Relationships between milk production, ovarian function and fertility in high-producing dairy herds in north-eastern Spain.
Reprod Domest Anim
; 43 Suppl 4: 38-43, 2008 Oct.
Article
em En
| MEDLINE
| ID: mdl-18803755
ABSTRACT
In the dairy industry worldwide, reproductive disorders are a major cause of economic losses and a challenge to scientists and technicians. In recent decades, declining fertility and increasing milk production have been widely reported in dairy cattle. In this article, the relationships between milk production, ovarian disorders and fertility in high-producing dairy herds are briefly described. We carried out a retrospective study of 23 204 lactations included in a reproductive control programme in north-eastern Spain, a geographical area experiencing both warm and cool conditions. The data were collected between 1991 and 2007 and refer to cows first inseminated or examined 45-80 days postpartum in five well-managed, commercial, Holstein-Friesian high-producing dairy herds. Ovarian disorders were classified as ovarian inactivity or hypofunction, cystic ovarian disease, sub-oestrus or silent ovulation and sub-luteal function. Ovarian hypofunction and milk production increased throughout the study period and there was a decrease in the pregnancy rate to first artificial insemination (AI). Cows suffering ovarian hypofunction were efficiently treated using combined progestagen-prostaglandin treatments. The incidence of ovarian cysts showed little variation with time. Treatment of this syndrome may include different GnRH-based treatments or manual rupture. During the last 5 years, sub-oestrus was the predominant dysfunction (42.1%) compared with the cystic (6.3%) and ovarian hypofunction (12%) forms. Response of sub-oestrous cows to treatment with luteolitic agents was usually higher than 60%. Ovarian function and fertility were dramatically impaired during the warm period. However, during the later years of the study, the inclusion of fans and water sprinklers for the warm season appeared to overcome the seasonal effect on fertility.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Lactação
/
Bovinos
/
Doenças dos Bovinos
/
Leite
/
Infertilidade Feminina
Tipo de estudo:
Etiology_studies
/
Guideline
/
Observational_studies
/
Risk_factors_studies
Limite:
Animals
/
Pregnancy
País/Região como assunto:
Europa
Idioma:
En
Revista:
Reprod Domest Anim
Assunto da revista:
MEDICINA REPRODUTIVA
/
MEDICINA VETERINARIA
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Espanha