Factores que afectan la preñez en vacas Brahman sometidas a inseminación artificial a tiempo fijo

Factores que afectan la preñez en vacas Brahman sometidas a inseminación artificial a tiempo fijo

RESUMEN

Objetivo. Evaluar la relación entre la condición corporal (CC), la manifestación de estro, las concentraciones plasmáticas de estradiol, el diámetro del folículo mayor y la preñez, en vacas Bos indicus amamantando, sometidas a un protocolo de inseminación artificial a tiempo fijo (IATF). Materiales y métodos. Treinta y ocho vacas Brahman recibieron un dispositivo intravaginal de progesterona + benzoato de estradiol en el día 0; retiro del dispositivo + dinoprost + gonadotropina coriónica equina en el día 9 y la IATF en el día 12. La preñez fue diagnosticada 90 días después de la IATF. Resultados. No hubo efecto de la CC sobre la manifestación de estro, las concentraciones plasmáticas de estradiol o el diámetro del folículo mayor (p>0.05). El diámetro del folículo mayor no influenció las concentraciones plasmáticas de estradiol (p>0.05). El diámetro del folículo mayor y las concentraciones plasmáticas de estradiol no influenciaron la manifestación de estro (p>0.05). La tasa de preñez por IATF no fue afectada (p>0.05) por la CC, la manifestación de estro o las concentraciones plasmáticas de estradiol. Hubo una tendencia (p=0.10) de una relación directa entre el diámetro del folículo mayor y la tasa de preñez por IATF. Conclusiones. La CC, las concentraciones plasmáticas de estradiol y la manifestación de estro no influenciaron la tasa de preñez por IATF en vacas Brahman sometidas a un protocolo de sincronización basado en progesterona. Sin embargo, el diámetro del folículo mayor presentó tendencia al impacto positivo sobre la tasa de preñez por IATF.

1. Baruselli PS, Gimenes LU, Sales JNS. Fisiologia reprodutiva de fêmeas taurinas e zebuínas. Rev Bras Reprod Anim 2007; 31(2):205-211.
3. Baruselli PS, Reis EL, Marques MO, Nasser LF, Bo GA. The use of hormonal treatments to improve reproductive performance of anestrous beef cattle in tropical climates. Anim Reprod Sci 2004; 83:479-486. http://dx.doi.org/10.1016/j.anireprosci.2004.04.025
5. Peres RFG, Claro Júnior I, Sá Filho OG, Nogueira GP, Vasconcelos JLM. Strategies to improve fertility in Bos indicus postpubertal heifers and nonlactating cows submitted to fixed-time artificial insemination. Theriogenology 2009; 72:681–689. http://dx.doi.org/10.1016/j.theriogenology.2009.04.026
7. Sá Filho OG, Dias CC, Lamb GC, Vasconcelos JLM. P r o g e s t e r o n e - b a s e d e s t r o u s synchronization protocols in non-suckled and suckled primiparous Bos indicus beef cows. Anim Reprod Sci 2010; 119:9–16. http://dx.doi.org/10.1016/j.anireprosci.2009.12.011
9. Bó GA, Baruselli PS, Martínez MF. Pattern and manipulation of follicular development in Bos indicus cattle. Anim Reprod Sci 2003; 78:307–326. http://dx.doi.org/10.1016/S0378-4320(03)00097-6
11. Vasconcelos JLM, Sartori R, Oliveira HN, Guenther JG, Wiltbank MC. Reduction in size of the ovulatory follicle reduces subsequent luteal size and pregnancy rate. Theriogenology 2001; 56:307-314. http://dx.doi.org/10.1016/S0093-691X(01)00565-9
13. Sá Filho MF, Crespilho AM, Santos JEP, Perry GA, Baruselli OS. Ovarian follicle diameter at timed insemination and estrous response influence likelihood of ovulation and pregnancy after estrous synchronization with progesterone or progestin-based protocols in suckled Bos indicus cows. Anim Reprod Sci 2010b; 120:23–30.
