Reproduction in Domestic Animals - Facultad de Ciencias Veterinarias

16 t h International Congress on Animal Reproduction
Poster Abstracts 89
LP ewes (1.2 ± 0.3; P < 0.05), but this was not associated with
differences in numbers of atretic or healthy follicles, follicular
dynamics or metabolic hormone concentrations. Supplemented ewes
had 2.3 ± 0.6 and 2.2 ± 0.6 healthy follicles on Days 3 and 7, less than
control ewes on Day 3 (4.6 ± 0.6; P < 0.01) but the same as controls
on Day 7 (2.0 ± 0.6). The largest healthy follicle from supplemented
ewes was larger (6.1 ± 0.2 mm) with more granulosa cells (3.7 ± 0.2
million) than in non-supplemented ewes (5.4 ± 0.2 mm and 3.0 ± 0.2
million; P < 0.05). Insulin, leptin and IGF-I concentrations were
higher in supplemented than in control ewes (P < 0.01). These results
suggest that, while metabolic hormones explain the positive effect of
short-term supplementation on follicular growth, they are not involved
in the increase in ovulation rate promoted by nutrition during
pregnancy. Meat & Livestock Australia and the University of Western
Australia supported this work.
P184
The use of artificial long days is not effective to induce
reproductive activity in Mediterranean goat does without
isolation from males
Zarazaga, LA 1 *, Gatica, MC 2 , Guzmán, JL 1 , Celi, I 1
1Universidad de Huelva, Carretera de Palos de la Frontera s/n, 21819, Huelva,
Spain; 2 Universidad Arturo Prat, Avda. Arturo Prat, 2120, Iquique, Chile
One experiment was designed to investigate whether the treatment
with artificial long days is effective to induce and synchronize
reproductive activity during the normal seasonal anoestrous in
Mediterranean goat does that were not isolated from males. Two
balanced groups of does according to their body weight (BW) and
body condition score (BCS) were used. One group was subjected to
artificial long days treatment (16L:8O) (LD, N=24) from 17 th
November to 5 th February, and the control group was maintained
under natural photoperiod (C, N=23). From November to May BW
and BCS were measured weekly. Oestrous activity was tested daily
using entire aproned males from the end of the photoperiodic
treatment to the end of the experimental period. Ovulation rate was
evaluated by laparoscopy 7 days after positive identification of
oestrous. Effect of LD treatment and month on BW, BCS, was tested.
The effect of treatment was studied on the date of the first detected
oestrous after the end of LD treatment during the normal seasonal
anoestrous, on the ovulation rate of the first detected oestrous and on
the percentage of females that showed oestrous. No effect of LD
treatment, month or interaction between both variables on BW was
observed. However, BCS was influenced by all analyzed factors (at
least P