Assessment of sperm morphology in zebu bulls, under field conditions in the tropics

Reproduction in Domestic Animals = Zuchthygiene
J Chacón

Abstract

Sperm morphology was studied in 302 extensively managed Zebu bulls (aged 1.5-9 years), classified as sound (n=166) or unsound (n=136) for breeding, under field conditions in the dry tropics of Costa Rica. Single semen samples were collected by electro-ejaculation and fixed in formol-saline solution immediately after collection. Sperm morphology was determined in the field on wet smears using a microscope equipped with phase-contrast optics, and further determined in the laboratory on air-dried smears stained with carbol-fuchsin. The frequencies of sperm abnormalities (such as abnormal acrosome, head, neck, mid-piece, tail, and presence of cytoplasmic droplets) were recorded as a percentage of the total number of counted spermatozoa (400 cells). Zebu bulls considered unsound for breeding showed a higher mean prevalence (p < 0.05) of knobbed acrosomes (4.0 versus 0.9%), head defects [specifically, nuclear invaginations and heads with abnormal shapes and sizes (27.6 versus 4.0%)], abnormal tails (11.2 versus 4.7%), and proximal droplets (8.4 versus 1.6%), compared with bulls considered sound for breeding. In these latter bulls, the abnormality most commonly seen was the presence of single bent tails with an entrapped cytoplasmic d...Continue Reading

References

Jul 1, 1976·Journal of Reproduction and Fertility·E LinfordD L Stewart
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Mar 29, 2000·Theriogenology·J ChacónH Rodríguez-Martínez

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Citations

Mar 1, 2014·Animal Reproduction Science·Alma Álvarez-GuerreroNorma Moreno-Mendoza
May 12, 2007·Journal of Veterinary Medicine. A, Physiology, Pathology, Clinical Medicine·S KoonjaenakH Rodriguez-Martinez
May 18, 2007·Reproduction in Domestic Animals = Zuchthygiene·E Axnér, C Linde Forsberg
Jul 16, 2009·Reproduction in Domestic Animals = Zuchthygiene·J Chacón, A Berrocal
Jul 29, 2020·Nature Human Behaviour·Uri SimonsohnLeif D Nelson
Feb 18, 2019·Theriogenology·Eduarda EscobarFrancielli Weber Santos Cibin

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