Title | Factors affecting dystocia in range beef heifers |
Publication Type | Thesis |
Year of Publication | 1975 |
Authors | Cadle, Jr. JMark |
Number of Pages | 68 |
Date Published | 1975 |
University | New Mexico State University |
City | Las Cruces, New Mexico |
Thesis Type | M.S. Thesispp |
Call Number | 00473 |
Keywords | cattle breeding, dystocia, cattle reproduction, dystocia, disease,dystocia, dissertation, dissertations, dystocia, reproduction, also SEE <CATTLE REPRODUCTION>, theses, thesis |
Abstract | Fifty-five primiparous heifers belonging to the Brangus, Hereford, Brangus X Hereford and Hereford X Brangus breeds were used to study factors affecting dystocia. Characteristics of the dam including height, weight, measurements between the hook bones, hook and pin bones, pin bones, horizontal and vertical pelvic dimensions and pelvic area were measured in October, December and February. Calf sex and individual calf measurements including head width, shoulder width and birth weight were determined within 24 hours after birth. Correlations for the three periods of measurement suggested less dystocia for progressively larger framed and heavier dams. Dam body weight had significant negative correlations (P<.05 to="" dystocia="" for="" the="" three="" times="" of="" measurement.="" dam="" height="" was="" found="" have="" significant="" negative="" correlations="" and="" december="" february.="" only="" when="" taken="" in="" did="" hook-pin="" measurement="" a="" correlation="" february="" hook-hook="" dystocia.="" pelvic="" area="" significantly="" correlated="" obtained="" or="" stepwise="" regression="" each="" months="" indicated="" more="" reliable="" prediction="" closer="" term="" variables="" are="" considered.="" thirty-eight="" percent="" variation="" score="" october="" respectively="" accounted="" equations.=""> |