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פותח על ידי קלירמאש פתרונות בע"מ -
Factors affecting response of groups of dairy cows managed for different calving-conception intervals
Year:
1991
Source of publication :
Theriogenology
Authors :
שינדלר, חיים
;
.
Volume :
36
Co-Authors:
Schindler, H., Institute of Animal Science, Agricultureal Research Organization Bet Dagan, 50250, Israel
Eger, S., Advisory Service, Ministry of Agriculture, Tel Aviv, Israel
Davidson, M., Veterinary Services, Ministry of Agriculture, Bet Dagan, Israel
Ochowski, D., Hahaklait Veterinary Clinical Services, Haifa, Israel
Schermerhorn, E.C., Department of Animal Science, Cornell University Ithaca, NY, United States
Foote, R.H., Department of Animal Science, Cornell University Ithaca, NY, United States
Facilitators :
From page:
495
To page:
503
(
Total pages:
9
)
Abstract:
Factors which positively or adversely affect the response of cow groups to different planned conception periods were analyzed and quantified. Cows were randomly assigned to groups for breeding at postpartum intervals of 35 to 59, 60 to 90 and 120 to 150 days in a research herd, or 60 to 90 and 120 to 150 days in a cooperating commercial herd, with a planned preceding dry period of 60 days in both herds. Breeding at 35 to 59 and 60 to 90 days post partum resulted in a lower conception rate among multiparous cows but had no effect on primiparous cows. Genital disorders such as metritis, retained placenta, vulva inflammation and vaginitis, did not affect the start of luteal activity or length of the subsequent cycles, but caused a significant delay of the first behavioral estrus and, cosequently, a delay of the first insemination in the earlier breeding groups. About 30% of the cows in the different categories were inseminated three or more times and were considered to be repeat breeders. Response rates (number of cows conceiving on time/number assigned) in the later breeding group improved due to higher submission rates (number of cows submitted on time/number assigned), and the conception rates were higher (number of cows conceiving on time/number submitted). The rates in all groups were adversely affected by repeat breeding and genital disorders. The latter delayed the first insemination and the conception rate. © 1991.
Note:
Related Files :
breeding management
Dairy cow
metritis
postpartum
repeat breeder
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/0093-691X(91)90478-V
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
27307
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:29
You may also be interested in
Scientific Publication
Factors affecting response of groups of dairy cows managed for different calving-conception intervals
36
Schindler, H., Institute of Animal Science, Agricultureal Research Organization Bet Dagan, 50250, Israel
Eger, S., Advisory Service, Ministry of Agriculture, Tel Aviv, Israel
Davidson, M., Veterinary Services, Ministry of Agriculture, Bet Dagan, Israel
Ochowski, D., Hahaklait Veterinary Clinical Services, Haifa, Israel
Schermerhorn, E.C., Department of Animal Science, Cornell University Ithaca, NY, United States
Foote, R.H., Department of Animal Science, Cornell University Ithaca, NY, United States
Factors affecting response of groups of dairy cows managed for different calving-conception intervals
Factors which positively or adversely affect the response of cow groups to different planned conception periods were analyzed and quantified. Cows were randomly assigned to groups for breeding at postpartum intervals of 35 to 59, 60 to 90 and 120 to 150 days in a research herd, or 60 to 90 and 120 to 150 days in a cooperating commercial herd, with a planned preceding dry period of 60 days in both herds. Breeding at 35 to 59 and 60 to 90 days post partum resulted in a lower conception rate among multiparous cows but had no effect on primiparous cows. Genital disorders such as metritis, retained placenta, vulva inflammation and vaginitis, did not affect the start of luteal activity or length of the subsequent cycles, but caused a significant delay of the first behavioral estrus and, cosequently, a delay of the first insemination in the earlier breeding groups. About 30% of the cows in the different categories were inseminated three or more times and were considered to be repeat breeders. Response rates (number of cows conceiving on time/number assigned) in the later breeding group improved due to higher submission rates (number of cows submitted on time/number assigned), and the conception rates were higher (number of cows conceiving on time/number submitted). The rates in all groups were adversely affected by repeat breeding and genital disorders. The latter delayed the first insemination and the conception rate. © 1991.
Scientific Publication
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