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פותח על ידי קלירמאש פתרונות בע"מ -
Milk progesterone measurement in dairy cows: Correlation with estrus and pregnancy determination
Year:
1978
Source of publication :
Theriogenology
Authors :
שינדלר, חיים
;
.
Volume :
9
Co-Authors:
Shemesh, M., Dept. of Hormone Research, Kimron Veterinary Institute, Beit Dagan, Israel
Ayalon, N., Dept. of Reproduction, Kimron Veterinary Institute, Beit Dagan, Israel
Shalev, E., Kibbutz Givat Haim Hamuhad, Israel
Nerya, A., Kibbutz Givat Haim Hamuhad, Israel
Schindler, H., Division of Animal Reproduction, Volcani Center, Beit Dagan, Israel
Milguir, F., Dept. of Hormone Research, Kimron Veterinary Institute, Beit Dagan, Israel
Facilitators :
From page:
343
To page:
352
(
Total pages:
10
)
Abstract:
Progesterone levels in fore milk, determined by a highly specific radioimmunoassay, were compared for the assessment of estrus by a veteran herdsman and an experienced inseminator, in cows presented for insemination. In addition, an examination was made of the relative accuracy of using milk progesterone levels for the determination of pregnancy at 24, 40 and 44 days after insemination, as compared with rectal palpation at 45-50 days post-breeding. Fat-free fore milk progesterone levels were similar to jugular plasma levels at 24 days post-insemination and reached roughly 60% of the level of unextracted fore milk at this time. Accuracy of estrus diagnosis by herdsman, inseminator and milk progesterone level was 84%, 93% and 96%, respectively. For pregnancy diagnosis, milk progesterone determination in 85 cows showed 78% accuracy in predicting pregnancy and 100% accuracy in predicting non-pregnancy. At 40 days post-insemination false positives dropped to 10% and at 44 days only 7% of the cows were incorrectly diagnosed as pregnant. The false positives in this study were largely due to embryonic mortality as reflected by abnormal intervals of return to estrus. Two milk progesterone determinations, at 24 and either 40 or 44 days post-insemination ensure maximum reliability for early pregnancy diagnosis. © 1978.
Note:
Related Files :
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More details
DOI :
10.1016/0093-691X(78)90127-9
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20272
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:35
Scientific Publication
Milk progesterone measurement in dairy cows: Correlation with estrus and pregnancy determination
9
Shemesh, M., Dept. of Hormone Research, Kimron Veterinary Institute, Beit Dagan, Israel
Ayalon, N., Dept. of Reproduction, Kimron Veterinary Institute, Beit Dagan, Israel
Shalev, E., Kibbutz Givat Haim Hamuhad, Israel
Nerya, A., Kibbutz Givat Haim Hamuhad, Israel
Schindler, H., Division of Animal Reproduction, Volcani Center, Beit Dagan, Israel
Milguir, F., Dept. of Hormone Research, Kimron Veterinary Institute, Beit Dagan, Israel
Milk progesterone measurement in dairy cows: Correlation with estrus and pregnancy determination
Progesterone levels in fore milk, determined by a highly specific radioimmunoassay, were compared for the assessment of estrus by a veteran herdsman and an experienced inseminator, in cows presented for insemination. In addition, an examination was made of the relative accuracy of using milk progesterone levels for the determination of pregnancy at 24, 40 and 44 days after insemination, as compared with rectal palpation at 45-50 days post-breeding. Fat-free fore milk progesterone levels were similar to jugular plasma levels at 24 days post-insemination and reached roughly 60% of the level of unextracted fore milk at this time. Accuracy of estrus diagnosis by herdsman, inseminator and milk progesterone level was 84%, 93% and 96%, respectively. For pregnancy diagnosis, milk progesterone determination in 85 cows showed 78% accuracy in predicting pregnancy and 100% accuracy in predicting non-pregnancy. At 40 days post-insemination false positives dropped to 10% and at 44 days only 7% of the cows were incorrectly diagnosed as pregnant. The false positives in this study were largely due to embryonic mortality as reflected by abnormal intervals of return to estrus. Two milk progesterone determinations, at 24 and either 40 or 44 days post-insemination ensure maximum reliability for early pregnancy diagnosis. © 1978.
Scientific Publication
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