15. Federación Colombiana de Ganaderos – FEDEGAN. Plan Estratégico de la Ganadería Colombiana 2019. 1ª ed. Bogotá D.C., Colombia: Sanmartín Obregón & Cía; 2006.
17. Meneghetti M, Sá Filho OG, Peres RFG, Lamb GC, Vasconcelos JLM. Fixed-time artificial insemination with estradiol and progesterone for Bos indicus cows I: basis for development of protocols. Theriogenology 2009; 72:179–189. http://dx.doi.org/10.1016/j.theriogenology.2009.02.010
19. Instituto de Hidrología, Meteorología y Estudios Ambientales - IDEAM. Atlas Climatológico de Colombia. Segunda parte: distribución espacio-temporal de las variables del clima. 1a ed. Bogotá D.C., Colombia: Imprenta Nacional de Colombia; 2005, p. 21- 108.
21. Maciel ABB. Proposta de avaliação da condição corporal em vacas Holandesas e Nelore [Tesis de Maestría]. Botucatu, Brasil: Universidade Estadual Paulista – UNESP; 2006.
23. SAS Institute Inc.®: Guide for Personal computer [programa de ordenador]. Versión 5.0. Cary (NC): SAS Institute IC.; 1985.
25. Vasconcelos JLM, Sá Filho OG, Perez GC, Silva AT. Intravaginal progesterone device and/or temporary weaning on reproductive performance of anestrous crossbred Angus x Nelore cows. Anim Reprod Sci 2009; 111:302-311. http://dx.doi.org/10.1016/j.anireprosci.2008.03.012
27. Perry GA, Smith MF, Lucy MC, Green JA, Parks TE, MacNeil MD et al. Relationship between follicle size at insemination and pregnancy success. PNAS 2005; 102(14):5268–5273. http://dx.doi.org/10.1073/pnas.0501700102
29. Sá Filho OG, Meneghetti M, Peres RFG, Lamb GC, Vasconcelos JLM. Fixed-time artificial insemination with estradiol and progesterone for Bos indicus cows II: strategies and factors affecting fertility. Theriogenology 2009a; 72:210–218.
31. Lents CA, White FJ, Ciccioli NH, Wettemann RP, Spicer L J, Lalman DL. Effects of body condition score at parturition and postpartum protein supplementation on estrous behavior and size of the dominant follicle in beef cows. J Anim Sci 2008; 86:2549-2556. http://dx.doi.org/10.2527/jas.2008-1114
33. Meneghetti M, Vasconcelos JLM. Mês de parição, condição corporal e resposta ao protocolo de inseminação artificial em tempo fixo em vacas de corte primíparas. Arq Bras Med Vet Zootec 2008; 60(4):786-793. http://dx.doi.org/10.1590/S0102-09352008000400002
35. Sá Filho MF, Ayres H, Ferreira RM, Marques MO, Reis EL, Silva RCP et al. Equine chorionic gonadotropin and gonadotropinreleasing hormone enhance fertility in a norgestomet-based, timed artificial insemination protocol in suckled Nelore (Bos indicus) cows. Theriogenology 2010a; 73:651-658.
37. Lynch CO, Kenny DA, Childs S, Diskin MG. The relationship between periovulatory endocrine and follicular activity on corpus luteum size, function, and subsequent embryo survival. Theriogenology 2010; 73:190–198. http://dx.doi.org/10.1016/j.theriogenology.2009.08.012
39. Sá Filho OG, Thatcher WW, Vasconcelos JLM. Effect of progesterone and/or estradiol treatments prior to induction of ovulation on subsequent luteal lifespan in anestrous Nelore cows. Anim Reprod Sci 2009b; 112:95-106.
