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Comparison of methods for the synchronization of estrous cycles in dairy cows. 2. Effects of progesterone and parity on conception.
Year:
1990
Source of publication :
Journal of Dairy Science
Authors :
Folman, Yeshayahu
;
.
Herz, Zeev
;
.
Kaim, Moshe
;
.
Volume :
73
Co-Authors:
Folman, Y., Institute of Animal Science, Volcani Center, Dagan, Israel.
Kaim, M., Institute of Animal Science, Volcani Center, Dagan, Israel.
Herz, Z., Institute of Animal Science, Volcani Center, Dagan, Israel.
Rosenberg, M., Institute of Animal Science, Volcani Center, Dagan, Israel.
Facilitators :
From page:
2817
To page:
2825
(
Total pages:
9
)
Abstract:
Three experiments with 571 dairy cows indicated that significantly more primiparous cows given two prostaglandin F2 alpha injections 14 d apart conceived within 30 d of first AI than did cows given two injections 11 d apart (84 vs. 62%). Fewer multiparous cows given two injections 14 d apart and inseminated after estrus conceived than did cows given two injections and a progesterone intravaginal coil inserted 8 d after the first injection (42 vs. 66%). Fewer cows given one injection of prostaglandin and inseminated at estrus conceived than did cows given two injections 14 d apart and a progesterone coil (39 vs. 66%). Conception rates of cows given two prostaglandin injections were positively related to plasma progesterone concentrations 2 and 4 d before the second injection (r = .81 and .86). Cows with progesterone concentrations below 5 ng/ml, 2 d before the second prostaglandin injection, and synchronized by two prostaglandin injections or by two injections and a progesterone coil had conception rates of 36 and 63%, respectively. Cows with progesterone concentrations above 5 ng/ml had a conception rate of 75 and 46% in the two treatments, respectively. Conception after estrus synchronization depends on the method and on the plasma concentrations of progesterone. Progesterone coils may be used before AI to enhance fertility in cows with low progesterone concentrations.
Note:
Related Files :
Animal
Blood
cattle
drug effect
Estrus Synchronization
Female
Fertilization
pregnancy
Show More
Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29075
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:44
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Scientific Publication
Comparison of methods for the synchronization of estrous cycles in dairy cows. 2. Effects of progesterone and parity on conception.
73
Folman, Y., Institute of Animal Science, Volcani Center, Dagan, Israel.
Kaim, M., Institute of Animal Science, Volcani Center, Dagan, Israel.
Herz, Z., Institute of Animal Science, Volcani Center, Dagan, Israel.
Rosenberg, M., Institute of Animal Science, Volcani Center, Dagan, Israel.
Comparison of methods for the synchronization of estrous cycles in dairy cows. 2. Effects of progesterone and parity on conception.
Three experiments with 571 dairy cows indicated that significantly more primiparous cows given two prostaglandin F2 alpha injections 14 d apart conceived within 30 d of first AI than did cows given two injections 11 d apart (84 vs. 62%). Fewer multiparous cows given two injections 14 d apart and inseminated after estrus conceived than did cows given two injections and a progesterone intravaginal coil inserted 8 d after the first injection (42 vs. 66%). Fewer cows given one injection of prostaglandin and inseminated at estrus conceived than did cows given two injections 14 d apart and a progesterone coil (39 vs. 66%). Conception rates of cows given two prostaglandin injections were positively related to plasma progesterone concentrations 2 and 4 d before the second injection (r = .81 and .86). Cows with progesterone concentrations below 5 ng/ml, 2 d before the second prostaglandin injection, and synchronized by two prostaglandin injections or by two injections and a progesterone coil had conception rates of 36 and 63%, respectively. Cows with progesterone concentrations above 5 ng/ml had a conception rate of 75 and 46% in the two treatments, respectively. Conception after estrus synchronization depends on the method and on the plasma concentrations of progesterone. Progesterone coils may be used before AI to enhance fertility in cows with low progesterone concentrations.
Scientific Publication
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