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Abstract
The objective of this study was to evaluate the influence of the degree of uterine and ovarian development on the pregnancy rate of Girolando heifers submitted to Timed Artificial Insemination (TAI). Fifty-six heifers, representing 100% of the category in the herd studied, were evaluated. The heifers were submitted to a gynecological evaluation, prior to hormonal treatment, with ultrasonography, in order to measure the diameter of the uterine horns and ovaries, as well as evaluate the presence of corpus luteum (CL) and antral follicles. According to the values found for the uterine and ovarian diameters, the animals were classified into scores from one to three. After the gynecological evaluation, all animals were submitted to TAI. There was no statistical difference (P>0.05) in pregnancy rates between the different uterine and ovarian scores, as well as in relation to ovarian structures. However, a statistical difference (P<0.05) was observed in the percentage of animals in anestrous within ovarian scores one, two and three (83.3%, 37.5% and 42.8%, respectively). The conclusion was that uterine and ovarian development did not interfere in the pregnancy rate of Girolando heifers in the herd studied.
References
Andersen, K. J., Lefever, D. G., Brinks, J. S., & Odde, K. G. (1991). The use of reproductive tract scoring in beef heifers. Agricultural Practice, 12, 19-26.
Cammack, K. M., Thomas, M. G., & Enns, R. M. (2009). Review: Reproductive traits and their heritabilities in beef cattle. The Professional Animal Scientist, 25(5), 517-528. http://dx.doi.org/10.15232/S1080-7446(15)30753-1.
Foote, R. H. (2003). Fertility estimation: A review of past experience and future prospects. Animal Reproduction Science, 75(1-2), 119-139. http://dx.doi.org/10.1016/S0378-4320(02)00233-6. PMid:12535588.
Ginther, O. J. (2016). The theory of follicle selection in cattle. Domestic Animal Endocrinology, 57, 85-99. http://dx.doi.org/10.1016/j.domaniend.2016.06.002. PMid:27565235.
Gutierrez, K., Kasimanickam, R., Tibary, A., Gay, J. M., Kastelic, J. P., Hall, J. B., & Whittier, W. D. (2014). Effect of reproductive tract scoring on reproductive efficiency in beef heifers bred by timed insemination and natural service versus only natural service. Theriogenology, 81(7), 918-924. http://dx.doi.org/10.1016/j.theriogenology.2014.01.008. PMid:24560451.
Holm, D. E., Nielen, M., Jorritsma, R., Irons, P. C ., & Thompson, P. N. (2015). Evaluation of pre-breeding reproductive tract scoring as a predictor of long term reproductive performance in beef heifers. Preventive Veterinary Medicine, 118(1), 56-63. http://dx.doi.org/10.1016/j.prevetmed.2014.10.016. PMid:25466217.
Holm, D. E., Nielen, M., Jorritsma, R., Irons, P. C ., & Thompson, P. N. (2016). Ultrasonographic reproductive tract measures and pelvis measures as predictors of pregnancy failure and anestrus in restricted bred beef heifers. Theriogenology, 85(3), 495-501. http://dx.doi.org/10.1016/j.theriogenology.2015.09.031. PMid:26589700.
Holm, D. E., Thompson, P. N., & Irons, P. C . (2009). The value of reproductive tract scoring as a predictor of fertility and production outcomes in beef heifers. Journal of Animal Science, 87(6), 1934-1940. http://dx.doi.org/10.2527/jas.2008-1579. PMid:19286816.
Houghton, P. L ., Lemenager, R . P., Moss, G. E., & Hendrix, K. S. (1990). Prediction of postpartum beef cow body composition using weight to height ratio and visual body condition score. Journal of Animal Science, 68, 1428-1437.
Ireland, J. J., Smith, G . W., Scheetz, D., Jimenez-Krassel, F., Folger, J. L., Ireland, J. L., Mossa, F., Lonergan, P., & Evans, A. C. (2011). Does size matter in females? An overview of the impact of the high variation in the ovarian reserve on ovarian function and fertility, utility of anti-Müllerian hormone as a diagnostic marker for fertility and causes of variation in the ovarian reserve in cattle. Reproduction, Fertility, and Development, 23(1), 1-14. http://dx.doi.org/10.1071/RD10226. PMid:21366975.
