Prevalence and Morphological Appearance of Sperm Nuclear Defects Using Feulgen Reaction in Beef Bulls.

The objective of this study was to assess the prevalence and compare the morphological aspects of sperm nuclei abnormalities in beef bulls submitted to breeding soundness evaluation (BSE). Semen samples were collected by electroejaculation from 649 beef bulls (Bos indicus, n = 515 and Bos indicus × Bos taurus crossbreed, n = 134) ranging from 2 to 12 years of age. Following a clinical evaluation and semen assessment, a slide was prepared with fresh semen and stained by using the Feulgen-stain for the purpose of evaluating sperm and nuclear morphology.

Transcriptomic analysis of heifers according to antral follicle count.

While antral follicle count (AFC) has been associated with higher pregnancy rates, at present, our understanding of it as a reproductive parameter remains incomplete. This study aimed to characterize gene expression profile of oocytes from crossbred Bos taurus x Bos indicus heifers with high and low AFCs. Crossbred Nelore-Angus heifers (n = 50) with a mean (SD) age of 9.

A Novel Compound Heterozygous Genotype of the WDR73 Gene Associated With a Psychomotor Retardation Syndrome Without Cerebellar Atrophy and Other CNS Structural Abnormalities.

A novel compound heterozygous genotype of the WDR73 gene associated with a psychomotor retardation syndrome without cerebellar atrophy and other CNS structural abnormalities.