Herd level factors associated with pregnancy success and distribution in beef cow-calf herds

Fountain, Tara; Larson, Robert L.; White, Brad J.

doi:10.58292/ct.v13.9361

Cited by 1 publication

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cow body weight at pasture turnout, pasture removal, gain on pasture, and pregnancy rates to AI and overall ( Table 2 ) and distribution of subsequent calving ( Table 3 ) were not affected by VTM access on pasture ( P ≥ 0.22). Overall, performance and pregnancy success were acceptable for cows in both treatment groups compared with benchmarking data and previous research reports ( Dahlen and Stoltenow, 2015 ; Larson and White, 2016 ; Fountain et al, 2021 ). Additionally, though BW gain during grazing was not affected ( P = 0.63), old cows were heavier ( P < 0.0001) at pasture turnout and pasture removal, and calved later in the subsequent calving season ( P = 0.007) compared with cows in the young block (data not shown).…”

Section: Resultssupporting

confidence: 65%

Effects of feeding a vitamin and mineral supplement to cow-calf pairs grazing native range

Hurlbert

Baumgaertner

McCarthy

et al. 2023

Translational Animal Science

View full text Add to dashboard Cite

Our objectives were to evaluate the impacts of providing vitamin and mineral (VTM) supplements to cow-calf pairs during the summer grazing period on cow and calf performance and liver concentrations of minerals. During a two-year period, 727 crossbred cows and their calves (initial cow BW = 601.7 ± 48.1 kg; calf BW = 87.8 ± 5.0 kg; n = 381 in year 1, n = 346 in year 2) from the Central Grasslands Research Extension Center (Streeter, N.D.) were blocked by parity (young [parity 1 to 3], and old [parity 4+]) and randomly assigned to pastures at the beginning of the grazing season (16 in year 1 and 14 in year 2). Pastures were assigned to receive a free-choice VTM supplement (SUPP) or no VTM supplement (CON) from pasture turn out to pasture removal (158 and 156 days in year 1 and 2, respectively). Consecutive day weights were taken from cows and calves at pasture turn out and removal, and liver biopsies were collected from a subset of cows at both timepoints and from calves at weaning. Cows were bred via AI 37 to 41 d after pasture turn out and by natural service cleanup bulls for a 70 to 80 d breeding season. Calving and weaning data were collected from the calf conceived and gestated during treatments. Data were analyzed for the effect of VTM treatment (SUPP vs. CON), block of parity, and their interaction using the GLM procedure of SAS with pasture as the experimental unit. Year was considered a random effect in the final analysis. Cow pregnancy success was evaluated using the GLIMMIX procedure in SAS with model terms of VTM treatment, parity, and their interaction with year as a random effect. In year 2, cows in differing days postpartum (DPP) groups at pasture turn out (66.1, 48.8, and 34.5 ± 1.04 DPP for EARLY, MID, and LATE groups, respectively) were selected for liver biopsies with cow as the experimental unit. Cow and calf BW and BW change were not impacted (P ≥ 0.20) by VTM access. Pregnancy rate to AI, overall pregnancy rate, gestating calf birth BW and calving distribution were not affected (P ≥ 0.11) by treatment. Liver concentrations of Se, Cu and Co were greater (P ≤ 0.002) at pasture removal and weaning for cows and suckling calves that had access to VTM. Cows considered EARLY calving had greater (P = 0.05) concentrations of liver Se compared with LATE calving cows. Although VTM supplementation enhanced concentrations of key minerals in the liver of cow-calf pairs, reproductive and growth performance was not affected.

show abstract

Section: Resultssupporting

confidence: 65%