title: Endoscopic transcervical intrauterine artificial insemination in Labrador Retriever bitches.
abstract: Besides post-thawing reduced semen quality, there are some difficulties in the execution of the endoscopic transcervical intrauterine artificial insemination (AI) with frozen-thawed semen in bitches. Therefore, the aims of the present study were to evaluate behavioral and reproductive parameters (i.e., vaginal cytology and serum progesterone level) to determine time of insemination and to investigate the particularities and difficulties of this technique in bitches using fresh semen. Ten Labrador Retriever bitches were submitted to three endoscopic transcervical intrauterine AIs (with 48 h intervals). Oestrus and ovulation period were established by behaviour evaluation, progesterone assays and vaginal cytology, enabling optimal timing for AI during oestrus. During AI, the following aspects were evaluated: cervical os catheterization difficulty, semen deposition resistance, occurrence of semen backflow, and time required to perform the AI. In this study, it was possible to catheterize the cervical os in all bitches, with different degrees of difficulty, by manipulating the equipment to allow cervical visualization and catheter introduction in the cervical canal. Serial serum progesterone assays enabled estimation of LH surge day, and thus of ovulation. The pregnancy rate was 90%, with a litter size of 5.0 ± 2.6 puppies per bitch. It was concluded that the difficulties in the execution of the endoscopic transcervical intrauterine AI technique in Labrador Retriever bitches were minimized by the equipment manipulation and practical experience.
authors: Universidade Federal de Minas Gerais, MG, Brazil.
authors: Sabrina Pereira
authors: SP
authors: Macedo
authors: Christina
authors: C
authors: Malm
authors: Marc Roger Jean Marie
authors: MR
authors: Henry
authors: Luiz Flávio
authors: LF
authors: Telles
authors: Mariana Silva
authors: MS
authors: Figueiredo
authors: Fabíola Bono
authors: FB
authors: Fukushima
authors: Mariana Machado
authors: MM
authors: Neves
authors: Guilherme Albuquerque de Oliveira
authors: GA
authors: Cavalcanti
authors: Marcela Silva
authors: MS
authors: Chaves
authors: Rebeca Marques
authors: RM
authors: Mascarenhas
authors: Monique de Albuquerque
authors: Mde A
authors: Lagares
authors: Valentim Arabicano
authors: VA
authors: Gheller