comparative study of estrus induction with long-term and short term progesterone in ewes during non-breeding and breeding seasons

The objective of this trial was to compare the efficacy of long-term and short-term progesterone treatments on induction of estrus and pregnancy rate in Rahmani ewes during non-breeding and breeding seasons. Twenty-four animals were randomly grouped for two treatments with intravaginal progesterone device: Group A] during breeding season and Group B] during non-breeding season. Furthermore, both groups were subdivided into two treatments: Al and BI for short-treatment [7 days] and A2 and B2 for long-treatment [12 days]. The progesterone treatment was a vaginal sponge containing 40 mg medroxy progesterone acetate [MAP]. Equine chorionic gonadotrophin [eCG] and cloprostenol [PGF2 alpha] were intramuscularly administered to all ewes at the time of sponge removal. After the detection of estrus, the animals were hand-mated naturally. During the breeding season, mean percentages of estrus and pregnancy were 100% and 83.33%, respectively in both the short-term and long-term treated groups. During the non-breeding season, the average values of estrus were 100% in short-term and 100% for long-term progesterone treatment, but the pregnancy rates were 66.67 and 50.00% in the short- and long-term treated groups, respectively. The treatment with progesterone for short-term [7 days] was effective to induce estrus in sheep during both breeding and non-breeding seasons

Pregnancy rate in Egyptian buffaloes after synchronization of estrus with PGF2alpha or ovulation by ovsynch program [with 2 tables and 2 figures]

Postpartum in buffaloes plays a great role in delay of the cyclicity in buffaloes that seemed to be anestrous. So, the use of hormones to induct estrus or induct ovulation has an importance to increase pregnancy rate. The present study was designed to evaluate the efficacy of the two methods in inducing high pregnancy rate. The experimental animals [48 lactating buffaloes] were divided into three groups: PGF2alpha group 1[n=16]; Ovsynch group 2 [n=16] and control group [n=16]. Pregnancy rate was significantly [p<0.001]increased in group 2 than group 1 and control group due to higher level of progesterone and more accurate synchronization for ovulation., It is more suitable to use the regimen of ovsynch in postpartum buffaloes especially in multiparous females with good condition score