Abstract
BackgroundIt is comprehensively recognized that reduced reproductive efficiency represents a great economic loss to dairy producers. Ovarian cysts and anestrus syndromes are considered the greatest significant causes of low reproductive efficiency in dairy herds worldwide as they detrimentally affect the longevity and profitability of dairy herd. Pregnancy rate is the best available single deciding parameter used for assessment of the reproductive efficiency at the herd level which measures the probability that open cows become pregnant per unit of time. So, the current study was planned to evaluate the suitability of using Ovsynch plus CIDR and G6G resynchronization protocols as an efficient treatment regimen for cystic ovarian diseased cows and anestrus cows, respectively, through comparing pregnancy rates of cystic ovarian diseased cows that subjected to Ovsynch supplemented with controlled internal drug release device with the pregnancy rate of healthy cows that subjected to a Presynch-Ovsynch synchronization protocol, as well as through comparing pregnancy rates of anestrus cows that subjected to G6G treatment protocol with the pregnancy rate of healthy cows. Moreover, possible factors such as breed, parity, and season which may affect the treatment success were also evaluated.ResultsThe results of the current study revealed an overall mean pregnancy rate of 36.64%. Moreover, Simmental cows recorded a greater (p < 0.01) pregnancy rate (45.16%) than that recorded for Holstein cows (34.98%). A highly significant seasonal effect was observed, as a higher (p < 0.01) pregnancy rate was recorded for cows inseminated during cold months (39.54%) compared with that recorded for cows inseminated during hot months (29.18%).ConclusionsNo significant differences were detected in the pregnancy rates among the three breeding programs; thence, the application of the G6G synchronization protocol for anestrus cows and Ovsynch-CIDR synchronization protocol for cows with ovarian cysts could be used as effective treatment regimens as they resulted in nearly the same pregnancy rates that recorded for healthy cows. In addition, the treatment response was highly influenced by cow’s breed, parity, and season of breeding.
Highlights
It is comprehensively recognized that reduced reproductive efficiency represents a great economic loss to dairy producers
Our hypothesis was that application of the G6G and Controlled internal drug release device (CIDR) synch protocols could improve the Pregnancy rater (PR) in acyclic cows which failed to express estrus or failed to conceive after using a PO protocol as well as in cows which suffered from cystic ovarian disease to reach or exceed PR that was recorded for a PO protocol
3 Results Regardless of the effects of season of insemination, breed of the cow, and breeding program, the overall mean PR obtained in the present investigation was 36.64%
Summary
It is comprehensively recognized that reduced reproductive efficiency represents a great economic loss to dairy producers. Presynchronization protocols were performed to augment the proportion of cows in early diestrus stage at the first GnRH dose of the Ovsynch protocol to attain high conception rate (CR) [65] In this aspect, PO is one of the most widespread protocols used to synchronize ovulation for the first artificial insemination (AI) services postpartum in dairy cows [23]. Presynchronization protocols including GnRH and PGF2α were introduced to cope with the restriction of PGF2α-based protocols in anovular cows [61] These programs improved pregnancy outcomes in anovular cows and emphasized that a high percentage of cows were at the ideal phase of the estrous cycle when the Ovsynch protocol was commenced. The effects of cow’s breed and insemination season on the fertility response of the cows to these synchronization protocols were investigated
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