Factors affecting the success of resynchronization protocols with or without progesterone supplementation in dairy cows
Journal of Veterinary Science
;
: 121-126, 2015.
Article
Dans Anglais
| WPRIM
| ID: wpr-74486
ABSTRACT
The objective of this study was to investigate factors that influence the success of resynchronization protocols for bovines with and without progesterone supplementation. Cow synchronized and not found pregnant were randomly assigned to two resynchronization protocols ovsynch without progesterone (P4) supplementation (n = 66) or with exogenous P4 administered from Days 0 to 7 (n = 67). Progesterone levels were measured on Days 0 and 7 of these protocols as well as 4 and 5 days post-insemination. Progesterone supplementation raised the P4 levels on Day 7 (p 3.5 had increased P/AI values while cows with BCS < 2.75 had decreased P/AI rates after P4 supplementation. Primiparous cows had higher P4 values on Day 7 than pluriparous animals (p = 0.04) and tended to have higher RRs (p = 0.06). Results of this study indicate that progesterone supplementation in resynchronization protocols has minimal effects on outcomes. Parity had an effect on the levels of circulating progesterone at initiation of the protocol, which in turn influenced the RR.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Ovulation
/
Progestérone
/
Trométhamine
/
Bovins
/
Insémination artificielle
/
Dinoprost
/
Hormone de libération des gonadotrophines
/
Synchronisation de l'oestrus
/
Fécondostimulants
Limites du sujet:
Animaux
/
Grossesse
langue:
Anglais
Texte intégral:
Journal of Veterinary Science
Année:
2015
Type:
Article
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