Reusing intravaginal progesterone releasing devices for oestrous synchoronization in ewes

Comparison of two intravaginal progesterone releasing devices in lactating dairy cows: blood progesterone profile and field

Comparison of two intravaginal progesterone releasing devices (PRID-Delta vs CIDR) in dairy cows: blood progesterone profile and field fertility.

Objectives were to compare circulating progesterone (P4) profile and pregnancies per AI (P/AI) of two commercial intravaginal P4 devices (PRID-Delta(®) vs CIDR(®)). In Experiment 1, ovariectomized dairy cows (PRID-Delta, n=6 vs CIDR, n=6) were sampled throughout 7 days to measure circulating P4. In Experiment 2 (PRID-Delta, n=399 vs CIDR, n=375), cows were assigned to treatments, as follows: D0...

Evaluation of the Effect of Progesterone Cidr Devices on Circulating Levels of Progesterone in Cyclic Ewes

Evaluation of the Effect of Progesterone CIDR Devices on Circulating Levels of Progesterone in Cyclic Ewes. (December 2004) Michael Carey Satterfield, B.S., Texas A&M University Co-Chairs of Advisory Committee: Dr. W. Shawn Ramsey Dr. Thomas E. Spencer A homogeneous group of thirty-one crossbred ewes was used to determine the effect of administering a progesterone Controlled Intravaginal Drug R...

Variation in peripheral progesterone concentrations with environmental temperature in ewes on Days 7 and 11 of the oestrous cycle.

Progesterone concentrations in peripheral plasma samples on Days 7 and 11 of oestrous cycles throughout the breeding season showed a negative relationship to the mean minimum environmental temperature for the Days 0-7 and 0-11 respectively of that cycle during which the samples were collected.

Prolonged use of a progesterone-releasing intravaginal device (CIDR) for induction of persistent follicles in bovine embryo recipients

Embryonic mortality after embryo transfer causes substantial economic losses in the cattle industry. This has been related to the inability of the corpus luteum (CL) to secrete enough progesterone (P4) to prepare the endometrium for embryo implantation and maintain pregnancy. Thus, the objective of this experiment was to evaluate the effects of treatments that induce ovulation of a persistent f...