ABSTRACT: Two studies were conducte

ABSTRACT: Two studies were conducted to assessthe effects of dietary protein and Lys reduction ongrowth performance, carcass quality, N excretion, andplasma N profile in growing–finishing pigs from 35 to180 kg. The growing trial was conducted with 72 giltsand 72 barrows with 6 pens per treatment and 6 giltsor 6 barrows per pen. Four diets with the same DE andNE were compared: 1) control diet, 2) diet with proteincontent reduced by 3% units compared with thecontrol diet and supplemented with Lys HCl to matchthe requirements according to the 2012 NRC (FLys),3) diet similar to FLys for protein level but supplementedwith only 50% of the Lys HCl provided withFLys (–50% FLys), and 4) diet similar to FLys and–50% Flys for protein level with microencapsulatedLys added to supply 20% of the Lys provided by FLys(–80% MLys). Pigs fed the FLys diet performed in asimilar manner and showed similar carcass characteristicsto the control pigs. Pigs fed the –50% FLys diethad the lightest BW (P < 0.01) as well as the lightestcarcass (P = 0.02) and trimmed thigh (P = 0.04)weights. Pigs fed the –80% MLys diet showed growthperformance and carcass characteristics similar to thecontrol pigs. The N balance study was conducted with

ABSTRACT: Two studies were conducted to assess
the effects of dietary protein and Lys reduction on
growth performance, carcass quality, N excretion, and
plasma N profile in growing–finishing pigs from 35 to
180 kg. The growing trial was conducted with 72 gilts
and 72 barrows with 6 pens per treatment and 6 gilts
or 6 barrows per pen. Four diets with the same DE and
NE were compared: 1) control diet, 2) diet with protein
content reduced by 3% units compared with the
control diet and supplemented with Lys HCl to match
the requirements according to the 2012 NRC (FLys),
3) diet similar to FLys for protein level but supplemented
with only 50% of the Lys HCl provided with
FLys (–50% FLys), and 4) diet similar to FLys and
–50% Flys for protein level with microencapsulated
Lys added to supply 20% of the Lys provided by FLys
(–80% MLys). Pigs fed the FLys diet performed in a
similar manner and showed similar carcass characteristics
to the control pigs. Pigs fed the –50% FLys diet
had the lightest BW (P < 0.01) as well as the lightest
carcass (P = 0.02) and trimmed thigh (P = 0.04)
weights. Pigs fed the –80% MLys diet showed growth
performance and carcass characteristics similar to the
control pigs. The N balance study was conducted with

ABSTRACT: Two studies were conducted to assess
the effects of dietary protein and Lys reduction on
growth, performance. Carcass quality N excretion, and
plasma, N profile in growing - finishing pigs from 35 to
180 kg. The growing trial was conducted. With 72 gilts
and 72 barrows with 6 pens per treatment and 6 gilts
or 6 barrows per pen. Four diets with the same DE and
NE. Were compared:1), control diet 2) diet with protein
content reduced by 3% units compared with the
control diet and supplemented with. Lys HCl to match
the requirements according to the 2012 NRC (FLys),
3) diet similar to FLys for protein level but supplemented
with. Only 50% of the Lys HCl provided with
(- FLys 50% FLys), and 4) diet similar to FLys and
- 50% Flys for protein level with. Microencapsulated
.Lys added to supply 20% of the Lys provided by FLys
(- 80% MLys). Pigs fed the FLys diet performed in a
similar manner and. Showed similar carcass characteristics
to the control pigs. Pigs fed the - 50% FLys diet
had the lightest BW (P < 0.01 as.) Well as the lightest
carcass (P = 0.02) and trimmed thigh (P = 0.04)
weights. Pigs fed the - 80% MLys diet showed growth
.Performance and carcass characteristics similar to the
control pigs. The N balance study was conducted with.