Abstract

Two experiments were carried out on Ionica dairy goats in order to test the efficiency of: 1) short 14 term-5day combined progestogen-PGF2α-GnRH treatments on induction/ synchronization of 15 oestrus and fertility after natural mating in lactating goats and during the transition period 16 (Experiment 1); 2) short term- 9day FGA-PGF2α-eCG treatments on synchronizing oestrus and 17 ovulation (Experiment 2.1) and artificial insemination (AI) fixed time system in synchronized does 18 (Experiment 2.2), during the breeding season. In Experiment 1, four treatment groups (N ═ 24) were considered: 1) FPe-11d - control, FGA intravaginal sponges (11 days) + PGF2α (9th19 d) + eCG (11th d); 2) FPe-5d, FGA (5 days) + PGF2α (5thd) + eCG (5th 20 d); 3) PFe-5d, PGF2α (D0) + FGA (5 days) + eCG (5th d); 4) GPe-5d, GnRH (D0) + PGF2α (5th d)+ eCG (5th 21 d). Goats were checked for 22 oestrus and naturally mated. The occurrence of oestrus were 75.0, 78.3, 86.4, and 58.3% for groups 23 1 to 4, respectively, with significant differences (P<0.05) between groups 3 and 4. Interval to 24 oestrus was earlier (P<0.05) in GPE-5d than in FPe-11d control group. There were no differences 25 between the groups (P>0.05) in fertility or in prolificacy. In Experiment 2.1, twenty-two goats were subdivided into 2 treatment groups (N ═ 11): T1) FPe-11d (control), FGA (11 days) + PGF2α (9th 26 *Manuscript 2 d) + eCG (11th d); T2) FPe-9d, FGA (9 days) + PGF2α (727 th d) + eCG (9th d). Oestrus and ovulation 28 times were monitored every 4 h; ovulation rate was also determined. The induction of oestrus 29 ranged from 91 to 100% and all goats ovulated. Intervals to oestrus, from the onset of oestrus to 30 ovulation, from sponge removal to ovulation, and ovulation rates were 28.2±4.9 and 26.0 ± 4.0 h, 31 25.3±9.2 and 28.9 ± 7.4 h, 53.5±7.6 and 54.9 ± 7.1 h, 3.7 ± 1.6 and 2.4 ± 1.4 corpora lutea (P<0.05) 32 for T1 and T2, respectively. In T2 a great abnormal ovulatory response was observed. In 33 Experiment 2.2, forty-eight goats were synchronized with FPe-9d treatment and subjected to AI, 34 performed 50 h after s.r. with frozen semen, and subdivided into 2 AI system groups (N ═ 24): T3, exocervical AI (100x106 Spz/doe); T4, intrauterine AI (20x106 35 Spz/doe). Fertility rate was higher 36 (P<0.05) in T3. It seems that short term-5-day combined progestogen- PGF2α-GnRH-eCG 37 treatments need to be investigated for AI fixed time.

Autore Pugliese

• D'alessandro Angela Gabriella

Tutti gli autori

• D'ALESSANDRO A.G.

Titolo volume/Rivista

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Anno di pubblicazione

2011

ISSN

0378-4320

ISBN

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Numero di citazioni Wos

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Settori ERC

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