Kasimanickam, R. K., Hall, J. B., & Whittier, W. D. (2016). Fertility of Angus cross beef heifers after GnRH treatment on day 23 and timing of insemination in 14‐day CIDR protocol. Reproduction in Domestic Animals, 52(1), 122-129. http://dx.doi.org/10.1111/rda.12866. PMid:27862440.
Macedo, G. G., Oliveira, M., & Rocha, C. D. (2015). Sincronização da ovulação: como mimetizar ainda mais a fisiologia da reprodução para obter melhores resultados? Revista Brasileira de Reprodução Animal, 39, 41-46.
Nascimento, A. A., Pinheiro, N. L., Sales, A., & Viana, J. H. M. (2003). Correlação morfométrica do ovário de fêmeas bovinas em diferentes estádios reprodutivos. Brazilian Journal of Veterinary Research and Animal Science, 40(2), 126-132. http://dx.doi.org/10.1590/S1413-95962003000200006.
Parker Gaddis, K. L., Dikmen, S., Null, D. J., Cole, J. B., & Hansen, P. J. (2017). Evaluation of genetic components in traits related to superovulation, in vitro fertilization, and embryo transfer in Holstein cattle. Journal of Dairy Science, 100(4), 2877-2891. http://dx.doi.org/10.3168/jds.2016-11907. PMid:28131573.
Patterson, D. J., Wood, S. L., & Randle, R . F. (2000). Procedures that support reproductive management of replacement beef heifers. Journal of Animal Science, 77(Suppl.), 1-15. http://dx.doi.org/10.2527/jas2000.00218812007700ES0005x.
Peter, A . T., Vos, P. L. A. M., & Ambrose, D. J. (2009). Postpartum anestrus in dairy cattle. Theriogenology, 71(9), 1333-1342. http://dx.doi.org/10.1016/j.theriogenology.2008.11.012. PMid:19282023.
Rosenkrans, K. S., & Hardin, D. K. (2003). Repeatability and accuracy of reproductive tract scoring to determine pubertal status in beef heifers. Theriogenology, 59(5-6), 1087-1092. http://dx.doi.org/10.1016/S0093-691X(02)01171-8. PMid:12527058.
Silva, A. E. F., Dias, M. J., Dias, D. S. O., Duarte, J. B., & Andrade, J. R. A. (2008). Influência do momento da Inseminação Artificial sobre a fertilidade e o sexo da cria de novilhas da raça Nelore. Ciência Animal Brasileira, 9, 997-1003.
Stevenson, J. L., Rodrigues, J. A., Braga, F. A ., Bitente, S., Dalton, J. C., Santos, J. E. P., & Chebel, R. C. (2008). Effect of breeding protocols and reproductive tract score on reproductive performance of dairy heifers and economic outcome of breeding programs. Journal of Dairy Science, 91(9), 3424-3438. http://dx.doi.org/10.3168/jds.2007-0804. PMid:18765601.
Young, C. D., Schrick, F. N ., Pohler, K. G., Saxton, A. M., Di Croce, F. A ., Roper, D. A ., Wilkerson, J. B., & Edwards, J. L. (2017). Short communication: A reproductive tract scoring system to manage fertility in lactating dairy cows. Journal of Dairy Science, 100(7), 5922-5927. http://dx.doi.org/10.3168/jds.2016-12288. PMid:28478009.
Zavadilová, L., & Stipková, M. (2013). effect of age at first calving on longevity and fertility traits for Holstein Cattle. Czech Journal of Animal Science, 58(2), 47-57. http://dx.doi.org/10.17221/6614-CJAS.
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Copyright (c) 2020 Lara Nogueira Silenciato, Joaquim Esquerdo Ferreira, Samuel Rodrigues Bonamichi do Couto, Otávia Reis e Silva, Osvaldo Almeida Resende, Andressa Ferreira da Silva, Helcimar Barbosa Palhano, Marco Roberto Bourg de Mello