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Effects of reducing the

use

of soyabean oil-meal with

or

without lysine

in growing-finishing pig diets based

on

maize

or

wheat

J.

CASTAING M. LEUILLET*

Association Générale des Producteurs de

Maïs,

64000 Pau

* institut

teclanique

des Céréales et des

Fourrages, 8,

Avenue du Président

Wilson,

75016 Paris

Reduction in the use of

soyabean

oil-meal in cereal based diets

(maize

and

wheat)

was made

in the

following

way :

- - by decreasing

the

dietary

crude

protein

level

during

the

finishing period (6o- 1 0 3 kg) - by L-lysine supplementation

of diets with a low crude

protein

content

during

the

growing-

finishing period

or the

finishing period.

]B

;1 aize

For castvated

males,

a

protein

level of 18 p. ioo till 60

kg

live

weight

followed

by

i4 p. 100till

slaughter

resulted in the

highest growth performances

and the best feed conversion ratios.

For females,

there was no

significant

difference between the results obtained with the

following

allowances :

- 18 p. ioo crude

protein

till 60

kg

live

weight

- 16 p. ioo crude

protein

from

6 0 - 103 kg

live

weight ;

- 18 p. 100crude

protein

till 60

kg

live

weight

- 14 p. roo crude

protein

-!-

lysine supple-

mentation

( 0 . 20

p.

ioo)

from

6 0 - 103 kg

live

weight ;

- iq p. roo crude

protein

+

lysine supplementation during

the whole

growing-finishing period (o.!o

p. ioo till 60

kg

and 0.20p. ioo from 60 to 103

kg).

Wheat

For the two sexes, the best

performances

were obtained with the

following

allowances :

- --

y.! p. 100 crude

protein during

the

growing-finishing period,

- - y.s p. 100 crude

protein

till 60

kg

live

weight,

- i6.!

p. ioo crude

protein

from 60 to 103

kg

live

weight.

Lysine supplementation applied during

the

finishing period

or

during

the whole

growing- finishing period

to a basal diet

containing

14 p. 100crude

protein

did not lead to the same

perfor-

mances as the diets

containing

y.s and

1 6. 7

p. loo crude

protein

and this raises the

question

of

the involvement of other

limiting

factors.

Références

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