Abstract 75

Gao,-ZC; Jiang,-YX; Li,-JF; Hou,-SS; Li,-J; Liu,-XM

Institute of Animal Science, Chinese Academy of Agricultural Science, Beijing, China.

Chinese-Journal-of-Animal-Science. 1989, 25: 2, 13-16; 5 ref.

In experiment 1, 5 groups of crossbred pigs weighing about 13 kg on average, were fed on soyabean meal (SBM), glandless cottonseed meal (GLCSM) without free gossypol, or conventional cottonseed meal (GCSM) and 0.04% free gossypol without or with ferrous iron or 0.3% L-lysine hydrochloride for 116 days. In experiment 2, 40 pigs of local breeds (12 kg body weight) assigned to 5 groups were fed on SBM, GCSM (free gossypol 0.06%) and GLCSM (free gossypol 0.01%) without or with 0.3 or 0.15% L-lysine hydrochloride for 150 days. Gossypol levels in liver and muscle were estimated at the end of the experiment. In experiment 1, the daily weight gains were 539, 541 and 530 g, and feed:gain rates were 4.04, 3.96 and 4.11, respectively, in SBM, GLCSM and GCSM + 0.3% L-lysine hydrochloride groups, with no significant difference between groups. Daily gain of pigs given the GCSM diet without synthetic lysine was 372 and 375 g, lower than that in the above 3 groups (P > 0.01). In experiment 2, daily gain of pigs fed on SBM, GLCSM and GCSM + synthetic lysine were 673, 652 and 633 g (P > 0.05), feed:gain ratio 3.69, 3.64 and 3.40. In experiment 1, when diets containing gossypol 76 and 100 mg/kg, were supplemented with ferrous iron at 5 times free gossypol level, the performance of pigs was not improved, suggesting that toxicity of gossypol was 5 mg/kg in liver, but not detectable in muscle.