Fixed-time artificial insemination in beef cattle with prolonged proestrus of 60 and 72 hours
Fixed- time artificial insemination (IATF, in Spanish) in beef cattle has provided the use of genetically superior bulls in order to maximize the quality of calves. However, implementing this reproductive technique has proved to be difficult to apply in heifers nursing calves for several months of lactancy. An immediate solution to fertility decline of cattle includes the use of hormones. Some hormonal treatments have been developed which are able to control the moment of the first artificial insemination (IA) and the following inseminations in non- pregnant heifers as well as for the treatment of anestrus. The objective of this work was to evaluate two protocols with prolonged proestrus performing artificial insemination at fixed time at 60 or 72 hours in dual purpose cattle from the Ecuadorian Amazon. The study was held from October 2015 to October 2016. A total of 226 multiparious Brows Swiss cattle with nursing calves were inseminated at 60 (T1, n=115) and at 72 (T2, n=111) hours after removing the progesterone device., The conception rate for T1 was 61% (70/115) and for T2: 47% of pregnancy (52/111), showing significant differences (p≤0.05). The estrus was expressed on average by 70.8%, with no significant difference between the protocols (P = 3.15, p≥0.082), for T1 it was 76% (87/115) and for T2 of 65%. The follicular growth at the withdrawal of the progesterone device (T1: 9.53 ± 0.11 mm, T2: 9.87 ± 0.12 mm), the IATF (T1: 12.3 ± 0.12 mm; T2: 11.9 ± 0.12 mm), and the corpus luteum size (T1: 23.1 0.14±mm; T2:22.8 0.15 ±mm) did not show significant differences p≥0.5 between both protocols. It was concluded that both protocols did not show significant differences regarding follicular development at the time of withdrawal of the IATF device and the size of the corpus luteum size measured at day seven after withdrawal. However, the pregnancy rate was higher for the 60-hour protocol.
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Universidad de Costa Rica
2018
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Yánez-Avalos, Darwin Omar Lépez Parra, Juan Carlos Moyano Tapia, Juan Carlos Quinteros Pozo, Roberto Orlando Marini, Pablo Roberto |
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Yánez-Avalos, Darwin Omar Lépez Parra, Juan Carlos Moyano Tapia, Juan Carlos Quinteros Pozo, Roberto Orlando Marini, Pablo Roberto Fixed-time artificial insemination in beef cattle with prolonged proestrus of 60 and 72 hours |
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Yánez-Avalos, Darwin Omar Lépez Parra, Juan Carlos Moyano Tapia, Juan Carlos Quinteros Pozo, Roberto Orlando Marini, Pablo Roberto |
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Yánez-Avalos, Darwin Omar |
| title |
Fixed-time artificial insemination in beef cattle with prolonged proestrus of 60 and 72 hours |
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Fixed-time artificial insemination in beef cattle with prolonged proestrus of 60 and 72 hours |
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Fixed-time artificial insemination in beef cattle with prolonged proestrus of 60 and 72 hours |
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Fixed-time artificial insemination in beef cattle with prolonged proestrus of 60 and 72 hours |
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Fixed-time artificial insemination in beef cattle with prolonged proestrus of 60 and 72 hours |
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fixed-time artificial insemination in beef cattle with prolonged proestrus of 60 and 72 hours |
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Fixed- time artificial insemination (IATF, in Spanish) in beef cattle has provided the use of genetically superior bulls in order to maximize the quality of calves. However, implementing this reproductive technique has proved to be difficult to apply in heifers nursing calves for several months of lactancy. An immediate solution to fertility decline of cattle includes the use of hormones. Some hormonal treatments have been developed which are able to control the moment of the first artificial insemination (IA) and the following inseminations in non- pregnant heifers as well as for the treatment of anestrus. The objective of this work was to evaluate two protocols with prolonged proestrus performing artificial insemination at fixed time at 60 or 72 hours in dual purpose cattle from the Ecuadorian Amazon. The study was held from October 2015 to October 2016. A total of 226 multiparious Brows Swiss cattle with nursing calves were inseminated at 60 (T1, n=115) and at 72 (T2, n=111) hours after removing the progesterone device., The conception rate for T1 was 61% (70/115) and for T2: 47% of pregnancy (52/111), showing significant differences (p≤0.05). The estrus was expressed on average by 70.8%, with no significant difference between the protocols (P = 3.15, p≥0.082), for T1 it was 76% (87/115) and for T2 of 65%. The follicular growth at the withdrawal of the progesterone device (T1: 9.53 ± 0.11 mm, T2: 9.87 ± 0.12 mm), the IATF (T1: 12.3 ± 0.12 mm; T2: 11.9 ± 0.12 mm), and the corpus luteum size (T1: 23.1 0.14±mm; T2:22.8 0.15 ±mm) did not show significant differences p≥0.5 between both protocols. It was concluded that both protocols did not show significant differences regarding follicular development at the time of withdrawal of the IATF device and the size of the corpus luteum size measured at day seven after withdrawal. However, the pregnancy rate was higher for the 60-hour protocol. |
