Comparison of reproductive and early growth performance of an F1 USDA Prime yield grade one carcass clone sire and an industry-leading purebred sire in the Beef x Dairy production system




Richardson, Katylyn Jo

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The objectives of this research were to determine if an F1 USDA Prime, yield grade 1 sire produced from the WTAMU PrimeOne Project (AxG1) was a competitive sire for producing dairy composites when compared to a purebred Angus sire (Foundation), and to evaluate any subsequent reproductive impact of sire on dam. Dairy cows (n = 1,930) were artificially inseminated resulting in 764 pregnancies with 567 births and 539 live calves. Data was collected at a large commercial dairy and analyzed using SAS 9.4 with sire as fixed effect; lactation, breeding technician and services per conception were random effects. Individual animal was experimental unit (n = 539). Conception rates were 39% for AxG1 and 30% for Foundation (P ≤ 0.01). Average gestation length (GL) was 284-d and 280-d for AxG1 and Foundation, respectively (P ≤ 0.01). Calves by Foundation reported lower average birth weight (BW) than those by AxG1 (P ≤ 0.01) with no difference in calving ease score (CE) (P = 0.24). Calves sired by Foundation were lighter than those sired by AxG1 at 60-d (P ≤ 0.01) but not 120-d (P = 0.97). Calves by Foundation also reported higher average daily gains (ADG) at 60-d than calves by AxG1 (0.61 and 0.58 kg; P ≤ 0.01), and ADG tended to differ by sire from 0-120-d (0.70 and 0.67 kg; P = 0.09). Sire had no effect on morbidity (P = 0.25) or mortality (P = 0.15). Post-partum interval (PPI), time from first estrus to conception, and number of services to conception were not different between sires (P = 0.35; P = 0.32; P = 0.37). Data from this trial indicates the cloned progeny sire increased conception rates, but the purebred Angus sire was more favorable for GL, BW and progeny growth performance. Neither sire negatively impacted subsequent reproductive performance of the dam.


This project was based on observational and experimental data collected by the researchers and employees of the commercial dairy where the study was conducted.


2023 Faculty and Student Research Poster Session and Research Fair, West Texas A&M University, Department of Agricultural Sciences, Poster, PrimeOne Project, Angus, Dairy cows


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