Effect of the Addition of eCG on day 14 Post-Ftai on the Pregnancy Rate in Cows from The Ecuadorian Amazon-Reference-Cited by-同舟云学术

Effect of the Addition of eCG on day 14 Post-Ftai on the Pregnancy Rate in Cows from The Ecuadorian Amazon

Published:2023-07-21 Issue:2 Volume:6 Page:58-67
ISSN:2689-5331
Container-title:African Journal of Agriculture and Food Science
language:en
Short-container-title:African Journal of Agriculture and Food Science

Author:

E.G. Villacreses,D.Y. Avalos,M.O. Coello,P.R. Marini

Abstract

The effect of the addition of eCG on day 14 after FTAI was evaluated in 200 cows from the Ecuadorian Amazon, with a calf at the foot, of Brown Swiss breeds and their crosses (Bos indicus). Two treatments (T): T1 (J-Synch + eCG day 6) and T2 (J-Synch + eCG day 14 post-FTAI). The pregnancy rate for T1 (57%) and T2 (48%) without showing a significant difference (p≥0.05). The pregnancy percentage was higher (62.5%) in cows in estrus (125/200). Plasma progesterone levels differ between T1 and T2, evaluated on day 14: (7.1 ng/mL); (13.5 ng/mL), respectively, as well as on day 30: T1 (9.6 ng/mL) and T2 (13.7 ng/mL), (p≤0.05). The diameter of CL measured on day 14 (20.8 ± 3.3 mm) and day 30 (28.2 ± 6.2 mm) differed significantly (p≤0.05). Estrous expression is positively associated with an increased pregnancy rate, but improving eCG on day 14 post-FTAI does not improve the pregnancy rate in Ecuadorian Amazon cows.

Publisher

African - British Journals

Subject

Geriatrics and Gerontology

Reference40 articles.

1. Andringa, M., Cavestany, D, and van Eerdenburg, F. (2013). Folículo y ovulación en vacas de leche en pastoreo. SMVU; 49: 4–15.

2. Baruselli, P.S., Marques, M.O., Madureira, E.H., Bó, G.A., Neto, C., Pinto, W. and Grandinetti, R.R. (2000). Superestimulação ovariana de receptoras de embriões bovinos visando o aumento de corpos lúteos, concentração de p4 e taxa de prenhez. Arquivos da Faculdad de Veterinária – UFRGS; 28:218.

3. Baruselli, P., Reis, E., Marques, M., Nasser, L., and Bó, G. (2004).The use of hormonal treatments to improve reproductive performance of anestrous beef cattle in tropical climates. Animal Reproduction Science; 82 (83), 479–486.

4. Bó, G. A., Cutaia, L. E., Souza, A. H. and Baruselli, P. S. (2007). Systematic Reproductive Management in Dairy Herds. Dairy Cattle Conference, Christchurch, New Zealand; 155 -168.

5. Bó, G., Cutaia, L., and Bartolomé, J. (2011). Uso de la eCG asociada a los programas de reproducción en vacas lecheras. IX Simposio Internacional de Reproducción Animal; I: 122–148.