Responsiveness to progestagen-eCG-cloprostenol treatment in goat food restricted for long period and refed.
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 microg 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.
Paula
N R O
NR
Faculdade de Veterinária, Universidade Estadual do Ceará, Fortaleza, Ceará, Brazil.
Galeati
G
G
Teixeira
D I A
DI
Lopes Júnior
E S
ES
Freitas
V J F
VJ
Rondina
D
D
D000821:Animal Feed; D000818:Animals; D003008:Cloprostenol / Q000494:pharmacology*; D004435:Eating / Q000502:physiology*; D004958:Estradiol / Q000097:blood; D004973:Estrus Synchronization / Q000187:drug effects / Q000379:methods / Q000502:physiology; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D005298:Fertility / Q000502:physiology; D005508:Food Deprivation / Q000502:physiology*; D006041:Goats / Q000502:physiology*; D007273:Injections, Intramuscular / Q000662:veterinary; D045167:Progesterone Congeners / Q000494:pharmacology*; D013997:Time Factors; D015431:Weight Loss / Q000502:physiology
D005230:Fatty Acids, Nonesterified; D045167:Progesterone Congeners; D003008:Cloprostenol; D004958:Estradiol