An echographic study of follicular growth during induced estrus in female Azawak zebu in Niger

作者：Garba Mahamadou Moussa^*; Issa Moumouni; Marichatou Hamani; Hanzen Christian

来源：Tropical Animal Health and Production, 2015, 47(7): 1357-1361.

DOI：10.1007/s11250-015-0871-y

• Bos indicus
• Echography
• Estrus
• Ovulation
• PGF(2 alpha)
• Progesterone
• ECG

An echographic study of follicular growth up to ovulation was carried out on 42 lactating Azawak cows (Bos indicus) after estrus induction by means of a PGF(2 alpha) or a procedure involving the administration of progesterone vaginally (PRIDA (R) DELTA: progesterone-releasing intravaginal device) for a 10-day period and the injection of a PGF(2 alpha) and an ECG (400 and 800 IU) on withdrawal. All the animals were inseminated 12 and 24 h after the onset of estrus. The percentage of estrus induced was not significantly different between the two groups of animals (81 %). The average time delay before the onset of estrus was significantly longer after injection of a PGF(2 alpha) (84.8 A +/- 26.0 h) than after withdrawal of the PRIDA (R) (59.2 A +/- 5.8 h). The average duration of the estrus was significantly shorter after its induction by PGF(2 alpha) (12.6 A +/- 2.6 h) than after induction by progesterone (22.9 A +/- 2.7 h). There was not a significant difference in the interval between the beginning of estrus and ovulation in animals treated by PGF(2 alpha) (30.3 h) and progesterone (28.4 h). Injection of a PGF(2 alpha) was accompanied by a significantly lower rate of gestation than that obtained after treatment of animals by progesterone (31.2 vs 54.5 %). These results confirm the necessity to adapt an insemination policy to hormonal treatment for estrus induction in B. indicus.

• 出版日期2015-10