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Related Concept Videos

Estimating Population Standard Deviation01:26

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When the population standard deviation is unknown and the sample size is large, the sample standard deviation s is commonly used as a point estimate of σ. However, it can sometimes under or overestimate the population standard deviation. To overcome this drawback, confidence intervals are determined to estimate population parameters and eliminate any calculation bias accurately. However, this only applies to random samples from normally distributed populations. Knowing the sample mean and...
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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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Updated: Nov 21, 2025

Author Spotlight: Improving Beef Cattle Nutrition and Production with a Focus on Feed Efficiency and Meat Quality Traits Through Advanced Biochemical and Molecular Assays
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Genetic parameter estimation for beef bull semen attributes.

Madison L Butler1, Ashley R Hartman1, Jennifer M Bormann1

  • 1Department of Animal Sciences and Industry, Kansas State University, Manhattan, KS.

Journal of Animal Science
|January 16, 2021
PubMed
Summary
This summary is machine-generated.

Improving beef bull fertility is crucial for cattle production efficiency. This study identified key factors affecting semen quality and found low to moderate heritability, suggesting potential for genetic improvement in bull fertility traits.

Keywords:
artificial inseminationfertilitygenetic correlationsheritabilitymalesemen quality

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Area of Science:

  • Animal Science
  • Reproductive Biology
  • Quantitative Genetics

Background:

  • Enhancing beef bull fertility is essential for optimizing cattle production efficiency.
  • While female fertility has seen advancements, male fertility in beef bulls remains largely unaddressed.
  • Routine semen collection data offer valuable phenotypes for genetic evaluation of bull fertility.

Purpose of the Study:

  • To identify significant fixed effects influencing beef bull fertility using data from semen collection facilities.
  • To estimate heritabilities, repeatabilities, and correlations among various beef bull semen attributes.

Main Methods:

  • Analyzed 50,624 semen collection records from 1,819 Angus bulls across two facilities.
  • Evaluated phenotypes including volume, concentration, motility, and sperm normality.
  • Incorporated fixed effects (location, day, age, collection interval) and environmental factors (cumulative comprehensive climate index).

Main Results:

  • Significant fixed effects included collection location, day within year, bull age, days since last collection, and a 75-day cumulative comprehensive climate index.
  • Heritability estimates for pre-thaw semen traits were low (e.g., 0.11 for volume, 0.09 for concentration).
  • Heritability estimates for post-thaw traits varied, with secondary abnormalities showing the highest (0.18) and primary abnormalities the lowest (0.03).

Conclusions:

  • Low to moderate heritability estimates for semen quality traits suggest potential for genetic gain.
  • Current genetic selection tools (e.g., scrotal circumference EPD) may not fully capture semen quality.
  • Development of new tools is recommended to augment existing selection methods for improved beef bull fertility.