Effectiveness of controlled internal drug release device treatment to alleviate reproductive seasonality in anestrus lactating or dry Barki and Rahmani ewes during non-breeding season.

Autor: El-Mokadem MY; Animal Production Research Institute, Agricultural Research Center, Giza, Egypt., Nour El-Din A; Animal Production Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt., Ramadan TA; Animal Production Research Institute, Agricultural Research Center, Giza, Egypt., Rashad AM; Animal Production Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt., Taha TA; Animal Production Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt., Samak MA; Animal Production Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt., Salem MH; Animal Production Department, Faculty of Agriculture (El-Shatby), Alexandria University, Alexandria, Egypt.
Jazyk: angličtina
Zdroj: Reproduction in domestic animals = Zuchthygiene [Reprod Domest Anim] 2018 Apr; Vol. 53 (2), pp. 319-325. Date of Electronic Publication: 2017 Nov 14.
DOI: 10.1111/rda.13107
Abstrakt: This study aimed to evaluate the effectiveness of hormonal treatments on ovarian activity and reproductive performance in Barki and Rahmani ewes during non-breeding season. Forty-eight multiparous ewes, 24 Barki and 24 Rahmani ewes were divided into two groups, 12 lactating and 12 dry ewes for each breed. Controlled internal drug release (CIDR) device was inserted in all ewes for 14 days in conjunction with intramuscular 500 IU equine chronic gonadotrophin (eCG) at day of CIDR removal. Data were analysed using PROC MIXED of SAS for repeated measures. Breed, physiological status and days were used as fixed effects and individual ewes as random effects. Barki ewes recorded higher (p < .05) total number of follicles, number of large follicles, serum estradiol concentration and estradiol: progesterone (E 2 :P 4 ) ratio compared to Rahmani ewes. Lactating ewes recorded higher (p < .05) number of small follicles and lower concentration of total antioxidant capacity (TAC) compared to dry ewes. Number and diameter of large follicles recorded the highest (p < .05) values accompanied with disappearance of corpora lutea at day of mating. Serum progesterone concentration recorded lower (p < .05) value at day of mating and the highest (p < .05) value at day 35 after mating. CIDR-eCG protocol induced 100% oestrous behaviour in both breeds, but Rahmani ewes recorded longer (p < .05) oestrous duration compared to Barki. Conception failure was higher (p < .05) in Barki compared to Rahmani ewes. In conclusion, CIDR-eCG protocol was more potent in improving ovarian activity in Barki compared to Rahmani ewes, but this protocol seems to induce hormonal imbalance in Barki ewes that resulted in increasing conception failure compared to Rahmani ewes.
(© 2017 Blackwell Verlag GmbH.)
Databáze: MEDLINE
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