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פותח על ידי קלירמאש פתרונות בע"מ -
The time of oestrus and ovulation following various synchronisation techniques using progesterone impregnated intravaginal devices
Year:
1982
Source of publication :
Australian Veterinary Journal
Authors :
פולמן, ישעיהו
;
.
Volume :
59
Co-Authors:
CUMMING, I.A.
McPHEE, S.R.
CHAMLEY, W.A.
FOLMAN, Y.
DAVIS, I.F.
Facilitators :
From page:
14
To page:
18
(
Total pages:
5
)
Abstract:
SUMMARY Progesterone releasing intravaginal devices (PRIDs) were used in 4 experiments involving 67 cattle to study the effect of the stage of the oestrous cycle and of oestradiol benzoate (ODB) administration on the time interval from PRID removal to oestrus and/or ovulation. Cows in which PRIDs were inserted on days 2 to 4 of the oestrous cycle for 14 days were subsequently observed by endoscopy to ovulate significantly later than cows given identical treatments on days 13 and 14 of the cycle. The concentration of progesterone was higher in the former group at the time PRIDs were removed and remained at a higher level for 3 days thereafter. The length of the oestrous cycle of untreated heifers was significantly longer than in heifers treated for 12 days with PRIDs only inserted on day 3 of cycle (19.7 v 18.2; p <0.01). Treatment with PRIDs inserted for 12 days together with ODB further shortened the cycle length from 18.2 days to 16.9 days (p <0.01). The intervals from PRID removal to onset of standing oestrus in heifers treated with PRID only and those treated with PRID and ODB were 80h and 45h, respectively (p <0.01); the respective variances were 280 and 4; p <0.01). Plasma progesterone concentration, at PRID removal, was 3 times higher in heifers treated with PRID only than in heifers treated with PRID and ODB (p <0.01) and the interval from PRID removal to the lowest progesterone value following it was 3.8 and 1.2 days for the 2 groups, respectively (p <0.05). The study indicated that the stage of oestrous cycle at PRID insertion is an important factor which influences the interval from withdrawal of PRIDs to ovulation. The results suggest closer synchronisation would follow insertion in the mid‐luteal phase (Day 13 to 14) or use of ODB treatment at the time of insertion of PRIDs. Copyright © 1982, Wiley Blackwell. All rights reserved
Note:
Related Files :
Animal
cattle
drug effect
Estrus Synchronization
Female
ovulation
pregnancy
עוד תגיות
תוכן קשור
More details
DOI :
10.1111/j.1751-0813.1982.tb02703.x
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20245
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:35
Scientific Publication
The time of oestrus and ovulation following various synchronisation techniques using progesterone impregnated intravaginal devices
59
CUMMING, I.A.
McPHEE, S.R.
CHAMLEY, W.A.
FOLMAN, Y.
DAVIS, I.F.
The time of oestrus and ovulation following various synchronisation techniques using progesterone impregnated intravaginal devices
SUMMARY Progesterone releasing intravaginal devices (PRIDs) were used in 4 experiments involving 67 cattle to study the effect of the stage of the oestrous cycle and of oestradiol benzoate (ODB) administration on the time interval from PRID removal to oestrus and/or ovulation. Cows in which PRIDs were inserted on days 2 to 4 of the oestrous cycle for 14 days were subsequently observed by endoscopy to ovulate significantly later than cows given identical treatments on days 13 and 14 of the cycle. The concentration of progesterone was higher in the former group at the time PRIDs were removed and remained at a higher level for 3 days thereafter. The length of the oestrous cycle of untreated heifers was significantly longer than in heifers treated for 12 days with PRIDs only inserted on day 3 of cycle (19.7 v 18.2; p <0.01). Treatment with PRIDs inserted for 12 days together with ODB further shortened the cycle length from 18.2 days to 16.9 days (p <0.01). The intervals from PRID removal to onset of standing oestrus in heifers treated with PRID only and those treated with PRID and ODB were 80h and 45h, respectively (p <0.01); the respective variances were 280 and 4; p <0.01). Plasma progesterone concentration, at PRID removal, was 3 times higher in heifers treated with PRID only than in heifers treated with PRID and ODB (p <0.01) and the interval from PRID removal to the lowest progesterone value following it was 3.8 and 1.2 days for the 2 groups, respectively (p <0.05). The study indicated that the stage of oestrous cycle at PRID insertion is an important factor which influences the interval from withdrawal of PRIDs to ovulation. The results suggest closer synchronisation would follow insertion in the mid‐luteal phase (Day 13 to 14) or use of ODB treatment at the time of insertion of PRIDs. Copyright © 1982, Wiley Blackwell. All rights reserved
Scientific Publication
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