132 Weight and Reproduction Response to a Peanut Skins Plus Corn Supplement Offered to Heifers Grazing Spring Wheat Pasture During Artificial Insemination Breeding

Abstract The objective was to assess heifer weight and reproduction response a peanut skins plus corn supplement during spring wheat grazing. In of 2021 2022, 10 8 pastures (1.62 ha/pasture) fall overseeded were randomly assigned (SUP) or control (CONT) constrained the same number replications per treatment. Pastures stocked with 6 heifers/pasture each year. initial goal use as single ingredient; however, testing palatability in year 1, before grazing, demonstrated need create mixed for improved acceptance. Over 5 weeks from initiation grazing breeding, heifers transitioned 33:67 50:50 skins:corn mix. Supplement offered at 0.5% BW, as-fed, start early March. An additional 2.4% 8.3% inclusion dried molasses incorporated further enhance acceptance 1 2, respectively. Estrus synchronization (ES) began March 31 April Data analyzed across considered random effect pasture experimental unit. Initial 12 ± 5.8kg greater (P = 0.05) SUP. Weight ES tended 0.11) be 9.4 5.55kg Reproduction tract score similar 0.55), averaging 4.2 0.13, 0.33) age (405 4.1 days) time insemination. Average daily gain until removal natural service breeding did not differ between treatments 0.92) averaged 1.0 0.21 kg. Body condition 0.43) 5.7 0.7. heavier BW SUP sustained through 0.05). Ultrasound determined pregnancies 66.7 50.0 6.6% CONT, respectively, an odds ratio 2.1 0.79 0.08) 30 days after Overall pregnancy rates following 88.9 79.6 4.88% respectively 2.1±1.12 (P=0.19). High dietary protein has been associated reduced reproductive performance. Using hypothesized improve on high diet due possible tannins utilization altering rumen degradable organic matter ratio. While fixed artificial insemination CONT would poor, there tendency secure more among age, score, body condition.