Location: Livestock Bio-SystemsTitle: Optimal dietary energy and protein for gilt development: Age at puberty, ovulation rate, and reproductive tract traits
|CALDERON DIAZ, JULIA - Iowa State University|
|Nonneman, Danny - Dan|
|Cushman, Robert - Bob|
|Freking, Bradley - Brad|
|PHILLIPS, CHRISTINA - Murphy Brown Llc|
|DEDECKER, ASHLEY - Murphy Brown Llc|
|FOXCROFT, GEORGE - University Of Alberta|
|STALDER, KENNETH - Iowa State University|
Submitted to: Iowa State University Animal Industry Report
Publication Type: Research Technical Update
Publication Acceptance Date: 2/1/2015
Publication Date: 3/2/2015
Citation: Calderon Diaz, J.A., Vallet, J.L., Lents, C.A., Nonneman, D.J., Miles, J.R., Wright-Johnson, E.C., Rempel, L.A., Cushman, R.A., Freking, B.A., Rohrer, G.A., 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. AS 661(ASL R3022). Available: https://lib.dr.iastate.edu/asn_air/vol661/iss1/85.
Technical Abstract: 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.