Diet selection in pigs: dietary choices made by growing pigs following a period of underfeeding with protein

摘要: Forty pigs (half each of females and entire males) were used in an ad libitum feeding experiment from weaning to 33 kg live weight (LW). In period 1 16 LW, the had either food L (134 g crude protein (CP) per kg) or H (278 CP alone. The aim was delay growth on create two groups with different body compositions. At eight killed their empty bodies chemically analysed. given 1·06 (s.e. 0·08) more lipid a lower protein: ash ratio than H; rates, 9 386 (L) 591 (H) (s.e.d. 17)g/day. Both aims thus achieved.In 2 previously (no. = 16) 1, alone 4), 4) choice between 8) LW when choice-fed objective test idea that deficient CP, foods, one high low, content will select diet composition allows them correct effects previous mis-feeding. grew slowly, ate day, those alone, no effect 1. Of 2, faster, efficient, H.The contents (g food) diets selected by significantly affected both sex (228 for males v. 181 females; s.e.d. 15) (233 175 significant interaction these factors. faster (1039 780 70) g/day) higher daily intake (1420 1319 71) efficient (0·736 0·595 0·034) gain H. weights similar treatments (L 0·40 0·54) H); 1·79 males.It is concluded that, where are foods low contents, they such mis-feeding corrected. Giving appropriate pair suitable needs.