1,721,012 research outputs found
Efficiency of superovulatory treatment with FSH-p for in vivo embryo production in dairy ewes: multiple versus single dose regimen
No full textProduzione di latte in asine di razza Martina Franca in rapporto a differenti tempi di separazione del puledro dalla madre e orari di mungitura
No full textAMINO ACIDS COMPOSITION AND THEIR CHANGES DURING LACTATION IN MARTINA FRANCA DONKEY MILK
No full textESTROUS AND FERTILITY RESPONSES OF DAIRY EWES SYNCHRONIZED WITH COMBINED SHORT TERM GnRH, PGF2α AND ESTRADIOL BENZOATE TREATMENTS
No full textThe objective of this study was to asses the effectiveness of short term protocols (5–7 days)
for the synchronization of oestrus in lactating ewes during the non-breeding season, using
combinations of GnRH, PGF2 and estradiol benzoate treatments. One hundred and six
adult cross-bred Altamurana ewes were divided into the following six treatment groups:
(i) Group NT (N= 30), which served as the control, was exposed to fertile rams for a 20
days period; (ii) Group Fe (N= 15) received FGA intravaginal sponges (14 days) + eCG i.m.
(Day 14); (iii) Group GP (N= 15) received a GnRH agonist (Day 0) and PGF2 (Day 5) i.m.
treatment; (iv) Group GPG (N= 15) received a GnRH (Day 0), PGF2 (Day 5) and a second
dose of GnRH (Day 7) i.m.; (v) Group GPE ewes (N= 16) treated with GnRH (Day 0), PGF2
(Day 5) and estradiol benzoate (EB; Day 6, 24 h after PGF2) i.m. treatment; (vi) Group
EPE (N= 15) treated with EB (Day 0), PGF2 (Day 5) and EB (Day 6, 24 h after PGF2) i.m.
treatment. Ewes were checked for oestrus and hand mated using fertile rams. Upon return
to service the ewes were mated again. A definite effect of the treatments on the occurrence
of oestrus was recorded, with a higher percentage of ewes (P < 0.01) exhibiting oestrus in
the Fe (93.3%) and EPE (100%) groups, compared to the GPG (33.3%), GP (46.7%) and GPE
(62.5%) groups. The interval to oestrus was shorter and more synchronized in the long
term treated Fe group (P < 0.01). The fertility rates recorded were 36.7% (11/30) in the NT
or control ewes, and 60.0% (9/15), 33.3% (5/15) and 26.7% (4/15) (not significant) in the
Fe, GP and GPG groups, respectively. In the GPG group the fertility and prolificacy rates
recorded were higher (80% and 175%), than in any of the other treatment groups. In the GPE
group, 10 of the 16 ewes (62.5%) exhibited oestrus, but the fertility rate was significantly
lower (20%, P < 0.01), compared to the other groups (GPG, 80%; GP, 71.4%; Fe, 64.3%). In
Group EPE, despite having the highest percentage of ewes exhibiting oestrus (100%), none
of the ewes lambed. The fertility achieved in all the short term treatment groups following
natural service and oestrous synchronization indicate that the protocols used do not seem
to interfere with the ewes natural cycle or with their fertility. Results indicate that between
the short term treatments studied, the GP and GPG methods offer a potential alternative
to the conventional long term protocol (Fe) for oestrous synchronization in dairy ewes.
Further research is required regarding the use of estradiol benzoate to synchronize oestrus
VALUES ON ENERGETIC, PROTEIC AND HEPATIC SERUM PROFILES IN NEONATAL FOALS OF MARTINA FRANCA DONKEY BREED
No full textEfficienza della somministrazione di Gn-RH e dei tempi di inseminazione uterina con seme congelato sulla performance riproduttiva di pecore da latte sincronizzate con un trattamento corto di cinque giorni
No full textControllo degli estri, delle ovulazioni e della fecondità in pecore da latte: efficienza di un trattamento corto di 5 giorni (FGA+PGF2alfa+ PMSG) ed effetti della associazione del GnRH
No full textMECHANICAL MILKING EFFICIENCY IN RELATION TO PULSATOR FREQUENCY, PARTINIONING OF UDDER MILK STORAGE AND CHARACTERISTICS OF UDDER AND TEAT IN JENNIES (Equus asinus)
No full textImpiego di una tecnica semi-laparoscopica per il prelievo e il trapianto degli embrioni negli ovini e nei caprini
No full textHow the FSH/LH ratio and dose numbers in the p-FSH administration treatment regimen and insemination schedule affect superovulatory response in ewes
No full textWe wished to evaluate the effects of FSH/LH ratio and number of doses of p-FSH during a superovulatory treatment on ovulation rate and embryo production (Experiment I). In Experiment II, we studied the efficacy of fertilization after various insemination schedules in superovulated donors. In Experiment I estrus was synchronized in 40 ewes (FGA, for 9 days plus PGF2 alpha on Day 7) and the ewes were randomly assigned to four treatment groups as follows (n = 10 ewes each): Group A: four p-FSH doses with the FSW/LH ratio held constant (1.6); Group B: four p-FSH doses with the FSH/LH ratio decreasing (FSH/LH 1.6-1.0-0.6-0.3); Group C: eight p-FSH doses with the FSH/LH ratio held constant (1.6); Group D: eight p-FSH doses and FSH/LH ratio decreasing (1.6-1.6, 1.0-1.0, 0.6-0.6, 0.3-0.3). p-FSH administrations were performed twice daily 12 h apart. The ewes were mated at the onset of estrus and again after 12 and 24 h; then, one rain per four ewes was maintained with the ewes for two additional days. Ovarian response and embryo production were assessed on Day 7 after estrus. Experiment II. Three groups (n = 10 each) of superovulated ewes were inseminated as follows: Group M: mated at onset of estrus; Group AI: artificial insemination 30 h after onset of estrus; M + AI) mating at onset of estrus and intrauterine AI performed 30 h from estrus with fresh semen. Results of Experiment I showed that treatment (D) improved (P < 0.05) ovulatory response in comparison to Groups (C) and (A). The fertilization rate was lower (P < 0.01) in Group D) than Group (A). Also the proportion of transferable embryos was lower in Group (D) in comparison to all the other treatments (P < 0.01). Group A gave the best production of embryos (7.3/ewe; 89.0% transferable). In Experiment II, combined mating plus At improved fertilization rate (80.3%) compared to both mating (P < 0.01) and At (P < 0.02) alone
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