title: Strategies to overcome seasonal anestrus in water buffalo.
abstract: Reproductive seasonality in buffalo (Bubalus bubalis) is characterized by behavioral, endocrine, and reproductive changes that occur over distinct periods of the year. During the nonbreeding season (spring and summer), the greater light-dark ratio (long days) suppresses estrus behavior and the occurrence of ovulation. Anestrous buffaloes have insufficient pulsatile of LH to support the final stages of follicular development, and subsequently, estrus behavior and ovulation do not occur, limiting reproductive efficiency, especially in artificial insemination (AI) programs. A number of therapeutic strategies designed to synchronize follicular wave emergence and ovulation have allowed for the use of AI throughout the year, overcoming seasonal anestrus in buffalo. These therapies also improve reproductive performance by increasing the service rate and pregnancy per AI in buffalo herds, regardless of reproductive seasonality.
authors.affiliation: Unidade de Pesquisa e Desenvolvimento de Registro/Polo Regional do D.S.A. do Vale do Ribeira/APTA, Registro, Sao Paulo, Brazil. Electronic address: nelcio@apta.sp.gov.br.
authors.forename: Nelcio Antonio Tonizza
authors.initials: NA
authors.lastname: de Carvalho
authors.affiliation: Departamento de Reprodução Animal, FMVZ-VRA-USP, Sao Paulo, Sao Paulo, Brazil.
authors.forename: Julia Gleyci
authors.initials: JG
authors.lastname: Soares
authors.affiliation: Departamento de Reprodução Animal, FMVZ-VRA-USP, Sao Paulo, Sao Paulo, Brazil.
authors.forename: Pietro Sampaio
authors.initials: PS
authors.lastname: Baruselli
mesh_terms: D000818:Animals; D002020:Buffaloes / Q000502:physiology*; D030762:Estrous Cycle / Q000187:drug effects* / Q000502:physiology; D004973:Estrus Synchronization; D005260:Female; D005300:Fertility Agents, Female / Q000494:pharmacology; D011247:Pregnancy; D012621:Seasons
chemical_list: D005300:Fertility Agents, Female
keywords: Artificial insemination; Buffaloes; Fixed time AI; Pregnancy; Progesterone