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Responsiveness to Progestagen‐eCG‐Cloprostenol Treatment in Goat Food Restricted for Long Period and Refed
Author(s) -
Paula NRO,
Galeati G,
Teixeira DIA,
Lopes Júnior ES,
Freitas VJF,
Rondina D
Publication year - 2005
Publication title -
reproduction in domestic animals
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.546
H-Index - 66
eISSN - 1439-0531
pISSN - 0936-6768
DOI - 10.1111/j.1439-0531.2004.00561.x
Subject(s) - ovulation , estrous cycle , nefa , zoology , endocrinology , medicine , biology , estrus synchronization , body weight , induced ovulation , hormone , insulin
Contents For 6 months, 10 adult Saanen crossbred goats were fed undernutrition diet (70% maintenance), and finally five goats were refed for 6 weeks with 150% maintenance. In all animals oestrus was synchronized using 45 mg FGA vaginal sponge for 11 days, 300 IU eCG and 50 μ g cloprostenol 48 h prior to sponge removal. From oestrus onset, during a 24‐h period, blood samples were collected for oestradiol and NEFA assay. Ovulation was verified by laparoscopy 3 days after sponge removal. Body mass loss was 18.62 ± 3.03% of initial weight and in refed goats body weight recovery was 90.63 ± 3.56%. NEFA level was higher in restricted goats (p < 0.05). Fifty per cent of underfed goats (2/4) and all refed goats (4/4) exhibited oestrus and ovulation. Significant relationship (p < 0.05) was found between weight loss and the interval sponge removal‐oestrus onset ( r = 0.91) or ovulation rate ( r = 0.70). Only in the refed group was the ovulation rate related to the oestradiol amount ( r = 0.99) (p < 0.05). Collectively results showed that a short period of improved feeding re‐established the responsiveness of oestrus synchronization in chronically fasted goats.