Oral and Poster Abstracts

concentrations of the goat milk, including colostrum, suggesting the
viability of this thermal treatment, used as alternative to prevent
arthritis encephalitis syndrome (CAE) in newborn kids.
Key words: goat, milk, colostrum
826 Concentrations of Progesterone, Estradiol-17ß and Insulin
like Growth Factor-1 in Baladi Goats after Recombinant
Bovine Somatotropin (rbST) Administration
K. El-Battawy
National Research Centre, Animals Reproduction, Cairo, Egypt
This investigation was carried out to study the impact of rbST
administration on the levels of progesterone, estradiol-17ß and insulin
like growth factor-1 in Baladi goats. Eleven Baladi goats aged 2-3
years were used in this investigation after being assigned randomly into
three groups. First group (rbST+LH group, n=4), each goat was
injected SC with 10mg rbST in 2ml buffer saline daily, starting from
day 5 of synchronized estrous cycle till day 12 of cycle then S/C
pregnyl (LH) was injected at a level of 275 I.U. per animal while each
animal in the second group (rbST group, n=4) was administered only
rbST as previously mentioned. A third group (n= 3) served as control.
Goats were exposed to mature, fertile bucks daily and blood samples
were collected daily. Results indicated that the progesterone
concentrations and estradiol-17ß.
In conclusion, this study confirmed that the administration of rbST
increased the levels of progesterone, estradiol-17ß and IGF-I
827 Stimulation of Oestrous Activity of Female Goats Exposed to
Long Days Treated Sexually Active Males in Different
Months of Seasonal Anoestrous
J. Flores, E. Carrillo, F. Veliz, H. Hernanadez, J. Delgadillo
Centro de Investigación en Reproducción Caprina, Universidad
Autónoma Agraria Antonio Narro, Departamento de Ciencias Médico
Veterinarias, Torreón, Coahuila, Mexico
Objective: This study was carried out to determine the response of
female goats to male effect in different months of seasonal anoestrous
using sexually male goats treated with continuous long days and
untreated males.
Material and Methods: In three months of seasonal anoestrous (April,
May and June), three groups of anovulatory does (a group each month)
were exposed during 15 days to males rendered sexually active with a
treatment of continuous long days (16 h light/day), while other three
groups of does (a group each month) were exposed to untreated males
that only perceived the natural variations of photoperiod (26°N). The
oestrus was detected twice daily during 15 days. The sexual behaviour
of males (nudging, mount intention and complete mounts) was
recorded during 2 h in the first 5 days after male introduction.
Results: In April, the proportion of females showed oestrous behaviour
was higher in does exposed to treated (18/19) than untreated males (0/20;
P0.05) between does stimulated with
treated (20/20 and 18/20, during May and June, respectively) and untreated
males (19/20 and 18/19, during May and June, respectively). The sexual
behaviour of the males treated with continuous long days was greater than
the control males (P0.05).
Conclusions: These results show that oestrous activity of female goats
can be stimulated during April only when sexually active males are
used. In contrast, during May or June, the response of females is similar
when exposed to treated or untreated males. The lack of difference is
likely to be due to the onset of the natural sexual activity of untreated
males, which start in May.
Key word: goats, sexually male goats, anestrus, estrous
828 Exposure to Artificial Long Days During Winter Increases
Milk Production in Saanen Goats from Subtropics
F. Véliz 1 , J. Flores 1 , J. Elizundia 2 , H. Hernandez 1
1 CIRCA, UAAAN, Torreón, Coahuila, Mexico
2 Dirección Particular: Angel Camino 161, Col. Valle del Nazas,
Gómez Palacio, Durango, Mexico
Objectives of the study: The aims of the present study was to
investigate 1) if artificial long days (16 h of light/day) during winter
140 XXV. Jubilee World Buiatrics Congress 2008
may increase the milk production in Saanen goats from subtropical
region and 2) if the milk production is maintained after remove the
photoperiodic treatment.
Materials and Methods: To this end, we used two balanced groups of
Saanen goats with regard to date of parturition, initial milk production,
parity, live weight and condition score. Starting on December 16 th (day 8
± 0.6 postpartum; mean ± sem) one group of goats (n=19) was submitted
daily during first 70 days of lactation to artificial long days (16 h light
/day; Treated group), followed by the natural short days. Simultaneously,
another group of goats (n=19) were maintained under natural variations of
photoperiod (nearly 10 h and 19 min of natural light/day during winter
solstice; Control group) during first 134 days of lactation. In both groups
the weaning of the kids was performed at 30 days postpartum. All goats
were maintained under intensive conditions and were fed alfalfa hay (with
18% of CP) and commercial concentrate (14% CP). Each two weeks, in
all animals milk production in a 24 h-period were assessed through two
machine milking 12-h apart up to 134 days postpartum.
Results: Before the weaning of the kids, milk production did not differ
significantly between the two groups (3.1 ± 0.1 kg in both groups;
P>0.05). In contrast, at days 42, 56 and 70 post-exposition, goats from
long days treated group yielded in average 3.0 kg of milk/day, and
goats from control group only 2.5 kg of milk/day (P