Vaginal mucus resistivity evaluation in cattle: reliability of the swine estrous detector probe during 16th-hour insemination following ovulation synchronization

Synchronization of ovulation and fixed-time artificial insemination in beef cattle.

The main objective of the implementation of artificial insemination (AI) in cattle is to produce a sustained genetic progress in the herd. Although AI is an old reproductive biotechnology, its widespread implementation is very recent and is mainly because of the use of protocols that allows AI without oestrus detection, commonly called fixed-time artificial insemination (FTAI). The development ...

Factors affecting pregnancy rate to estrous synchronization and fixed-time artificial insemination in beef cattle.

Application of AI in extensive beef cattle production would be facilitated by protocols that effectively synchronize ovarian follicular development and ovulation to enable fixed-time AI (TAI). The objectives were to determine whether use of a controlled internal drug release (CIDR) device to administer progesterone in a GnRH-based estrous synchronization protocol would optimize blood progestero...

Estrous Synchronization and Artificial Insemination in Sows: A Field Study

Insemination related factors affecting fertilization in estrous-synchronized cattle

In addition to the requirements for healthy well-managed cattle and the sound application of synchronizing drugs, many other factors can also play a role in determining the success of an AI–estrous synchronization program. Considering the economic investment in semen and drugs, the success of such a program must be judged on the basis of pregnancy rate to the first artificial insemination servi...

Insemination Related Factors Affecting Fertilization in Estrous-synchronized Cattle

Dalton et al. (2004) conducted a field trial with Holstein dairy cattle to determine: 1) the effect of simultaneous thawing of multiple 0.5-mL straws of semen and sequence of insemination (1, 2, 3 or 4) on conception rates, 2) whether conception rates achieved following AI by professional AI technicians (PAI) and herdsman-inseminators (HI) differed, and 3) the effect of elapsed time from initia...