Mid-piece length of spermatozoa in different cattle breeds and its relationship to fertility

S. K. Shahani, S. G. Revell, C. G. Argo, R. D. Murray

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Recently positive correlation has been found between oxygen consumption (Z02) in bull spermatozoa and non-return rates and concluded that an increase in Z02, characteristic of the freeze/thaw process, was possibly associated with mitochondrial membrane damage during this procedure: alternatively, sperm may be hyperactivated through the capacitation-like effects of freezing/thawing. We speculated that the morphology of spermatozoa may be associated with their rate of Z02 and fertility: for example, sperm mid-piece length where mitochondria are located. Such a relationship has not been investigated before, particularly in context of commercial cattle breeding programmes and bull fertility characteristics. Sperm biometry was performed on ejaculates obtained from 34 bulls representing six breeds: Holstein (yearlings and mature), Friesian, Belgian Blue, Aberdeen Angus, Charolais and Limousin. Five ejaculates were collected from every bull and from each sample a semen smear was fixed and stained with eosin/nigrosin: the mid-piece length of 40 sperm with normal morphology was measured in every sample. Data were analysed by breed, age and within each bull. Significant differences (p<0.01) between ejaculates in 9/34 bulls was found, as well as differences (p<0.001) between individual bulls within the same breed. The average mid-piece length for Aberdeen Angus was 13.35 μm, for Belgian Blues and Limousin around 13.8 μm and for Charolais 13.68 μm: for dairy breeds such as Holstein and Friesian it was about 13.4 μm. The mean value of mid-piece length for breed was compared with their 49 day non-return rate; a negative correlation (r = -0.53) was found in black and white dairy breeds.

Original languageEnglish
Pages (from-to)802-808
Number of pages7
JournalPakistan Journal of Biological Sciences
Volume13
Issue number16
DOIs
Publication statusPrint publication - 12 Oct 2010
Externally publishedYes

Keywords

  • Atp
  • Bulls
  • Ejaculates
  • Mitochondria
  • Non-return rates

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