Comparison between two progesterone sources and two oestradiol formulations in a Heatsynch protocol for postpartum cycling dairy cows in pasture
Journal of Veterinary Science
;
: 161-166, 2013.
Article
in English
| WPRIM
| ID: wpr-104703
ABSTRACT
To compare an injectable progesterone (MAD-4) with an intravaginal device (IPD), and natural O17 with synthetic oestradiol (OB) in a synchronisation protocol, 51 cows were divided into four groups. Each group was treated with one of the two sources of progesterone and one of the two oestradiol formulations. Oestrus behaviour, follicle diameter, and pregnancy rates were evaluated. Oestrus behaviour (p = 0.902), numbers of cows in oestrus (p = 0.917), follicle diameter (p = 0.416), and pregnancy rates (p = 0.873) were similar among the four groups. More cows in the group treated with the IPD and OB scored > 200 oestrus behaviour points compared to the other groups (p = 0.038). A longer interval between the end of treatment and oestrus was observed among cows treated with MAD-4 than cows given the IPD (p = 0.030), but no differences were found between animals receiving the two oestradiol formulations (OB and O17). While the use of MAD-4 requires further testing, similar responses to natural oestradiol observed in the present study could allow the use of this formulation in reproductive protocols because it is not associated with the potential human health risks of OB.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Progesterone
/
Reproduction
/
Administration, Intravaginal
/
Estrus
/
Pregnancy Rate
/
Postpartum Period
/
Estradiol
/
Estrus Synchronization
/
Ovarian Follicle
/
Injections, Subcutaneous
Type of study:
Practice guideline
Limits:
Animals
/
Pregnancy
Language:
English
Journal:
Journal of Veterinary Science
Year:
2013
Type:
Article
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