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| Campo DC | Valor | Lengua/Idioma |
|---|---|---|
| dc.contributor.author | TOMAZI FILHO, J. | |
| dc.contributor.author | PFEIFER, L. F. M. | |
| dc.contributor.author | HOEFLE, C. A. | |
| dc.contributor.author | RODRIGUES, M. F. | |
| dc.contributor.author | FERREIRA, R. | |
| dc.date.accessioned | 2023-03-15T15:51:10Z | - |
| dc.date.available | 2023-03-15T15:51:10Z | - |
| dc.date.created | 2023-03-15 | |
| dc.date.issued | 2022 | |
| dc.identifier.citation | Reproduction in Domestic Animals, v. 57, p. 936?942., 2022. | |
| dc.identifier.uri | http://www.alice.cnptia.embrapa.br/alice/handle/doc/1152396 | - |
| dc.description | 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 per-formed, 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 geno-type. 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 experi-ment 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 propor-tion 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 in-terval longer than 52 days to increase fertility of beef cows included in TAI programs. | |
| dc.language.iso | eng | |
| dc.rights | openAccess | |
| dc.subject | Endometrial cytology | |
| dc.title | Effect of calving to timed artificial insemination interval on fertility of beef cows. | |
| dc.type | Artigo de periódico | |
| dc.subject.nalthesaurus | Pregnancy rate | |
| dc.subject.nalthesaurus | Reproductive efficiency | |
| riaa.ainfo.id | 1152396 | |
| riaa.ainfo.lastupdate | 2023-03-15 | |
| dc.contributor.institution | JUAREZ TOMAZI FILHO, SANTA CATARINA STATE UNIVERSITY; LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO; CLÉRIO ANTÔNIO HOEFLE, SANTA CATARINA STATE UNIVERSITY; MURILO FARIAS RODRIGUES, SANTA CATARINA STATE UNIVERSITY; ROGÉRIO FERREIRA, SANTA CATARINA STATE UNIVERSITY. | |
| Aparece en las colecciones: | Artigo em periódico indexado (CPAF-RO)  | |
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| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| RDA-2022-Tomazi-Filho-Effect-of-calving-to-timed-artificial-insemination-interval-on-fertility-of.pdf | 682.68 kB | Adobe PDF |  Visualizar/Abrir |
