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Título:
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Factors affecting the response to the specific treatment of several forms of clinical anestrus in high producing dairy cows
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Autor/a:
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López Gatius, Fernando; Mirzaei, A.; Santolaria Blasco, Pilar; Bech Sàbat, Gregori; Nogareda, Carmina; García Ispierto, Irina; Hanzen, Ch.; Yániz Pérez de Albéniz, Jesús
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Notas:
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This study was designed to examine estrous response rates to the therapeutic treatment of clinical anestrus in high producing
dairy cows and to identify the factors that could affect these rates. Cows with silent ovulation (Subestrus group), cystic ovarian
disease (Cyst group) or ovarian hypofunction (OH group) were given specific treatment for their disorder. Data were derived from
1764 treatments in cows producing a mean of 45.4 kg of milk upon treatment including: 889 subestrous cows, 367 cystic cows and
508 cows with ovarian hypofunction. Cows showing estrus following treatment exhibited a similar pregnancy rate to cows attaining
natural estrus used as reference: 33% (337/1006) and 35% (626/1796), respectively. No significant differences in pregnancy rates
were observed among the Subestrus, Cyst and OH groups (34% (196/571), 34% (44/130), 32% (97/305), respectively. Based on the
odds ratio, an estrous response for all groups was less likely to occur in cows that had suffered previous anestrus, compared to cows
that were anestrous for the first time, whereas the likelihood of an estrous response increased in cows treated after 90 days in milk.
Our results indicate that previous anestrus and a late stage of lactation can have a negative and positive effect, respectively, on the
estrous response to the specific treatment of clinical anestrus shown by high producing dairy cows. Treatment targeted at each type
of clinical anestrus can render similar pregnancy rates to those shown by cows in natural estrus.
This work was supported by the University of Lleida and its collaborating dairy farms, grants C-0295 and C- 0506. The authors thank Ana Burton for assistance with the English translation, the owners and staff of the farms Granja San José and Allué for their cooperation and Paqui Homar for help with the data collection. García- Ispierto and Bech-Sàbat were supported by the FPU grants from the Ministerio de Educación y Ciencia, AP- 2004-4279 and AP-2005-5378, respectively |
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Materia(s):
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-Anestrus
-Anovulatory follicles
-Ovarian cysts
-Estrous response |
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Derechos:
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(c) Elsevier Inc., 2008
info:eu-repo/semantics/restrictedAccess |
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Tipo de documento:
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article
publishedVersion |
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Editor:
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Elsevier
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Compartir:
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