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Universidad de Costa Rica |
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2018 |
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https://revistas.ucr.ac.cr/index.php/agromeso/article/view/29503 |
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oai:portal.ucr.ac.cr:article295032023-06-16T13:47:47Z Fixed-time artificial insemination in beef cattle with prolonged proestrus of 60 and 72 hours Inseminación artificial a tiempo fijo en vacas con proestro prolongado de 60 y 72 horas Yánez-Avalos, Darwin Omar Lépez Parra, Juan Carlos Moyano Tapia, Juan Carlos Quinteros Pozo, Roberto Orlando Marini, Pablo Roberto estradiol progesterona folículos ováricos ovulación inducida gestación. estradiol progesterone ovarian follicles induced ovulation pregnancy. Fixed- time artificial insemination (IATF, in Spanish) in beef cattle has provided the use of genetically superior bulls in order to maximize the quality of calves. However, implementing this reproductive technique has proved to be difficult to apply in heifers nursing calves for several months of lactancy. An immediate solution to fertility decline of cattle includes the use of hormones. Some hormonal treatments have been developed which are able to control the moment of the first artificial insemination (IA) and the following inseminations in non- pregnant heifers as well as for the treatment of anestrus. The objective of this work was to evaluate two protocols with prolonged proestrus performing artificial insemination at fixed time at 60 or 72 hours in dual purpose cattle from the Ecuadorian Amazon. The study was held from October 2015 to October 2016. A total of 226 multiparious Brows Swiss cattle with nursing calves were inseminated at 60 (T1, n=115) and at 72 (T2, n=111) hours after removing the progesterone device., The conception rate for T1 was 61% (70/115) and for T2: 47% of pregnancy (52/111), showing significant differences (p≤0.05). The estrus was expressed on average by 70.8%, with no significant difference between the protocols (P = 3.15, p≥0.082), for T1 it was 76% (87/115) and for T2 of 65%. The follicular growth at the withdrawal of the progesterone device (T1: 9.53 ± 0.11 mm, T2: 9.87 ± 0.12 mm), the IATF (T1: 12.3 ± 0.12 mm; T2: 11.9 ± 0.12 mm), and the corpus luteum size (T1: 23.1 0.14±mm; T2:22.8 0.15 ±mm) did not show significant differences p≥0.5 between both protocols. It was concluded that both protocols did not show significant differences regarding follicular development at the time of withdrawal of the IATF device and the size of the corpus luteum size measured at day seven after withdrawal. However, the pregnancy rate was higher for the 60-hour protocol. La inseminación artificial a tiempo fijo (IATF) en ganado bovino ha permitido el uso de toros genéticamente superiores para maximizar la calidad de los terneros producidos. Sin embargo, la implementación de esta técnica reproductiva dificulta su aplicación en hembras bovinas que están con cría al pie durante varios meses de lactancia. Una solución inmediata a la disminución de la fertilidad en vacas incluye la utilización de hormonas. Se ha desarrollado una serie de tratamientos hormonales que es capaz de controlar el momento de la primera inseminación artificial (IA) y las inseminaciones posteriores en vacas no preñadas y para el tratamiento de vacas en anestro. El objetivo de este trabajo fue evaluar dos protocolos con proestro prolongado con inseminación artificial a tiempo fijo (IATF) a las 60 o 72 horas, en vacas doble propósito de la Amazonía Ecuatoriana. El trabajo se realizó desde octubre de 2015 a octubre de 2016. Se inseminaron 226 vacas multíparas cruzas Pardo Suizo con cría al pie, a las 60 (T1, n=115) y 72 (T2, n= 111) horas de retirado el dispositivo con progesterona (0,5g). La tasa de concepción para T1 fue del 61% (70/115) y para T2: el 47% de preñez (52/111), con diferencias significativas (p≤0,05). El celo en promedio fue de 70,8%, sin diferencia significativa entre tratamientos (P=3,15; p≥0,082), para T1 fue del 76% y para T2 del 65%. El crecimiento folicular al retiro del dispositivo con progesterona (T1: 9,53±0,11 mm; T2: 9,87± 0,12 mm), la IATF (T1: 12,3±0,12 mm; T2: 11,9±0,12 mm) y el tamaño del cuerpo lúteo (T1: 23,1±0,14 mm; T2: 22,8± 0,15 mm)), no mostraron diferencias significativas entre ambos protocolos (p≥0,05). Ambos tratamientos no mostraron diferencias significativas para el desarrollo folicular al momento del retiro del dispositivo de IATF y en el tamaño del cuerpo lúteo medido al día siete posterior a la misma. La tasa de preñez fue superior para el protocolo de 60 horas. Universidad de Costa Rica 2018-05-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article application/pdf text/html application/epub+zip application/vnd.openxmlformats-officedocument.wordprocessingml.document https://revistas.ucr.ac.cr/index.php/agromeso/article/view/29503 10.15517/ma.v29i2.29503 Agronomía Mesoamericana; 2018: Agronomía Mesoamericana: Vol. 29, Issue 2 (May-August); 363-373 Agronomía Mesoamericana; 2018: Agronomía Mesoamericana: Vol. 29, Nº 2 (Mayo-Agosto); 363-373 Agronomía Mesoamericana; 2018: Agronomía Mesoamericana: Vol. 29, Issue 2 (May-August); 363-373 2215-3608 1021-7444 spa https://revistas.ucr.ac.cr/index.php/agromeso/article/view/29503/32489 https://revistas.ucr.ac.cr/index.php/agromeso/article/view/29503/32490 https://revistas.ucr.ac.cr/index.php/agromeso/article/view/29503/32939 https://revistas.ucr.ac.cr/index.php/agromeso/article/view/29503/35459 |