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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Cardoso Consentini, Carlos Eduardo [1] ; Wiltbank, Milo Charles [2] ; Sartori, Roberto [1]
Total Authors: 3
[1] Univ Sao Paulo ESALQ USP, Dept Anim Sci, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil
[2] Univ Wisconsin Madison, Dept Anim & Dairy Sci, Madison, WI 53706 - USA
Total Affiliations: 2
Document type: Review article
Source: ANIMALS; v. 11, n. 2 FEB 2021.
Web of Science Citations: 0

Simple Summary Reproductive efficiency is critical for profitability of dairy operations. The first part of this manuscript discusses the key physiology of dairy cows and how to practically manipulate this reproductive physiology to produce timed artificial insemination (TAI) programs with enhanced fertility. In addition, there are other critical factors that also influence reproductive efficiency of dairy herds such as genetics, management of the transition period, and body condition score changes and improve management and facilities to increase cow comfort and reduce health problems. Using optimized TAI protocols combined with enhancing cow/management factors that impact reproductive efficiency generates dairy herd programs with high reproductive efficiency, while improving health and productivity of the herds. 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. (AU)

FAPESP's process: 17/15904-3 - Innovative pre-synchronization, synchronization and resynchronization programs for FTAI in dairy cows
Grantee:Carlos Eduardo Cardoso Consentini
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 18/03798-7 - Studies on ovarian and uterine physiology and improvement of Assisted Reproduction Technologies to increase reproductive efficiency in cattle
Grantee:Roberto Sartori Filho
Support Opportunities: Research Projects - Thematic Grants