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CHROMOSOME ABNORMALITIES IN EARLY EMBRYOS OF THE PIG

This report presents the results of chromosome analysis of blastocysts collected and processed as previously described (McFeely, 1966) from seven gilts selected at random from the swine herd at the University of Pennsylvania. No records of parentage of the gilts were available, but as they consisted of various breeds and cross breeds from a variety of sources, it was assumed that they were not closely related. Two unrelated, pure bred, Yorkshire boars were used as sires. Chromosome analysis of peripheral blood leucocytes from all of the pigs did

not reveal any abnormalities, nor were any physical defects observed in the animals. No immunization or drugs were administered at any time during the experiment, and no disease of consequence was noted.

The recovery rate of blastocysts was 98% based on corpora lutea counts as indicative of