Agriculture Reference
In-Depth Information
Table 7.7 Effect of different synchronization techniques on the reproductive performance of Boer
goat does outside the natural breeding season.
500 IU eCG
No eCG
Item
Sponges
Sponges plus PGF
PGF plus PGF
Sponges
Sponges plus PGF
PGF plus PGF
Number of does
15
15
10
15
15
15
Conception rate %
73.3 a
66.7 a
0
53.3 a
60.0 a
6.7 b
Kidding rate %
146.7 a
166.7 a
0
106.7 a
126.7 a
13.3 b
Fecundity
2.0
2.5 a
0
2.0 a
2.11 a
2.0 b
a,b Means in the same row, with the same superscript indicate no signifi cant difference.
Source: Greyling, 1988 .
SE) estrous response of does following MGA
or FGA treatment to synchronize estrus.
Table 7.8 The mean (
±
Treatment (X
±
SEM)
Variables
MGA (n = 12)
FGA (n = 12)
Time to estrus (h)
86.7
±
3.9 a
44.4
±
1.5 b
Time to LH peak (h)
100.5
±
2.4 c
59.7
±
2.4 d
Withdrawal to ovulation (h)
126.8
±
3.2 c
82.1
±
1.6 d
Estrus to LH peak (h)
14.9
±
1.8 a
15.3
±
0.9 a
Estrus to ovulation (h)
40.1
±
2.3 a
37.6
±
0.5 a
LH peak to ovulation (h)
26.2
±
1.1 c
22.4
±
0.8 d
Peak LH concentration (ng/ml)
19.8
±
2.9 a
22.3
±
3.2 a
Note: Values in a row with different superscript letters (a-d) are
signifi cantly different ( P
0.05).
MGA = Melengestrol acetate; FGA = Fluorogestone acetate.
Source: Martinez Alvarez et al., 2007 .
<
by a single prostaglandin injection is a technique that gives
acceptable conception rates (66.7%) in goats, inside and
outside the natural breeding season (Table 7.8) (Greyling
and Van Niekerk, 1986; Haresign, 1978).
It would thus seem as if especially intravaginal proges-
tagen sponge synchronization (with eCG) programs (as
used in sheep) achieve acceptable high estrous responses
and conception rates in goats and can be used as tools in
the reproductive management of goat does, especially in
combination with AI (Greyling and Van der Nest, 2000;
Motlomelo et al., 2002).
does with semen from a single buck within 3 weeks, com-
pared with 30-50 does per buck in a conventional mating
system.
The technique of artifi cial insemination involves obtain-
ing semen from the male artifi cially and the application of
live part volumes of the semen to a number of does.
The collection and handling of semen with AI must be
seen as an interference with the normal, natural process,
and it can be deleterious to the semen. The aim must
therefore always be to simulate natural conditions as
closely as possible. However, it must be emphasized that
AI is not a cure for infertility.
Following collection of the semen (preferably with the
aid of an artifi cial vagina), AI in brief, involves the deposi-
tion of the evaluated semen (0.05 ml undiluted or 0.1 ml
diluted) in the mouth of the cervix at a fi xed time (minimum
of 50 - 60 × 1 0 6 sperm/insemination dose) 48 and 60 hours
AI in the Doe
The primary purpose of artifi cial insemination (AI) in
goats is to make optimum use of bucks of exceptional
quality, thereby accelerating genetic progress. By using
this method of breeding, it is possible to impregnate 400
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