Embryo and cow factors affecting pregnancy per embryo transfer for multiple-service, lactating Holstein recipients

Author:

Estrada-Cortés Eliab12,Ortiz William G1,Chebel Ricardo C13,Jannaman Elizabeth A1,Moss James I1,de Castro Fernanda Cavallari4,Zolini Adriana M1,Staples Charles R1,Hansen Peter J1ORCID

Affiliation:

1. Department of Animal Sciences, University of Florida, Gainesville, FL

2. Campo Experimental Centro Altos de Jalisco, Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Tepatitlán de Morelos, Jalisco, México

3. Department of Large Animal Clinical Sciences, University of Florida, Gainesville, FL

4. Departamento de Medicina Veterinária, Universidade de São Paulo, Pirassununga, São Paulo, Brazil

Abstract

Abstract The objective was to determine whether pregnancy success after embryo transfer (ET) during heat stress in multi-service Holstein cows depends upon characteristics of the embryo or recipient. Female embryos produced in vitro were cultured with either 0.0 (control) or 1.8 mM choline chloride and transferred fresh. Fresh embryos of undetermined breed and frozen Holstein embryos were used when experimental embryos were insufficient. Embryos were transferred 8 d after the last GnRH injection of an ovulation synchronization program. Embryo type [frozen vs. fresh, choline vs. control, unknown breed vs. (control + choline)] and characteristics of recipients (average of 190 d in milk at transfer) were evaluated. Pregnancy per ET was lower for cows receiving frozen embryos (7.0%; 3/43) than for cows receiving fresh embryos (26.7%; 32/120) but there were no differences between various types of fresh embryo. Pregnancy per ET was lower for cows diagnosed with metritis in the early postpartum period (7.1%; 2/28) than for cows without metritis (24.4%; 33/135). In conclusion, the use of frozen/thawed embryos produced in vitro and recipients which had metritis in the early postpartum period reduced the success of ET in multiple-service Holstein cows.

Funder

L.E. “Red” Larson Endowment

CONACyT-México

Publisher

Oxford University Press (OUP)

Subject

General Veterinary,Animal Science and Zoology

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