RESUMO
1. Birchen and Blue Leonesa are two endangered chicken breeds mainly raised in Curueño Valley in North Spain. The establishment of a germplasm bank to guarantee the preservation of these breeds is needed. However, cockerels from different breeder flocks can show variance in semen cryoresistance.2. The following work focused on the sperm characterisation and cryopreservation of Birchen and Blue Leonesa cockerels from four different breeders. A total of 30 semen pools were analysed. Besides conventional sperm analysis, including motility by computer-aided sperm analysis (CASA) and DNA fragmentation by TUNEL, the present study tested a double staining method (MitoTrackerTM Green FM/propidium iodide). This gave simultaneous assessment of plasma and acrosomal and mitochondrial membranes, which were previously validated by SYBR-14/PI, CASA, aniline blue and TUNEL.3. No significant differences were found among fresh semen variables between breeds and breeders. For post-thawed variables, significant differences (P < 0.05) were found between breeders in sperm viability (58.0 ± 1.90 breeder D vs. 35.2 ± 7.41 breeder A, 37.2 ± 4.09 breeder B and 22.3 ± 5.92 breeder C) and DNA fragmentation (62.4 ± 9.91 breeder C vs. 31.8 ± 7.08 breeder B and 24.5 ± 5.49 breeder D). The lowest DNA fragmentation values for semen from breeder D birds were coincident with higher integrity of the mitochondrial membrane.4. The results revealed higher sperm cryoresistance in the cockerels from one of the breeders, possibly due to differences in management system (e.g. diet, housing, control of stress elements and pathogens, reproduction practices or maintenance of genetic diversity). These differences may determine the sperm freezability, and thus the effectiveness of developing a germplasm bank.
Assuntos
Preservação do Sêmen , Animais , Galinhas/genética , Criopreservação/métodos , Criopreservação/veterinária , Masculino , Melhoramento Vegetal , Análise do Sêmen/veterinária , Preservação do Sêmen/métodos , Preservação do Sêmen/veterinária , Motilidade dos Espermatozoides , EspermatozoidesRESUMO
The aims of this study were to homogenize priority 1 surgical indications in Galician hospitals and propose a methodology designed to ensure that that the waiting times of priority 1 patients do not exceed 30 days. The priority 1 surgical indications of the distinct surgical services in Galicia were obtained and reviewed and were then sent for validation to the scientific societies. To reduce waiting times to less than 30 days, a procedure of periodic patient monitoring was established, with allocation of tasks to all the parties involved. Comparison of the mean waiting times before and after the implantation of periodic monitoring showed that this procedure reduced the mean waiting time by 55.7%. The mean waiting time was reduced in all the surgical specialities except one. In almost all of the surgical specialities, the procedure established reduced the number of patients on the waiting lists and the mean waiting time to less than 30 days.