Effect of calving to timed artificial insemination interval on fertility of beef cows. 2022

Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
Department of Animal Science, Santa Catarina State University, Chapecó, Santa Catarina, Brazil.

The objectives of this study were to determine the effect of calving to timed artificial insemination (C-TAI) interval on fertility of Bos taurus and Bos indicus cows and to determine the best C-TAI interval to include postpartum cows in TAI programs in each genotype (B. taurus and B. indicus). In experiment 1, a retrospective study was performed, with data from 2,709 TAI in Bos taurus and Bos indicus cows with different C-TAI intervals. There was a positive linear effect of C-TAI interval on the pregnancy probability (p < .0001). However, there was no effect or interaction with the genotype. When C-TAI intervals were grouped in classes, pregnancy rate differed in groups (p < .05). Receiver operating characteristic (ROC) analysis was performed, and it was observed that 52 days would be the better C-TAI interval to maximize fertility in beef cows. According to the previous result, we further stratified into two C-TAI interval groups (≤ 52 days or > 52 days). Cows with C-TAI longer than 52 days (C-TAI > 52) had greater pregnancy rate (56%) than cows with short C-TAI (46%; p < .01). In experiment 2, 18 postpartum beef cows were subjected to TAI protocol at different C-TAI intervals (n = 6 cows per group): 40, 60 or 80 days postpartum. Cows with 60 days of C-TAI had a greater preovulatory follicle diameter than cows with 80 days postpartum (p < .05). The C-TAI interval did not affect (p > .05) the ovulation rate nor the proportion of endometrial polymorphonuclear leucocytes. We conclude that C-TAI interval affects pregnancy rate in both Bos taurus and Bos indicus. We recommend a C-TAI interval longer than 52 days to increase fertility of beef cows included in TAI programs.

UI MeSH Term Description Entries
D007315 Insemination, Artificial Artificial introduction of SEMEN or SPERMATOZOA into the VAGINA to facilitate FERTILIZATION. Artificial Insemination,Eutelegenesis,Artificial Inseminations,Eutelegeneses,Inseminations, Artificial
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D011374 Progesterone The major progestational steroid that is secreted primarily by the CORPUS LUTEUM and the PLACENTA. Progesterone acts on the UTERUS, the MAMMARY GLANDS and the BRAIN. It is required in EMBRYO IMPLANTATION; PREGNANCY maintenance, and the development of mammary tissue for MILK production. Progesterone, converted from PREGNENOLONE, also serves as an intermediate in the biosynthesis of GONADAL STEROID HORMONES and adrenal CORTICOSTEROIDS. Pregnenedione,Progesterone, (13 alpha,17 alpha)-(+-)-Isomer,Progesterone, (17 alpha)-Isomer,Progesterone, (9 beta,10 alpha)-Isomer
D002417 Cattle Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor. Beef Cow,Bos grunniens,Bos indicus,Bos indicus Cattle,Bos taurus,Cow,Cow, Domestic,Dairy Cow,Holstein Cow,Indicine Cattle,Taurine Cattle,Taurus Cattle,Yak,Zebu,Beef Cows,Bos indicus Cattles,Cattle, Bos indicus,Cattle, Indicine,Cattle, Taurine,Cattle, Taurus,Cattles, Bos indicus,Cattles, Indicine,Cattles, Taurine,Cattles, Taurus,Cow, Beef,Cow, Dairy,Cow, Holstein,Cows,Dairy Cows,Domestic Cow,Domestic Cows,Indicine Cattles,Taurine Cattles,Taurus Cattles,Yaks,Zebus
D004973 Estrus Synchronization Occurrence or induction of ESTRUS in all of the females in a group at the same time, applies only to non-primate mammals with ESTROUS CYCLE. Estrus Synchronizations,Synchronization, Estrus,Synchronizations, Estrus
D005260 Female Females
D005298 Fertility The capacity to conceive or to induce conception. It may refer to either the male or female. Fecundity,Below Replacement Fertility,Differential Fertility,Fecundability,Fertility Determinants,Fertility Incentives,Fertility Preferences,Fertility, Below Replacement,Marital Fertility,Natural Fertility,Subfecundity,World Fertility Survey,Determinant, Fertility,Determinants, Fertility,Fertility Determinant,Fertility Incentive,Fertility Preference,Fertility Survey, World,Fertility Surveys, World,Fertility, Differential,Fertility, Marital,Fertility, Natural,Preference, Fertility,Preferences, Fertility,Survey, World Fertility,Surveys, World Fertility,World Fertility Surveys
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012189 Retrospective Studies Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons. Retrospective Study,Studies, Retrospective,Study, Retrospective
D018873 Pregnancy Rate The ratio of the number of conceptions (CONCEPTION) including LIVE BIRTH; STILLBIRTH; and fetal losses, to the mean number of females of reproductive age in a population during a set time period. Live-Birth Pregnancy Rate,Pregnancy Rate, Live-Birth,Pregnancy Rates,Rate, Pregnancy,Rates, Pregnancy,Live Birth Pregnancy Rate,Live-Birth Pregnancy Rates,Pregnancy Rate, Live Birth,Pregnancy Rates, Live-Birth,Rate, Live-Birth Pregnancy,Rates, Live-Birth Pregnancy

Related Publications

Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
June 2006, Journal of dairy science,
Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
December 2015, Animal reproduction science,
Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
September 2007, Journal of dairy science,
Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
August 2018, Animal reproduction,
Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
September 2021, Theriogenology,
Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
December 2023, Reproduction in domestic animals = Zuchthygiene,
Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
May 2004, Journal of dairy science,
Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
March 2024, Journal of dairy science,
Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
November 2012, Journal of animal science,
Juarez Tomazi Filho, and Luiz Francisco Machado Pfeifer, and Clério Antônio Hoefle, and Murilo Farias Rodrigues, and Rogério Ferreira
March 2012, Tropical animal health and production,
Copied contents to your clipboard!