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25 October 2009 @ 09:43 am
Полная медицинская энциклопедия кроликов.Textbook of Rabbit Medicine.  
Полная медицинская энциклопедия кроликов.Textbook of Rabbit Medicine.Книга ценой 300 баксов))))

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Follicle stimulating hormone (FSH) stimulates
ovarian follicles to develop and produce
oestrogens that cause the female to be recep-
tive. Follicular development occurs in waves
with five to 10 follicles on each ovary being
at the same stage of development at any one
time. When the follicles reach maturity they
produce oestrogen for about 12–14 days. If
ovulation has not occurred during this
period, the follicles degenerate with a corre-
sponding reduction in oestrogen level and
sexual receptivity. After about 4 days a new
wave of follicles begins to produce oestrogen
and the doe becomes receptive again. Many
factors influence this cyclic rhythm including
nutrition, light, temperature, sexual stimula-
tion and individual variation. In general, the
receptive period lasts 14–16 days with a
period of non-receptivity for 1–2 days
(Patton, 1994). Mating stimulates ovulation
approximately 10 hours post coitus (Harkness,
1987). Ovulation can also be induced by
proximity of an entire male, mechanical
stimulation of the vagina or by the act of
being mounted by another female.
Gestation is maintained by progesterone
that is produced exclusively by the ovarian
corpora lutea. In the absence of fetuses,
pseudopregnancy can occur after ovulation
and is maintained by corpora lutea that
degrade after approximately 17 days (Fekete
and Huszenicza, 1993). In the wild,
unfavourable winter conditions or lack of
food suppress follicular activity. Does can be
mated soon after giving birth and may be
lactating and pregnant at the same time.
Litter sizes vary and larger breeds generally
have larger litters (Sandford, 1996). Average
litter size is five to eight, the length of gesta-
tion is 30–32 days so it is possible for a doe
to have six litters in a year and produce 40–50
offspring. The nest is made out of hay or
other bedding material and lined with fur
plucked from the doe’s abdomen and flanks.
Parturition usually takes place in the morning
and is completed in less than half an hour
although, occasionally, young can be born
hours or even days apart (Adams, 1987). The
young are born bald, blind and helpless. Most
passive immunity is obtained before birth,
although some antibodies are present in the
colostrum (Brewer and Cruise, 1994). In the
wild, newly born rabbits or ‘kits’ are cleaned
and nursed by the doe before she leaves the
nest and blocks the entrance. She will stay in
the vicinity of the nest but only returns once
or twice daily to feed the kits for a period of
3–5 minutes during which time a baby rabbit
can drink 20% of its bodyweight (Donnelly,
1997). Rabbit milk is concentrated, containing
13–15% protein, 10–12% fat and 2% carbohy-
drate. The young rabbits emerge from the
nest at about 18 days, start nibbling grass or
hay at 3 weeks and are weaned at about 25
days of age.
1.5 Digestive physiology
The alimentary tract of the rabbit is adapted
for the digestion of large quantities of fibrous
food (Figure 1.1). Rabbits are hindgut
fermenters and rely on microbial fermenta-
tion of food within the caecum to provide
nutrients. In the stomach and small intestine,
digestion and absorption of nutrients is
similar to monogastric mammals. The end-
products of the digestive processes are
separated in the colon into indigestible mater-
ial and substances that can be metabolized by
caecal microorganisms. Separation of the
ingesta depends on particle size. The proxi-
mal colon of the rabbit is specially adapted
for the separation of large particles of

 
 
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Магистр Святой Секты Тамплиеров Добраpritula on October 25th, 2009 08:42 am (UTC)
за кат будет отдельное спасибо )
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