Mississippi State University
Morrison, Jesse I.
Karisch, Brandi B.
Baldwin, Brian S.
Parish, Jane A,
Date of Degree
Original embargo terms
Visible to MSU Only 3 Years
Graduate Thesis - Campus Access Only
Master of Science
College of Agriculture and Life Sciences
Department of Plant and Soil Sciences
Annual ryegrass (Lolium multiflorum Lam.) can be divided into two cytotypes: diploid (2n = 2x = 14) or tetraploid (2n = 4x = 28). Transforming annual ryegrass from diploid to tetraploid often results in increased seedling vigor, more robust growth and, thus, supposedly greater yield. There has been conflicting research that suggests no difference in yield between diploid and tetraploid cultivars, but livestock producers’ question whether benefits exist to utilizing tetraploid cultivars for grazing cattle. This study sought to determine if annual ryegrass cytotype affected cattle average daily gain. Although there were no differences in average daily gain between cytotypes, there were differences among cultivars. In 2017, Jumbo (4x) produced the greatest weight gain, while in 2018, Tam-90 (2x) generated the greatest gain. This study suggests that there are no advantages attributed to average daily gain by utilizing tetraploid, as opposed to diploid cultivars.
Montgomery, Sarah Marie, "Performance evaluation of cattle grazing diploid and tetraploid annual ryegrass." (2019). Theses and Dissertations. 5062.