נגישות
menu      
חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Uniform monthly milk production in Israel by planned breeding of replacement heifers: Results of a simulation study
Year:
1992
Source of publication :
Animal Production
Authors :
לרר, רמי
;
.
Volume :
54
Co-Authors:
Kahn, H.E., Institute of Animal Science, Bet Dagan 50 250, Israel
Lehrer, A.R., Institute of Animal Science, Bet Dagan 50 250, Israel
Facilitators :
From page:
1
To page:
6
(
Total pages:
6
)
Abstract:
Both milk production (MP) and conception rate (CR) of primi-and multiparous cows (P+M) in Israel are characterized by the same summer-autumn trough and winter-spring peak. Although there is no causal link between CR and MP (a simulation-model study explained the connection), monthly CR determines the number of dry cows 7 months later, at 2 months pre-calving. Inevitably, when the number of dry cows is low, MP is high, and vice versa. Replacement heifers (RH) in Israel have a consistently high (64%) CR throughout the year. The same simulation model was used to investigate the effect of manipulated RH breeding on the herd MP pattern. When RH breeding was confined to the 3-month July to September (J-S) period during which CR is lowest for post-partum P+Ms, the monthly MP pattern in an otherwise year-round breeding dairy herd was the diametric opposite of the one produced by all-year RH breeding. When a uniform monthly quota was set for RH and P+M conceptions, and monthly RH conceptions were restricted to complement monthly P+M conceptions, the herd MP pattern became almost level. There did not appear to be any economic penalty attached to the planned RH conception system. In practice it will not be possible to adhere to a strict monthly quota of conceptions, since there is a 1 to 2 month lag between insemination and confirmed conception. Estimates of individual farm monthly CR could be used, where available. Alternatively, if 40% of all RH inseminations were performed in J-S, the MP curve would be much flatter than under the present non-planned system of RH insemination. © 1992, British Society of Animal Science. All rights reserved.
Note:
Related Files :
conception rate
Milk production
replacement rate
seasonal fluctuations
Simulation model
עוד תגיות
תוכן קשור
More details
DOI :
10.1017/S0003356100020493
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
26326
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:21
You may also be interested in
Scientific Publication
Uniform monthly milk production in Israel by planned breeding of replacement heifers: Results of a simulation study
54
Kahn, H.E., Institute of Animal Science, Bet Dagan 50 250, Israel
Lehrer, A.R., Institute of Animal Science, Bet Dagan 50 250, Israel
Uniform monthly milk production in Israel by planned breeding of replacement heifers: Results of a simulation study
Both milk production (MP) and conception rate (CR) of primi-and multiparous cows (P+M) in Israel are characterized by the same summer-autumn trough and winter-spring peak. Although there is no causal link between CR and MP (a simulation-model study explained the connection), monthly CR determines the number of dry cows 7 months later, at 2 months pre-calving. Inevitably, when the number of dry cows is low, MP is high, and vice versa. Replacement heifers (RH) in Israel have a consistently high (64%) CR throughout the year. The same simulation model was used to investigate the effect of manipulated RH breeding on the herd MP pattern. When RH breeding was confined to the 3-month July to September (J-S) period during which CR is lowest for post-partum P+Ms, the monthly MP pattern in an otherwise year-round breeding dairy herd was the diametric opposite of the one produced by all-year RH breeding. When a uniform monthly quota was set for RH and P+M conceptions, and monthly RH conceptions were restricted to complement monthly P+M conceptions, the herd MP pattern became almost level. There did not appear to be any economic penalty attached to the planned RH conception system. In practice it will not be possible to adhere to a strict monthly quota of conceptions, since there is a 1 to 2 month lag between insemination and confirmed conception. Estimates of individual farm monthly CR could be used, where available. Alternatively, if 40% of all RH inseminations were performed in J-S, the MP curve would be much flatter than under the present non-planned system of RH insemination. © 1992, British Society of Animal Science. All rights reserved.
Scientific Publication
You may also be interested in