Swine

Effect of Gilt Developer Diets Differing in Standard Ileal Digestive Lysine Concentrations on Age and Growth Performance at First Heat-No-Service and Mating

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Abstract

An experiment was conducted to determine the optimum dietary lysine concentration for reproductive performance and optimum growth rate at first heat-no-service (HNS) and mating of replacement gilts. Three grower and finisher diets were formulated to contain low lysine (0.68 and 0.52% standard ileal digestible (SID) lysine), medium lysine (0.79 and 0.60% SID lysine), and high lysine (0.90 and 0.68 % SID lysine) at data recording day (142, 160 and 200 d of age). Trial gilts (n=2,541) were moved to breeding farms for age and performance measurement (age, body weight, caliper, flank-to-flank, backfat, loin depth, and fat-free-lean). Fixed effects of dietary lysine treatment, farm, week of birth, and covariate 100 d were included in the model and were analyzed using Proc Mixed. Dietary lysine treatment had significant influence on growth performance at natural HNS and HNS induced with PG600 (P<0.05). Gilts fed the high dietary lysine treatment had greatest impact on growth traits (P<0.05) for both gilts having natural HNS (135.3±0.8 kg) and gilts induced with PG600 (140.6±1.0 kg) when compared to gilts fed the other treatments and expressing estrus in the same manner. Moreover, the high dietary lysine level had the desired effect on age (227.7±1.0 d) and growth performance (140.7±0.8 kg) at first mating. The results indicated that high lysine diet may useful to impact growth traits at first HNS and mating when fed to developing gilts from 100 to 200 d of age.

How to Cite:

Stalder, K. J., Vallet, J. L., Supakorn, C., Lents, C., Prince, T. J., Phillips, C. E., Boyd, R. & DeDecker, A. E., (2019) “Effect of Gilt Developer Diets Differing in Standard Ileal Digestive Lysine Concentrations on Age and Growth Performance at First Heat-No-Service and Mating”, Iowa State University Animal Industry Report 16(1).