41. Atkins JA, Smith MF, Wells KJ, Geary TW. Fa c to r s a f fe c ting p reovula to ry follicle diameter and ovulation rate after gonado tropin-releasing hormone in postpartum beef cows. Part I: Cycling cows. J Anim Sci 2010; 88:2300-2310. http://dx.doi.org/10.2527/jas.2009-2531
43. Sá Filho MF, Torres-Júnior JRS, Penteado L, Gimenes LU, Ferreira RM, Ayres H, et al. Equine chorionic gonadotropin improves the efficacy of a progestin-based fixed-time artificial insemination protocol in Nelore (Bos indicus) heifers. Anim Reprod Sci 2010c; 118:182-187.
45. Colazo MG, Kastelic JP, Mapletoft RJ. Effects of estradiol cypionate (ECP) on ovarian follicular dynamics, synchrony of ovulation, and fertility in CIDR-based, fixed-time AI programs in beef heifers. Theriogenology 2003; 60:855–865. http://dx.doi.org/10.1016/S0093-691X(03)00091-8
47. Bridges GA, Mussard ML, Burke CR, Day ML. Influence of the length of proestrus on fertility and endocrine function in female cattle. Anim Reprod Sci 2010; 117:208–215. http://dx.doi.org/10.1016/j.anireprosci.2009.05.002
49. Dias CC, Wechsler FS, Day ML, Vasconcelos JLM. P roge s te rone con cen t ra tion s , exogenous equine chorionic gonadotropin, and timing of prostaglandin F2α treatment affect fertility in postpuberal Nelore heifers. Theriogenology 2009; 72:378-385. http://dx.doi.org/10.1016/j.theriogenology.2009.03.006
51. Pinheiro VG, Souza AF, Pegorer MF, Satrapa RA, Ereno RL, Trinca LA et al. Effects of temporary calf removal and eCG on pregnancy rates to timed-insemination in progesterone-treated postpartum Nellore cows. Theriogenology 2009; 71:519-524. http://dx.doi.org/10.1016/j.theriogenology.2008.08.018
53. Figueira Pegorer M, Ereno RL, Satrapa RA, Pinheiro VG, Trinca LA, Barros CM. Neither plasma progesterone concentrations nor exogenous eCG affects rates of ovulation or pregnancy in fixed-time artificial insemination (FTAI) protocols for puberal Nellore heifers. Theriogenology 2011; 75:17-23. http://dx.doi.org/10.1016/j.theriogenology.2010.07.005
55. Sales JNS, Crepaldi GA, Girotto RW, Souza AH, Baruselli PS. Fixed-time AI protocols replacing eCG with a single dose of FSH were less effective in stimulating follicular growth, ovulation, and fertility in suckledanestrus Nelore beef cows. Anim Reprod Sci 2011; 124:12–18. http://dx.doi.org/10.1016/j.anireprosci.2011.02.007
57. Sá Filho MF, Santos JEP, Ferreira RM, Sales JNS, Baruselli PS. Importance of estrus on pregnancy per insemination in suckled Bos indicus cows submitted to estradiol/ progesterone-based timed insemination protocols. Theriogenology 2011; 76:455-463. http://dx.doi.org/10.1016/j.theriogenology.2011.02.022
59. Lopes AS, Butler ST, Gilbert RO, Butler WR. Relationship of pre-ovulatory follicle size, estradiol concentrations and season to pregnancy outcome in dairy cows. Anim Reprod Sci 2007; 99:34-43. http://dx.doi.org/10.1016/j.anireprosci.2006.04.056
61. Cavestany D, Crespi D, Fernández A. Oestrus synchronisation and fixed time artificial insemination in beef heifers. Anim Prod Sci 2010; 50:670-674.
63. Pandey AK, Dhaliwal GS, Ghuman SPS, Agarwal SK. Impact of pre-ovulatory follicle diameter on plasma estradiol, subsequent luteal profiles and conception rate in buffalo (Bubalus bubalis). Anim Reprod Sci 2011; 123:169-174. http://dx.doi.org/10.1016/j.anireprosci.2010.12.003