Calva-Rodríguez B, Cortés-Fernández R, Aja-Guardiola S, Ortiz-Chávez FJ, Cevenini-Roveri G

Language: Spanish
References: 22
Page: 129-134
PDF size: 74.62 Kb.

ABSTRACT

Two exploitations of the Mexican State of Tlaxcala (one producer of fighting cattle and the other milk producer), were used to evaluate two types of hormones, the pregnant mare serum gonadotropin (PMSG) and the follicle stimulating hormone (FSH), in relation with the quantity and quality of the embryos obtained by superovulation in the program of embryo transfer. The aim was superovulation; two groups were formed with five fighting females each, administering of the first FSH with descendent doses of 100 I.U. to 37.5 I.U. during four consecutive days, and the second group with administration of PMSG, with an only dose of 2,000 I.U. Using the FSH, 25 transferable embryos were obtained, 20 degenerated or immature and 15 unfertilized oocytes. However, with PMSG, five transferable embryos were obtained, five degenerated or immature and five oocytes. This means that treatment with FSH is more effective than that with PMSG to superovulate fighting females with a probability statistically significant (P ‹ 0.05). The thirty embryos obtained to be transferred were transported to milk exploitation, where the transfer took place. The 30 embryos were transferred to 30 heifers that, which were considered receptors. From the total of the transfers, only five heifers were diagnosed as pregnant (16.6%), coinciding with the embryos obtained from superovulated females with FSH, five (16.6%) repeated the estrus after 21 days of the and ther cycle, another five heifers (16.6%) repeated the estrus after 37 of the cycle, ten (33.3%) only presented a corpus luteum (CL) in the right ovary, and the remaining five (16.6%) in addition to presenting the corpus luteum (CL) in the right ovary presented an uterine infection. This was statistically corroborated with a statistic probability (P ‹ 0.05).

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