion of digested N which was retained in the body.The algae meal contained 5-7% aluminium. This was probably the reason for the much lower P absorption in the algae diet (6-67%) as compared with the SBM diet (29-5%).Ammonia-N concentration was lower and total volatile fatty acids (VFA) concentration was higher in the rumen of the algae diet-fed sheep. However, the VFA profile was similar for both diets.Sewage-grown algae could perhaps be used as a protein supplement for ruminants, provided that the harvesting technology is directed to produce a low-mineral, low-aluminium, young biomass, which would be highly digestible and would not interfere with P absorption. © 1981, Cambridge University Press. All rights reserved.
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