Determination of protein level and lysine supplementation

(1)

Determination of protein level and lysine supplementation

of

a

maize/soyabean diet for bacon pigs

J.

^CASTAING M. LEUILLET :J.;.;<i<.i«tio><

génhale

^desProducteurs de .1Iaïs,

l, plac,,

^S^{. de}

Lestap l s,

64000 Pau

institut

Technique

des Céréales et des

1,-oti;,;,agi>s,

8, ^alh’n/t(.du Président Wilson,

75116 Paris

This

study

^was^made^toexamine the consequences ot restricted

protein feeding

^constant

supply during

^both

growing

^and

finishing periods

^and^{in order}^to

limit, by lysine supplementation,

the

slight lowering

^of

performances

recorded in

during

^the

growing period.

The results obtained show the

following

^{facts :}

Conrparisnu of dietary !;Y)/r/77

^levels

(1 7 ,

1,!; and 73 p.

/00)

Diets

containing

17 and t p. ¹⁰⁰crude

protein

gave the ^same

performances

for all harante- ters studied.

The diets

containing

t; p. ¹⁰⁰crude

protein

^did^notdiffer from the others for the overall

growing-finishing period,

^{but the}

performances

recorded between ₂₉and 60

kg

^werelower, nota-

11y in

the females. This was

partially compensated

^for

during

^the

finishing period

where the die-

tary lysine

^content^was0.6S p. ¹⁰⁰ and the

Ivsinejdigestib1l ’

energy ratio 1.92.

C nvryarisoia <)/ lysine suppll’lncntation

^levels.

For the whole

experimcntal period,

^the^three

lysine supplemented

^diets

(t 3

p. ^toocrude

protein

ⁱⁿ^{the basal}

diet)

^did^not^showany

significant

difference either between each others or

in

comparison

^with^the^first^three^ones

( y ,

y and t; p. ^toocrude

protein).

The

prewiously

recorded lower

performances during growth (CnsTnrnc

ândÎ,ÊuiLi-1 .>.,

i y 7 _5)

with a y p. ^coocrude

protein

^diet

supplemented

^with

lysine

^as

compared

^to^a^r⁸p. ^toocrude

protein

^diet^were^notobserved in the

present

trial. The difference between the

weights

^{of the}

piglets

^{at the}

beginning

^of^the

experiment might explain

this result :

ligliter

^animals^with

higher requirements

^for

protein

^{would be}

penalized.

During

^the

finishing period

^weobserved that

performances

^werereduced with

increasing

lysine

^levels,ⁱⁿ

particular

in castrated males. This would indicate the limits for use of this amino acide in low crude

protein

^diets.

Determination of protein level and lysine supplementation