Production performance of Holstein cows at four stages of lactation fed four dietary crude protein concentrations

Authors: LETELIER, PAULINA - University Of Wisconsin; Zanton, Geoffrey; WATTIAUX, MICHEL - University Of Wisconsin

Submitted to: Zenodo
Publication Type: Database / Dataset
Publication Acceptance Date: 10/26/2022
Publication Date: 10/26/2022
Citation: Letelier, P., Zanton, G.I., Wattiaux, M.A. 2022. Production performance of Holstein cows at four stages of lactation fed four dietary crude protein concentrations. Zenodo. 105:9581–9596. https://doi.org/10.3168/jds.2022-22146.
DOI: https://doi.org/10.3168/jds.2022-22146

Interpretive Summary:

Technical Abstract: This study evaluated productive performance of cows fed four levels of dietary crude protein across four stages of lactation. After an initial 14-day covariate period, cows were fed treatment diets for 56 days. Dry matter intake and milk yield were measured daily and milk composition and body weight were assessed over two days each week. Data were summarized statistically through categorical mixed model ANOVA and continuous regression analyses. Supplemental materials include: Supplementary Figure S1. Graphical description of the approach used to obtain the dietary CP concentration at the maximum predicted response (panel A) and the 95% confidence interval for the maximal response (panel B).  Supplementary Table S1. Least square means of the interaction between stage of lactation and dietary CP levels for production performance and feed efficiency. Supplementary Table S2. Predicted range in dietary CP for which there was no difference in production responses with increasing DIM.