الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
SUMMARY
This experiment was carried out on rabbits of three
breeds raised in the experimental farm of the Faculty
of Agriculture at Moshtohor during the period from
October 1980 to September 1981. A respective total
nuniliersof 121, 194 and 100 progeny weaned from 13,21
and 10 does of Giza White, Bauscat and Grey Flander
were utilized to study the heat tolerance traits (body
tempera.ture and respiration rate) and their effects on
some productive traits. Depending upon the available
numbers of females within each breed 4, 4 and 3 sire
groupS were formed from Giza White, Bauscat and Grey
Flander, respec~ively. Mating of related animales was
avoided to prevent inbreeding depression.
Single pair mating design was used to estimate
heritability and to evaluate the genetic and the phenotypic
correlation coefficients between the studied traits.
R€:sul ts obtained can be summarized as follows:
A. Heat tolerance traits in does:
1) Both Giza White and Grey Flander doe8 recorded
nearly the aame body temperature (about 39-.00C) and
’>88piration rate (145.9 per minute), while the respective
measurements in Bauscat doel!!J were about 40.00C and
150.3 per minute.
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2) Both morning body temperatufe (39.23°0.) and
rel!lpirationrate (144.7 per minute) were relatively
l~~er than the respective afternoon values (39.38°C
and 149.9 per minute).
3) Both winter body temperature (39.03°C) and
respiration rate (129.4 per minute) were significantly
lower than the respeotive summer values
(39.640C and 168.9 per minute).
4)Weight of doe had no significant effect on
both body temperature and respiration rate either
in.the morning or ~ the afternoon.
5) Both body temperature and respiration rate
were slightly decreased with advanc1ng age, though
d1.fferences in each trait were significant in only
B~~uscat does.
6) Neither pregnancy nor suckling status had
s:tgnificant effects on both body temperature and
rE~spiration rate in Giza White and Grey Flander
dnas. However, suckling status had significant
e~rfecton both traits of heat tolerance in BaUl!lcat
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B. Heat tolerance traits in offspring:
1) Both Giza ~hite and Bauscat rabbits were nearly
of the eame body temperature and respiration rate, while
Grtey Flander recorded slight lower va.lues in most comparable
ages.
2) Both morning body temperature (39.l8°C) and respiration
rate (163.7 per minute) w,ere lower than the
respeotive afternoon values (39.34°0 and 186.7 per minute).
3) Both males and females of all breeds had similar
body temperature (39.27°C) and respiration rate(175.1
per minute).
4) Both body temperature and respiration rate were
s:l.gnifieantly increased by increasing air temperature
a1: most ages.
5) Both winter bodY’ temperat~e (39.26°0) and
rElspirat10n rate (170.0 per minute) were significantly
lower than the respect,ive summervalues (39.28°0 and
1131.7 per minute) •
.” 6) Individual body weight had non-s1gJlifieant
effects on each of body temperature and respiration
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c. Effect of heat tolerance reactions on productive traits:
1) Each of body temperature and respiration rate
of does had no significant effect on both litter size
and litter weight at birth in the three breeds studied.
2) Each of body temperature and respiration rate of
rabbits had no significant effects on their body weight
at most studied ages.
D~ Genetic parameters:
1) Heritability estimates of bdoy temperature in
Giza White were relatively higher than those of BaUBcat
rabbits either in the morning or in the afternoon.
2) Nearly heritability values of respiration rate
were estimated for Giza \fhite and Bau8cat rabbits in
the morning, while the afternoon estimates were almost
negative.
3) Body temperature at a given time of measurement
WB.S possitively associated with respiration rate at
that time.
4) No consistent trend for the association between
body weight and each of heat tolerance traits at all
ages was detected.
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ACKNOWLEDGMENT
The author wishes to express his deep warm gratitude,
obligation and full appreciation to Prof. Dr. E.A. Afifi
Professor of Animal Br.eeding and Head of Animal Production
Department and to Dr. M.S. Hanafi Associate Professor
of Animal production, Faculty of Agriculture at
Moehtohor, Zagazig University, Banha branch for suggesting
the problem, planning this work, effective guidance,
supervision, valuable help, critical cristicism, considerable
interest and effective enoouragement during the
haJ:”dtime and throughout the life span of this work.
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