Julián Santiago-Moreno

TL;DR: Emerging data indicate that the main causes of variability are related to endocrine and ovarian factors, and so the number of studies and procedures addressing a better understanding and control of these factors may be increased in the future.

TL;DR: It is indicated that a high level of testosterone in all nestlings in a brood entails costs, at least in terms of immunity, coloration and probably growth, and that sex differences in post-natal cell-mediated immunity, and consequently in the capacity to prevent diseases, cannot be explained bysex differences in circulating testosterone levels.

TL;DR: The results show that high semen quality is associated with long day photoperiods and extreme heat or cold appear to exert a negative influence on sperm quality.

TL;DR: The present results suggest that slow cooling rates are not recommendable when using dimethylacetamide and that the medium-rate 2-step freezing method may be useful in the establishment of a germplasm bank for Spanish chicken breeds.

TL;DR: In all the ewes, the ovulatory response was related to the number of small follicles present in the ovaries at the start of treatment with exogenous FSH and to theNumber of follicles that reached > or = 4 mm in size at estrus, despite differences in the pattern of follicular development when using different commercial products.