SISTEMA PARA INSEMINAÇÃO ARTIFICIAL SEM OBSERVAÇÃO DE ESTRO EM VACAS DE CORTE AMAMENTANDO / ARTIFICIAL INSEMINATION SYSTEM WITHOUT ESTRUS OBSERVATION IN SUCKLED BEEF COWS
AUTOR(ES)
Luiz Felipe Kruel Borges
DATA DE PUBLICAÇÃO
2008
RESUMO
The aim of this study was to develop a timed artificial insemination system (TAI) in suckled beef cows. For this, in 227 cows 60-80 days postpartum, received estradiol benzoate (5mg) and a vaginal device containing 250mg of medroxyprogesterone acetate (MAP; day 0). On day six, prostaglandin analogous (125μg), eCG (400IU) was administered and calves were removed for 88h. The device was removed on day seven (BioRep group) or on day eight (TAI group) and the cows of both groups received GnRH (100μg; day 9) 48h or 24h after device withdrawal, respectively. Experiment I: the follicular growth was daily monitored, from day 6 to day 9 (36h after GnRH), in 14 cows. The average of dominant follicle size on day nine was 11.10.99mm (BioRep, n=7) and 11.50.65mm (TAI, n=7) and all animals ovulated. Experiment II: in the BioRep group (n=106), the cows was observed for estrus behavior after withdrawal the device, twice a day during 48h and inseminated at 12h after detection; In the TAI group (n=107), the devices were withdrawn on day eight and after 24h these cows and those from the BioRep group, which were not stand in estrus, received 100μg of GnRH and TAI 16h later. The pregnancy rates were 57.6% (BioRep) and 52.3% (TAI). The time of MAP exposure and the period from MAP to GnRH did not affect the follicular dynamic and pregnancy rates. Furthermore, the treatment for eight days allows an efficient TAI system in suckled beef cows.
ASSUNTO(S)
postpartum gnrh mpa iatf pós-parto gnrh vacas de corte tai map medicina veterinaria follicular dynamic ovulação dinâmica folicular beef cows ovulation
ACESSO AO ARTIGO
http://coralx.ufsm.br/tede/tde_busca/arquivo.php?codArquivo=1858Documentos Relacionados
- Sistemas de inseminação artificial em dois dias com observação de estro ou em tempo fixo para vacas de corte amamentando
- Sistema de inseminação artificial sem observação de estros em vacas de corte durante período de amamentação
- Conception rate according to sire, body condition score and estrus occurrence of suckled Bos taurus beef cows submitted to timed artificial insemination
- Recursos humanos na inseminação artificial em bovinos de corte
- Timed artificial insemination in high producing holstein cows