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

Elgi García Villacreses; Darwin Yánez Avalos; Manuel Ortega Coello; Pablo Roberto Marini

doi:10.52589/AJAFS-MUS6EKQP

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

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

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African Journal of Agriculture and Food Science

Vol. 6Issue 22023pp. 58–67Published 21 July 2023

DOI 10.52589/AJAFS-MUS6EKQP

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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.

Keywords:eCG Estrus J-Synch Amazon.

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