Induced ovulation of yellow catfish (Pelteobagrus fulvidraco) using a combination of a gonadotrop‐releasing hormone analogue and domperidone
Identifieur interne : 000842 ( Main/Merge ); précédent : 000841; suivant : 000843Induced ovulation of yellow catfish (Pelteobagrus fulvidraco) using a combination of a gonadotrop‐releasing hormone analogue and domperidone
Auteurs : Youji Wang [République populaire de Chine] ; Menghong Hu [République populaire de Chine] ; Siu Gin Cheung [République populaire de Chine] ; Paul K. S. Shin [République populaire de Chine] ; Limin Song [République populaire de Chine] ; Weimin Wang [République populaire de Chine]Source :
- Aquaculture Research [ 1355-557X ] ; 2010-07.
English descriptors
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Abstract
The effects of an intraperitoneal hormone injection of gonadotropin‐releasing hormone agonist (D‐Ala6, Pro9‐NEt GnRHa) alone or in combination with a dopamine antagonist, domperidone (DOM), on ovulation induction in yellow catfish Pelteobagrus fulvidraco were tested. The hormone treatments were as follows: 6 mg kg−1 body weight (BW) of carp pituitary extract as a positive control, GnRHa 10, 20, 40 and 80 μg kg−1 BW and a combination of GnRHa and DOM as follows: 10 μg+5 mg, 20 μg+10 mg, 40 μg+20 mg and 80 μg+40 mg kg−1 BW. Physiological saline (0.7% NaCl) was used as a negative control. Significant differences in the ovulation ratio, latency period and ovulation index (OI) were observed among treatments (P<0.05). The combination of GnRHa and DOM at doses of 40 μg+20 mg kg−1 BW had higher values of the ovulation ratio and OI, and a shorter latency period compared with other treatments. The highest OI in GnRHa treatments was only 56.67%, suggesting a dopaminergic tone on gonadotropin secretion in this fish at the pre‐ovulatory stage. Therefore, ovulation can be successfully induced in yellow catfish with 40 μg kg−1 GnRHa+20 mg kg−1 DOM without affecting the egg quality.
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DOI: 10.1111/j.1365-2109.2009.02411.x
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<front><div type="abstract" xml:lang="en">The effects of an intraperitoneal hormone injection of gonadotropin‐releasing hormone agonist (D‐Ala6, Pro9‐NEt GnRHa) alone or in combination with a dopamine antagonist, domperidone (DOM), on ovulation induction in yellow catfish Pelteobagrus fulvidraco were tested. The hormone treatments were as follows: 6 mg kg−1 body weight (BW) of carp pituitary extract as a positive control, GnRHa 10, 20, 40 and 80 μg kg−1 BW and a combination of GnRHa and DOM as follows: 10 μg+5 mg, 20 μg+10 mg, 40 μg+20 mg and 80 μg+40 mg kg−1 BW. Physiological saline (0.7% NaCl) was used as a negative control. Significant differences in the ovulation ratio, latency period and ovulation index (OI) were observed among treatments (P<0.05). The combination of GnRHa and DOM at doses of 40 μg+20 mg kg−1 BW had higher values of the ovulation ratio and OI, and a shorter latency period compared with other treatments. The highest OI in GnRHa treatments was only 56.67%, suggesting a dopaminergic tone on gonadotropin secretion in this fish at the pre‐ovulatory stage. Therefore, ovulation can be successfully induced in yellow catfish with 40 μg kg−1 GnRHa+20 mg kg−1 DOM without affecting the egg quality.</div>
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