| Autor: |
Erika Aline Ribeiro Dias, Rubens Paes de Arruda, Roni Aprecido Videschi, Hugo Borges Graff, Alessandra de Moraes Sousa, Fabio Morato Monteiro, Enilson Geraldo Ribeiro, Janaina Torres Carreira, Halim Atique Netto, Rogério Fonseca Guimarães Peres, Leticia Zoccolaro Oliveira |
| Jazyk: |
English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Boletim de Indústria Animal, Vol 70, Iss 3, Pp 215-220 (2013) |
| Druh dokumentu: |
article |
| ISSN: |
1981-4100 |
| DOI: |
10.17523/bia.v70n3p215 |
| Popis: |
The aim of this study was to evaluate the conception rate (CR) of multiparous Nelore cows presenting different body condition scores (BCS), which were submitted to the same Timed-AI protocol with equine chorionic gonadotrophin (eCG). A total of 1574 cows were inseminated, between 40 and 50 days postpartum. During insemination (timed-AI), all data regarding to bull (n=8), inseminator (n=3) and BCS (1 to 5) were recorded. The pregnancy diagnosis was performed, by ultrasonography, 40 days after timed-AI. No effect (P>0.05) of inseminator or bull was observed. No statistical difference was also observed between the groups of animals with different BCS. The animals with lower BCS (Group 1 = BCS 1.5 to 2.0; n = 139) had a CR of 47.4%. The animals with BCS from 2.5 to 2.75 (Group 2; n = 741) and BCS from 3.0 to 3.25 (Group 3; n = 463) had a CR of 47.6% and 51.2%, respectively. The animals with higher BCS (Group 4 = BCS 3.5 to 4.0; n = 231) had a CR of 45.3% (P > 0.05). It was concluded that conception rates were similar between the animals presenting different BCS in the herd, likely because the eCG minimized the effects of low LH pulsatility in animals presenting reduced nutritional condition. However, other studies are recommended to verify the real need of using eCG in animals with body condition exceeding 3.5. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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