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1999, Number 1

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Vet Mex 1999; 30 (1)

Plasma progesterone concentrations and embryo yield in superovulated cows under tropical conditions in the state of Yucatan in Mexico

Ake LJR, Alfaro GME, Aguayo AAM, Holy L

Language: English/Spanish
References: 32
Page: 19-23
PDF size: 42.43 Kb.


ABSTRACT

This study was carried out in three ranches in the state of Yucatan, Mexico. The objective was to study the relationship between plasma progesterone (P4) concentration at the beginning of the superovulatory treatment, at estrus and at the embryo collection day studying both the ovary response and embryo yield. Eleven days after oestrus, 30 cows were superovulated with the follicle stimulating hormone (FSH-P) and embryos were non-surgically collected 7 days after insemination. Cows with a plasma P4 concentration above 3 ng/ml at the beginning of the superovulation presented a major number of corpora lutea (CL: 12.4 vs. 10.2; P› 0.05), total ova and embryos (TOE: 9.3 vs. 4.7; P‹0.01) and transferable embryos (TE: 6.6 vs. 3.0; P‹0.01) than animals with ≤ 3 ng/ml. All cows showed estrus after the PGF2a injections. Animals a with a P4 concentration ≤ 1 ng/ml at estrus produced more TOE (6.9 vs. 3.0) and TE (4.6 vs. 0.0), than the ones with a P4 concentration › 1 ng/ml. Animals with › 11 ng/ml of the P4 concentration at day of embryo collection presented a higher number of CL (15.5 vs. 10.5; P›0.05), TOE (10.0 vs. 5.9; P‹0.05) and TE (7.9 vs. 4.6; P‹0.05) than cows with a lower plasma P4 (≤11 ng/ml) concentration. It was concluded that cows with a plasma P4 concentration above 3 ng/ml at the beginning of the superovulation, ≤ 1 ng/ml at estrus and with › 11 ng/ml on the day of embryo collection, had a better response after the superovulatory treatment and produced more embryos. Under tropical conditions, a plasma P4 concentration prior to the beginning of the superovulatory treatment can be used as a basis to select donor cows with a greater potential response.


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