Produção Nacional
Revisado por pares
Ovarian cysts and their consequences on the reproductive performance of swine herds
2004; Elsevier BV; Volume: 81; Issue: 1-2 Linguagem: Inglês
10.1016/j.anireprosci.2003.08.004
ISSN1873-2232
AutoresC Castagna, Carlos H. Peixoto, Fernando Pandolfo Bortolozzo, Ivo Wentz, Guilherme Borchardt Neto, Fabrı́cio Ruschel,
Tópico(s)Reproductive Physiology in Livestock
ResumoThe aim of this work was to determine the incidence of ovarian cysts in the breeding herd and their consequences in the reproductive performance of the herd. Data from 1990 cyclic sows from two farms, with 0–12 parities, lactation length between 6 and 47 days and weaning-estrus interval between 0 and 32 days were evaluated by ultrasound examination for cyst incidence. As cyst was considered an anaechoic structure with smooth and thin walls with a diameter larger than 2 cm that remained visible for at least 5 days after estrus onset. Cyst incidence was found to be 2.4%. Sows with ovarian cysts have a greater return to estrus rate (34.0×7.7%, P<0.01), and cysts were associated with around 10% of regular and irregular return to estrus patterns on both farms. The adjusted farrowing rate (52.2×90.0%, P<0.01) and anestrual sows that were not pregnant (10.6×0.6%, P 0.05). The incidence of cysts was not influenced by parity (P>0.05). Sows with shorter lactation had a greater incidence of cysts (P<0.05). Sows with a weaning-estrus interval shorter than 3 days had a greater incidence of ovarian cysts (P<0.05). The time of the year had no influence on the incidence of ovarian cysts (P<0.05).
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