Evaluation of response to selection: effect of freezing on weaning weight and post- weaning daily gain in rabbits Cifre J., Baselga M., Gómez E.A. in

and post- weaning daily gain in rabbits

Cifre J., Baselga M., Gómez E.A.

in

Baselga M. (ed.), Marai I.F.M. (ed.).

Rabbit production in hot climates Zaragoza : CIHEAM

Cahiers Options Méditerranéennes; n. 8 1994

pages 241-245

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--- Cifre J., Baselga M., Gómez E.A. Evalu ation of respon se to selection : effect of freezin g on wean in g weigh t an d post-wean in g daily gain in rabbits. In : Baselga M. (ed.), Marai I.F.M. (ed.).

Rabbit production in hot climates. Zaragoza : CIHEAM, 1994. p. 241-245 (Cahiers Options Méditerranéennes; n. 8)

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OF OF ON

J.; Gómez, E. A.

de Valencia 46071

The effect of

and weight is studied in A effect has been

detected on daily gain. The implications of this effect on the use of evaluate genetic to selection

words:

An of selection is the

estimation of the genetic the

this A classical and well accepted solution

is to have a the same

than the selected a,

sometimes the allowance a is to base heavily on

1984). the

obtained the genetic

and model used (Thompson, 1986) and the acceptance of this methodology is not

methods make use of 1988) semen

allowing the animals to

distant minimizing the

is a well established technique

et al., 1982; et al., of

to evaluate genetic changes, but it be that the technique itself has no effect on the involved in the genetic evaluation.

The of this is to check if the thawing and

affects its a common selection objective in lines of et al., 1989; Estany et al., 1992). ^{_ .}

on weaning weight (WW),

postweaning daily gain (SW). All young

supported by AGF94-O577 (Spain).

to the line V selected size (Estany et al., 1989). One

the control is make up by by dams a

mating and The of females becoming

of pooled frozen vitrified (Losada, 1993).

The was weaned at 28 days the frozen and

vitnBed at 30 days. The out on tuesdays, the of the

mainly on tuesdays but the sundays the most

common days The in the

102 in the and 82 in the

weaning all a fixed of five weeks. The

weight at the end of the fattening it is called weight.

The data have a the following effects:

Treatment: fixed effect with

Season: fixed effect with two (1 993) between

june and july (1993).

class: fixed effect with eleven'levels: level 1 of less than five young alive; level i of i+3 young (i= 2, 3, ... lo), and level 11 of than 13 young.

effect of 62 levels taking into account the females the the lactation. has been assumed that the doe effects

effect of 41 0 levels.

The statistical 1971) to estimate

doe and components, and to estimate fixed

effects using the components estimated by

shows the effects estimated by

The doe and We must note the

the well known fact that this

has et al., 1992) than postweaning daily gain and

weight.

( ^ts2J (

(

ed).

2.63 10.34 0.20 0.055 671 1 27646 0.19 0.057 SW2

3354 7586 0.31 0.075

1 .- Weaning weight in g.

'.- in g.

'.-

values of postweaning daily gain 618 g, 1853 g and 35.3

between season 2 and season 1.

-0.41 0.464 -65.4 23.89 SWZ

-52.6 13.38

w w '

l.- Weaning weight in g.

.-

'.-

'.-

its

2

m.-

2 3 4 5 6

7 8 9 10 11

w w 2 SW3

-30.7 37.96' -8.0 f 67.79 0.58 f 1.318 -78.6 50.53 -80.6 83.66 -0.1 1 1.634 -205.7 38.85 -214.0 f 67.44 -0.28 f 1.313 -207.7 36.64 -159.0 63.45 1.52 f 1.236 -266.5 39.26 -302.6 67.26 -1.18 f 1.311 -247.3 34.41 -237.4 60.28 0.28 f 1.173 -325.3 ^f 34.77 -330.2 ^f 60.76 -0.37 f 1.182 -336.7 34.72 -388.1 61.55 -1.59 1.197 -364.3 45.06 -390.8 78.18 . -0.84 f 1.522 -323.9 39.48 -281.0 68.22 1.14 f 1.329

l . - size classes.

'.-

'.-

'.-

'.-

class 1 and its

The season effects showed in the effect of

on et al., 1992).

on the size class effects. is the of these

effects the these two

and the of size class effects daily

gain This it is indicative of the independence of

to effects.

(b) of size class effects on size classes.

ww'

SW'

-34 f 4.9 -36 f 7.5 -0.07 0.1 13

1 .- Weaning weight in g.

'.-

3 .- g day.

V.- frozen und

vitrified control effects.

w w '

SW2

70.2 f 15.06 14.1 f 26.11 -1.72 0.509

l.- Weaning weight in g.

.- g.

'.- g day.

'.-

its

2

no significant effects on any

studied. The the showed in

V, being significant the weaning weight and daily gain. The can be completely explained by the age of The young of the

weaned at 28 days, while the The daily gain at this age is 34-

37 g/d (Feki, 1994) and consequently the is 70 g in

V. (-1.72 g/d) is the value of the daily gain. This means that

when

it will be (1.72 g/d) to the daily gain data of the

An could be of the but

This solution has the advantage that diminishes the of the inconvenience of

F. (1988) 4* of the (2): 112-119.

J. (1989) Livest. Sci. 21: 67-

J.; (1992) Génét. Sél. Evol. 24:

S. (1994) Études de et de l'efficience

chez of

(Spain).

75.

527-537.

(1972a) 40: 1-15.

(1972b) 40: 193-213.

Y.; S.E.; T.; T.;

(1993) de de of

(1971) 58: 545-554.

(1982) 3'mes la Cunicole,

de; FUENTE, L.F. de la; J. (1989)

C. (1988) 3rd Cattle 1: 159-1 71.

(1984) J. Anim. Sci. 58: 1097-1106.

(1986) Génét. Sél. Evol. 18: 475-484.

E.A. (1992) J. Appl. 15: 884-888.

T.(1992) J. 89: 91-97.

( Spain).

Paris: communication n" 18.

G é d t . S61. Evol. 21: 527-546.