Pregnancy rate after estrus synchronization and timed artificial insemination in Mediterranean buffaloes in two seasons in Venezuela
A retrospective study (2016-2018) was conducted in a commercial farm from Zulia state, Venezuela, to analyze the effectiveness of ovulation synchronization followed by fixed-time artificial insemination (TAI) at two seasons of the year: 1) May-September [unfavorable (U), n=386] 2) October-December...
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Universidad del Zulia
2023-11-01
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| Series: | Revista Científica |
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| Online Access: | https://www.produccioncientificaluz.org/index.php/cientifica/article/view/43452 |
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| author | Miguel Chacón Néstor Morán Iván Cárdenas Mariana S. Perea Fernando P. Perea Aitor De Ondiz |
| author_facet | Miguel Chacón Néstor Morán Iván Cárdenas Mariana S. Perea Fernando P. Perea Aitor De Ondiz |
| author_sort | Miguel Chacón |
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A retrospective study (2016-2018) was conducted in a commercial farm from Zulia state, Venezuela, to analyze the effectiveness of ovulation synchronization followed by fixed-time artificial insemination (TAI) at two seasons of the year: 1) May-September [unfavorable (U), n=386] 2) October-December [favorable (F), n=308]. A total of 694 ovulation synchronization protocols were applied in 190 heifers- and 504 cow-buffalos. In season U, an intravaginal device (IVD) was used for 9 days (day 0: IVD + 2 mg estradiol benzoate; day 9: 200-230 IU eCG; day 11: 1 mg GnRH) and TAI at 64-66 hours post IVD removal. Ovsynch (IATF 16 to 18 hours after the second GnRH injection) or IVD protocols were used in season F. Calving to synchronization interval was 102.2 ± 51.8 and 126.0 ± 74.8 days for seasons U and F, respectively. Data were analyzed by the Chi-square test of SAS. Pregnancy rate (pregnant buffaloes divided by inseminated buffaloes after ovulation synchronization × 100) did not vary between seasons: 43% (166/386) and 45.8% (141/308) for U and F, respectively (p>0.05). In season U, buffalo heifers had a pregnancy rate of 50.8% (62/122) and buffalo cows 39.9% (104/264) (p<0.05). In season F, the pregnancy rate was similar between groups: 44.1% (30/68) and 46.2% (111/240) for heifers and buffalo cows, respectively (p>0.05). In this tropical buffalo herd, the pregnancy rate after IATF was comparable between seasons; however, in the unfavorable season, buffalo heifers were more fertile than buffalo cows.
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| format | Article |
| id | doaj-art-8f7671a0a74f4850a3e80a7c3c0ae60f |
| institution | Kabale University |
| issn | 0798-2259 2521-9715 |
| language | English |
| publishDate | 2023-11-01 |
| publisher | Universidad del Zulia |
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| series | Revista Científica |
| spelling | doaj-art-8f7671a0a74f4850a3e80a7c3c0ae60f2025-02-04T15:37:02ZengUniversidad del ZuliaRevista Científica0798-22592521-97152023-11-0133Suplemento10.52973/rcfcv-wbc106Pregnancy rate after estrus synchronization and timed artificial insemination in Mediterranean buffaloes in two seasons in VenezuelaMiguel Chacón0Néstor Morán 1Iván Cárdenas2Mariana S. Perea3Fernando P. Perea 4Aitor De Ondiz 5Agropecuaria Caño Negro, Zulia, VenezuelaAgropecuaria Caño Negro, Zulia, Venezuela.Departamento de Ing. Producción Animal-Unet, Venezuela.Ejercicio privado. Colombia.Facultad de Ciencias Agropecuarias, Universidad de Cuenca. Cuenca, Ecuador.Facultad de Ciencias Veterinarias, Maracaibo, Venezuela. A retrospective study (2016-2018) was conducted in a commercial farm from Zulia state, Venezuela, to analyze the effectiveness of ovulation synchronization followed by fixed-time artificial insemination (TAI) at two seasons of the year: 1) May-September [unfavorable (U), n=386] 2) October-December [favorable (F), n=308]. A total of 694 ovulation synchronization protocols were applied in 190 heifers- and 504 cow-buffalos. In season U, an intravaginal device (IVD) was used for 9 days (day 0: IVD + 2 mg estradiol benzoate; day 9: 200-230 IU eCG; day 11: 1 mg GnRH) and TAI at 64-66 hours post IVD removal. Ovsynch (IATF 16 to 18 hours after the second GnRH injection) or IVD protocols were used in season F. Calving to synchronization interval was 102.2 ± 51.8 and 126.0 ± 74.8 days for seasons U and F, respectively. Data were analyzed by the Chi-square test of SAS. Pregnancy rate (pregnant buffaloes divided by inseminated buffaloes after ovulation synchronization × 100) did not vary between seasons: 43% (166/386) and 45.8% (141/308) for U and F, respectively (p>0.05). In season U, buffalo heifers had a pregnancy rate of 50.8% (62/122) and buffalo cows 39.9% (104/264) (p<0.05). In season F, the pregnancy rate was similar between groups: 44.1% (30/68) and 46.2% (111/240) for heifers and buffalo cows, respectively (p>0.05). In this tropical buffalo herd, the pregnancy rate after IATF was comparable between seasons; however, in the unfavorable season, buffalo heifers were more fertile than buffalo cows. https://www.produccioncientificaluz.org/index.php/cientifica/article/view/43452Bubalus bubalishormonal protocolTAIseason |
| spellingShingle | Miguel Chacón Néstor Morán Iván Cárdenas Mariana S. Perea Fernando P. Perea Aitor De Ondiz Pregnancy rate after estrus synchronization and timed artificial insemination in Mediterranean buffaloes in two seasons in Venezuela Revista Científica Bubalus bubalis hormonal protocol TAI season |
| title | Pregnancy rate after estrus synchronization and timed artificial insemination in Mediterranean buffaloes in two seasons in Venezuela |
| title_full | Pregnancy rate after estrus synchronization and timed artificial insemination in Mediterranean buffaloes in two seasons in Venezuela |
| title_fullStr | Pregnancy rate after estrus synchronization and timed artificial insemination in Mediterranean buffaloes in two seasons in Venezuela |
| title_full_unstemmed | Pregnancy rate after estrus synchronization and timed artificial insemination in Mediterranean buffaloes in two seasons in Venezuela |
| title_short | Pregnancy rate after estrus synchronization and timed artificial insemination in Mediterranean buffaloes in two seasons in Venezuela |
| title_sort | pregnancy rate after estrus synchronization and timed artificial insemination in mediterranean buffaloes in two seasons in venezuela |
| topic | Bubalus bubalis hormonal protocol TAI season |
| url | https://www.produccioncientificaluz.org/index.php/cientifica/article/view/43452 |
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