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.
Palomares-Naveda
R A
RA
Universidad del Zulia, Facultad de Ciencias Veterinarias, Unidad de Investigación en Reproducción Animal, Av. Guajira, Ciudad Universitaria, Maracaibo, Venezuela. palomnr@auburn.edu
Portillo-Martinez
G
G
Gutierrez-Añez
J C
JC
De Ondiz-Sanchez
A
A
Goicochea-Llaque
J
J
Gonzalez-Fernandez
R
R
Perea-Ganchou
F
F
Soto-Belloso
E
E
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