The lysine need of the pig follows that of lean accretion. Simply stated, the greater the lean accretion, the greater the lysine requirement. With protein accretion rates of 80 to 135 grams per day, the daily lysine requirements ranged from 12 to 18 grams per day. Based upon this analysis, Farm 2 was over-feeding lysine, especially in the late finishing phase. As expected, the pigs on Farm 1 have a greater lysine to energy requirement.
Gilts have a greater lysine to energy requirement than barrows.
The standard errors of growth curves are shown in Figure 7. The standard errors of the growth rates are larger at live weights under 100 lb and above 225 lb. This increase in the live weight curves is important, as the live weight growth curves are used, in part, to predict all subsequent daily body component growth curves and daily nutrient requirements. The standard errors of the daily protein and lipid accretion rates are shown in Figures 8 and 9. The standard errors for protein accretion are greater at the lower and upper live weights.