Utilización De Un Protocolo Con Proestro Prolongado Con Y Sin Ecg en Vacas Lecheras Holstein en La Amazonía Ecuatoriana

Ortega-Coello, Manuel; López-Parra, Juan Carlos; Marini, Pablo Roberto

doi:10.18548/aspe/0008.03

Cited by 1 publication

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“…The pregnancy percentage was higher in cows with the presence of estrus in both treatments (p≤0.05) (Table 2), similar to that obtained by Ortega et al (2020), where the pregnancy rate with the presence of estrus was 54.3% and without estrus was 44.4% for the J-Synch treatments plus eCG administration. Animals that show estrus before being inseminated result in higher pregnancy rates due to higher pre-ovulatory serum estradiol concentration, larger follicular diameter, and higher ovulatory rate and therefore developed a CL with higher progesterone secretory capacity during the luteal phase (Sá Filho et al, 2011).…”

Section: Discussionsupporting

confidence: 80%

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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Y.²,

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et al. 2023

African Journal of Agriculture and Food Science

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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.

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Section: Discussionsupporting

confidence: 80%