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Egg Transport in Beef Cattle¹

Washington State University, Pullman

Abstract

Twenty-nine nulliparous Hereford heifers were used to study egg transport. Multiple ovulation in 20 of these heifers was induced by injection of 1,500 to 3,000 IU of PMSG. The oviducts, recovered either by surgery or after slaughter, were measured and divided into eight equal segments. The segment close to the fimbriae was designated as segment 1. Each segment was flushed from both ends with physiological saline. By 30 hr. after ovulation, most of the eggs were located in segments 4 to 6. From 40 to 70 hr. after ovulation the eggs progressed at a much slower rate through segments 4 to 6. In animals with multiple corpora lutea the eggs reached the uterus by 72 hours. In untreated animals the eggs were in segment 6 by 72 hours. Only one-celled eggs were recovered from segment 1. All eggs recovered from the uterus had more than eight cells.

¹ This investigation was supported in part by United States Public Health Service Research Grant HD-00585 from the National Institute of Child Health and Human Development and Banta Research Fund. Scientific Paper No. 3288. College of Agriculture, Washington State University, Pullman. Project No. 1695.

² Department of Animal Sciences.

³ Present address: Department of Molecular Cellular and Developmental Biology, University of Colorado, Boulder.