飼糧中離胺酸或色胺酸之缺乏對保育豬肌肉蛋白質更新之影響

The aim of this study is to investigate effects of
dietary lysine deficiency on protein accretion
rates of porcine muscles. Pigs at 12 kg
received a diet containing 61.4% of lysine
requirement were in force-feeding by gastric
tubes for 18 days. Results showed that the
deficient pigs were with much lower lysine
(p<0.01) but significantly higher methionine and
isoleucine concentrations in plasma in
comparison with a control group and lysine
deficiency caused significantly lighter body
weights and slower growth rates. Protein
masses deposited for muscles masseter,
longissimus dorsi, adductor or biceps femoris in
the deficient group were only 62%, 64%, 63% or
58%, respectively, compared to that of the pigs
fed adequately. Protein accretion rates of the
afore-mentioned muscles in the control group
were higher, significantly different from the
deficient pigs; nevertheless, there was no
significant difference in amino acid composition
of muscles masseter or longissimus dorsi
between two groups, and it implied that the
decreases in muscle protein deposition were due
to reductions in accretion between individual
muscle proteins, proportionately, but not because
of some muscle proteins specifically sensitive to
deficiency of lysine.