Effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes
ABSTRACT Objective. Was to evaluate the effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes. Materials and methods. Forty five ewes were randomly allocated to one of three treatments: T1(n=15), day 0: sponges with 65 mg medroxyprogesterone acetate (MPA...
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| Format: | Article |
| Language: | English |
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Universidad de Cordoba
2013-10-01
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| Series: | Revista MVZ Cordoba |
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| Online Access: | http://revistas.unicordoba.edu.co/index.php/revistamvz/article/view/126 |
| _version_ | 1828761973887598592 |
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| author | Jaime Martínez T Oziel Montañez V Alejandro Ley De C Fernando Izaguirre F María Velazco Z Juan Aguirre M |
| author_facet | Jaime Martínez T Oziel Montañez V Alejandro Ley De C Fernando Izaguirre F María Velazco Z Juan Aguirre M |
| author_sort | Jaime Martínez T |
| collection | DOAJ |
| description | ABSTRACT
Objective. Was to evaluate the effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes. Materials and methods. Forty five ewes were randomly allocated to one of three treatments: T1(n=15), day 0: sponges with 65 mg medroxyprogesterone acetate (MPA) + 200 IU equine chorionic gonadotropin (eCG) and sponge removal (day 12) + breeding by natural mating (days 12-15); T2 (n=15), day 0: 50 μg gonadotropin releasing hormone (GnRH) + 7.5 mg D-Chloprostenol (day 5) + 50 μg GnRH (day 7) + insemination at fixed time (AIFT) 12 to 14 h after last injection of GnRH; T3 (n=15), 100 μg GnRH (day 0) + 7.5 mg D-Chloprostenol (day 5) + 100 μg GnRH (day 7) + AIFT 12 to 14 h after last injection of GnRH. Results. The average concentration of progesterone (P4) in blood was 1.22 ± 0.74 ng/mL, which was used to verify ovarian activity at the beginning of the treatments. 100% of the T1 ewes presented estrus, beginning at 38.4±9.56 h after sponge removal. There were differences (p<0.05) for pregnancy rates, of 60, 33.33 and 46.66% respectively, among the treatments. Prolificacy was no different (p>0.05) among the treatments where the values were 1.2, 1.4 and 1.4 lambs/ewe for T1, T2 and T3, Conclusions. The results of this study show that the use of GnRH and D-Chloprostenol did improve pregnancy rates but did not improve prolificacy in tropical ewes |
| first_indexed | 2024-12-11T01:37:14Z |
| format | Article |
| id | doaj.art-abd7f78f062a4357a061d5cb4754659d |
| institution | Directory Open Access Journal |
| issn | 0122-0268 1909-0544 |
| language | English |
| last_indexed | 2024-12-11T01:37:14Z |
| publishDate | 2013-10-01 |
| publisher | Universidad de Cordoba |
| record_format | Article |
| series | Revista MVZ Cordoba |
| spelling | doaj.art-abd7f78f062a4357a061d5cb4754659d2022-12-22T01:25:10ZengUniversidad de CordobaRevista MVZ Cordoba0122-02681909-05442013-10-011810.21897/rmvz.126Effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewesJaime Martínez T0Oziel Montañez V1Alejandro Ley De C2Fernando Izaguirre F3María Velazco Z4Juan Aguirre M5Universidad Autónoma de Chiapas, Facultad de Ciencias Agrícolas, Chiapas, MéxicoUniversidad de Guadalajara, Centro Universitario del Sur, Departamento de Desarrollo Regional. Enrique Arreola Silva 883, Ciudad Guzmán, Jalisco. 49000. México.Universidad Autónoma de Chiapas, Facultad de Ciencias Agrícolas, Chiapas, México.Universidad Autónoma de Chiapas, Facultad de Ciencias Agrícolas, Chiapas, MéxicoUniversidad Autónoma de Chiapas, Facultad de Medicina Veterinaria y Zootecnia, Tuxtla Gutiérrez, Chiapas, MéxicoUniversidad Autónoma de Chiapas, Facultad de Ciencias Agrícolas, Chiapas, MéxicoABSTRACT Objective. Was to evaluate the effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes. Materials and methods. Forty five ewes were randomly allocated to one of three treatments: T1(n=15), day 0: sponges with 65 mg medroxyprogesterone acetate (MPA) + 200 IU equine chorionic gonadotropin (eCG) and sponge removal (day 12) + breeding by natural mating (days 12-15); T2 (n=15), day 0: 50 μg gonadotropin releasing hormone (GnRH) + 7.5 mg D-Chloprostenol (day 5) + 50 μg GnRH (day 7) + insemination at fixed time (AIFT) 12 to 14 h after last injection of GnRH; T3 (n=15), 100 μg GnRH (day 0) + 7.5 mg D-Chloprostenol (day 5) + 100 μg GnRH (day 7) + AIFT 12 to 14 h after last injection of GnRH. Results. The average concentration of progesterone (P4) in blood was 1.22 ± 0.74 ng/mL, which was used to verify ovarian activity at the beginning of the treatments. 100% of the T1 ewes presented estrus, beginning at 38.4±9.56 h after sponge removal. There were differences (p<0.05) for pregnancy rates, of 60, 33.33 and 46.66% respectively, among the treatments. Prolificacy was no different (p>0.05) among the treatments where the values were 1.2, 1.4 and 1.4 lambs/ewe for T1, T2 and T3, Conclusions. The results of this study show that the use of GnRH and D-Chloprostenol did improve pregnancy rates but did not improve prolificacy in tropical eweshttp://revistas.unicordoba.edu.co/index.php/revistamvz/article/view/126Estrus synchronizationewespregnancy |
| spellingShingle | Jaime Martínez T Oziel Montañez V Alejandro Ley De C Fernando Izaguirre F María Velazco Z Juan Aguirre M Effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes Revista MVZ Cordoba Estrus synchronization ewes pregnancy |
| title | Effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes |
| title_full | Effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes |
| title_fullStr | Effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes |
| title_full_unstemmed | Effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes |
| title_short | Effect of GnRH and D-Chloprostenol application on pregnancy and prolificacy rates on Pelibuey ewes |
| title_sort | effect of gnrh and d chloprostenol application on pregnancy and prolificacy rates on pelibuey ewes |
| topic | Estrus synchronization ewes pregnancy |
| url | http://revistas.unicordoba.edu.co/index.php/revistamvz/article/view/126 |
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