الفهرس 
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Abstract
1. In the lambing seasons of 1962/1963 and 1963/1964,
74 Rahmani, 82 Ossimi and 29 Fleisch Merino x Rahmani
l!pllbs
crossbred! were born and randomly divided into two
groups one of which was creep-fed and the other was
. non-creep-fed and put under the conventional system
of feeding. Creep feeding started at the age of three
weeks until marketing age, on a mixture ot concentr-atc.s
consisting of 30% ooarse ground barely,_ 4~ cracked
corn, 15%wheat bran and 15%linseed cakes together
with 2% mineral’ salts~
The creep-fed and control lambs were weighed at
24 hours atter birth and at weekly intervale thereafter.
2. The creep-ted lambs proved to have heavier body weights
at weaning and marketing ages than the controls.
3. The crossbred lambs had the highest averege birth
weights, weaning weights and. marketing weishts followed
by Rahmani aJld Ossim1 in both creep-ted a1Ml COntrol
groups.
4. The relative growth rate for 08simi, Rahmani and crossbreds
of both creep-fed and control groups during tpe
two years of the experiment decreased rapidly from birth
till weaning at the age of 17 weeks. The rate of descent
deOlined after the suckling period and with the
advance of age from weaning till marketing, the changes
in the magn1tud~ of the relative growth rate remained
fluctuating Within narrow limits.
5. Year proved to have a significant effect on bodY weights
of lambs in ell breeds and under d1ffe.ren~ nutritional
treatments •.
6 •. Non-ereep-fed lambs showed higher correlation coeffic-
ientsof 0.6 between the estimated amount of milk they
consumed and their body weight gains then their creepfed
contemporaries, as they were more. dependant upon
their dams’ milk until weaning age. This correlation
coefficient declined with advance of age atter the firet
month.
7. In the creep-fed and control lambs, the rumen had. the
fastest growth rate of the four stomachs
8. The reticulum, rum •• omasum, abomasum, 8mall i.c.sti’n,(,
large 1ntes’tlne snd .ec~pped1x had heaYier weight
in the creep-ted 1”that in the controls.
9. The ruments weight, relative to the four stomaohs,
was greater in the creep-fed group, wb.1.1e the abomasum
weight, relative to the four stomachs, was greater in
the control group till the age of six months.
10. ~e four stomachs and the coecum-appendix showed greater
oapacities in the creep-fed group. The reticulo-rumen
showed the fastest rate of increase in volume followed
by the caecum-appendix and omasum-abomasum in this
order.
11. The spleen, kidneys, liver and heart were of heavier
weights in the creep-fed lambs than in the controls.
12•. The weights of the spleen, liver, kidneys and heart,
relative to live-weights, showed a decrease with adv-·
ance ·of age in both groups, the rate ot decrease declined
as age advanced.
13. The carcass percentS$e of the creep-fed lambs was
higher than that of the controls. The former group
showed heavier weights of carcass, fat-tail and testes.
14. The”weights of the head, skin and feet, relative to
11va-weights t were heavier in the control group than
in the creep-fed one.
15. The ercGp””’fedade and female lambs re•.•.•a puberty
at earlier ages and at relatively heavier weights than
the controls. Creep feeding proved to shorten the
time period needed tor reaohing the threshold weight
necessary for puberty.
16. The creep-fed animals had he~vier grease fleece weights
than the controls and the differences were statisticelly
highly significant.
17. The effect of creep feeding on staple length was highly
significant in 1963 t whereas creep feeding did not
have a significant effect on the staple length of
wool shorn in 1962.