Optimal Dietary Energy and Protein for Gilt Development: Age at Puberty, Ovulation Rate, and Reproductive Tract Traits

  • Julia A. Calderón Díaz (Iowa State University)
  • Jeffrey L. Vallet (United States Department of Agriculture)
  • Clay Lents (United States Department of Agriculture)
  • Danny Nonneman (United States Department of Agriculture)
  • Jeremy Miles (United States Department of Agriculture)
  • Elaine Wright (United States Department of Agriculture)
  • Lea Rempel (United States Department of Agriculture)
  • Robert Cushman (United States Department of Agriculture)
  • Bradley Freking (United States Department of Agriculture)
  • Gary Rohrer (United States Department of Agriculture)
  • Christina Phillips (Murphy Brown, LLC)
  • Ashley DeDecker (Murphy Brown, LLC)
  • George Foxcroft (University of Albert)
  • Kenneth J. Stalder (Iowa State University)


The effect of feeding different lysine and metabolizable energy (ME) levels to 1221 crossbred Large White × Landrace developing gilts housed in groups from 100 d of age until slaughter (approximately 260 d of age) on age at puberty and reproductive tract measurements were evaluated. Gilts were randomly allotted to six corn-soybean diets formulated to provide two standardized ileal digestible lysine levels [100% (high, HL) and 85% (low, LL)] and threemetabolizable energy levels [ME, 90% (low, LME), 100% (medium, MME), 110% (high, HME). Average age at puberty was 193 d of age. There were no effects of the dietary treatments on age at puberty or any of the reproductive tract measurements. Despite significant differences in the lysine:energy ratio in the diets, the expected differences in reproductive traits were not observed. Other factors such as body weight (BW) and days of estrous cycle had a greater effect on the traits recorded than feed provided.

Keywords: Animal Science, ASL R3022

How to Cite:

Calderón Díaz, J. A., Vallet, J. L., Lents, C., Nonneman, D., Miles, J., Wright, E., Rempel, L., Cushman, R., Freking, B., Rohrer, G., Phillips, C., DeDecker, A., Foxcroft, G. & Stalder, K. J., (2015) “Optimal Dietary Energy and Protein for Gilt Development: Age at Puberty, Ovulation Rate, and Reproductive Tract Traits”, Iowa State University Animal Industry Report 12(1). doi: https://doi.org/10.31274/ans_air-180814-1338

Download pdf



Published on
01 Jan 2015
Peer Reviewed