1074 Incidence and risk factors related to anovulation in dairy cows

Monteiro, P. L. J.; Gonzales, B.; Drum, J. N.; Prata, A. B.; Soriano, Sergi; Santos, J. E. P.; Wiltbank, Milo C.; Sartori, Roberto

doi:10.2527/jam2016-1074

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“…Return to cyclicity during the postpartum period is critical for the success of reproductive programs, and the nutrition and management during the transition period is a critical determinant of time to first ovulation. Anovulation at ~60 DIM can range from 5 to 45% in different dairy herds [ 139 ] and is greater in cows that have a greater incidence of health problems and cows losing excessive BCS during the postpartum period [ 133 , 135 , 140 ]. For example, one recent study by [ 140 ] evaluated 943 Holstein cows during the postpartum period and reported that, at 50 DIM, a 17.9% prevalence of anovulation in healthy cows (38.4% of the cows) as compared with 29.8% prevalence in cows with one disease (33.7% of the cows) and 39.5% prevalence in those that had more than one disease (27.9% of the cows).…”

Section: Key Factors That Alter Reproductive Efficiency In Dairy Hmentioning

confidence: 99%

Factors That Optimize Reproductive Efficiency in Dairy Herds with an Emphasis on Timed Artificial Insemination Programs

Consentini

Wiltbank

Sartori

2021

Animals

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Reproductive efficiency is closely tied to the profitability of dairy herds, and therefore successful dairy operations seek to achieve high 21-day pregnancy rates in order to reduce the calving interval and days in milk of the herd. There are various factors that impact reproductive performance, including the specific reproductive management program, body condition score loss and nutritional management, genetics of the cows, and the cow comfort provided by the facilities and management programs. To achieve high 21-day pregnancy rates, the service rate and pregnancy per artificial insemination (P/AI) should be increased. Currently, there are adjustments in timed artificial insemination (TAI) protocols and use of presynchronization programs that can increase P/AI, even to the point that fertility is higher with some TAI programs as compared with AI after standing estrus. Implementation of a systematic reproductive management program that utilizes efficient TAI programs with optimized management strategies can produce high reproductive indexes combined with healthy cows having high milk production termed “the high fertility cycle”. The scientific results that underlie these concepts are presented in this manuscript along with how these ideas can be practically implemented to improve reproductive efficiency on commercial dairy operations.

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