Treatment with an intravaginal progestagen and estradiol to prevent prolonged anestrus in crossbred zebu cows under tropical conditions.
To study the effectiveness of a treatment with an intravaginal progestagen in combination with estradiol-17beta (E-17beta) on estrus induction, prevention of prolonged anestrus and fertility in noncycling crossbred zebu cows, a trial was conducted in a farm in Zulia state, Venezuela. Fifty noncycling suckled crossbred cows (B. taurus x B. indicus) with 60 dpp were randomly allotted to one of the following treatments: MAP+E-17beta (n=22), intravaginal device (250 mg of MAP) during 7 days + 50 mg of MAP and 5 mg of E-17beta im (day 0) and 1.5 mg of E-17beta im (day 8) (Pregnaheat-E; VIATECA-Venezuela); CG (n=28), control group without hormonal treatment. The MAP+E-17beta group showed higher (P<0.05) estrus and synchronization rates (59.1 and 36.4 %) than CG (25.0 and 3.5 %). Cows receiving MAP had higher (P<0.05) overall pregnancy rate than CG (45.5 and 17.8 %, respectively). A decreased (P<0.05) anestrus rate was observed in MAP+E-17beta (31.8%) compared to CG (57.1%). Calving-conception interval was shorter (P<0.05) in MAP+E-17beta (132.5+/-16.8 days) than in CG (178.9+/-14.7 days). In conclusion, treatment with MAP+E-17beta at 60 days postpartum was effective to induce estrus, prevent prolonged anestrus, and reduce the calving-conception interval, improving reproductive performance in dual purpose crossbred Zebu cows.
Universidad del Zulia, Facultad de Ciencias Veterinarias, Unidad de Investigación en Reproducción Animal, Av. Guajira, Ciudad Universitaria, Maracaibo, Venezuela. palomnr@auburn.edu
R A
RA
Palomares-Naveda
G
G
Portillo-Martinez
J C
JC
Gutierrez-Añez
A
A
De Ondiz-Sanchez
J
J
Goicochea-Llaque
R
R
Gonzalez-Fernandez
F
F
Perea-Ganchou
E
E
Soto-Belloso
D000282:Administration, Intravaginal; D000780:Anestrus / Q000187:drug effects*; D000818:Animals; D002417:Cattle / Q000502:physiology*; D003612:Dairying; D004958:Estradiol / Q000008:administration & dosage*; D004973:Estrus Synchronization / Q000502:physiology; D005260:Female; D007315:Insemination, Artificial / Q000662:veterinary; D008297:Male; D017258:Medroxyprogesterone Acetate / Q000008:administration & dosage*; D011247:Pregnancy; D045167:Progesterone Congeners / Q000008:administration & dosage*; D011897:Random Allocation; D014329:Tropical Climate
D045167:Progesterone Congeners; D004958:Estradiol; D017258:Medroxyprogesterone Acetate