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Relationship between Gestation Length of Artificially Inseminated Ewes and Number, Weight and Sex of Lambs Born¹

University of Kentucky, Lexington 40506

Abstract

Data collected during a 19-year period were utilized to determine the relationship between gestation length of artificially inseminated ewes and number, weight and sex of lambs born to these ewes. Data were analyzed separately for ewes giving birth to one lamb and those giving birth to two lambs. Ewes giving birth to two lambs had gestation lengths 0.1 days shorter than ewes giving birth to one lamb, but the difference was nonsignificant. Sex of lamb was not a significant source of variation influencing gestation length of ewes giving birth to one or two lambs. Hence, there is no suggestion of a significant differential hormonal effect on gestation length in the ewes because of sex of offspring. Regression of gestation length on total birth weight of lambs born was 0.35±0.07 (P<.01) and 0.14±0.06 (P<.01) for ewes giving birth to one and two lambs, respectively. Thus, within each sex of lamb, ewes with heavier lambs at birth had longer gestation lengths.

¹ Published with approval of the Director of the Kentucky Agricultural Experiment Station as Journal Article 71-5-82.