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LYSINE,

METHIONINE AND

CYSTINE REQUIREMENTS

OF SEMI-HEAVY LAYERS

M. PICARD

S. BERTRAND

J.

SALVERT

Service

zootechnique,

A. E.

C.,

03600

Commentry

Two different strains of commercial

semi-heavy layers

received natural diets

containing

2700 kcal metabolisable energy per

kg.

The

following

levels of essential amino acids were obtained

by adding

DL-méthionine

or/and L-lysine :

These

experimental

feeds were

given

ad libitum to the birds

kept

in individual cages

during

40

weeks’

laying.

Individual controls of

production

and feed

consumption

were carried out every four weeks. For each level of

supplementation,

there were

4 8 replicates

for one strain and 60for the other of a

single

hen.

The results were considered over the total

laying period.

- A

significant

effect has been noted between the two lower levels of methionine

( 5

p. 100 difference in feed

conversion).

- The

daily

methionine

requirement

of

layers

has been estimated to be

ranged

between

3

6

0

and 390 mg.

- No difference has been recorded in the

performances

of birds

receiving : 0

. 5

8

p. 100 or

o.6 4

p. 100of total

sulphur

amino

acids,

0.59 p. 100 or 0.70 p. 100of

lysine.

This trial confirms our

previous

works. A

semi-heavy layer

is

largely

satisfied

by

a feed

containing :

27oo kcal metabolisable

energy/kg,

0.30 p. 100

methionine,

0

.

54 p. 100total

sulphur

amino acids

(T.

S. A.

A.),

0.59 p. 100

lysine.

But it is

quite

necessary to control not

only

the T. S. A. A. content of commercial feeds but also their methionine content.

Références

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