Oestrous synchronisation in farmed fallow deer (Dama dama): effects of season, treatment duration and the male on the efficacy of the intravaginal CIDR device

摘要: Abstract In three experiments conducted over successive breeding seasons'we aimed to determine the effects of season, treatment duration and male on incidence oestrus, oestrous synchrony, ovulation fertility in farmed fallow deer following with an intravaginal progesterone device (CIDR-G). Stage season was studied Experiment 1. Synchronisation involved insertion for 14 days, injections prostaglandin analogue (PG) at 10 days later. Eighty mature does were divided into four equal groups that each received least two repeated synchronisation treatments a 9 week period. Treatment initiation staggered between by 7 day intervals from March May span rut. Untreated control (n = 42) mated crayon-harnessed buck define Oestrus recorded 69% occasions 80% among treated after withdrawal. followed 98% occasions. Silent ovulations occurred most frequently early season. An response absent initially but increased 89–100% onset natural rutting. Mean decreased, synchrony improved progressively during study, reflecting pronounced seasonal effect. The investigated 2. Each 80 had inserted 20, 17, 14, 11, or 8 PG 48 h insertion. Device withdrawal synchronously 6 May. Does inseminated laparoscopy 70 detected 84% does, varied more than 90% 14–20 81% 50% 11 respectively (P presence absence within 3. allocated one 30, n 30 28) which run continuously vasectomised buck, isolated bucks until AI, completely throughout study. All synchronised laparoscopically as Differences conception rate ranging 43% ( 13 ) 68% 19 28 ), not significant. Analysis plasma profiles indicated all ovulated These studies have demonstrated marked efficacy CIDR synchronise oestrus deer. Furthermore, it is concluded prerequisite ovulatory response.