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פותח על ידי קלירמאש פתרונות בע"מ -
The ratio between dietary rumen degradable organic matter and crude protein may affect milk yield and composition in dairy sheep
Year:
2005
Source of publication :
Small Ruminant Research
Authors :
ברוקנטל, ישראל
;
.
ברעם, חגית
;
.
ליפשיץ, ל'
;
.
לנדאו, יאן
;
.
מבג'יש, סמיר
;
.
ניצן, רונית
;
.
סילניקוב, ניסים
;
.
Volume :
58
Co-Authors:
Landau, S., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Kababya, D., Sheep and Goats Department, Extension Service, Ministry of Agriculture, Bet Dagan 50250, Israel
Silanikove, N., Department of Cattle, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Nitsan, R., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Lifshitz, L., Department of Cattle, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Baram, H., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Bruckental, I., Department of Cattle, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Mabjeesh, S.J., Department of Animal Science, Fac. Agric., Food Environ. Qual. S., Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Facilitators :
From page:
115
To page:
122
(
Total pages:
8
)
Abstract:
The current ruminant protein systems aim at synchronizing the provision of rumen degradable organic matter (RDOM) and degradable crude protein (RDCP) but no specific information on their optimal ratio for dairy sheep is available. We studied the effect of the ratio of RDOM to RDCP on milk yield and composition, during a summer lactation, in 34 confined Assaf sheep managed under farm condition. Individual feed intake was assessed by using PEG (MW 4000) as external marker of fecal output, and indigestible INDF as internal marker of digestibility. Four total mixed rations contained two levels of RDCP (108 and 117 g/kg DM) and two levels of RDOM (510 and 570 g/kg DM). This resulted in one diet featuring high (5.3), one diet featuring medium (4.8) ratio, and two diets featuring low (4.5) ratio of RDOM to RDCP. Individual DM intake, digestibility, and the daily yields of milk components were not affected by RDOM, RDCP or RDOM/RDCP. High RDOM/RDCP tended (P < 0.10) to be associated with higher milk yield, and lower (P < 0.05) CP content. The casein/CP ratio and urea-N in milk were lowest when both dietary RDCP and RDOM were low, whereas lactose was highest (P < 0.05) when both RDOM and RDCP concentrations were high. Our data suggest that RDOM and RDCP interact on milk composition in a way that is not fully encompassed by the RDOM/RDCP ratio and that the use of this ratio to formulate diets for pre-determined milk composition is not warranted. © 2004 Elsevier B.V. All rights reserved.
Note:
Related Files :
Assaf sheep
Bovidae
Ewe milk composition
Ovis aries
Rumen degradable crude protein
Rumen degradable organic matter
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.smallrumres.2004.09.014
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
31012
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:59
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Scientific Publication
The ratio between dietary rumen degradable organic matter and crude protein may affect milk yield and composition in dairy sheep
58
Landau, S., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Kababya, D., Sheep and Goats Department, Extension Service, Ministry of Agriculture, Bet Dagan 50250, Israel
Silanikove, N., Department of Cattle, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Nitsan, R., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Lifshitz, L., Department of Cattle, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Baram, H., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Bruckental, I., Department of Cattle, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Mabjeesh, S.J., Department of Animal Science, Fac. Agric., Food Environ. Qual. S., Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
The ratio between dietary rumen degradable organic matter and crude protein may affect milk yield and composition in dairy sheep
The current ruminant protein systems aim at synchronizing the provision of rumen degradable organic matter (RDOM) and degradable crude protein (RDCP) but no specific information on their optimal ratio for dairy sheep is available. We studied the effect of the ratio of RDOM to RDCP on milk yield and composition, during a summer lactation, in 34 confined Assaf sheep managed under farm condition. Individual feed intake was assessed by using PEG (MW 4000) as external marker of fecal output, and indigestible INDF as internal marker of digestibility. Four total mixed rations contained two levels of RDCP (108 and 117 g/kg DM) and two levels of RDOM (510 and 570 g/kg DM). This resulted in one diet featuring high (5.3), one diet featuring medium (4.8) ratio, and two diets featuring low (4.5) ratio of RDOM to RDCP. Individual DM intake, digestibility, and the daily yields of milk components were not affected by RDOM, RDCP or RDOM/RDCP. High RDOM/RDCP tended (P < 0.10) to be associated with higher milk yield, and lower (P < 0.05) CP content. The casein/CP ratio and urea-N in milk were lowest when both dietary RDCP and RDOM were low, whereas lactose was highest (P < 0.05) when both RDOM and RDCP concentrations were high. Our data suggest that RDOM and RDCP interact on milk composition in a way that is not fully encompassed by the RDOM/RDCP ratio and that the use of this ratio to formulate diets for pre-determined milk composition is not warranted. © 2004 Elsevier B.V. All rights reserved.
Scientific Publication
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